Podcasts about khz

Many thanks to SRAA contributor Tom Laskowski, for sharing the following recording and notes:Broadcaster: Radio AustraliaDate of recording: July 27, 1986Starting time: 0300Frequency: 17.795 MHzRX location: South Bend, IndianaReceiver and antenna: Sony ICF 2001Notes: Here is a recording of Radio Australia's DX program called Talkback from July 27, 1986. I believe this was recorded around 0300 UT on 17795 kHz when Australia used to come in well in the evenings here.Some of the program highlights are:Review of the 1986 ANARC Convention, which was held in Montreal, Canada. Hosted by Radio Canada International, it attracted over 200 attendees. New Zealand's Arthur Cushen was the Guest of Honor for the event.

rWotD Episode 2934: KATD Welcome to Random Wiki of the Day, your journey through Wikipedia's vast and varied content, one random article at a time.The random article for Friday, 16 May 2025, is KATD.KATD (990 AM) is a radio station that rebroadcasts San Francisco station KIQI. Licensed to Pittsburg, California, the station serves the Sacramento Valley. The station is currently owned by Multicultural Broadcasting. KATD is partnered with the Oakland Athletics and broadcasts night and weekend home games.990 AM is a Canadian clear-channel frequency. KATD protects the nighttime signal of CBW in Winnipeg by reducing power and using a signal nulled to the northeast. CBW and CBY are the Class A stations on 990 kHz.This recording reflects the Wikipedia text as of 01:16 UTC on Friday, 16 May 2025.For the full current version of the article, see KATD on Wikipedia.This podcast uses content from Wikipedia under the Creative Commons Attribution-ShareAlike License.Visit our archives at wikioftheday.com and subscribe to stay updated on new episodes.Follow us on Mastodon at @wikioftheday@masto.ai.Also check out Curmudgeon's Corner, a current events podcast.Until next time, I'm neural Joanna.

This week's EYE ON NPI is a follow up to one we did a few years ago on the similarly-named BQ25792 (https://blog.adafruit.com/2021/05/06/eye-on-npi-ti-bq25792-i2c-controlled-1-4-cell-5a-buck-boost-battery-charger-eyeonnpi-adafruit-digikey-adafruit-digikey-txinstruments/). The BQ25798 (https://www.digikey.com/short/vnr279pz) builds on the '92 by adding selectable dual inputs and true MPPT solar support. This chip is inexpensive, powerful and can handle almost any battery and power source matching you desire. Let's look at some specifications: High power density, high integration buck-boost charger for 1-4 cell batteries supporting USB PD 3.0 profile – Integrates four switching MOSFETs, BATFET – Integrates input and charging current sensing Highly efficient – 750-kHz or 1.5-MHz switching frequencies – 5-A charging current with 10-mA resolution 96.5% efficient: 16-V battery at 3A from 20V Supports a wide range of input sources Autonomously sampled open circuit voltage (VOC) maximum power point tracking (MPPT) for charging from a photovoltaic panel – 3.6-V to 24-V wide input operating voltage range with 30-V absolute maximum rating – Detects USB BC1.2, HVDCP and non-standard adapters Dual-input power mux controller (optional) Narrow voltage DC (NVDC) power path Backup Mode with Ultra-fast switchover to adjustable voltage Powers USB port from battery (USB OTG) – 2.8-V to 22-V OTG output voltage with 10-mV resolution to support USB-PD PPS – OTG output current regulation up to 3.32 A with 40-mA resolution Flexible autonomous and I2C mode for optimal system performance Integrated 16-bit ADC for voltage, current, and temperature monitoring Like the '92, the BQ25798 (https://www.digikey.com/short/vnr279pz) supports any size battery. We have lots of battery packs in the Adafruit shop, and in particular we use 1S batteries – if there are more batteries, they are wired in series. But there's lot of folks who are building robotics that require higher voltages, so they have 2S, 3S, or 4S batteries. This charger can handle any of 'em, and you can configure the battery pack size using a simple resistor on the PROG port. In this case it also allows the chip to run in 'standalone' mode without the use of I2C to configure. The biggest improvement you get with the BQ25798 (https://www.digikey.com/short/vnr279pz) is true solar MPPT support. The BQ25792 had VINDPM and IINDPM – the ability to track the input voltage to make sure it is not drooping from overdraw. While this lets you get pretty-close-to-MPPT it isn't true power-point-tracking which requires perturbation around the voltage to adjust as light and temperature affect the solar panel's efficiency. The '98 does this 'right' and even has a K Factor adjustment register - you can tweak this to get the best results based on different weather/temperature (https://www.ti.com/video/6287049638001)- or stick to the default value for good results. Another new feature is 'selectable dual-inputs' what this means if you can set up two power inputs - say DC plug and Solar - and then have the chip switch between them. This is particularly useful because you can't just use two OR'ing diodes to select the power source: the solar panel might have a higher initial open-voltage but can't supply as much current as a DC plug. I2C lets you select which one is priority! The BQ25798 (https://www.digikey.com/short/vnr279pz) also has many of the cool features we liked in the BQ25792: On-The-Go mode where you can turn the buck-boost around and have it generate a variable voltage output, say 5V for powering other USB devices. Another thing that works is powering over USB where you can have the BQ negotiate 'high voltage' support from USB 3 ports. Note that this isn't USB Type C power negotiation, for that you'll want to get a separate USB Type C PD negotiation chip like the TPS25750D (https://www.tij.co.jp/jp/lit/ml/slpp103/slpp103.pdf)...we're hoping there's a future version with PD built in! There's also a built in 16-bit ADC that you can use to monitor various voltages and current draw. While you can charge the battery in 'standalone' mode - you really do need I2C to get the best performance and capabilities. Thankfully there's not a huge number of registers, and SDA/SCL can be 3 or 5V logic signals so you should be able to get it working on anything from an ATmega328 to a Raspberry Pi. We like the high integration: you really only need a few passives and an inductor to get a fantastic all-in-one charger for any lithium ion battery pack. If you're intrigued and would like more information, you've come to the right place! DigiKey has the BQ25798 (https://www.digikey.com/short/vnr279pz) in stock right now for immediate shipment. Order today and you can start designing your solar-powered products of the future by tomorrow afternoon.

Sumario Informe Enigma Dirige y Presenta: Jorge Ríos Escúchanos cada viernes de 23:00h a 01:00h en directo en Radio Platja d'Aro. Síguenos a través de nuestras redes sociales o contacta con nosotros en el siguiente correo electrónico: informeenigmapodcast@gmail.com Contacto Yolanda Martínez: 647552954 Esta semana en el programa, nos sumergimos en tres temas fascinantes que cruzan los límites de lo conocido y lo inexplicable, explorando desde los misterios ocultos en las frecuencias de radio, hasta los secretos más profundos del universo energético. La UVB 76, la emisora de radio fantasma más importante y enigmática del mundo, nos ha dejado sus últimos mensajes, una serie de señales crípticas que siguen sin explicación clara. Con Hugo Fernández, nos adentramos en los misterios detrás de la frecuencia 4625 kHz, donde la radio transmite extraños zumbidos, códigos y mensajes enigmáticos, dejando a la comunidad de oyentes y expertos en vilo. ¿Qué hay detrás de estos susurros? ¿Por qué siguen emitiendo después de más de 40 años sin descanso? Además, hablamos del apagón eléctrico que sacudió España, un evento que paralizó el país durante horas. ¿Qué causó este colapso energético masivo? Javier del Valle, nos compartirá su análisis detallado, y aunque muchos apuntan a fallos técnicos, quizá podrá haber algo mucho más profundo y oculto detrás de esta crisis. ¿Fue solo un accidente? Y para cerrar, nos adentramos en el campo de la mente y el poder personal con Yolanda Martínez, quien nos reveló los secretos de la Ley de la Atracción. Un concepto que muchos han escuchado, pero pocos entienden en su profundidad. Yolanda explicó cómo nuestras creencias, emociones y pensamientos pueden atraer lo que deseamos, y cómo aplicar correctamente esta ley para transformar nuestra realidad. ¿Es la Ley de la Atracción realmente un poder universal, o es solo una cuestión de psicología positiva? Tres temas que parecen distantes entre sí, pero todos comparten una cosa: nos invitan a cuestionar la realidad tal y como la conocemos. No te pierdas este programa, donde los límites entre lo real y lo sobrenatural se desdibujan ante tus ojos.

Foundations of Amateur Radio Since becoming a licensed amateur in 2010, I have spent a good amount of time putting together my thoughts on a weekly basis about the hobby and the community surrounding amateur radio. As you might know, my interest is eclectic, some might say random, but by enlarge, I go where the unicorns appear. Over a year ago I mentioned in passing a community called HamSCI. The label on the box is "Ham Radio Science Citizen Investigation", which gives you a sense of what this is all about. It was started by amateur radio scientists who study upper atmospheric and space physics. More formally, the HamSCI mission is the "Continuation and extension of the amateur's proven ability to contribute to the advancement of the radio art." If you visit the hamsci.org website, and you should, you'll discover dozens of universities and around 1,300 people, many of whom are licensed radio amateurs, who are asking questions and discovering answers that matter to more than just our amateur community. For the eighth time the HamSCI community held an annual "workshop", really, an opportunity to get together and share ideas, in person and across the internet, a conference by any other name. Under the banner theme of "HamSCI's Big Year", over two days, 56 people representing 27 different organisations across 61 sessions, tutorials, discussions, tours, posters and demonstrations, explored topics all over our hobby, from the Personal Space Weather Network, capable of making ground based measurements of the space environment, to the Whistler Catcher Pi, a project to record the VLF spectrum to 48 kHz using a Raspberry Pi. You'll find research into HF antennas for the DASI or Distributed Array of Small Instruments project and associated NSF grants, exploring measurements of HF and VLF, combined with GPS and magnetometer across 20 to 30 stations. There's discussions on how to explore Geospace Data, such as information coming from the Personal Space Weather Station network, or PSWS, using the OpenSpace project and dealing with the challenges of visualising across a wide scale, all the way up to the entire known universe. Did I mention that there's work underway to add PSWS compatible receivers to Antarctica? There reports on observations and modelling of the ionospheric effects of the April 2024 solar eclipse QSO party, including Doppler radio, HF time differences, and Medium Wave signal enhancements, not to mention planning and promoting future meteor scatter QSO parties. There's, post-sunset sporadic-F propagation, large scale travelling ionospheric disturbances, GPS disciplined beacons, the physical nature of sporadic-E propagation and plenty more. As you might have heard me say at one time or another, the difference between fiddling and science is writing it down. It means that you'll find every session has accompanying documentation, charts, graphics and scientific papers. Remember, there's eight years of reading to catch up with, or learn from, or play with. The publications and presentations section on the hamsci.org website currently has 526 different entries. You might not be interested in the impact of radio wave and GPS scintillation, or rapid fluctuation in strength, caused during the G5 geomagnetic storm that occurred on the 10th of May 2024, or a statistical study of ion temperature anistropy using AMISR, or Advanced Modular Incoherent Scatter Radar data .. or you might. In case you're curious, "anistropy" is the property of being directionally dependent, in other words, it matters in which direction you measure, which might have some relevance to you if you consider that we think of the ionosphere and radio paths being reciprocal. If it reminds you of isotropy, that's because they're opposites. The point being, that amateur radio is a great many things to different people. If you're a scientist, budding, graduate or tenured, there's a home for you within this amazing hobby. I'm Onno VK6FLAB

BBC World Service in English received in Europe on shortwave frequency of 9410 kHz at 0504 GMT May 9, 2025 using domestic 40-years old shortwave receiver "JS" (with double frequency conversion design) running on bateries. Antenna: 5 meter wire outdoor put on trees. Recorded using old SONY cassette recorder TCM 500V model.The transmission recorded originated from the BBC Atlantic Relay Station in Ascension Island The station made its first shortwave radio transmission on July 3rd, 1966

