Author Archives: Thomas

1976 U.S. Bicentennial Callsigns

Many thanks to SWLing Post contributor, Dan Greenall, who writes:

Hi Thomas,

In 1976, amateur radio operators in the United States were allowed the option of using a special prefix in place of their regular one to celebrate the country’s bicentennial year. Many amateurs issued special QSL cards for this bearing the new prefix, making reference to the US bicentennial year on the front.

Others simply modified their existing cards. The bicentennial commissions in Massachusetts and South Dakota even made up fill-in-the-blank commemorative QSL cards.

WL1CEN was a special events station in Lexington, Massachusetts, that appears to have been operating earlier in 1975.

The American Radio Relay League also issued a bicentennial WAS award to amateurs making contacts with all 50 U.S. states during 1976.

Here is a link to more bicentennial QSL’s

https://archive.org/details/ac-2-ghk-4-front

I wonder what’s going on this year, as I am not QRV at the moment?

73

Dan Greenall, VE3HLC

Alan Roe’s A-26 Season Guide to Music on Shortwave (version 3.0)

Many thanks to SWLing Post contributor, Alan Roe, who shares his A-26 (version 3.0) season guide to music on shortwave. Alan provides this amazing resource as a free PDF download.

Click here to download Music on Shortwave A-26 v3.0 (PDF)

Alan has also created at-a-glance, single-page PDF programme grids for BBC World Service, CGTN Radio, Radio Romania International, Voice of Turkey, and Radio Taiwan International — all updated for the A-26 broadcast season. If you’d like to download these, visit Alan’s Box account here: http://tinyurl.com/shortwaveprograms

As always, thank you for sharing your excellent guide, Alan!

This dedicated page will always have the latest version of Alan’s guide available for download.

The GPS Numbers Station: Hidden Encrypted Messages in Plain Sight

Image: NASA

Many thanks to SWLing Post contributor Scott Gamble, who writes:

Hi Thomas –

An interesting article was published in the most recent issue of Inside GNSS magazine that suggests that the US Military has been using an obscure field in GPS broadcasts to deliver encoded messages, potentially for use by intelligence agencies.

The article “The Empty Field That Wasn’t: GPS, OTAD, and Two Decades of Encrypted Messages,” by Steven J. Murdoch of University College London, is available via the link below:

https://lsc-pagepro.mydigitalpublication.com/publication/?i=865273&p=62&view=issueViewer

Scott

CHU Closure on June 22, 2026

Many thanks to SWLing Post contributor Dennis Dura, who shares the following article from Radio World about the impending shutdown of Canada’s iconic CHU shortwave time station.

We’ve covered CHU’s imminent closure several times here on the SWLing Post, but this Radio World piece provides a particularly nice overview of the station’s history, purpose, and enduring significance to the radio community. It’s well worth a read, especially if CHU has ever been one of those familiar signals on your dial.

Read the article here:
https://www.radioworld.com/news-and-business/headlines/canadas-chu-shortwave-time-station-to-be-silenced

Shortwave Memories — World Radio-TV Handbook

by Karl D. Forth

Reading through the 1971 World Radio-TV Handbook only as a reference source was interesting, but as I started listening more I also realized I felt part of what was happening – I could hear many of the countries described, one way or another.

I’ve always liked directories. You can often learn more of what’s happening than you can in a textbook.

The 25th edition of the directory of international radio and television was published in 1971 in English in Hvidovre, Denmark, and printed in Great Britain.

Looking at the information, organized by continent and country, you discovered that most European countries had a domestic network of AM and FM stations, including some very high-powered AM stations, along with domestic shortwave services and a full complement of what were called foreign services, the international broadcasts.

In Africa, many listeners got their news from domestic shortwave broadcasters and some AM stations. In 1971, FM had not penetrated Africa except in a few places. Likewise, Asia had few FM broadcasters outside of Japan and a few other countries. All domestic broadcasts in Indonesia, for example, were on shortwave, there was no AM broadcasting at that time.

I counted almost 75 advertisers in the 1971 WRTH, including many shortwave stations and makers of professional recording and studio equipment.

Advertisers included Radio Moscow, Shure stereo cartridges, Voice of America, Radio RSA from South Africa, Radio Sweden, Continental Electronics, Hallicrafters, a Chicago area maker of shortwave radios, and Hammarlund Mfg. Co., a maker of top-line receivers.

WRTH also had the music signature and description of the interval signal for dozens of stations.

The United States listing in WRTH had only AM mediumwave stations with more than 10 kW, and no FM stations listed. Also included were Voice of America, and shortwave stations AFRTS, KGEI, WNYW, and WINB.

Central and South America still had a bounty of mediumwave and shortwave stations, including many smaller private stations

More than 23 countries were listed with DX programs. WRTH also listed time signal stations (almost every major country had one) and programs in Esperanto. TV had not achieved widespread coverage in many areas, although most countries had at least a few over-the-air channels.

I should mention two other publications from 1971, both well-written and informative. The first issue of Communications World in 1971, from Davis Publications, was written by Don Jensen and was a great introduction to the hobby. That same year, Communications Handbook, published by Popular Electronics, came out, with a mediumwave and shortwave DXing overview written by Richard Wood that also featured very good descriptive writing and information.

Karl D. Forth has been interested in radio and DXing for more than 50 years. This story was included in the book Radio Nights and Distant Signals.

Karl D. Forth has been interested in radio and DXing for more than 50 years. This story was included in the book Radio Nights and Distant Signals.

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24 Hours of Le Mans 2026 Special Event

Photo by lamnatheshark

Many thanks to SWLing Post contributor, Paul Jamet, who shares the following announcement:

24 Hours of Le Mans 2026

During the legendary 24 Hours of Le Mans Automobile race, the amateur radio operators of the Sarthe Radio Club F6KFI will be in the spotlight!

To celebrate the legendary 24 Hours of Le Mans, the amateur radio operators of the Sarthe Radio Club F6KFI will be in the spotlight!

From May 30th to June 14th, 2026, they will be activating the special callsign TM24H.

Operations will be available on numerous bands and modes:

    • SSB
    • CW
    • RTTY
    • PSK
    • FT8
    • VHF & QO-100

A great opportunity for all radio enthusiasts to connect with this special activation and celebrate one of the world’s greatest motorsport events together!

Tune in, stay tuned… and happy TM24H hunting!

Radioamateur #LeMans #24hDuMans #HamRadio #TM24H #F6KFI

Another URL: https://www.24h-lemans.com/en