Category Archives: Radio History

Radio Waves: Fast Radio Bursts, Czechia DRM AM Trial, Kumartuli Radio Shop, and Ekho Moskvy Off Air

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Radio Waves:  Stories Making Waves in the World of Radio

Welcome to the SWLing Post’s Radio Waves, a collection of links to interesting stories making waves in the world of radio. Enjoy!

Astronomers detect a radio “heartbeat” billions of light-years from Earth (MIT)

The clear and periodic pattern of fast radio bursts may originate from a distant neutron star.

Astronomers at MIT and universities across Canada and the United States have detected a strange and persistent radio signal from a far-off galaxy that appears to be flashing with surprising regularity.

The signal is classified as a fast radio burst, or FRB — an intensely strong burst of radio waves of unknown astrophysical origin, that typically lasts for a few milliseconds at most. However, this new signal persists for up to three seconds, about 1,000 times longer than the average FRB. Within this window, the team detected bursts of radio waves that repeat every 0.2 seconds in a clear periodic pattern, similar to a beating heart.

The researchers have labeled the signal FRB 20191221A, and it is currently the longest-lasting FRB, with the clearest periodic pattern, detected to date.

The source of the signal lies in a distant galaxy, several billion light-years from Earth. Exactly what that source might be remains a mystery, though astronomers suspect the signal could emanate from either a radio pulsar or a magnetar, both of which are types of neutron stars — extremely dense, rapidly spinning collapsed cores of giant stars.

“There are not many things in the universe that emit strictly periodic signals,” says Daniele Michilli, a postdoc in MIT’s Kavli Institute for Astrophysics and Space Research. “Examples that we know of in our own galaxy are radio pulsars and magnetars, which rotate and produce a beamed emission similar to a lighthouse. And we think this new signal could be a magnetar or pulsar on steroids.”

The team hopes to detect more periodic signals from this source, which could then be used as an astrophysical clock. For instance, the frequency of the bursts, and how they change as the source moves away from Earth, could be used to measure the rate at which the universe is expanding. [Continue reading…]

CRA Runs DRM Digital AM Trial in Czechia (Radio World)

Transmission company CRA looks at possibility for reusing analog transmission facilities

Czech transmission services company ?eské Radiokomunikace (CRA) is testing the DRM medium-wave digital radio system on 954 kHz.

According to a tweet from Marcel Prochazka, director of legal and regulatory affairs for CRA, the transmissions are originating from ?eské Bud?jovice in South Bohemia and operating at a power of 3.16 kW from a 107-meter HAAT antenna. Continue reading →

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Archive of NASWA FRENDX Journals on World Radio History website

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Many thanks to SWLing Post contributor, Tom Gavaras, who writes:

Hi Thomas,

I hope you are having a great summer.

In the event you are not aware, there is a large collection of NASWA magazines available online from 1971-2008 including an issue from 1962.: https://worldradiohistory.com/NASWA_Frendx.htm

I see that there are also many issues from SPEEDX from 1971-1995: https://worldradiohistory.com/Speedx.htm

Best regards,

Tom

Many thanks for the tip, Tom!  The World Radio History website is such a treasure trove of radio history and nostalgia! 

I opened and read a few 1970s era NASWA journals this morning and am so happy to see quite a few names of SWLs/DXers who are still active radio enthusiasts!

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BBC Radio 4: “Scotland’s Lord Haw Haw”

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(Source: BBC Radio 4)

Scotland’s Lord Haw Haw

Radio played a key role in the propaganda campaigns of Nazi Germany. The most notorious personality in this radio war was William Joyce, or ‘Lord Haw-Haw’ – who came to be known as the English voice of Nazi Germany. But he wasn’t alone in this effort.

Professor Jo Fox of Durham University discovers the lost transcripts of Radio Caledonia, a ‘secret station’ designed to disseminate defeatist propaganda to the people of Scotland and sow seeds of dissent among its listeners. Set up by the German Propaganda Ministry in 1940, the presenter was Scottish national Donald Grant.