#FrecuenciaAlDía - Rep. Dominicana – La Historia de Radio Cima 100 FM. El 20 de abril de 1979, empezaron a escucharse las transmisiones de prueba de la estación capitalina Radio Cima (HIVR), en los 100.5 MHz, propiedad del agrimensor Roberto Vargas Mejía, cuyos estudios y transmisor, se ubicaban en la avenida Francia a esquina Rosa Duarte. La inauguración se produjo el siguiente mes de mayo. A mediados de septiembre de 1992, Radio Cima, comenzó sus emisiones paralelas en la frecuencia de 4,960 KHz, banda de 60 metros, en onda corta. El Informe con Dino Bloise. Participaron: Francisco Oviedo – Otto Oppenheimer - Eusebio Sánchez - Luís G. Loyola – Francisco Páez – Magaly Fuentes - Espectro Noticioso - Víctor H. González. ► Síguenos en Programas DX: http://bit.ly/1A0x4Xq [No. 931. Publicado Mayo 9, 2025 - 05:00 UTC] #FrecuenciaAlDía #DinoBloise #TV #teléfono #YouTube #radio #radioafición #AmateurRadio #dx #diexismo #cb #TecnologíaAvanzada #InnovaciónTecnológica #GadgetsDelFuturo #ÚltimaTecnología #ReviewsTecnológicos #NoticiasTecnológicas #TendenciasTecnológicas #GadgetsYGizmos #MundoDigital #SmartTech #TechUpdates #GeekLife #GamerTech #TV #LifeHacksTecnológicos #CienciaYTecnología #TechUpdates #WiFi #GPT #InteligenciaArtificial #OpenAI #Tecnología #Robótica #FuturoTech #prorobots #robots #robots #technology #futuretechnology #innovation #innovation2025 #robotics

rWotD Episode 2926: Goldbeat Welcome to Random Wiki of the Day, your journey through Wikipedia's vast and varied content, one random article at a time.The random article for Thursday, 8 May 2025, is Goldbeat.Goldbeat was an AM radio station broadcasting on 828 kHz in Cookstown, Northern Ireland. It was launched in 1995 as Townland Radio, but was purchased in 1997 by media tycoon Owen Oyston who had already bought and relaunched Belfast Community Radio in 1996 (now Belfast CityBeat). The Oyston group relaunched Townland Radio as Goldbeat 828, but the station folded in 1999 along with sister station Heartbeat 1521 AM (formally Radio 1521) in Craigavon. Both AM licences were handed back to the then UK regulator The Radio Authority (now Ofcom). At the time only one other radio licence in the UK had ever been handed back to the regulator.After years of campaigning by locals for the re-advertising of a radio licence for Mid-Ulster, Ofcom awarded an FM licence for the area to Belfast CityBeat (now owned by CN group) in 2002. Belfast CityBeat launched Mid FM from the same premises previously occupied by Townland Radio/Goldbeat at Park Avenue, Cookstown in County Tyrone. In 2006 Belfast Citybeat sold their majority stake in Mid FM to Northern Media, owners of 7FM in Ballymena.Mid FM was rebranded to 6FM in 2006 and changed name again to Q106/7 FM in November 2011.This recording reflects the Wikipedia text as of 00:42 UTC on Thursday, 8 May 2025.For the full current version of the article, see Goldbeat on Wikipedia.This podcast uses content from Wikipedia under the Creative Commons Attribution-ShareAlike License.Visit our archives at wikioftheday.com and subscribe to stay updated on new episodes.Follow us on Mastodon at @wikioftheday@masto.ai.Also check out Curmudgeon's Corner, a current events podcast.Until next time, I'm generative Olivia.

Many thanks to SRAA contributor, Ian Pillar, who shares the following recording of Radio Symban made on April 26, 2025 on 2368 kHz at 06:10 UTC via a Kiwi SDR and loop antenna in New South Whales, Australia. Ian notes:Notes: Low Power Radio Symban Back On Shortwave From Sydney NSW Radio Symban Also Broadcast On FM With 24-hour Greek Programming. Some interesting photos found here.

I read from flysch to foal.     I'm no engineer so the flywheel is confusing. https://en.wikipedia.org/wiki/Flywheel     Compared to AM radio, FM has higher quality sound and travels a shorter distance. And the radio wave frequencies are much higher. AM frequencies range from about 535 to 1700 kHz (535,000 to 1,700,000 Hz) and FM is 88 to 108 MHz (88,000,000 to 108,000,000 Hz). FM waves vibrate faster than AM.  https://en.wikipedia.org/wiki/FM_broadcasting https://en.wikipedia.org/wiki/AM_broadcasting     The formula for the f-number is actually very simple, but you'll probably never have to use it. f-number = focal length / diameter of the aperture I also can never remember how the focal length is measure on a lens, but the shorter ones are wide angle lenses and the longer ones are telephoto lenses.  https://en.wikipedia.org/wiki/F-number https://en.wikipedia.org/wiki/Focal_length     The word of the episode is "fly speck".     Use my special link https://zen.ai/thedictionary to save 30% off your first month of any Zencastr paid plan.    Create your podcast today! #madeonzencastr     Theme music from Tom Maslowski https://zestysol.com/     Merchandising! https://www.teepublic.com/user/spejampar     "The Dictionary - Letter A" on YouTube "The Dictionary - Letter B" on YouTube "The Dictionary - Letter C" on YouTube "The Dictionary - Letter D" on YouTube "The Dictionary - Letter E" on YouTube "The Dictionary - Letter F" on YouTube     Featured in a Top 10 Dictionary Podcasts list! https://blog.feedspot.com/dictionary_podcasts/     Backwards Talking on YouTube: https://www.youtube.com/playlist?list=PLmIujMwEDbgZUexyR90jaTEEVmAYcCzuq     https://linktr.ee/spejampar dictionarypod@gmail.com https://www.facebook.com/thedictionarypod/ https://www.threads.net/@dictionarypod https://twitter.com/dictionarypod https://www.instagram.com/dictionarypod/ https://www.patreon.com/spejampar https://www.tiktok.com/@spejampar 917-727-5757

This show has been flagged as Clean by the host. Hi all! Topics Topic 1: Hello, my name is Antoine. Topic 2: I listened to you! a) Comment from Archer72: "[...] Audio setups are *definitely* of interest to hackers :)" Link: https://hackerpublicradio.org/eps/hpr4325/index.html#comment_4278 b) From hpr4351 :: HPR Community News for March 2025 (on the show) Something like: 'I'm not going to read your (long) comments, give a show on it'. Sorry for making you read my comments, dear HPR Janitors! (Specially you, good-voice Sgoti) Link: https://hackerpublicradio.org/eps/hpr4351/index.html Topic 3: My audio setup (Also you can see written on a commentary of mine on the link on Topic 2 a). Topic 4: My audio editing (when I do) With examples. * On the sibilance ("sss") example, the adjustment settings for the to-be-better fragment was an agressive cut of -7.4 dB on frequency 5.8 kHz (for advanced curiosity: Q 4.73, threshold -36.3 dB, ratio 3.8:1). Did it only with some testing, and knowing that sibilance normally is at about 6 kHz (when it happens, because here the dynamic microphone ended up not capturing too much of it). Topic 5: I'm in a new working time If you can, do a word of prayer to God in favour of me. If anything I said "that is better" is, actually, worse, don't worry thinking you are perceiving it wrongly, it's just that I'm not a professional and can have made it wrong. Or it's only a matter of taste, it's fine also; the ideas are there, and I welcome your participation too. Thank you! Credit of music I decided to use on the example after normalizing and compressing a fragment is from: EvanBoyerman: " Hopeful Piano/String Cinematic Ambience Drama Background Music ", CC-BY 4.0, link: https://freesound.org/people/EvanBoyerman/sounds/798705/ Provide feedback on this episode.

Many thanks to SRAA contributor, Dan Greenall, who shares the following recording and notes:Broadcaster: Radio Tahiti 1971Frequency: 15.170MHzReception location: Ancaster, Ontario, CanadaReceiver and antenna: Hallicrafters S-52 using a longwire antennaNotes: Radio Tahiti was a very popular station with shortwave listeners back in the 1970's. Their island type music was very listenable and the station often put a decent signal into eastern North America with their 20 kw of power on 15170 kHz. The late Dr. Richard E. Wood reported in the Communications Handbook for 1972 that this frequency was activated on April 10, 1971. I made this recording of their sign off announcements in French, closing song and La Marseillaise sometime in 1971.

Darling Downs Radio Club news. Coming up on 10 May we're running our inaugural annual club Foxhunt and family day. The actual hunt will start at 1030 and will run no further than a 15 km radius from the starting location at Peacehaven Park in Highfields, just north of Toowoomba. The Fox frequency will be 145.650 kHz, and the hunt is going to be staged so that experienced hands and rank beginners can both have fun. Doesn't matter where you are in the state; we'd love you to come and join us - we already know of a few distant households who will come to stay in Toowoomba overnight, and the aim is to be as social as possible. The hunt will start from Peacehaven Botanic Park on Kuhls Road in Highfields and is also the location for the post-hunt BBQ. Tons of parking, easy access, wet-weather protection, and great family amenities. Our next club tech session is on Monday, 12 May, when Simon VK4TSC will join us from the Brisbane WICEN group to guide us on the WICEN state of mind, and talk about the Hip Pocket Challenge Horse enduro, which has been rescheduled for Southbrook on 28 June. Hello, I'm Geoff Emery, VK4ZPP, and I've been thinking. A comment about the quality of the image on one of the free-to-air TV channels started me thinking about progress. Compare the sound reproduction of a portable cassette player to a digital machine, and you can appreciate the way things have improved. With television, the images that we get when archived material is shown are appalling compared to the images we saw on the screens in our living rooms 30 or more years ago. Just as the digital TV was a vast improvement over the old PAL services, the newer HD is another jump ahead in home entertainment. This brought me around to thinking about the radios that I have used in the past. Budgets being what they are on the domestic front, most of my rigs have been 2 nd hand, so already showing their ages by the time I got to use them. From hybrid to fully solid-state HF radios, there seems not to be much difference in performance. For someone who started listening on the large console receiver dominating the lounge room and then went through home-made and commercial simple sets, it was amazing at the time what the multiband and multimode brand-name transceiver could do. Still, as most of us will have experienced, these older rigs had their own characteristics which made them good, but at times finicky and annoying on reception. They are perfectly usable, but you have to tolerate overlapping signals and front-end overload, from time to time, as they represent the technology of the period of manufacture. More recently, I was able to purchase an Asian SDR as my introduction to the multicoloured scrolling display. What a great little rig that has yet to do duty out in the rig. It is versatile and every bit a good as the best shortwave rig that I have owned. Over the past couple of weeks, I have been fortunate to use a full-blown 100W SDR transceiver made by a major Japanese company. Before receiving this piece of kit, I watched several online videos and took note of what users and reviewers had to say. I must say that I have yet to put a signal on air, and I have to fight the electrical noise which envelopes this QTH, but the received signals and sensitivity just blow me away. I am using a shortened centre-loaded vertical antenna in a poor location, but pulling voices out of nothing is amazing. There can be no trace on the display, and the audio is readable. There can be close-by signals without heterodyning, and I have yet to find out how this unit handles a really close-by and strong signal. I suspect it will use the AGC to the best advantage and still provide a clean signal through the speaker. I am impressed with the improvements that digital technology is providing now, and I hope we all appreciate the engineering developments for our recreation. I'm Geoff Emery, VK4ZPP, and that's what I think. How about you?

