Category Archives: Radio History

The 90 metre band – Then and Now

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Many thanks to SWLing Post contributor Dan Greenall, who shares the following guest post:

The 90 metre band – Then and Now

by Dan Greenall

A few decades ago, the 90 metre shortwave broadcast band used to be full of interesting and challenging-to-hear DX signals. In the 1974 edition of The Complete Shortwave Listener’s Handbook, author Hank Bennett reports on what you might expect to hear on these frequencies. There is a copy of this book on the Internet Archive.  Here is a link to that specific page.

Also, this sample page from White’s Radio Log in the 1972 Communications World magazine shows a number of stations that could be logged in 90 metre band.

Here are a few links to recordings from my personal collection that have survived through the many years.  These were all made between 3200 and 3400 kHz from my listening post in southern Ontario, Canada.

[Note: Click on each broadcast link to open the associated Internet Archive page with more info.]

Radio Bougainville, PNG 1971

Radio Rabaul, PNG  1971

Radio Santiago, Dominican Republic 1971

Radio Libertad, Santiago, Dominican Republic  1971

Action Radio, Guyana Broadcasting Service  1972

Radio Christian Voice, Zambia  1996

Malawi Broadcasting Corporation (MBC)  1997

Radio Maya TGBA, Guatemala  early 1970’s

Radio Exitos, Dominican Republic  1971

Today, it seems that only a handful of stations can be found broadcasting in the 90 metre band.  These would include WWCR in Nashville, the Voice of Indonesia, KCBS Pyongyang and Radio Mosoj Chaski in Cochabamba, Bolivia.  As well, the Canadian time signal station CHU still continues to use 3330 kHz.

A recent recording of Mosoj Chaski Radio, a Christian broadcaster logged using a remote SDR in Lima, Peru, is presented here.

Although not in English, listen carefully and you can hear them give their frequency of 3310 kHz in the 90 metre band as well as their location of Cochabamba, Bolivia.

Australia Solved Remote Learning Seventy Years Ago—with Shortwave Radio!

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Many thanks to SWLing Post contributor David Iurescia for sharing the following article about one of my favorite topics, which we’ve covered in the past.

Long before Zoom classrooms or remote-learning platforms existed, Australia was already teaching across the outback via radio. This article from Education Daily explores how the School of the Air began in 1951 using shortwave radio and evolved into one of the world’s most advanced distance education systems—connecting students across half a million square miles.

It’s a brilliant look at how necessity inspired real innovation in broadcasting and education.

Click here to read the full article at Education Daily.

A Radio Postcard from Seoul

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Many thanks to SWLing Post contributor Mark Hirst, who shares the following guest post:

A Radio Postcard from Seoul

Hechi is a mascot for the Seoul Metropolitan Government

by Mark Hirst

I recently spent a very memorable week in Seoul, motivated to travel there by Hallyu or the Korean Wave, a cultural phenomena exemplified by the TV show Squid Game, animated movie K-Pop Demon Hunters, boy band BTS, and girl group Blackpink.

While I can credit Netflix and its huge library of Korean TV and film content for introducing me to K-drama, it was KBS World Radio and its Weekend Playlist programme on shortwave that led me to K-pop.

Early on in my holiday planning, I discovered that KBS has a public exhibition called KBS ON located in their headquarters building. Later during the trip, radio would appear unplanned in one of the other museums I hoped to explore.

Travelling to Seoul of course was a unique radio listening opportunity to hear and record stations that would otherwise require a Web SDR or internet streaming. Armed with a relatively recent copy of WRTH, I was able to compile a list of radio stations with the intention of making some short audio and video recordings.

What follows is a description of my experiences at KBS ON, some historical references to radio at the National Museum of Korean Contemporary History, and notes about the radio stations I was able to hear during my stay.

All photos are my own.

The Korean Broadcasting System

The Korean Broadcasting System or KBS is the national broadcaster of Korea, providing radio, TV, and internet based content to its national audience. KBS World is the outward facing arm of the organisation providing similar services to an international audience.

The headquarter buildings of KBS are located in Yeouido, an area of Seoul that also hosts Korea’s National Assembly Building. Technically a river island, Yeouido is bordered by the Han River, offering spectacular views of central Seoul and a skyline familiar to K-drama fans everywhere.

The main KBS building is a short walk from Yeouido station on Line 5 and Line 9 of the Seoul metro system. Your route takes you through Yeouido Park where you can see a preserved Douglas C-47 cargo plane dating from the Korean War.

The main building sits along side several other KBS related areas including the KBS Hall and KBS Art Hall. Even to the untrained eye, it’s obvious that the facility is communications related with a prominent red and white antenna tower on the main building, with red scaffolding on an adjacent block housing another tower and communication dishes.