Jo Fox examines the Nazis’ attempts to appeal to Scottish nationalist feeling through these broadcasts and asks why, unlike Joyce, Donald Grant was spared execution.

Producer: Sarah Shebbeare.

Click here to listen on BBC Sounds.

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Alexander shares a few photos and notes from Hamradio 2022 in Friedrichshafen

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Many thanks to SWLing Post contributor, Alexander (DL4NO), who shares the following photos and notes from Friedrichshafen:

First Hamradio After Two Years

Alexander (DL4NO)

Finally the biggest amateur radio event in Europe happened again: Last weekend hams from Germany, Austria, Switzerland, France, Italy, Poland, Belgium, Netherlands, GB and more gathered in Friedrichshafen. The location is quite attractive, in Germany but near Austria and Switzerland. I could not get any numbers yet. But the event was quite a bit smaller than in 2017 when I was there the last time.

As every year amateur radio societies from Europe and the ARRL had booths. The most remarkable was from the Austrian OeVSV with their own stage. They had their own, quite interesting lectures. For example Austrian Hams have used the geostationary satellite QO-100 for LoRa experiments. They are quite active with LoRa as this technology allows to transmit data quite slowly, but quite far and with a minimum of power. Their project is called MeshCom. Continue reading →

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Radio Waves: Future of AM in UK, BBC and Nuclear War, SAQ Unable to Air on Alexanderson Day 2022, ITU Ham Station Celebrates 60 years, and RRI International Quiz

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Radio Waves:  Stories Making Waves in the World of Radio

Welcome to the SWLing Post’s Radio Waves, a collection of links to interesting stories making waves in the world of radio. Enjoy!

Opinion: The Future of AM Radio
England, Scotland, Wales and Northern Ireland (FrequencyFinder.co.uk)

Summary

AM radio in the British Isles is now in terminal decline with audiences dropping and many transmitters closed already. The majority of the remaining transmitters will likely close by the end of 2027. Over the next few years, the BBC and major commercial broadcasters will be looking to minimise their AM transmission costs by reducing transmission powers at the high-power sites and closing some of the low-power transmitters serving small audiences.

A coordinated AM shutdown may then follow at some point, most likely in 2027, though some independent broadcasters may continue using AM beyond this. This article explores these issues in more detail.

Click here to download the full PDF of this article.

The Last Word – The BBC and Nuclear War (Atomic Hobo Podcast)

This episode of the Atomic Hobo podcast focuses on the role of the BBC before and after nuclear attack:

https://soundcloud.com/user-494087291/the-last-word-the-bbc-and-nuclear-war

Click here to listen via Soundcloud.

SAQ unable to air on Alexanderson Day (The Alexander Association)

Note: the The Alexander Association has announced that they will be unable to put SAQ on the air this year on Alexanderson Day. There are no more details other than the title of their post (the content still reads as if the transmission will happen as planned).

Check the Alexander Association website for more details.

ITU’s ham radio station celebrates 60 years on air (ITU)

By Nick Sinanis, callsign SV3SJ, President of the International Amateur Radio Club (IARC), and Attila Matas, callsign OM1AM, Vice-president and Station Manager, IARC

Did you know that the United Nations specialized agency for information and communication technologies owns and operates its very own radio station?

Residing at the headquarters of the International Telecommunications Union (ITU), the 60-year-old amateur station operates under the callsign 4U1ITU.

It started broadcasting on 10 June 1962 and was officially inaugurated the following month by then UN Secretary-General U Thant and ITU Secretary-General Gerald Gross – himself a ‘’ham” radio enthusiast known by the personal callsign W3GG.

Recognized as a unique “country” in the ham radio community, 4U1ITU operates in accordance with privileges extended by ITU and the Government of Switzerland. It has also earned the DXCC (or ham radio “century club”) award from the American Radio Relay League (ARRL), confirming air contacts with 100 or more countries.

From its long-time home on the 5th floor of the Varembé Building in Geneva’s international district, this unique broadcasting outlet still today serves as a model for the highest standards of amateur radio station operation everywhere.