Welcome to today's podcast, where we explore the dynamic world of Industrial MCUs with Marijana Vukicevic, Marketing Director for Industrial MCU at Infineon.Today's episode is brought to you by our sponsor, Infineon.Today, it's a pleasure to have a special guest, Marijana Vukicevic, joining us to discuss the evolving role of microcontrollers (MCUs) in high-performance motor control and power conversion applications.As industries shift from analog to digital power systems, MCUs are at the heart of enabling higher efficiency, faster switching, and real-time processing—critical for applications like robotics, industrial automation, and high-density power supplies for data centers. With switching frequencies increasing from 200 kHz to 600 kHz and beyond, the demand for ultra-fast, well-architected microcontrollers is greater than ever.In this episode, we'll explore how Infineon's MCUs are addressing these challenges, particularly in robotics and AI-powered motor control. We'll also dive into the role of GaN-based power systems, the increasing power demands of server racks, and what the future of MCU architecture looks like for next-generation embedded systems.

Many thanks to SRAA contributor Paul Walker, who shares the following recording of The Voice of America made on January 14, 2025 at 0355 UTC on 9775 kHz. The reception location was McGrath, Alaska:

Conférence au CESQ à Strasbourg. Le 6 mars lors de la « quantum week », le CESQ (European Center for Quantum Sciences), un événement coorganisé par la startup QPerfect et l'Université de Strasbourg. Les premiers jours étaient dédiés à l'inauguration du CESQ et à des journées grand public.Interventions d'Olivier  :« discover » (mes slides)APS Physics Global Summit à AnaheimLa startup irlandaise Equal1 se faisait remarquer en présentant UnityQ-1 un premier ordinateur quantique complet avec des qubits silicium tenant dans un simple rack. Equal1 Demonstrates Advances in Silicon-Based Quantum Computing by Matt Swayne, The Quantum Insider, December 2024. Nvidia Quantum Developer Day à San Francisco.Cette journée de conférence avait lieu pendant l'APS Global Summit, mais à San Francisco. Elle a été marquée par trois panels animés par le CEO de Nvidia, Jensen Huang.  Alice&Bob Alice&Bob comprime ses chats !Enhancing dissipative cat qubit protection by squeezing by Rémi Rousseau, Diego Ruiz, Raphaël Lescanne, Zaki Leghtas, Sébastien Jezouin, Anil Murani et al, arXiv, February 2025 (26 pages). Pasqal Des évolutions d'un partenariat technologique avec KAIST en Corée du Sud. Il s'agit de recherches conjointes sur le contrôle des atomes. Advancing Quantum Computing with Pasqal and KAIST, by Pasqal, March 2025. Korea Advanced Institute of Science and Technology. Une machine de Pasqal est maintenant disponible sur Microsoft Azure.Pasqal Expands Access to Quantum Computing Capabilities by Pasqal, March 2025. Une commande d'une machine à 140 qubits pour EuroHPC en Italie pour CINECA à Bologne. EuroHPC Selects Pasqal to Build 140-Qubit Neutral Atom Quantum Simulator in Italy, Upgrade Planned for 2027 by Cierra Choucair, The Quantum Insider, March 2025. Son prix ? 13M€. Une nouvelle organisation. Wasiq Bokhari devient Executive Chairman. Loic Henriet devient CEO. Georges-Olivier Reymond devient Chief Strategic Alliances Officer. Pasqal Announces a New Management Structure with the Appointment of Loïc Henriet as CEO and Wasiq Bokhari as Executive Chairman, Mars 2025. Travaux sur le benchmarking et l'estimation de ressources pour obtenir un avantage quantique dans la résolution d'un problème de combinatoire de type MIS (maximum independent set). “Based on extended classical benchmarks at larger problem sizes, we estimate that scaling up to a thousand atoms with a 1 kHz repetition rate is a necessary step toward demonstrating a computational advantage with quantum methods”. Decrypting Pasqal recent research on solving optimization problems by Marie Wakim, Pasqal, March 2025 et Identifying hard native instances for the maximum independent set problem on neutral atoms quantum processors by Pierre Cazals, Constantin Dalyac et al, arXiv, February 2025 (11 pages).  Quobly et Bgene genetics L'annonce en mars d'un partenariat applicatif avec Bgene Genetics, une startup biotech de Grenoble dirigée par Marie-Gabrielle Jouan.  ChipironPublication d'un livre blanc ou blueprint scientifique de 35 pages sur la création d'une IRM portable à bas champ (1 mT) et avec une détection plus sensible avec un magnétomètre de précision à base de SQUID (capteurs supraconducteurs) en lieu et place des antennes des IRM habituelles qui détectent des radiofréquences autour de 60 MHz avec des inductances en cuivre. Au lieu de 1 à 4 Tesla dans les IRM d'hopitaux. Dans Chipiron - High quality 1 mT MRI by Zineb Belkacemi, Dimitri Labat et al, March 2025 (35 pages).  Et au passage, cela consommera beaucoup moins d'énergie. Appareil qui tiendrait dans un rack 5U. WelinqWelinq sort du prototypage et lance sa première mémoire quantique pour l'interconnexion d'ordinateurs quantiques. Elle occupe un rack complet. Welinq Launches Its Storage Solution for Quantum Computing Scale-Out by Welinq, March 2025. ColibriTDAlgorithme variationnel de résolution d'un type d'équation aux dérivées partielles (PDE), l'équation de Burger, testé sur 50 qubits d'un QPU IBM Heron de 156 qubits, dans un régime un peu en-dessous de l'avantage quantique. ColibriTD announces H-DES for solving Differential Equations on IBM Quantum Computers, Mars 2025.Solving Partial Differential Equations on IBM Quantum Processors with a Variational Quantum Algorithm, ColibriTD, March 2025 (9 pages).H-DES: a Quantum-Classical Hybrid Differential Equation Solver by Hamza Jaffali, Jonas Bastos de Araujo, Nadia Milazzo, Marta Reina, Henri de Boutray, Karla Baumann, and Frédéric Holweck, ColibriTD, arXiv, October 2024 (40 pages). IBM·       Un état intriqué GHZ de grande taille avec 120 qubits, un record après celui de Quantinuum de 50 qubits réalisé en 2024. Il a été réalisé avec le concours de Simon Martiel, un chercheur d'IBM ex Atos, basé à Bordeaux. Q-CTRL avait réalisé un GHZ de 75 qubits avec de la correction d'erreurs.Achieving computational gains with quantum error correction primitives: Generation of long-range entanglement enhanced by error detection by Haoran Liao, Michael J. Biercuk, Yuval Baum et al, arXiv, November 2024 (8 pages).·       Un QPU Heron System Two sera installé en Espagne d'ici la fin 2025 au Pays Basque. C'est le second en Europe après l'Allemagne.·       Un papier sur la correction d'erreur de portes non-Clifford...

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Jepler spent a bunch of time this week working on getting audio working on the pico-umac port https://github.com/jepler/pico-mac/tree/rp2350-fruitjam to Fruit Jam https://www.adafruit.com/product/6200 . Audio on the hardware we're emulating is pretty straightforward: every scanline of the video generator also pops out one byte of PWM data. We have 370 horizontal lines—352 visible and 18 during the vsync—and a 60.15 Hz refresh rate for 22.255 KHz audio approximately. That data is written to $1FD00 http://www.mac.linux-m68k.org/devel/plushw.php . That data is being piped over I2S to the MAX98357 https://www.adafruit.com/product/3006 and to a speaker for now. So, of course, the first thing we have to try out is Dark Castle https://archive.org/details/mac_DarkCastle_1_2 : famous for great audio and being a surprisingly hard game to play! The audio sounds really good though :) Visit the Adafruit shop online - http://www.adafruit.com ----------------------------------------- LIVE CHAT IS HERE! http://adafru.it/discord Subscribe to Adafruit on YouTube: http://adafru.it/subscribe New tutorials on the Adafruit Learning System: http://learn.adafruit.com/ ----------------------------------------- #marchintosh #apple #diy

This week's EYE ON NPI is trendy and buzzy, it's Boréas Technologies' BOS1931 High-Efficiency Piezo Driver (https://www.digikey.com/en/product-highlight/b/boreas/bos1931-high-efficiency-piezo-driver). This chip is a compact way to add powerful high-voltage piezo drive to any product, combining three chips: power supply, waveform generator and driver. With a complete I2C/I3C interface that you can connect to any microcontroller/processor it's the most advanced all-in-one piezo driver we've seen! Piezo (https://en.wikipedia.org/wiki/Piezoelectricity) discs are multi-use devices that convert mechanical movement to electrical signal, and vice-versa. They're most often seen as electrical-to-mechanical converters such as piezo beepers (https://en.wikipedia.org/wiki/Piezoelectric_speaker) where an AC signal, usually 3 to 6V peak-to-peak square wave, is applied across the disk. The frequency of the wave is translated into a sound frequency. It doesn't have the same fidelity as a magnetic speaker but its much thinner, less expensive for the component and driving circuitry, and for 2 to 4 KHz beeps it's just fine. Piezos can also be used the opposite way, where mechanical stress on the crystal is translated into an electrical signal. In this way it can be used as a switch or force sensor (https://en.wikipedia.org/wiki/Piezoelectric_sensor), again usually a few microamperes' worth of current is generated. For these basic uses, your standard microcontroller pin, or at best an H-Bridge will work just fine: you can drive piezo's differentially to get more Vpp across the disc but essentially we're still talking about only a few Volts. There are some times when you want to make a piezo really 'loud' - that is, putting 100+ Volts across the crystal to generate a big mechanical response. This is often not for audible use cases, after all if you wanted to do that you'd just use a magnetic speaker (https://www.adafruit.com/product/1732) that can get to many many Watts of output efficiently. FYI there's two variants of the chip: the BOS1931 (https://www.digikey.com/short/w9tz9tbj) and the BOS1921 (https://www.digikey.com/short/nnb0r29r). The '31 can only do piezo driving. The '21 can do sensing as well as driving, so it can be used for force-feedback products. In this particular EYE ON NPI we'll just be chatting about the driving capabilities of both. So, while we can do basic sensing/beeping with a few Volts - when we want to have significant motion for blasting sonar or moving fluid around we can only increase the movement by increasing the peak-to-peak voltage. Each piezo you buy will have a voltage rating - and you will need a boost converter to generate that peak-to-peak. For the BOS19 series of chips, you can get +-95V so 190Vpp max, which will drive any piezo you find, and you only need 3~5V input thanks to a built-in DC/DC boost converter. Boréas didn't stop there. Not only do you get a booster, but also a full waveform manager with I2C/I3C control. You can can fill up a FIFO buffer with waveform bytes to generate different shapes. There's a sine generator you can control with an envelope creator. Or, you can piece together waveform shapes for different pump/haptic behavior, giving you the customizability of a byte-wise waveform generator with the simplicity of a sine generator. They even have a Haptics Studio' to help you craft the waveform you want (https://www.boreas.ca/pages/haptic-studio). The BOS1931 (https://www.digikey.com/short/w9tz9tbj) and the BOS1921 (https://www.digikey.com/short/nnb0r29r) come in two packages: an easy-to-layout-and-solder QFN and a tiny-and-advanced BGA. Both have the same core so just pick whether you need simplicity or small size. Since its a pretty serious boost converter and driver - the piezo connects directly to the output pins - you'll need to watch your layout. Check the datasheet for their recommended setup to make sure you don't have excessive power loss or EMI. IF you want to get started quickly, the BOS1921-KIT-B01 (https://www.digikey.com/short/v9hn8mcd) evaluation board will let you use their configuration software to quickly determine how your piezo actuator or sensor response to the waveform generator and booster before you start laying out the components on a prototype PCB. If you have some serious piezo-ing you need to get moving, the Boréas Technologies' BOS1931 High-Efficiency Piezo Driver (https://www.digikey.com/short/w9tz9tbj) can do everything from voltage generation, waveform shaping, and differential driving. And best of all it's in stock right now at Digi-Key for immediate shipment! Order today and DigiKey will pick and pack your order in an instant so that you can be vibin' with your fancy new piezo controller by tomorrow afternoon.

