Category Archives: Radio History

Radio Botswana, 1987 Style

No seasoned shortwave DXer can forget one of the most distinctive interval signals ever–the “barnyard animals” which marked the beginning of the broadcast day of Radio Botswana, Gaborone, for decades.

On its long-time frequency of 4820 kHz, Botswana was an occasional catch for me from the Seattle USA area. I yearned for clearer, more reliable reception of this station and other Africans which my East Coast USA DXer pals enjoyed!

Zebras mingle with other animals at Chobe National Park, Botswana.

Zebras mingle with other animals at Chobe National Park, Botswana.

It was always fun–and a DXing challenge–to catch Radio Botswana’s interval signal and sign-on announcements, but it was typically mid winter for reception in Seattle. Propagation on 60 meters needed to be favorable to enjoy anything other than a weak, barely listenable signal. Imagine my surprise and excitement when on the evening of December 27, 1987 I came upon the following signal booming in on 4820 kHz, far, FAR better than any previous Botswana reception. Indeed, their signal that evening surpassed in clarity even the Papua New Guinea and Indonesian “regulars” I would hear on the tropical bands from the Northwest USA.

Audio Player


This recording begins with the famous barnyard animals interval, the beautiful Botswana national anthem (Fatshe leno la rona, or This is Our Land in English) and is followed by a full list of broadcasting frequencies and times in English and the (presumed) Setswana language. That information is followed by a flute instrumental version of the Christian hymn Beautiful Savior, which introduces a short devotional or scripture message. The 10 minute recording wraps up with an a cappella children’s choir.

Great Circle route from the Gaborone transmitter to Seattle receiver location.

Great Circle route from the Gaborone transmitter to Seattle receiver location.

My receiving setup for this 1987 recording was an ICOM IC-R70 and a 300 foot long random wire antenna. Such a long antenna is unusual for the middle of an urban area, but I took advantage of living in a 3rd floor apartment across from a small city park. One midweek day, while most folks were at work, I managed to string out this long antenna with very small diameter braided steel wire from the 3rd floor apartment balcony to a distant treetop. This “sloper” antenna had significant directivity to the northeast, which happens to be the bearing for many African stations heard from the Pacific Northwest USA. The small diameter wire was suspended so high that it was virtually invisible from ground level.

Antenna orientation for 1987 reception of Radio Botswana. I'm sure this urban location is plagued by QRM and radio frequency interference now in 2016! My ICOM IC-R70 receiver handled the strong signals from nearby MW & FM broadcasters surprisingly well with the addition of a Grove Tun3 Mini-tuner preselector.

Antenna orientation for 1987 reception of Radio Botswana. I’m sure this urban location is plagued by QRM and radio frequency interference now in 2016! My ICOM IC-R70 receiver handled the strong signals from nearby MW & FM broadcasters surprisingly well with the addition of a Grove Tun3 Mini-tuner preselector.

I continued to log Radio Botswana occasionally on 60 meters until the station eventually left the air (early 2000s I think), but I never heard them again with such a strong, clear signal as in late December 1987!

Guy Atkins is a Sr. Graphic Designer for T-Mobile and lives near Seattle, Washington.  He’s a regular contributor to the SWLing Post.

Shortwave Radio Recordings: KNLS test transmission circa 1983

A.4towers3antennas

We’ve just posted yet another excellent recording by Tom Laskowski to the Shortwave Radio Audio Archive. I thought a number of Post readers might appreciate this one.

Tom notes:

KNLS – Anchor Point, Alaska, from what I believe is a test transmission on August 1, 1983. According to Wikipedia, KNLS signed on the air July 23, 1983. The program consists of the sign-on ID in English and Russian then is mostly a mix of Big Band music. This recording is 31 minutes long.

Tom’s receiver was a Sony ICF-2001 and he started recording at 09:00 UTC on 11.820 MHz. His location, at the time, was South Bend, Indiana (USA).

Click here to download the recording as an MP3, or simply listen via the embedded player below:

Audio Player

You can listen to more archived shortwave recordings at the SRAA website, or by subscribing to the audio feed via iTunes. You can also listen to the archive on TuneIn radio.

Shortwave Radio Recordings: Radio Netherland’s “What’s New” circa 1976

Paul's 1976 tape reel containing this Radio Netherlands recording. He felt the DeLorean added a touch of time travel.

Paul’s 1976 reel containing this Radio Netherlands recording. He felt the DeLorean added a touch of time travel.

We are fortunate to have a number of active contributors to the Shortwave Radio Audio Archive who have dusted off old magnetic tapes and digitized them for all to enjoy. One such contributor is Paul Harner, who has submitted a number of recordings the past few months. Paul recently submitted a 1976 recording of What’s New from Radio Netherlands.

Paul notes:

Radio Nederland’s “What’s New” was a Saturday night program that featured hits from the weekly Dutch Top 30. The show was co-hosted by American Bruce Parsons and Australian Graham GIll. Based on the charts from that week, this show aired on 6 November 1976. Shows like “What’s New” introduced me to pop/rock artists that didn’t receive airplay in the USA. It also introduced me to other shows on Radio Nederland later on, such as “His And Hers,” “Happy Station,” and especially “Media Network.”

I imagine a number of SWLing Post readers remember listening to What’s NewClick here to download Paul’s 1976 recording, or simply listen via the embedded player below:

Audio Player

1953 film anticipates the transistor’s impact on technology

TheTransistor-Film

Many thanks to an SWLing Post reader who shared this brilliant 1953 documentary film about the anticipated impact the transistor could have on technology.

Here’s the film description from the AT&T YouTube channel:

Made between the 1947 invention of the transistor at Bell Labs and the 1956 awarding of the Nobel Prize for Physics to its creators, this documentary is less about the discovery itself than its anticipated impact on technology and society. The intent of the film was clearly to give the public of that era their first understanding of what a transistor was and why it mattered so much.