From one to a million

4U1ITU’s first contact, or “QSO” in ham radio parlance, was made with a German station called DL4VK. Further QSOs followed, amounting to over 1,300 contacts worldwide in the first 24 hours.

In the six decades since, ITU’s radio station has made over a million contacts using Morse code carrier wave (CW), voice (SSB), and digital operational modes, based on more than 20,000 two-way QSOs with radio amateurs around the world.

4U1ITU can operate on most of the frequency bands allocated to amateur and amateur-satellite services as identified in Article 5 of the Radio Regulations.

Aside from letting licensed radio amateurs in ITU, its Member State representatives, and its conference and meeting delegates contact fellow radio hams, the station promotes international goodwill and cooperation across the community. It also allows hands-on demonstrations of amateur radio communications for delegates and meeting participants. [Continue reading…]

RRI Voice of Indonesia: International Quiz 2022

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Radio Waves: Broadcast Tower Climbers, Sony ICF-SW1 Repair, Franken-FM Status, and Marconi in a Van

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Radio Waves:  Stories Making Waves in the World of Radio

Welcome to the SWLing Post’s Radio Waves, a collection of links to interesting stories making waves in the world of radio. Enjoy!

Spotlight on Broadcast Tower Climbers in New Documentary (Radio World)

NATE, in collaboration with Storybuilt Media, has created a feature-length documentary titled “Vertical Freedom,” which highlights the professional and personal lives of six communications infrastructure workers in the United States.

Throughout the film, these cellular and broadcast tower climbers share what compels and excites them about their line of work. Plus, how to overcome every-day danger in order to connect us all.

Ky Nguyen is just one of the climbers featured in the film. He has worked with RIO Steel and Tower out of Alvarado, Texas for the last 10 years.

After the Great Recession, Nguyen wanted to move away from his job in construction and — while he is skilled at his craft now — he was initially hired onto the tower communication service’s team with zero experience.

“I started as a climber and then just kept working my way up,” he said. “Then I became foreman and began project managing. I’m one of those types of guys where, if you want it done a certain way, you have to be with them, showing them, leading by example – so I’m climbing every day.” [Continue reading…]

Repairing the Sony ICF SW1 Receiver — Used for Numbers Station Reception? Why no replacement for C-625? (Soldersmoke)

Ten years ago, my friend John gave me this tiny Sony receiver. It wasn’t working. I tried to fix it but quickly discovered that the tiny size of the device made repair difficult. All you needed to do was to swap out some leaking electrolytics, but they are surface mount electrolytics — replacing them is not for the faint of heart. Kits are available, but again, this is not easy.

In 2020 I got one of the kits, but didn’t try to use it until yesterday. It only supplied six of the electrolytics. In the video above, they discuss replacing seven electrolytics, including the one that seems to be placed in the round black holder. C-625. Why didn’t my kit include a replacement for that one? Could it be that this capacitor was not one of the leaky SMD caps?

Replacing these caps really wasn’t easy. At one point I inadvertently removed not just the bad cap, but also a nearby surface mount resistor. Luckily the schematic showed it to be 0 ohms. That was easily replaced. I lifted one of the pads on one of the other caps — I just slid it back into place and hoped for the best. [Continue reading at Soldersmoke…]

FCC Report 5/22: FCC To Consider Franken-FM Status And Whether To Expand Radio Service On Channel 6 (Radio Insight)

The FCC has introduced a proposal for rulemaking to determine whether to permanently approve the use the spectrum of television channel 6 for analog radio service on 87.75 MHz and will vote on whether to proceed with it at its June meeting.

In July 2021, all of the remaining analog low-power television stations were required to convert to digital, which would then lead to thirteen of them resuming analog audio transmission within their ATSC 3 broadcasts on an experimental basis. The rulemaking proposal seeks comments whether FM on channel 6 operations server the public interest and should be authorized to continue, whether they should be authorized as ancillary or supplementary services and if so subject to a new rule that permits their operation subject the certain technical and operational requirements, whether they can limit future channel 6 FM operations to those stations with active STAs, whether to consider a proposal to license additional non-commercials FMs on 82-88 MHz in areas where no television stations are operating, and whether to eliminate or revise the distance separation rules between television stations on channel 6 and radio licenses in the non-commercial band.