See the Sounds of Classic Mac Audio

Many thanks to SRAA contributor, Dan Greenall, who shares the following recording and notes:Broadcaster: Maritime radio HLS Seoul KoreaDate of recording: October 31, 1998Frequency: 8.725 MHzReception location: Coe Hill, Ontario, CanadaReceiver and antenna: Panasonic RF-3100 and longwire antennaMode: Single Side BandNotes: Maritime radiotelephone station HLS in Seoul, Korea continued to operate in the late 1990's on shortwave. Instead of a repeating voice mirror, this station played Beethoven's "Ode to Joy" over and over so that the receiving station could tune them in. This recording is from October 31, 1998 at Coe Hill, Ontario, Canada, and the frequency they were using was 8725 kHz upper sideband. My receiver was a Panasonic RF-3100 hooked up to a long wire antenna.The station was identified by Richard "RD" Baker, editor of Communications Confidential, in the January 1999 issue of Popular Communications magazine. In his Reader Mailbag section, he wrote:"Dan Greenall in Ontario, Canada, has been hearing a new (at least to folks in North America) maritime marker on 8725.0 USB: Beethoven's 9th Symphony "Ode to Joy" is repeated. In trying to track this marker down, we sent the call out over the WUN Club's listserver. Costas Krallis in Greece, Fabrizio Magrone in Italy. Alex Wellner and Robin Harwood. both in Australia. all became involved. They soon began logging the marker on other maritime frequencies. Eventually, it was noted on 6513, 8725, 8797, 13161, and 17341. Only one station has those frequencies in common: HLS, Seoul Radio. South Korea. The marker was completely IDed within 32 hours!"

SCRIPT:Amateur Radio Newsline Report 2471 for Friday, March 7th, 2025 Amateur Radio Newsline Report Number 2471 with a release date of Friday, March 7th, 2025 to follow in 5-4-3-2-1.The following is a QST. A survey reveals some important trends in Brazilian amateur radio. Huntsville's new museum of communications and technology is open -- and the founder of the Hurricane Watch Net becomes a Silent Key. All this and more as Amateur Radio Newsline Report Number 2471 comes your way right now.** BILLBOARD CART**SURVEY GIVES DETAILED SNAPSHOT OF HAM RADIO IN BRAZILPAUL/ANCHOR: Our top story takes us to Brazil where a recent survey is providing a detailed look at trends among hams in South America's largest nation. Jeremy Boot G4NJH shares some of its findings.JEREMY: An important snapshot of the state of amateur radio in Brazil has provided the national ham radio society and the telecommunications regulator with insights into relevant trends. The sampling of 940 hams in 27 states and 350 cities was conducted in May of 2024 by Guillermo Crimerius, PY2BIL, a member of the board of the Sao Paulo chapter of LABRE, the Liga de Amadores Brasileiros de Rádio Emissão. Guillermo told Newsline that the findings are also being shared with the regulator ANATEL.He said that the findings held no surprises but many details were nonetheless significant. Brazil's ham radio community remains predominantly male, with women comprising only 2 percent of the hobby. Survey results also showed that hams are an aging population in Brazil: 72% are between 40 and 70 years old, with most of them between 40 and 60. While new licensees continue to join Brazil's ham community every year, there is low membership in clubs and associations, giving little opportunity for the networking and skills training usually provided by them. Guillermo writes: [quote] "This scenario has had an impact on new generations of hams,who face difficulties in learning the essential technical matters and especially the operational and cultural activities." [endquote]For a full copy of the report, which is downloadable, visit the link in the text version of this week's newscast at arnewsline.orgThis is Jeremy Boot G4NJH.(GUILLERMO CRIMERIUS, PY2BIL)**NOMINATE THE NEXT "YOUNG HAM OF THE YEAR"PAUL/ANCHOR: We remind our listeners that young hams who live in the continental United States have an opportunity to make news, if they aren't already doing so, by being a recipient of this year's Amateur Radio Newsline Bill Pasternak Memorial Young Ham of the Year Award. Consider nominating an amateur radio operator 18 years of age or younger -- someone who has talent, promise and a commitment to the spirit of ham radio. Find application forms on our website arnewsline.org under the "YHOTY" tab. Nominations are now open. We are accepting nominations through May 31st.**BRANDMEISTER DMR PHASING OUT SOME RADIO IDSPAUL/ANCHOR: Certain Radio IDs that have been in use on the Brandmeister DMR network are going away later this year. Sel Embee KB3TZD explains.SEL: The Brandmeister DMR network has announced that it is phasing out its support of certain Radio IDs that do not comply with the Mobile Country Code, or MCC, numbering system. This means that by June, radio operators with certain DMR IDs will need to request new numbers to be assigned to their radios. The first phase of these changes will begin on the 1st of June, when Brandmeister will stop supporting five-digit CAP+ IDs. Starting on the 1st of January, 2026, radios with seven-digit personal radio IDs that begin with the numeral 1 will also stop working on the network. In making this announcement, Brandmeister assured repeater operators that it will continue indefinite support of repeaters that have six-digit radio IDs.Brandmeister said in its announcement in late February that this an effort to address improperly numbered Radio IDs – something Brandmeister has been trying to contain for seven years. It said on its website: [quote] The Brandmeister DMR platform is a constantly evolving system, requiring regular optimizations and maintenance to ensure its efficiency, reliability, and alignment with global open standards.” [Endquote]New IDs can be obtained through Radio ID (Radio Eye Dee) dot net (Radioid.net).For further instructions visit the Brandmeister link that appears in the text version of this week's newscast at arnewsline.orgThis is Sel Embee KB3TZD.[DO NOT READ: news.brandmeister.network](NEWS.BRANDMEISTER.NETWORK, AMATEUR NEWS DAILY)**3 IRISH "KILMOLIN CLUSTER" BEACONS GO QRT TO RELOCATEPAUL/ANCHOR: A trio of beacons in Ireland have been taken out of service in preparation for being moved, as we hear from Jeremy Boot G4NJH.JEREMY: In Ireland, three beacons that have been operating from a site south of Dublin have gone QRT to allow for their relocation. The EI4RF, EI1KNH and EIØSIX beacons have been part of what is known as the Kilmolin cluster. They had been hosted by Paddy Geoghegan, EI5HS, who became a Silent Key last year.The beacons, which have a new owner, went off the air in mid-February and are expected to slowly come back. According to reports on groups.io and the SWLing Post blog, the EI4RF 4-metre beacon is expected to be the first to return, perhaps by May just as sporadic-E season begins. The EIØSIX beacon is expected to follow sometime afterward on 6-metres. It was unclear how and when service will be restored on the EI1KHN beacon, which operated on 40 and 60 MHz. It is also unclear whether this beacon will need to be assigned a new callsign.This is Jeremy Boot GF4NJH.(EI7GI BLOG, QRZ.COM, SWLING POST)**UNIVERSITY IS W. BENGAL'S 1ST TO HAVE HAM CLUB STATIONPAUL/ANCHOR: Students and faculty in India are celebrating the establishment of the first state-of-the-art shack on a West Bengal state university campus. Graham Kemp VK4BB tells us more.GRAHAM: Aliah University, a state university that created for the education of many of India's minority populations, is about to become the first university in West Bengal with its own state-of-the-art ham radio club station.The announcement was made in late February in connection with a seminar held on the Kolkata campus introducing students and faculty to various aspects of amateur radio. The one-day session, held on the 24th of February, covered emergency communications and radio technology and included hands-on experience for the estimated 250 attendees. It was led by members of the West Bengal Radio Club, the Indian Academy of Communication and Disaster Management and organized by the school's Department of Electronics and Communication Engineering. A number of other schools have hosted similar amateur radio workshops throughout the region, which is a coastal area subject to violent storms and other natural disasters that rely on alternate forms of communication. This is Graham Kemp VK4BB.(MILLENNIUM POST)**BROADCAST TRADE SHOW DROPS RECEPTION FOR HAMSPAUL/ANCHOR: Hams will no doubt be among those visiting the National Association of Broadcasters annual trade show again this year but something will be missing, as we learn from Ralph Squillace KK6ITB.RALPH: The annual trade show of the National Association of Broadcasters is welcoming industry professionals once again this year to Las Vegas in April. One traditional event will be missing from this year's show, however: There will be no separate reception for amateur radio operators.Hams, of course, are still welcome. Indeed, many broadcast professionals - especially those on the engineering side - enjoy an active and robust time on the air on the amateur bands. A posting on the Radio World website said that this year's ham reception was not on the schedule. The reception had been hosted for a long time by Bob Heil K9EID, who became a Silent Key last year.The article said that organizers are hoping to [quote] "reinvent the event for next year by exploring fresh partnerships and innovative ideas." [endquote]In the meantime, licensed hams who work in the industry can still look forward to the usual opportunities for networking and learning about new technology. The NAB Show takes place between April 5th and 9th at the Las Vegas Convention Center.This is Ralph Squillace KK6ITB.(RADIO WORLD)**BREAK HERE: Time for you to identify your station. We are the Amateur Radio Newsline, heard on bulletin stations around the world including the WB3GXW repeater in Silver Spring, Maryland and simultaneously on EchoLink Conference Server Node 6154 on Saturdays at 8 PM and Sundays at 7 PM Eastern time.**DX INDIA FOUNDATION PREPARES FOR DXPEDITIONNEIL/ANCHOR: In India, there's a new DX foundation that has lots of energy and ambition - and plans for a rarely activated island. We learn more from Jason Daniels VK2LAW.JASON: It's still early in the game for the newly organized not-for-profit DX India Foundation but the team has already announced ambitious plans to increase India's presence on the DX map. As part of its mission to activate rare IOTA islands, conduct DXpeditions and provide DX and POTA chasers with a chance to work different entities in India, the team has its sights set on Arnala Island, IOTA number AS-169, which is near Mumbai. According to an announcement from the team, the island has had no amateur radio activity since 2006. Hams from the DX India Foundation have applied to use the callsign AU2M and hope to be on the air from the 29th of May through to the 1st of June. Later plans include a 10-day adventure to the Lakshadweep archipelago off the coast of Kerala [CARE-ruh-luh] in southern India.The DX India Foundation has also established an online forum in groups.io to encourage a sense of international community for chasers and activators. In between trips, the foundation's activity will be focused on training and mentoring other radio operators.This is Jason Daniels VK2LAW.(DX INDIA FOUNDATION)**HUNTSVILLE'S ‘SIGNALS' MUSEUM OPENS IN ALABAMAPAUL/ANCHOR: Huntsville, Alabama, home of the Huntsville Hamfest, has a new way to celebrate technology and, of course, amateur radio. To welcome the museum and honor the spirit and advancements made in technology, Newsline is departing from the norm this week. This report is being read via artificial intelligence and a correspondent known as AI-Drew.AI-DREW: On March 1st, the SIGNALS Museum of Information Explosion opened its doors to what founders hope will be an immersive and hands-on environment for visitors. The museum, housed a short drive from where the Huntsville Hamfest is held each year, has an array of exhibits devoted to communications technology in all its forms throughout history. Amateur radio operators who are visiting will be particularly interested in the ham shack, a welcoming space for regional radio clubs and other radio operators to meet or work on building equipment. The museum also has an on-site radio tower.Whether you live in the area or plan to visit Huntsville this year, the museum will welcome you. Visit their website at signals hyphen museum dot org. (signals-museum.org)This is AI-Drew.(SIGNALS MUSEUM)**SILENT KEY: GERRY MURPHY, K8YUW, FOUNDER OF THE HURRICANE WATCH NETPAUL/ANCHOR: Atlantic hurricane season is still a few months away but hams and forecasters will be going forward into this year's season without the man who created the Hurricane Watch Net 60 years ago. He has become a Silent Key, as we hear from Randy Sly W4XJ.RANDY: It can be said that the seeds of the Hurricane Watch Net were planted in 1965 as Hurricane Betsy raged its way through the Bahamas, making landfall in the US that September. Gerald Murphy, K8YUW, who was stationed by the US Navy in Rhode Island at the time, was also handling messages and phone patches for the Intercontinental Amateur Radio Net. When hurricane-specific traffic started to overwhelm the regular net's messages on their 20m frequency, Gerry suggested that those messages be handled 5 kHz higher. Marcy Rice, KZ5MM, who was in the Panama Canal Zone QSY'd with him up to 14.325 MHz and that was the genesis of the Hurricane Watch Net.The net has become the backbone of a robust communications system during storm season. Trained hams share advisories, data and post-storm damage information in affected areas with national hurricane centers in the US and, when needed, Canada.Gerry, who became a Silent Key on the 25th of February at the Ohio Veterans Home in Sandusky, leaves behind this vibrant legacy. He served as net manager from September of 1965 until February of 1988, staying on afterward as assistant net manager. Health issues compelled him to retire from the net in March 1991.The Hurricane Watch Net has been planning an on-air special event in September to mark its 60th anniversary. Net manager Bobby Graves,KB5HAV, told Newsline [quote] "I was hoping and praying Jerry would make it to see his creation's 60th Anniversary this coming Labor Day....We will endeavor to make it even more special." [endquote]Gerry was 88.This is Randy Sly W4XJ.(BOBBY GRAVES, KB5HAV; EDDIE MISIEWICZ, KB3YRU)**WORLD OF DXIn the World of DX, Chris, WA7RAR, is on the air until the 16th of March from Barbados, IOTA Number NA-ØØ21. He is using the callsign 8P9CB, operating SSB and CW on 20-10 metres. Some of his locations are POTA sites. See QRZ.com for QSL details.Rockwell, WW1X, is using the callsign VP5/WW1X from Providenciales, IOTA Number NA-ØØ2 in the Turks and Caicos Islands from the 8th through to the 15th of March. This is a QRP operation using only SSB, although Rockwell has not ruled out occasional use of FT8. QSL via LoTW.Listen for Aldir, PY1SAD, who is using the callsign 8R1TM from Georgetown, Guyana, between the 11th of March and the 26th of April. Aldir is using CW, SSB and the digital modes on the HF bands. He is also operating via satellite. See QRZ.com for QSL details.Members of the Korean Amateur Radio League are on the air in March and April to celebrate the centenary of the International Amateur Radio Union. They are using the callsign HL1ØØIARU. See QRZ.com for QSL details.(425 DX BULLETIN)**KICKER: ECHOES OF A DIFFERENT WAY TO LEARN CWPAUL/ANCHOR: We end this week's report with an alternate way in which some hams in New Zealand got to learn and practice CW while having real QSOs. We'll let Jim Meachen ZL2BHF explain how it happened.JIM: If you've ever wondered whether Echolink is a viable mode for teaching or learning CW, just ask Ted ZL1BQA, who is proud to have logged a respectable number of CW contacts during the recent Jock White Memorial Field Day in New Zealand. Studying CW for almost a year with the Franklin Amateur Radio Club, Ted was able to restart his long-ago code skills in sessions led by the club president Peter Henderson ZL1PX. It was done over Echolink.Ted had enrolled last May along with three younger members who were first-time learners - Francois, ZL4FJ, Steve, ZL1TZP and Steve ZL1SPR. With only Ted able to copy Peter's signal over HF, the club followed a suggestion made by Gary ZL1GAC: try Echolink, a computer-based ham radio mode that incorporates VoIP technology. Loading CW software onto his computer, Peter was able to send the code intended for each session, confident that everyone had an equal chance of copying clearly.Weekly sessions soon expanded to twice a week as the students concentrated on letters, then numbers - and eventually basic punctuation.After a break in the action, the club is back on Echolink with CW sessions three nights a week. As for Ted, he's on a roll. Peter told Newsline in an email that he has resumed making CW contacts on a daily basis on HF using the Vibroplex that once collected dust instead of QSOs.This is Jim Meachen ZL2BHF.(QUA, Peter Henderson, ZL1PX)**Have you sent in your amateur radio haiku to Newsline's haiku challenge yet? It's as easy as writing a QSL card. Set your thoughts down using traditional haiku format - a three-line verse with five syllables in the first line, seven in the second and five in the third. Submit your work on our website at arnewsline.org - each week's winner gets a shout-out on our website, where everyone can find the winning haiku.NEWSCAST CLOSE: With thanks to Amateur News Daily; Bobby Graves, KB5HAV; Brandmeister; David Behar K7DB; DX India Foundation; Eddie Misiewicz, KB3YRU; EI7GI Blog; Guillermo Crimerius, PY2BIL; Millennium Post; Peter Henderson, ZL1PX; QRZ.com; QUA Newsletter; Radio World; shortwaveradio.de; SWLing Post; Wireless Institute of Australia; and you our listeners, that's all from the Amateur Radio Newsline. We remind our listeners that Amateur Radio Newsline is an all-volunteer non-profit organization that incurs expenses for its continued operation. If you wish to support us, please visit our website at arnewsline.org and know that we appreciate you all. We also remind our listeners that if you like our newscast, please leave us a 5-star rating wherever you subscribe to us. For now, with Caryn Eve Murray KD2GUT at the news desk in New York, and our news team worldwide, I'm Paul Braun WD9GCO in Valparaiso Indiana saying 73. As always we thank you for listening. Amateur Radio Newsline(tm) is Copyright 2025. All rights reserved.