Other notable locations at the site include a roadway and building entrance where K-pop idol groups arrive every Friday to record Music Bank, a programme that showcases the latest hits of the music genre. This photo opportunity is so popular with fans that it has a dedicated playlist on the KBS World English YouTube channel.

KBS ON Exhibition Hall

The KBS ON Mural featuring the mascot Kong

The KBS ON exhibition is part of a range of locations promoted by the official visitor guide to Seoul, details of which can be found here.

Accessing the exhibition is through distinctive blue bordered doors into a large reception area. The exhibition proper then begins at the top of a short flight of stairs.

Although all sections of the tour are in Korean, section overviews are also provided in other languages. QR codes link to audio commentaries to provide the remaining explanations for non-Korean visitors.

The audio commentary supports the following languages:

  • Korean
  • English
  • Simplified Chinese
  • Japanese
  • Bahasa Indonesia
  • Vietnamese
  • Spanish

The tour proceeds through a series of linked sections and topics which are described below.

KBS History

This section is comprised of information panels outlining the origins of KBS. Originally known as the Gyeongseong Broadcasting Station (callsign JODK) beginning in 1927, the name KBS emerges in 1945 following the liberation of Korea from Japan. KBS was established as a public broadcaster in 1973.

On Air

Through a series of large screens, this section describes the various channels KBS provides including terrestrial TV, international radio, cable, and Digital Multimedia Broadcasting, a radio transmission technology developed in South Korea.

Current Affairs / Culture programme

As a public broadcaster, this section highlights the current affairs and educational output of KBS.

Virtual Studio

This interactive section demonstrates the familiar ‘blue screen’ or chroma key technology used in news and weather forecasts. Visitors are encouraged to present their own Korean weather forecast!

Drama

The visitor is treated to a display of props and magnificent costumes from Korean period dramas, with panels and displays highlighting the role of KBS in driving growth in the K-drama industry.

Props and Costumes

Entertainment programme

Supported by large screens, this area showcases a range of local programming including talent and variety shows.

Music Bank

While the shows in the previous sections will be unfamiliar to most, Music Bank is more well known to overseas fans of K-pop. This high profile programme features live performances every Friday evening from the big names of the genre with a lottery system for fans to attend recordings.

Vertigo

This section demonstrates AI based technology developed by KBS to allow a single fixed camera to track individual members of an idol group simultaneously as they sing and dance on stage. Previously, these so-called ‘fancam’ shots required a separate camera for each performer incurring extra costs and logistics problems.

Examples of Vertigo in action are shown on large screens, featuring performances by girl groups STAYC and Illit.

Visitors can step on to a virtual stage adjacent to the displays where a single camera will automatically track your face and body without physically moving. Continue reading →

Vatican Radio – Then and Now

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Many thanks to SWLing Post contributor Dan Greenall, who shares the following post:

When I began shortwave listening back in 1969, Vatican Radio was one of the first stations I came across. That same year, the late Dr. Richard E. Wood authored a book called “Shortwave Voices of the World” in which he writes some notes about the station that you can read here [PDF].

In fact, Vatican Radio was established in 1931 by none other than Guglielmo Marconi. It wasn’t until sometime after World War 2 that the present-day transmitter site was set up at Santa Maria di Galeria. A nice view of it is pictured on this 1970 QSL card.

By the early 1970’s, short English language broadcasts to North America were still included in their schedule as you can see from these pages in the 1972 World Radio TV Handbook [click to enlarge].

In 1983, Ken MacHarg, a former host of the DX Partyline on HCJB, was the author of a now out-of-print book entitled “Tune In The World”. Read Ken’s comments about Vatican Radio here.

Though their published interval signal (see WRTVH) was “Christus Vincit”, Vatican Radio could also be recognized by the bells of St. Peter’s, which you will hear in this recording from 1971 that I made from my listening post in Ontario, Canada: https://archive.org/details/vatican-radio-1971

In more recent times, I have read that shortwave broadcasts to North and South America, as well as Europe, ended in 2012. In addition, English language shortwave transmissions to Asia ended in 2017, though they could still be found online. A list of their current English language broadcasts, as found on short-wave.info is shown here:

Here is a recording made August 11, 2025 using a remote SDR in the UK, complete with “Christus Vincit” interval signal, as they began their African service on 9705 kHz.

Also included is a recording from September 30, 2025, as they ended a transmission on 15595 kHz.