The full proposal can be read at this link.

The petition by Educational Media Foundation and antenna manufacturers Dielectric, Jampro Antennas, Radio Frequency Systems, and Shively Labs to allow FM antenna directional pattern verification by computer modeling was approved at the FCC’s monthly open meeting. [Click here to read the full article at Radio Insight…]

A mobile exhibition celebrating the work and legacy of Guglielmo Marconi

The Marconi Van exhibition tells the story of Marconi’s pioneering work and its scientific legacy in radio and microwave physics. The exhibition combines:

Engaging exhibits and interactive activities exploring the past, present, and future of radio and communications physics.

An exploration of historical objects from the History of Science Museum’s Marconi collection.

Virtual experiments you can try yourself. As restrictions ease we shall be inviting you to have a go in the laboratory!

The exhibition is housed inside a 1968 Morris Motor Traveller van built at the iconic Morris Motors plant in Cowley, Oxford. The objects an information available inside the van will evolve as the exhibition progresses… so just because you’ve seen it once doesn’t mean there isn’t more to see.

The Marconi Van project is a collaboration between the Institute for Digital Archaeology, the History of Science Museum, Oxford, Magdalen College, Oxford, Oxford’s Department of Physics, and the Guglielmo Marconi Science Park, in Santa Marinella, Italy.

Click here to check out this project and the display schedule.

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Radio Waves: Holme Moss Transmitter, Sherwood Tools, World of LPFMs, Shortwave Revival Response, and Russia “Thrown Back 40 Years”

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Radio Waves:  Stories Making Waves in the World of Radio

Welcome to the SWLing Post’s Radio Waves, a collection of links to interesting stories making waves in the world of radio. Enjoy!

Holme Moss transmitter (BBC Archives)

A look at how the BBC’s third television transmitter in West Yorkshire was built.

These original masts broadcast to the surrounding population until 1985, when they were replaced by a new generation of transmitters.

Originally broadcast 12 October 1951

Click here to watch the video at the BBC Archives.

Sherwood Tools Available (K4FMH Blog)

The work that Rob Sherwood NC0B has contributed to the public over the past decade is unique and an amazing service to hams worldwide. I’m talking about, of course, his summary Table of receive bench tests published at this Sherwood Engineering website. He is independent so no one can think that advertising dollars could skew his assessments or how he presents them. As a CW contest operator, he is very clear that he sorts his table on the basis of what his experience and training has shown him to be the single most important measurement in his table: the narrow dynamic range.

I am not a CW operator or accomplished contester (lol) but enjoy the latter with my small team of fellow hams. But I am a statistician who likes to focus on problems where analytic tools can help foster a wider understanding of the data surrounding the problem area. So, working with Rob NC0B, I’ve created a set of “Sherwood Tools” to visualize his data as well as link them to a couple of other critical aspects of a rig purchase: market-entry price, consumer satisfaction, and the year the radio entered the market. These four vectors of data drive all of these tools, now available over at foxmikehotel.com.

The tools include a sortable Sherwood list where you can sort on any of the nine tests he publishes as well as the composite index of them that I created and included in my two-part NCJ articles in 2021. A set of 3D data visualizations are available to simultaneously view radios on four data elements (that does make it 4D, technically). Several graphs illustrate key aspects of the data, including how to not get tripped-up in the “ranking” of radios where the bench measurements are just not appreciably different. Seeing how the past 50 years of radios appearing in Rob’s Table have made a remarkable and clear progression toward the best receiver performance that modern test equipment can detect is in another tool. In addition, how the trend in getting a receive bang-for-the-buck has progressed over this 50 year period is there, too. Finally, I’ve used the industry-standard tool by Gartner, the Magic Quadrant, to help isolate radios in Rob’s Table that perform and are rated above average at various price points. I call these the Golden Quadrant Lists. Continue reading →

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