Category Archives: Shortwave Radio

Time station CHU in The Empire Strikes Back

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Earlier today, I published a post noting that I thought I heard the time station WWV in a scene of The Empire Strikes Back.

SWLing Post reader, RadioGeek, quickly corrected me: that’s Canadian time station CHU‘s data pips I’m hearing, not circa-1980s WWV.  Cool!

Listen for yourself

Here’s the clip from The Empire Strikes Back, Battle of Hoth

Now listen to the recording of CHU I made only moments ago–note the tone and duration of the data pips:

No wonder I mixed up CHU and WWV; I’ve listened to both for propagation since I was a kid.

I wonder which of the Lucas Film sound engineer(s)/artist(s) chose CHU for this scene? Anyone know, by chance? Or can anyone find out?

No doubt, that sound designer is an SWL or ham radio operator. Perhaps this may also explain the SSB-esque radio dialog between fighter pilots throughout the Star Wars films:

Please comment!

Jonathan shares archived Media Network Christmas and New Year shows

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Many thanks to SWLing Post contributor, Jonathan Marks, who shares the following from his Media Network Vintage Vault.

Jonathan writes:

“Picking up on the idea of revisiting archive Christmas and New Year shows, here are some from Radio Netherlands for the SWL Blog.

Seasons Greetings, Jonathan”

Media Network 26.12.1996 Boxing Day Show

A radio Christmas spent in the Media Network studio way back in 1996. Sounds like we were having fun! I look back on this period as perhaps one of the golden years for Dutch external broadcasting, producing a range of documentary productions in English and Spanish and recording great concerts, both classical and jazz.

This programme focussed on answering listeners’ letters on subjects like satellite television in Australia (DW was organising a bouquet of signals) and the major changes to the commercial radio scene in New Zealand. The auction of FM frequencies in the Netherlands and shortwave stations that sold radios were also topics for discussions. RBI archives have, for the most part, been destroyed. Swiss shortwave listeners were quizzed on their listening habits. The 410 ft tower formerly used by AFN has been dynamited out of existence. Capital Radio in South Africa is in trouble.

MN.28.12.1995 Rhodesia – Answering Back From Francistown

I met the late Harold Robin a couple of times at his home in Tunbridge Wells, UK. He was a brilliant Foreign Office engineer who built the wartime Aspidistra transmitter famous for its clandestine work out of Crowborough. Have a listen to the programmes Wartime Deception and you’ll see what I mean.

Although his work during the war is well documented in books like “The Black Game”by Ellic Howe, I think we managed to capture the other stories from later in his life. For instance, how he invented the “Picolo” modulation system as used by the diplomatic service to communicate text over shortwave between embassies. He also built the BBC Overseas relay station in Oman, and the external service of UAE Radio from Dubai. This edition, recorded after Christmas in 1995, looked at the story of the British response to the declaration of independence by Ian Smith in, what was then, Rhodesia. Harold talks about setting up a mediumwave transmitter in a matter of weeks in the town of Francistown, in the Bechuanaland Protectorate, now called Botswana. Thanks also to Colin Miller for some of the recordings of the RBC. It seems that one of the two transmitters was sent to Cyprus after the World and Rhodesia operation ended, the other ended up in Ordfordness for some experiments on 648 kHz. You might also want to check out the video of Margaret Howard, who refers to a special programme transmitted over this MW sender. It was called the World and Rhodesia and was more of a UK government editorial than any programme the BBC would make. The programme concept didn’t work although it seemed to have taken the British government a couple of years to find out. Harold refers to staying in the Tati Hotel River Lodge, about 8 kms outside of Francistown. Sure enough, it’s still there.

MN.23.12.1982: Christmas Review 33 years ago

I picked this recording out of the archives because it has a nice capsule summary of the major media stories from 1982. The highlight was, of course, the Falklands-Malvinas “conflict”. This programme contains clips from the FIBS, RAE Argentina and the BBC’s Calling the Falklands Programme. We also looked in some detail at the short-lived Radio South Atlantic which broadcast in May and June 1982 from a requisitioned BBC transmitter on Ascension Island. We asked the British Ministry of Defence to explain how the station was operated. We also analyzed a transmission broadcast on May 20th 1982 (the second night of transmission).