Foundations of Amateur Radio Recently I received a lovely email from Michele IU4TBF asking some pertinent questions about the Bald Yak project. If you're unfamiliar, the Bald Yak project aims to create a modular, bidirectional and distributed signal processing and control system that leverages GNU Radio. The short answer to how I'm doing getting GNU Radio to play nice with my computer is that I have bruises on my forehead from banging my head against the wall. When I get to success I'll document it. To be clear, I'm not sure what the root cause is. I suspect it lies between the GNU Radio developers, the people making packages and the manufacturer of my computer. I'm the lucky one stuck in the middle. A more interesting question that Michele asked was, for Bald Yak, what is the A/D and D/A requirement for making GNU Radio talk to an antenna? This is a much deeper question that meets the eye and I think it serves as a way to discuss what I think that this project looks like. Ultimately in the digital realm, to receive, an analogue antenna signal needs to be converted to digital using an Analogue to Digital or A/D converter, and to transmit, the reverse uses a Digital to Analogue or D/A converter to make an electrical signal appear on your antenna. The specific A/D or D/A converter determines what you can do. The sampling rate of such a converter determines what frequencies it can handle, the sample size determines the range of signals it can handle. You can compare it with a video screen. The sample rate determines how many pixels on the screen, the sample size determines how many colours in each pixel. The sample rate of an A/D converter is measured in samples per second. If the device only has one channel, you could think of this as Hertz, but if there are multiple channels, like say a sound-card, the sample rate is likely equally divided across each channel. You might have a sound card capable of 384 thousand samples per second, or kilo-samples, but if it supports simultaneous stereo audio input and output, only 96 of those 384 kilo-samples will be allocated to each channel and only half of those will actually help reconstruct the audio signal, leaving you with 48 kHz audio. In other words, the advertised frequency response might not have a direct and obvious relationship with the sample rate. At the moment I have access to a few different A/D and D/A converters. The simplest one, a USB audio sound card, appears to do up to 192 kilo-samples at 16 bits. The next one, an RTL-SDR tops out at a theoretical rate of 3.2 million or mega-samples at 8 bits. The Analog Devices ADALM-PLUTO, or PlutoSDR handles 61.44 mega-samples at 12 bits. Now, to be clear, there are other limitations and considerations which I'm skipping over. Consider for example the speed at which each of these devices can talk to a computer, in this case over USB. I'm also going to ignore things like mixers, allowing devices like the RTL-SDR and PlutoSDR to tune across frequency ranges that go beyond their sample rate. Each of these three devices can convert an analogue antenna signal into bits that can be processed by GNU Radio. All of them can also be used to do the opposite and transmit. Yes, you heard me, several amateurs figured out that an RTL-SDR can actually transmit. Credit to Ismo OH2FTG, Tatu OH2EAT, and Oscar IK1XPV. The point being that whatever Bald Yak looks like, it will need to handle a range of A/D and D/A converters. As I've said previously, I'm aiming for this to work incrementally for everyone. This means that if you have a sound card in your computer or an $8 USB one, this should work and if you have an $33,000 NI Ettus USRP X410 lying around, this too should work. Also, if you have an X410 lying around not doing anything, I'd be happy to put it to use, you know, for testing. So, kidding aside, what about the rest of the Bald Yak experience? GNU Radio works with things called blocks. Essentially little programs that take data, do something to it, then output it in some way. It follows the Unix philosophy, make each program do one thing well, expect the output of every program to become the input to another, design and build software to be tried early and use tools rather than unskilled labour. Amateur radio transceivers traditionally use electronics blocks, but if we move to software, we can update and expand our capabilities as the computer we're using gets faster and the GNU Radio blocks evolve, and because it's all digital the computer doesn't actually have to be in the same box, let alone the same room, it could be in multiple boxes scattered around the Internet. So, the idea of Bald Yak is a collection of blocks that allow you to do radio things. You might have a separate box for each amateur radio mode, AM, FM, SSB, RTTY, CW, WSPR, FT8, FT4, Q65, but also modes like Olivia, FreeDV, SSTV, Packet, PSK31 or Thor. Instead of having to figure out how to wire these modes into your radio and your computer, the infrastructure is already there and you just download another block for a mode you want to play with. We'll need to deal with variables like which A/D and D/A converter is being used and what their limitations are. We'll also need to build a command and control layer and probably a few other things. I'm considering a few other aspects. For example, GNU Radio is mostly run with text files. We might distribute those using something like a web store. GNU Radio is proving hard to install, perhaps a LiveCD is the way to go. We'll need to come up with a base level of functionality and the documentation to go with it. I'm still contemplating how to best licence this all, specifically to stop it from being exploited. Feel free to get in touch if you have ideas. I'm Onno VK6FLAB

Un simple extrait de voix de 5 à 30 secondes, et voilà qu'une intelligence artificielle est capable d'imiter une voix avec une précision troublante. C'est la prouesse réalisée par Zonos, le tout dernier modèle open-source de la société Zyphra. Disponible en version bêta, ce modèle de synthèse vocale illustre autant l'évolution fulgurante de l'IA que les défis éthiques qu'elle soulève. Zonos repose sur deux modèles avancés, chacun intégrant 1,6 milliard de paramètres. L'un utilise une architecture transformers, tandis que l'autre combine cette approche avec Mamba (SSM), optimisant ainsi la latence et la consommation de mémoire. Open-source sous licence Apache 2.0, il est librement accessible sur GitHub et Hugging Face, une aubaine pour les développeurs et chercheurs.L'IA a été entraînée sur un impressionnant corpus de 200 000 heures d'audio multilingue (anglais, français, espagnol, chinois, japonais, allemand). Elle peut ainsi générer des voix synthétiques ultra-réalistes, modulables selon plusieurs paramètres : débit, hauteur, émotion (joie, colère, tristesse). Le tout en haute fidélité (44 kHz) et avec une latence réduite entre 200 et 300 millisecondes sur une carte NVIDIA RTX 6000 Ada. Facile à installer, Zonos permet, via une interface intuitive, d'importer un échantillon vocal et de générer un fichier audio personnalisé en quelques secondes. Une accessibilité qui pose immédiatement la question des usages malveillants. Lors de tests réalisés par The Register, des enregistrements produits avec Zonos ont trompé des proches pendant quelques secondes, avant que de légères anomalies (rythme mécanique, intonations artificielles) ne révèlent la supercherie. Mais ces imperfections pourraient rapidement disparaître avec l'amélioration des algorithmes.Les risques sont bien réels : arnaques vocales, usurpations d'identité, faux messages politiques, deepfakes. En 2024, plusieurs escroqueries sophistiquées utilisant des imitations de voix ont déjà été signalées en Europe. Pour autant, cette technologie ne présente pas que des dangers. Zonos pourrait être utilisé pour restaurer la voix de personnes ayant perdu l'usage de leurs cordes vocales, améliorer les livres audio multilingues, ou encore faciliter la création de contenus accessibles. Zyphra affirme vouloir encourager l'innovation dans ces domaines, mais son approche open-source facilite une diffusion rapide et incontrôlée. Alors que des entreprises comme ElevenLabs ou Apple explorent des usages encadrés dans un cadre médical ou commercial, Zonos échappe à toute régulation. Hébergé par Acast. Visitez acast.com/privacy pour plus d'informations.