TWR Swaziland / Eswatini – Then and Now

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Many thanks to SWLing Post contributor Dan Greenall, who shares the following post:

Much to the delight of DXers, Trans World Radio began broadcasting from the African country of Swaziland over 50 years ago. According to the 1975 World Radio TV Handbook, they had four 30 kW transmitters to conduct initial testing in the 90, 60, 49, and 41 metre bands. Their interval signal, played on hand bells, reportedly comes from the song “We’ve a Story to Tell the Nations” and has a music box feel to it. It would pause frequently for an ID in English. This recording was made on November 2, 1996, on 4750 kHz just prior to 0400 UTC sign-on: https://archive.org/details/trans-world-radio-swaziland-1996

Today, the station is still on the air and follows the same format as in years past, except for the name of their country, which changed to Eswatini in 2018.

I chose a Kiwi SDR in neighboring South Africa to make this recent recording, on August 21, 2025 around 1359 UTC on 9585 kHz, leading up to the start of a program in the Portuguese language.

Nuts and Volts: FM Radio Arrives in U.S. Cars in 1958

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Many thanks to SWLing Post contributor Dennis Dura for sharing this fascinating Nuts & Volts article exploring the history of FM radio in American automobiles. While AM dominated dashboards for decades, FM began to make its way into U.S. cars in 1958, slowly changing how drivers listened to music and news on the road. The piece traces the industry’s hesitations, the technical challenges, and the cultural shift that followed. You can read the full story here:

FM Radio Reception Comes to U.S. Cars in 1958

Preserving Radio History in Your Community

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

I have lived in southern Ontario, Canada my entire life, have been DXing since the late 1960’s and have held the amateur radio call sign VE3HLC for over 50 years.  Most of this area’s AM broadcast stations had been considered “pests” over the years as I searched for more distant targets, until recently, when many of these began quietly slipping from the airwaves.  While this opened up some new frequencies to DX, I soon began to feel that I had lost some old friends, many that I had known since childhood.

When I retired in 2018, I decided to spend a little time trying to preserve some radio history of stations in southern Ontario communities that have played a part in my life. This might include audio clips, QSLs, station booklets, and other types of ephemera, and I would try to place this information where it could be easily accessed by future historians or anyone else who is interested.  In the end, I chose to use the Internet Archive (archive.org), where most uploaded information can be viewed (or heard) and downloaded for free.

CFPL, London, Ontario   980 kHz (still on the air)

“Communications in the Community” is a hardcover limited edition (2000 copies) souvenir book printed in 1966 by the Special Printing Unit of The London Free Press in London, Ontario, Canada.  It includes historical information about the London Free Press (newspaper) and CFPL radio and television.  I was lucky to find this item at a church rummage sale nearly 20 years ago.

CFPL began its life as CJGC in 1922. I acquired one of their QSL cards from 1925 through an eBay purchase a few years ago.

The above and more can be found by clicking on this link.

https://archive.org/details/page-16

CKOC, Hamilton, Ontario 1150 kHz (still on the air)

CKOC radio in Hamilton also started up in 1922.  My parents met while working at the station in the late 1940’s.  My brother and I (both radio amateurs), along with a few friends were given permission to operate on “Field Day” weekend in 1985 from their old abandoned transmitter site at Elfrida, Ontario.

This area has long since been developed to build homes and shopping areas.

“This is Hamilton, Ontario and the story of broadcasting station CKOC” is an undated booklet (I am guessing circa 1950) that I was able to purchase on eBay.  Also found on eBay were two verifications, one from 1931 and the other from 1983.

You can find these scans and more by following this link.

https://archive.org/details/page-13_202209

CKNX, Wingham, Ontario 920 kHz (still on the air)

This station began in 1926 using the unusual call sign 10BP.  It would remain that way until 1935.  I managed to secure this QSL from 1932 through eBay, signed by its founder W.T. “Doc” Cruickshank.

Interesting stories of how the station began can be found at this link.

https://www.communitystories.ca/v1/pm_v2.php?id=story_line&lg=English&fl=0&ex=386&sl=2541&pos=1&pf=1

CKCR, Kitchener-Waterloo, Ontario 1510 kHz  (no longer on the air)

In 1924, this station began briefly in nearby Brantford, Ontario. It quickly moved to Kitchener-Waterloo and existed until 1965 when it became CKGL.  The CKCR call sign was picked up later in 1965 by a station in Revelstoke, BC.

Another eBay purchase, I found this QSL with a not-to-scale map of southern Ontario from 1934.

More Ontario QSL’s can be found in my broadcast band gallery at this link: https://archive.org/details/ckoc-hamilton-on-1983

I would encourage others to save parts of the local radio history in their city, state, province or country and give back to the hobby that we have enjoyed for so many years.   I would also be happy to hear about any efforts you have made!