But it was also the last programme in which Wim van Amstel appeared as RNW Frequency Manager. It was certainly not the last time he was heard on the programme, though. Again it is striking to hear some of the predictions – and how they were spot on. The call with Arthur Cushen in New Zealand is rather like making contact with the moon. Cannot believe how fast time has flown.

At the time of publishing this podcast, I was also sad to hear of the passing of BBC correspondent and broadcaster Brian Hanrahan, who famous line when broadcasting under censorship from the Falklands Fleet was brilliant. Unable to reveal how many British aircraft had been involved in the conflict, he reported that after one sortie he “counted them all out and I counted them all back.

MN.26.12.1991.Year End Review

This was a news show 1.6 million tune in to Radio Netherlands in Dutch during their summer holiday. WWV and WWVH have had problems with their automated time announcements. Drum recorders are back on line. Victor Goonetilleke has news about Cambodia. VOA is having challenges building its transmitters at a new site 50km North of Colombo.

Why did we broadcast all these numbers? People forget none of the listeners had access on-line and only a fraction of the audience had access to printed DX bulletins. Andy Sennitt reports on what is in the 1992 World Radio TV Handbook. James Robinson reports that several UK local radio stations are leaving mediumwave. WLS 890kHz is scrapping its FM format. A new Catholic SW station WEWN was being built in Birmingham, Alabama. (The late) Dave Rosenthal reports on an experiment in McMurdo. Remember this show is 24 years old!

Vasily Strelnikov signs off at Radio Moscow World Service and recommends people to tune into Radio Netherlands. Radio Moscow staff watch the red flags of the USSR being lowered.

Thanks so much for sharing these, Jonathan–and Season’s Greetings to you!

I’m looking forward to several hours of listening over the coming days.

The Empire Strikes Back: Is that WWV I hear?

Fullscreen capture 12202015 40448 AMWith all of the Star Wars: The Force Awakens hype going on, I remembered that, as a kid, I thought I heard WWV in a scene from The Empire Strikes Back.

I looked through some video clips of the movie online and discovered it again this morning: I heard the WWV-like sound in the Battle Of Hoth scene. [Update: RadioGeek suggests this may actually be CHU’s date pips.]

This video clip will start around the :23 second mark; start listening for the metronomic tick in the background around :25 seconds and then again at :40 seconds:

I may be mistaken, but I believe that sounds like 1980s era WWV. Has anyone else noticed this?

Looking for SWLing Post gear? We’ve got you covered!

Over the years, readers have often encouraged me to create SWLing Post shortwave radio-themed products, which is to say, t-shirts, coffee mugs, and the like. But for some reason, I’ve never gotten around to it.

That is, until now…

SWLingPost-DXFiend-Vintage-Front

What finally motivated me to create these items is a friendship:  I’m fortunate to number among my friends the amazingly talented Jeff Murray (K1NSS) of Dashtoons.  It occurred to me that I might commission Jeff to design some shortwave radio-themed graphics that represent the broad spectrum of radio enthusiasts here on the SWLing Post. Jeff, ever enthusiastic where radio is concerned, was the perfect artist for the job–particularly since he and I see eye-to-eye on the beauty of both radio innovations and radio nostalgia.  And with Jeff’s quirky sense of humor to enliven his sharp, dapper graphics, the great results you see here were simply inevitable.

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Of course, his pictures speak louder than my words.  As I’ve said, Jeff’s clearly a graphic artist par excellence, and it certainly doesn’t hurt that he really knows radio–inside and out.

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While he was at it, Jeff created an SWLing Post logo that will soon accompany a refreshed Post design I’ve had in the works…stay tuned for that as the new year approaches.

SWLing-Post-Women's-T-shirtIn the meantime, I thought I’d share a link to a simple CafePress webstore I’ve put together for our newly-minted swag.

Click here to view great SWLing Post gear.