Many thanks to SRAA contributor Dan Greenall, who shares the following recording and notes:Broadcaster: Deutsche Welle, Kigali, Rwanda relay 1971Frequency: 11.965 MHzReception location: Ancaster, Ontario, CanadaReceiver and antenna: Hallicrafters S-52 using a longwire antennaNotes: When this recording was made in 1971, the easiest way to add Rwanda to your "countries heard" totals was to log the Deutsche Welle (Voice of Germany) relay in Kigali. The station could be heard quite well here in southern Ontario, Canada even though broadcasts were not directed to eastern North America. My QSL card has them using 11965 kHz, however I am not fluent in German and this recording could possibly have been made on a different frequency. This relay station was closed down in 2015 after 50 years of operation.

Consider supporting my show with a donation via PayPal to vorwinfo@gmail.com it needs your help to survive! Main Broadcasts: 4840 kHz at 2 AM Eastern every Saturday Morning (New Show) 4840 kHz at 12 AM Eastern every Monday Morning (New Show) Repeat Airings: 5950 kHz at 7 PM Eastern every Saturday Evening (Rebroadcast) 5950 kHz at 8 PM Eastern every Sunday Evening (Rebroadcast) 17810 kHz at 10:30 AM Eastern every Monday Morning (South Asia Program) 15770 kHz at 3 PM Eastern every Tuesday Afternoon (Rebroadcast) 7570 kHz at 6 PM Eastern every Wednesday Evening (Rebroadcast) 7780 kHz at 6 PM Eastern every Wednesday Evening (Rebroadcast) 9395 kHz at 10 PM Eastern every Wednesday Evening (Rebroadcast) 15770 kHz at 11 AM Eastern every Thursday Morning (Rebroadcast) 9955 kHz at 6 PM Eastern every Thursday Evening (Rebroadcast)

Foundations of Amateur Radio Have you ever come across a solution to a problem that you sort of knew you had, but didn't really appreciate until that moment? I had one of those recently. To set the scene, fair warning, we're not going to solve this today, we're still very much shaving yaks, but there's plenty to take away. So, the scene. I'm hosting my weekly net. It's going well. All the internet links are up and running again, thanks to the hard work behind the scenes of several unsung heroes, I can name a few, Bob VK6ZGN, John VK6RX and Rob VK6LD, but there are plenty of others whom I don't know and who have yet to stick up their hand to say, I was there. Regardless, thank you. Anyway, I'm hosting my weekly net, F-troop. A curious thing is occurring. Two of the stations are emitting a tone during their transmission. I'm pretty hot on how things sound, so I ask. We talk about it for a bit when Allen VK6XL comes in and tells us that according to his spectrum analyser it's a 1 kHz tone with harmonics and it's on all transmissions, just audible on two. This starts a conversation about spectrum analysers when Allen mentions that he's using an audio spectrum analyser, a piece of software running on his computer. The software has a copyright from 1999 and based on the documentation I saw, has lots of excellent functionality. I might even be able to run it on a Linux machine using WINE, but that's an adventure for another day. Randall VK6WR points out that I could use the spectrum display on Audacity. This is a much more current piece of software, but it's not intended for real-time use, it's what I use to edit the audio after recording my podcast. Not even sure if the spectrum display can show during recording, I've never tried. In the past I've used SoX, the Swiss Army knife of sound processing to create sonograms, but that too isn't real-time. Then it hits me. I have a real-time tool. I've been playing with it for weeks. GNU Radio. Surely it has a spectrum display, and indeed it does, several. So, I already have a tool, purpose built for processing signals, that can do all the things I'm looking for and some I've not yet imagined. Before I proceed, I'll remind you that we're in the middle of the Bald Yak project, so named because by the time we're done there won't be much hair left, if any. In case you're unfamiliar, the Bald Yak project aims to create a modular, bidirectional and distributed signal processing and control system that leverages GNU Radio. So, boldly clicking about, I set on the notion of making a block called "fosphor" work. Depending on which description you use, it's an Open Source, GPU-accelerated FFT and Waterfall display tool. What that means is that it uses a graphics processor to do the heavy lifting and has the ability to show signal levels across frequencies and on a waterfall display. Apparently it's a block for RTSA-like spectrum visualisation. I'm fairly sure that doesn't mean Railway Technical Society of Australasia or has any relationship with Reverse Total Shoulder Arthroplasty or the Road Transport and Safety Agency of Zambia. I'll admit that I didn't see the GPU part of that description until several days later. Had I seen it at the time, I would likely have carefully backed away and shelved the idea, but that's all water under the bridge. To cut to the chase, I have yet to make this show a single pixel. I smelled trouble for the first time when I discovered a post asking if anyone had gotten this to work on a current release of Debian. I came across a lovely post by what appears to be the author helping some hapless user, and I'll confess that's the camp I'm currently in, to make it work. I have no doubt that I can make it work, but that's going to take some effort. Now, at this point you might ask me why I wasted your time with this tale of woe? Well, the answer is simple. This is what "Yak Shaving" looks like. You solve a thousand little problems, one at a time, and if you manage to keep track of what you're doing and why, you can get stuff done. This applies here, but it also applies in your life, in radio, in antenna building, in making a contact, in participating in a contest, in activating a park. Each activity reveals myriad issues that you'll each need to resolve. The more practice you have at this, the better you'll get. I will point out that for me it's not without stress. When I go though intractable problems I'm often as grumpy as a bear with a sore tooth whilst my brain is running like a hamster in a wheel generating kilowatts of power. This too shall pass. Oh, because I know it's bothering you. RTSA, Real Time Spectrum Analyser, obvious, right? I'm Onno VK6FLAB

Many thanks to SRAA contributor, Dan Greenall, who shares the following recording and notes:Broadcaster: Radio Veritas Asia, Quezon City, PhilippinesDate of recording: September 28, 1999Starting time: 1200 UTCFrequency: 9.505 MHzReception location: Coe Hill, Ontario, CanadaReceiver and antenna: Drake SW-8 and a very long wire antennaNotes: Here is Radio Veritas Asia in Quezon City, Philippines as recorded at a DX camp in Coe Hill, Ontario, Canada on September 28, 1999. Part of their interval signal is heard along with a station ID in English. They give their frequency as 9505 kHz and the time as 1200 UTC.

HETMA would like to thank Audinate for sponsoring us during ISE 2025!Audinate is a leading provider of professional digital audio networking technologies, specializing in the development of Dante, a platform that distributes uncompressed, multi-channel digital audio over standard Ethernet networks. Dante enables seamless interoperability between audio devices, offering high-quality, flexible solutions with a lower total cost of ownership.During ISE 2025, they are at Booth 2S700, with large displays showing off new hardware and software features that are taking Dante into the realm of a full fledged AV ecosystem. They were proud of their new Dante AVIO Install Line bringing channel input and output adapters with Phoenix connectors and versatile mounting brackets.Our HETMA volunteers were excited to see the new Dante Virtual Soundcard Pro enabling up to 128 channels at 96 KHz and clocking support and the advancement of Interoperable Dante Media encryption.We believe the higher capacity and quality and encryption support will help tech managers keep up with network security scrutiny on campus but still have the flexibility of multiple manufacturers with a standardized encryption scheme on the network audio they already use.But don't just take our word for it! According to Kat Taub, Dante is more than just audio transport with solutions for video, management, and control you can do it all with Dante now.For those interested in learning more about Audinate and the products featured at ISE, head over to https://www.audinate.com/ and follow them on X: https://x.com/audinate and LinkedIn: https://www.linkedin.com/company/audinate/.

Many thanks to SRAA contributor, Dan Greenall, who shares the following recording and notes:Broadcaster: Radio Alma Ata, Kazakh S.S.R. 1971Frequency: 9,380 kHzRecption location: Ancaster, Ontario, CanadaReceiver and antenna: Hallicrafters S-52 using a longwire antennaNotes: Here is the interval signal and sign on announcement from Radio Alma Ata in Kazakhstan as heard in Ancaster, Ontario, Canada in 1971. They were on 9380 kHz and I was listening on a Hallicrafters S-52 receiver hooked up to an outdoor long wire antenna. Just using an open mike placed in front of the speaker and appears the mike was shut off briefly between the interval signal and the voice announcement.

Consider supporting my show with a donation via PayPal to vorwinfo@gmail.com it needs your help to survive! Main Broadcasts: 4840 kHz at 2 AM Eastern every Saturday Morning (New Show) 4840 kHz at 12 AM Eastern every Monday Morning (New Show) Repeat Airings: 5950 kHz at 7 PM Eastern every Saturday Evening (Rebroadcast) 5950 kHz at 8 PM Eastern every Sunday Evening (Rebroadcast) 17810 kHz at 10:30 AM Eastern every Monday Morning (South Asia Program) 15770 kHz at 3 PM Eastern every Tuesday Afternoon (Rebroadcast) 7570 kHz at 6 PM Eastern every Wednesday Evening (Rebroadcast) 7780 kHz at 6 PM Eastern every Wednesday Evening (Rebroadcast) 9395 kHz at 10 PM Eastern every Wednesday Evening (Rebroadcast) 15770 kHz at 11 AM Eastern every Thursday Morning (Rebroadcast) 9955 kHz at 6 PM Eastern every Thursday Evening (Rebroadcast)

Many thanks to SRAA contributor Carlos Latuff, who shares the following recording, notes, and original artwork:This is part of the Radio Nikkei 1 program (in Japanese), listened by me in Porto Alegre, Brazil, on 6055 kHz, on January 18, 2025, between 08:38 and 09:10 (UTC). The content is as follows: Commercial break J-Music Time Recommended Lani-chan Commercial break Cinema: Night on the Silver Screen

Many thanks to SRAA contributor Paul Walker, who shares the following recording of the BBC World Service Dari language service made on July 13, 2024 at 04:35 UTC on 17750 kHz. The reception location was McGrath, Alaska:

Consider supporting my show with a donation via PayPal to vorwinfo@gmail.com it needs your help to survive! Main Broadcasts: 4840 kHz at 2 AM Eastern every Saturday Morning (New Show) 4840 kHz at 12 AM Eastern every Monday Morning (New Show) Repeat Airings: 5950 kHz at 7 PM Eastern every Saturday Evening (Rebroadcast) 5950 kHz at 8 PM Eastern every Sunday Evening (Rebroadcast) 17810 kHz at 10:30 AM Eastern every Monday Morning (South Asia Program) 15770 kHz at 3 PM Eastern every Tuesday Afternoon (Rebroadcast) 7570 kHz at 6 PM Eastern every Wednesday Evening (Rebroadcast) 7780 kHz at 6 PM Eastern every Wednesday Evening (Rebroadcast) 9395 kHz at 10 PM Eastern every Wednesday Evening (Rebroadcast) 15770 kHz at 11 AM Eastern every Thursday Morning (Rebroadcast) 9955 kHz at 6 PM Eastern every Thursday Evening (Rebroadcast)

Many thanks to SRAA contributor, Dan Greenall, who shares the following recording and notes:Broadcaster: Radio 4VEH Cap Haitien Haiti 1970'sFrequency: 9.770 MHzRecption location: Ancaster, Ontario, CanadaReceiver and antenna: Hallicrafters S-52 using a longwire antennaNotes: The first audio clip is likely a "recording of a recording." Back in the 1970's, some DX programs, notably DX Jukebox (Radio Nederland) and SWL Digest (Radio Canada International) would occasionally play "off the air" recordings of shortwave stations heard by listeners. Such may be the case here. The second clip is Radio 4VEH in Cap Haitien, Haiti as heard on 9770 kHz in April 1970. The station only ran 2500 watts of power but could be heard most mornings local time. Received using a Hallicrafters S-52 and long wire antenna at Ancaster, Ontario, Canada.