Made for a general audience, the film provides a clear and concise presentation on technological developments that began with the vacuum tube, showing different types of transistors and explaining the significance in their ultimate replacement of tubes.

Included are visions of “things to come,” concepts and creations of how the small transistor might free up an encumbered world: the wrist radio, similar to Dick Tracy’s, but with a cool lapel sound speaker worn like a boutonniere; a portable TV set, which must have seemed astonishing at the time given the huge, heavy cabinetry required to accommodate the plethora of tubes inside 1950s TVs; and the “calculating machine,” or computer, whose size, we’re told, will one day be so reduced because of transistors that it will only require “a good-sized room” rather than a space the size of the Empire State Building. The concept of how small computers could be still remained decades away.

While The Transistor’s vision of the future seems somewhat quaint in retrospect, it captures a moment in time before the transistor became ubiquitous; a time when Bell Labs wanted the world to know that something important had occurred, something that was about to bring tremendous change to everyone’s daily lives.

Click here to view the film on YouTube, or simply watch via the embedded player below:

WWII Correspondence Collection highlights POW radio letters

Atwater-Kent-Dial

Many thanks to SWLing Post contributor, Richard Cuff, who shared the following article via the Winter SWL Fest email group:

(Source: Ithaca.com)

He Got News to Families of POWs

The word “archives” can conjure up an image of dusty boxes of documents and sepia photographs. Do not be deceived. In fact, the files in the Tompkins County History Center Archives are filled with stories and all manner of tantalizing clues and evidence about the lives of those who came before us. And in the hands of Archives Director Donna Eschenbrenner—knowledgeable, helpful, ever eager to assist—those files can come alive.

Such a collection is file V-63-7-6, the ‘Meredith Brill WWII Correspondence Collection. In early 1944 15-year-old Caroline resident Meredith (“Bub” to his family) Brill was a shortwave radio enthusiast. What made Brill remarkable is that he was able, with his radio, to get information from Nazi-occupied Europe thousands of miles away, about American servicemen who had been taken prisoner by the Germans. He wrote the names, ranks serial numbers and home addresses down, and then sent letters to the families of the prisoners. He wrote dozens of such letters. The archives file is comprised of thank-you letters from those families, Brill’s notebooks and some of his letters that were returned unread.

His own letters are extraordinary. They are simple without being blunt, and his all-caps typewritten directness doesn’t disguise the very human impulse to ease a family’s anxiety. “I hope this information will be of help to you because I know many parents worry a great deal about their sons and daughters in the service.”

Shortwave radios captured the imagination of a lot of young people in those days. The technology has been called the “first internet.” A shortwave radio uses frequencies just above the medium AM broadcast band, and it can be used for very long distance reception by means of “skip propagation,” in which the radio waves are reflected back to earth from the ionosphere. It allows communication around the curvature of the earth. Sound quality can vary greatly, and it depends on the season and time of day, but you can hear broadcasts from around the world. Generally, the signals are best at night.[…]

Continue reading at Ithaca.com…

Back in 2011, I posted a short review of Lisa Spahr’s book, World War II Radio Heroes, which also focuses on these amazing POW messages. Such a fascinating piece of WWII radio history.

Tubes and Valves: Dan’s research uncovers three vintage films

Hammarlund-SP-600

Many thanks to SWLing Post contributor, DanH, who writes:

I have been working on my Hammarlund SP600-JX-21 for the last two weeks. Results of the filter cap replacement were encouraging. I’m going after an AVC issue that is probably capacitor-related as well before doing a re-alignment with the signal generator.

All of this activity has turned my attention toward vacuum tubes. I found three vintage industrial films online that caught my interest…

The Mullard Radio Valve Company produced The Blackburn Story in 1962. The film was shot at what must have been close the peak of vacuum tube mass production. This presentation is unique in its finely detailed documentation of miniature tube construction. The hand labor required to build some of these tubes is incredible, considering it is a mass production operation. A surprising degree of automation is present for manufacture of some of the more popular tube types. The video resolution is not the best but I found myself ignoring this limitation after the film got underway. I have a few Mullard tubes in my tube boxes.

https://www.youtube.com/watch?v=GDvF89Bh27Y

Click here to view on YouTube.

Western Electric presents A Modern Aladdin’s Lamp (1940). This look at the electron tube is hosted by none other than Lowell Thomas. From the age of four pin and octal base tubes animation shows how tubes work.

Click here to view on YouTube.

Electronics at Work (1943) is a WWII offering by Westinghouse. The description of vacuum tube technology is a little more detailed and again animation is employed for visual impact. A variety of vacuum tube applications in industry and the military are shown from curing plywood to producing X-rays. The excellent animation was contributed by Famous Studios (when they weren’t doing the wartime Popeye cartoons).

https://www.youtube.com/watch?v=2eDb8ojvreo

Click here to view on YouTube.

Wow–thanks for sharing these excellent videos, Dan!

Hamvention Find: Rare Hallicrafters SX-11

Hallicrafters-SX-11 - 2

Yesterday, at the Dayton Hamvention Flea Market, a Hallicrafters SX-11 caught my eye. I don’t often see the SX-11 in such excellent shape. The seller wanted $500–quite steep for a flea market find.

Then I noticed a plaque on the side of the cabinet.

Hallicrafters-SX-11 - 5

This Hallicrafters SX-11 has been in the seller’s family since Bill Halligan himself gave it as a gift in the mid 1930s.

Hallicrafters-SX-11 - 4 Hallicrafters-SX-11 - 3 Hallicrafters-SX-11 - 6Hallicrafters-SX-11 - 1

This is what I love about the flea market–you never know what you’ll find.