So far we only have a few select items on offer, but I’ll soon be adding more. But we do have two great t-shirt and coffee mug designs available now:  the Radio Waterfall design features the SWLing Post logo superimposed over a blue SDR waterfall, with the words “DX FIEND” emblazoned beneath; the Radio Nostalgia design features the above vintage-style radio image, with”DX FIEND” beneath, and the “SECRET WORLD” image on the back. Take it from me, they look great.

Let me know if there’s something in the CafePress catalog you’d like to own featuring Jeff Murray’s terrific radio art, and I may be able to put it out there for you.

SWLingPost-Shirt-FrontOh, and by the way–a small percentage of your purchase (typically between $2.00-4.00US) goes towards keeping the SWLing Post online. The rest of the cost goes to CafePress’ product base price. True, I doubt we’ll ever sell enough to break even this way, but who cares…! After all, I do all this for fun, not profit.

Plus I confess to a little personal motivation: I really wanted a Jeff Murray-designed mug for my own cuppa joe!

The great thing about CafePress–although slightly pricey for some items–is that they offer great products, great customer service, and a no-questions-asked return policy. I like that.

large_mug_sdr_waterfall_mugsSo, if you take a leap of faith and purchase one of our items, please comment and let me know how you like it!

Side note: If you ever need amazing custom artwork for your QSL cards, your company, or your shack, I highly recommend Jeff Murray. He worked with me over the course of a week to nail down these incredible designs, and wowed me with his powerful creativity every step of the way.  It was worth every single penny and more, and an honor to work with him, which is why I hope to have him create even more artwork next year! Thanks, Jeff!

And thanks to our Post readers for your purchase!  Go ahead–join me in a hot cuppa!

Icom IC-R72: a repair story

Icom-IC-R72-Front-Mehdi-AsgariIn this post I’m going to tell you how I repaired my Icom IC-R72 receiver. Although it’s about a specific device, the logic and methodology applies to all radios.

I bought an Icom R72 from a friend for about $200. At first, I just checked 7.0MHZ (40 meter band) and 21.0MHZ (15 meter band) and it was OK. After some time, I tried to listen to some ham radio on 20 meters (14.0MHZ) and it was deaf! I checked everything: antenna connectors, balun…everything.

With some trial and error, I found out that it was deaf from 11-15 MHz. With the help of the members of “Icom R72” Yahoo Group, I found one of the usual suspects: bandpass filters’ switching diodes.

I took a look at the service manual and apparently this radio uses multiple bandpass filters  for different  frequency ranges.

Schematic-Icom-R72-1

As you see in the above picture (grabbed from service manual), one of the bandpass filters is for 11-15 MHz range–that’s the range where my radio was deaf.

Note that there are multiple ways to test that a radio is deaf at a frequency. One of the simplest ways: connect an antenna or even a long wire to the antenna socket of radio. The noise level should increase; if not, there’s a problem.

Schematic-Icom-R72-2

After testing diodes with a multimeter, I found out that D31 is faulty. Almost all multimeters have a diode-test functionality.

I replaced it. The original diode was 1SS53, but I used a 1N4148 which is very common and found everywhere. Now I have a working radio! 🙂

If you have a radio that’s deaf at a frequency range, there is probably a problem in bandpass filters.

Here are some internal pictures of my Icom IC-R72:

IC-R72-Internal-IF-Stage-Mehdi IC-R72-Board-1 IC-R72-Board-2 Icom-IC-R72-Open

I should thank my friend and electronics mentor, Saeed (EP2LSH) who always helps me in my electronics adventures.

Mehdi Asgari, the author of this post, is a regular contributor to the SWLing Post. Mehdi lives in Tehran and is an active member of the EP2C amateur radio club.

1989 RCI Christmas Special: a studio recording

UK-DXer-RCI-QSLMany thanks to Colin Newell who writes:

Over on the DXer.ca homepage I have a 32kbps MP3 recording on a CBC RCI broadcast that has not been heard since December 1989! A 1 hour program from the Reel-Reel master that Ian McFarland owns.

Head on over – download for free –

And Merry Christmas!

What a great early Christmas gift for those of us who miss the Ian McFarland days of RCI.  Thank you, Colin!

Click here to visit DXer.ca.