This show has been flagged as Clean by the host. Studying for a license from the Radio Society of Great Britain lead to an interesting experiment. What happens if one sine wave is modulated with another sine wave? Similar to sending a pure tone over AM radio. Apparently the result is two frequencies, one equal to the difference of the two original frequencies and one equal to the sum. Creating two tones and multiplying them in Nyquist Prompt in Audacity then plotting the resulting spectrum concurs. (mult (sound (hzosc 1000)) (sound (hzosc 500))) The original tones were 1 kHz and 0.5 kHz. The result was a peak at 0.5 kHz (the difference) and one at 1.5 kHz (the sum). On another note, the manual mentions in practice if one of the tones is the carrier frequency and one of them is the signal, then the carrier should not be modulated all the way down to zero or all the way up to maximum. This avoids distortion and clipping so the quality is better when received. It is also more power efficient so the transmission can travel further given the transmitter has a limited power output. Provide feedback on this episode.

Many thanks to SRAA contributor Paul Walker, who shares the following recording of the Voice of America's Korean language service made on December 28, 2024 at 1905 UTC on 9,800 kHz. The reception location was McGrath, Alaska:

Foundations of Amateur Radio Life is messy. This is not a revelation. We attempt to organise this chaos by using all kinds of magic incantations, to-do lists, new year resolutions, plans, projects and anything else you might have in your arsenal. The same chaos reigns, in how we make progress. Some days are harder than others. I'm mentioning this because I've seen a couple of amateurs share all the things they didn't achieve last year. If we used that metric, I could point out that I didn't win the lotto, likely, neither did you, or your friends. I didn't get on HF to make a contact, I didn't put up a 6BTV antenna, the list is never ending. In other words, it's easy to say what you didn't do. What if you turned this upside down? I hosted my weekly radio net for its thirteenth year, I had my beacon heard more times than I have bandwidth available to check right now, I started a project that looks like it's going to keep me busy for some time to come. I've been working my way through a full system crash and I can see light out the end of the tunnel, six months later. So, don't beat yourself up about all the things you didn't do. Speaking of that, making plans is fine, but don't use the to-do list as a way to describe all the things you didn't do, instead, think of it as an inspiration for what to do when you're bored. Chaotic aspects of life aside, the same disorder reigns supreme in the software world. GNU Radio on which I'm basing the "Bald Yak" project is just as chaotic. New versions are released regularly. Right now it's at version 3.10.something. On my Mac, it's 3.10.11.0, on my Debian machine it's 3.10.5.1. Depending on which operating system you use it's different, there's a wiki table, but that's out of date, before you ask, yes, I've requested an account on the GNU Radio wiki so I can fix it. This only scratches the surface of things that are, for want of a better word, disharmonious. This might be perceived as chaos, but the reality is that this exists throughout the computing world. If you're not a software developer you might have only scratched the surface of this, trying to open a document written for a different version of your word processor, installing a new operating system and finding software that was working perfectly before, suddenly doesn't. GNU Radio is a complex beast. The latest release has 5,570 files, making nearly 80,000 lines of source and related code. The git repository shows 579 authors and I will point out that it's likely there are more, since the project was first released in 2001, but the git repository only goes back to 2006. Said differently this is a big project that nobody is likely to hold entirely inside their brain. It means that things change without everyone involved knowing about it. I'm raising this because we're diving into a complex environment that we're using to build ourselves a new thing. At this point you might want to run for the hills. I understand. One of the great things about society is our ability to abstract. It's why I'm typing on a keyboard with letters of the alphabet and not punching holes into cardboard. It's why I'm looking at a screen with graphics and controlling images with my finger, rather than looking at dozens of blinkenlights that provide a lifetime of memories. GNU Radio is the abstraction of radio. That's the whole point. It allows us to pick up a signal block, tell it to make a kilohertz tone, connect it to my loudspeaker so sound comes out. It looks simple on the outside, but underlying that is a level of complexity that you will only encounter when it comes to raise its chaotic head. This all to say that I did make some progress. When you play an audio tape at half speed, or play a single at 33 RPM instead of 45 RPM, the result is that the audio is slower, but it also means that the audio is lower in frequency. It led me to wonder if I can use that phenomenon to help me hear better. What if I could play audio slower and have my ears be able to hear better. Right now, anything above 2 kHz is hard to hear. I keep asking my partner, "Say again?", "Sorry, what?", "Sorry, I didn't hear that." Hearing aids seem to attempt to deal with the problem by amplifying the sounds you cannot hear. This results in squealing and all manner of other unpleasantness. It also doesn't seem to help me. Instead I wondered if I could halve a 4 kHz tone to 2 kHz, I could hear it. So, if I play audio at half speed, I can hear more. Unfortunately it would also mean that I would be running behind all the time. So, what if I could play at half speed and remove half the audio samples? I can confirm that with simple tones this works and I did this inside GNU Radio with pretty much one block, "Keep M in N samples", in this case, keep one in two. I halved the sample rate and all was well. Why is this significant? Well, aside from that it might help me hear better, it represents the first time I had an idea that I could try out in realtime and see what it did. For a bunch of reasons I haven't yet moved on to actually hearing it, by setting the source as the microphone and the sink as my headphones, but that's on the cards soon. Making progress is a series of chaotic steps that take you on a journey. If you're lucky, the journey will get you where you want to go. I'm Onno VK6FLAB

We tested out the OpenWRT One and tried it in a unique use case. Then, Wes goes back to 1999 to solve a problem.Sponsored By:Tailscale: Tailscale is a programmable networking software that is private and secure by default - get it free on up to 100 devices! 1Password Extended Access Management: 1Password Extended Access Management is a device trust solution for companies with Okta, and they ensure that if a device isn't trusted and secure, it can't log into your cloud apps. Support LINUX UnpluggedLinks:

Many thanks to SRAA contributor Dan Greenall, who shares the following recording and notes:Broadcaster: La Voix de la Revolution Congolaise, BrazzavilleDate of recording: Circa 1973Frequency: 4.765 MHzReception location: Ancaster, Ontario, CanadaReceiver and antenna: Hallicrafters S-52 using a longwire antennaNotes: One of the more consistent Africans heard in the 60 metre band shortwave during the early 1970's from here in southern Ontario, Canada was La Voix de la Revolution Congolaise from Brazzaville, Republic of Congo on 4765 kHz. Best reception usually occurred at 0430 UTC sign on, or up to an hour before sign off at 2300 hours UTC. This recording is circa 1973, and you will hear part of the anthem followed by identification in French.

Many thanks to SRAA contributor Paul Walker, who shares the following field recording of the BBC World Service on 9,410 kHz made on November 25, 2024 in McGrath Alaska.

Many thanks to SRAA contributor Paul Walker, who shares the following field recording of the Voice of America on 9,775 kHz made in McGrath, Alaska on November 25, 2024. Paul notes:VOA on 9775 via Botswana in English with (one minute and eight seconds) of a dead carrier, then sign-on and programming begins.

Many thanks to SRAA contributor, Carlos Latuff, who shares the following recording and original illustrated listening report (above). This KBS recording was made on December 4, 2024 at 11:00 UTC on 11.795 MHz in Porto Alegre, Brazil.Carlos notes: “Full news bulletin (in Spanish) of KBS World Radio on South Korean president Yoon Suk-yeol martial law, listened in Porto Alegre, Brazil.” Bonus Radiofax: Kyodo News English Edition radiofax on the same topic, Dec 4, 2024, 12pm UTC, 16970 kHz.

Many thanks to SRAA contributor, Dan Greenall, who shares the following recording and notes:Broadcaster: KWHR (World Harvest Radio) Naalehu Hawaii November 10, 1996Date of recording: November 10, 1996Frequency: 9.930 MHzReception location: Thamesford, Ontario, CanadaReceiver and antenna: Panasonic RF-3100 and longwire antennaNotes: Here is World Harvest Radio with a brief English language voice announcement from their radio station KWHR, Naalehu, Hawaii as heard in Thamesford, Ontario, Canada on November 10, 1996 at 1330 hours UTC on a frequency of 9930 kHz shortwave.

Engineers are usually the unsung heroes of Broadcasting. But Mark and Paula Persons have set a high bar for professionalism in our industry. They were both inducted into the Minnesota Broadcasters Hall of Fame and join us to talk about it. Did you know that Mark never wore blue jeans to work - not even at transmitter sites? And Paula’s keen accounting and PR skills made the most of Mark’s efforts both in the field and in the repair shop. We engineers can all learn from the Persons’ professionalism and teamwork. Show Notes:The story of Mark & Paula’s induction into the Minnesota Broadcasters Hall of Fame“Where Have All the Broadcasters Gone?” - a book by Mark’s father, Charles B. PersonsAudio on MWPersons.com and on a YouTube playlist.Paula mentioned using D2 Biological Solution for restoring old headstones as part of her volunteer work with the Daughters of the American Revolution. Mark mentioned he’s written about 200 articles in Radio World magazine.Mark and Paula will visit the island municipality of Bonaire soon. While Paula goes SCUBA diving, Mark will visit PJB3, a powerful AM station on 800 kHz. Guests:Mark & Paula Persons - Retired Broadcast Engineering Team, Now Busier Than Ever Host:Kirk Harnack, The Telos Alliance, Delta Radio, Star94.3, & South Seas BroadcastingFollow TWiRT on Twitter and on FacebookTWiRT is brought to you by:Nautel and the HD Digital Radio Test DriveBroadcasters General Store, with outstanding service, saving, and support. Online at BGS.cc. Broadcast Bionics - making radio smarter with Bionic Studio, visual radio, and social media tools at Bionic.radio.Angry Audio and the new Rave analog audio mixing console. The new MaxxKonnect Broadcast U.192 MPX USB Soundcard - The first purpose-built broadcast-quality USB sound card with native MPX output. Subscribe to Audio:iTunesRSSStitcherTuneInSubscribe to Video:iTunesRSSYouTube

Many thanks to SRAA contributor, Dan Greenall, who shares the following recording and notes:Broadcaster: XERH Radio Tricolor, Mexico City 1970Frequency: 11.880 MHzReception location: Ancaster, Ontario, CanadaReceiver and antenna: Hallicrafters S-52 using a longwire antennaNotes: XERH from Mexico City, Mexico could often be heard here in southern Ontario, Canada in the Spanish language using the jingle "La RH, La RH, Radio Tricolor" to identify. They were using 11880 kHz shortwave in 1970 when this brief recording was made, and typically played "musica ranchera."

Foundations of Amateur Radio The hobby of amateur radio is one of experimentation and change. For decades this came in the form of circuit diagrams, components and scrounged hardware from anything that wasn't bolted down. New functionality came with the aid of a soldering iron. More recently, functionality comes from participation in the global electronics market where you can buy any radio you like and have it shipped to your door within hours at an unbeatable price. Mind you, buying all those unbelievably cheap radios does start adding up and if you want to use more sophisticated hardware, that too is possible, at a price, somewhere between $50 and a new Porsche. Whilst that's an option for some, for the rest of us, there are better and cheaper ways. Of course it doesn't stop there. If you connect any radio to a computer, you can use whatever software you like to encode and decode any signal you can imagine. With a traditional radio connected to a computer you can make it participate in hundreds of different so-called digital modes. Before I continue, let's look at radio in a slightly different way. Consider an antenna as a continuous source of voltages that are amplified, filtered and demodulated in some way by a radio. You can think of the combination of antenna, radio and computer as a stream decoder. To decode a signal in a new way requires a new decoder, which you could build from components or as I've said, buy online. During the week I've continued experimenting with GNU Radio. If you're unfamiliar, it's a toolkit that allows you to build so-called flow graphs that can process a signal stream. Think of it as a box of Lego that you can put together to build any type of decoder. Let me say that again. Imagine that you want to decode or transmit a mode like FreeDV, M17, APRS, Olivia, Contestia, or Hellschreiber. With the GNU Radio toolkit, all of this is possible and you won't need to buy new hardware or bust out the soldering iron every time you want to experiment with a new mode. If you have been playing with digital modes already, you'll likely point out that you can already do this today by using software running on a computer, and that's true. What that doesn't tell you is that this comes with a very specific limitation, namely that all those modes require that they fit inside a single audio channel because all those digital modes you might be familiar with are essentially using an SSB or FM signal with the audio generated or decoded by a computer. Even if you have a modern radio like for example an ICOM IC-7300, you'll still be limited in what modes of transmission you can make. ICOM limits the transmit bandwidth to 2.9 kHz. Flex Radio appears to double that to 7.9 kHz, but numbers are sketchy. The point remains, most current amateur radio technology is based around the notion that a mode essentially fits within a single audio channel and a very narrow one at that. So, why does this matter? If you run out of FT8 space on a band, right now you need to change to an alternate frequency to play, but you'll only be able to see the stations that are using the same alternate frequency, as long as they fit within the bandwidth of an audio signal. If you wanted to check out the main frequency, you'd have to change frequencies and keep switching back and forth. Using this idea, monitoring all of FT4, FT8, WSPR and all CW beacons, all at the same time becomes unimaginable, not to mention costly if you needed a radio for each band and each mode. What if you wanted to use another mode that took more than about 4 kHz, like say a 5 MHz wide DVB-T signal which you could be experimenting with on 70cm? Or, what if you'd like to compare a repeater input with its output at the same time? Or compare two repeaters together? Or find the best band to operate on right now? The point being, that there are things that simply don't fit within a single audio channel that you won't be able to play with using a traditional radio. As it happens, that too is a solved problem. Remember that I mentioned that you can think of an antenna, radio, and computer combination as a stream decoder? What if I told you that an SDR, a Software Defined Radio, is essentially a device that translates antenna voltages into numbers which you can process with GNU Radio? Whilst that does imply replacing your radio, you don't have to jump in at the deep end to start playing and even if you do decide to buy new hardware, you can get your toes wet with all manner of self build or commercial kits. Even better, you can start with the gear you already have today and become familiar with GNU Radio and when you're ready to expand your station, you can add in an SDR and continue to use the same tools to experiment. Not only that, you can do interesting things by combining what you already have. Consider for example the idea of using an RTL-SDR as the receiver with a traditional radio as the transmitter. You could decode all of the FT8 signals on a band and transmit where there was space to do so. The point being that you can do this one step at a time. Every time you download or build another GNU Radio flow graph, you can have a new decoder and as time goes on, you'll be able to decide what hardware you might want to pair it with. To be clear, I'm talking about the gradual change from component based radio using audio interfaces into software based radio. It's not like we haven't done this before. Anyone recall spark gaps, or valves? The future of experimentation is bright and it's filled with bits. I'm Onno VK6FLAB

Foundations of Amateur Radio Over the past weeks, actually, probably more accurately years, I've been carrying around an idea. It's been bubbling away and I've been trying very hard to make it solidify into something that I could explain and then hopefully attack. Today I woke up with a hunger to do some radio and ultimately tell you about it. To get to a point where my Aha! moment emerged, I need to provide some history. Traditional radio activities involve variations on a radio plugged into an antenna with the operator talking into a microphone or torturing a Morse key. If you want to operate digital modes, you essentially have two choices. You can use a rare radio with in-built digital modes or, more commonly, connect a computer to the radio via an audio interface, which essentially replaces the operator with a computer. This implies that the radio is physically connected to the computer and in the same room. What if you don't want either? There's another aspect to this. Modern SDRs or software defined radios, tend to use the network to get information from the antenna to the user. The network can transport the radio signal, but also control signals, to change things like frequency and mode, and if the radio supports it, bands, antennas and other fun stuff like filters. There are ways to control a traditional radio across the network with so-called CAT commands, or Computer Assisted Tuning. This same technology can be used to connect a logging tool, so it knows what frequency and mode to log when you make a contact. What CAT control lacks is audio. Said differently, although some solutions exist to send Morse code, you cannot use CAT to listen to the radio, or speak into a microphone. This isn't an issue if the radio and you are in the same room, but if they're not, then things get tricky. And as a final piece of background information, a traditional radio is based around audio, that is, the information going between you and the radio, or a computer and the radio, is limited to audio. This represents about 4 kHz of signal. In other words, if you're tuned to 28.500 MHz, then a traditional radio can "hear" the radio signal between 28.500 and 28.504 MHz, sufficient for a single audio signal, but even a simple digital radio, a $50 RTL-SDR using a USB cable, can handle 2.4 MHz, plenty to cover all of the 10m band between 28.0 and 29.7 MHz with room to spare. I've been looking for something, anything, that brings these two vastly different worlds together for a number of reasons. I've spoken previously about some of these. For example, I do not want to physically connect my traditional radio, a Yaesu FT-857d, to my computer because I do not want to have the potential of stray RF coming into my computer. I'd also love to be able to run the same decoding and control tools for various radios, the Pluto SDR, several RTL-SDR dongles, my 857 and other radios as they come into my shack from time-to-time. Then there's the signal processing side of things. I'd love to be able to learn how to decode Morse and eventually other modes using a computer. I also want to be able to use a voice-keyer during a contest so the whole house doesn't ring from the sound of me calling CQ Contest, or CQ DX for hours on end. I've been making inroads into this. I managed to get rigctld to work across the network using Docker containers at both ends. I attempted to get audio working, but that has so far been a dismal failure, despite assistance on several fronts. This morning I stumbled on the idea of using "GNU Radio" for both. I even came across some examples where two so-called "flow-graphs" can talk to each other across the network. Now at this point you're either going to be nodding your head, or you're going to be asking yourself what gibberish I just spouted. If you're already nodding your head, stand-by, if not, GNU Radio is a software toolkit that provides signal processing blocks that you can link together to create simple or sophisticated systems to manipulate signals, like those that come from radios, or radio telescopes, or mobile phone base stations, radar, ADS-B, or whatever else you can imagine. It's widely used in academia, government, industry, research, and of course by us, hobbyists. A collection of blocks and links is called a flow-graph and in essence it's a program or if you like, an App, that you can run. It comes with a tonne of examples and tutorials, including one where one flow-graph can manipulate another, either on the same computer, or somewhere on the Internet. What this means is that you could build a flow-graph that can talk to a Yaesu FT-857d and one that can talk to a Pluto SDR, or an RTL-SDR, or any other radio, and use that to talk to a flow-graph that understands how to deal with audio, CAT and anything else you might want to. It means that for the first time in years I can at least imagine a unified world where my 857 isn't a boat anchor when compared to my Pluto SDR. Of course they don't have the same functionality, but at least I can handle their signals in the same way. Unlike the path I was previously on, where I was attempting to cobble together several tools whilst attempting to avoid a headache from banging my head against the wall, today I can use one toolkit to build Apps that run on pretty much anything with a CPU and see the fruits of my labour. I'm working on a proof of concept and when I've got it to show-and-tell, I'll put it up on my GitHub page, cunningly named after me, VK6FLAB. A final observation. Amateur radio means different things to different people at different times. For me, today, it's about software and GNU Radio. Tomorrow it is just as likely to be about something else. What is possible depends entirely on your imagination, so get playing, either on-air, or on-line, whatever gets you smiling and remember, the impossible happens immediately, miracles take a little longer. I'm Onno VK6FLAB

Amazing that this worked out, but thanks to Pierre Lonewolf’s topic idea and Bill Murdoch’s eagerness to join us, we have a fun and informative TWiRT episode! Two chiefs who engineer at two different high-power AM radio stations - each broadcasting at 720 kHz on the AM dial. And we’re having this conversation on episode 720 of “This Week in Radio Tech!” It had to be fate! Between Pierre and Bill, we find plenty of similarities and some big differences in their transmitter operations. Pierre’s station is KOTZ in Kotzebue, Alaska. Bill’s station is WGN in Chicago, Illinois. The towers are about 3,200 miles apart from each other, so neither station gets interference from the other, but each station has interesting and individual challenges. You’ve got to check out Pierre’s and Bill’s Tips of the Week at the end of the show. Great wisdom there! Show Notes:A folder containing photos of WGN’s transmitter site from today’s show.Daytime coverage maps for KOTZ and for WGNAustin Ring Transformers - Wikipedia ArticleAustin Ring Transformers - Critical installation information from Hatfield & DawsonHistory of WGN RadioKOTZ’s website is packed with info and photos Guests:Pierre Lonewolf - Broadcast Engineer at Lonewolf CommunicationsBill Murdoch - Chief Engineer at WGN Radio Chicago Host:Kirk Harnack, The Telos Alliance, Delta Radio, Star94.3, & South Seas BroadcastingFollow TWiRT on Twitter and on FacebookTWiRT is brought to you by:Nautel and the HD Digital Radio Test DriveBroadcasters General Store, with outstanding service, saving, and support. Online at BGS.cc. Broadcast Bionics - making radio smarter with Bionic Studio, visual radio, and social media tools at Bionic.radio.Angry Audio and the new Rave analog audio mixing console. The new MaxxKonnect Broadcast U.192 MPX USB Soundcard - The first purpose-built broadcast-quality USB sound card with native MPX output. Subscribe to Audio:iTunesRSSStitcherTuneInSubscribe to Video:iTunesRSSYouTube

Amazing that this worked out, but thanks to Pierre Lonewolf's topic idea and Bill Murdoch's eagerness to join us, we have a fun and informative TWiRT episode! Two chiefs who engineer at two different high-power AM radio stations - each broadcasting at 720 kHz on the AM dial. And we're having this conversation on episode 720 of “This Week in Radio Tech!” It had to be fate! Between Pierre and Bill, we find plenty of similarities and some big differences in their transmitter operations. Pierre's station is KOTZ in Kotzebue, Alaska. Bill's station is WGN in Chicago, Illinois. The towers are about 3,200 miles apart from each other, so neither station gets interference from the other, but each station has interesting and individual challenges. You've got to check out Pierre's and Bill's Tips of the Week at the end of the show. Great wisdom there!