Serving the worldwide community of radio-electronic homebrewers. Providing blog support to the SolderSmoke podcast: http://soldersmoke.com
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Friday, February 13, 2026
The Mahbood Radio Service Company of Hyderabad, India
Thursday, December 25, 2025
Alexanderson Alternator on 17.2 kHz Copied by YO2DXE in Romania
On December 1st 1924, the 20kW Alexanderson Alternator with the call sign "SAQ" was put into commercial operation with telegram traffic from Sweden to the United States. 101 years later, the transmitter is the only remaining electro-mechanical transmitter from this era and is still in running condition. On Christmas Eve morning, Wednesday December 24th 2025, the transmitter is scheduled* to spread the traditional Christmas message to the whole World, on 17.2 kHz CW.
You can listen to the CW from Ciprian's setup above. I listened to it carefully and clearly heard the "KW ALTERNATOR" words at around the 3:30 mark in Ciprian's video. I wondered if this was in fact the SAQ Alternator (but then again, who else would be on 17.2 kHz on Christmas Eve?). I looked at the video from Sweden (below) at around the 49.37 mark we see the operator send "200 KW ALTERNATOR." Through Ciprian's video, I copied "KW ALTERNATOR." So Ciprian's operation was a success. Congratulations Ciprian!
Merry Christmas to all!
Wednesday, December 24, 2025
A VERY Interesting Old "Steam Punk" Homebrew Thermatron Rig -- Can You Suggest A Home for this Rig? (Video)
Monday, August 4, 2025
ElectroBOOM! CuriousMarc Tries (and fails) to fix an old HP182C Oscilloscope -- Words of Wisdom for all Homebrewers
It will be great to see, in subsequent episodes, how Marc makes it work. It is really great to see someone present an unvarnished view of how troubleshooting really works.
Thanks Marc. 73
Here is Marc's YouTube channel:
Thursday, June 19, 2025
More on Agent Sonya
I had completely forgotten that my blog had at least two posts on Agent Sonya way back in 2009. I know there is a lot of interest in her alleged radio derring-do.
Here are the two blog posts from 2009:
https://soldersmoke.blogspot.com/2009/08/sonya-had-knack.html
https://soldersmoke.blogspot.com/2009/09/sonyas-rig.html
And here is my 2025 post on Sonya:
https://soldersmoke.blogspot.com/2025/04/agent-sonya-did-soviet-spies-really.html
One friend recently mentioned that we have not seen any museum evidence of these kinds of homebrew spy rigs. If this really was a widespread practice, you would expect to find at least ONE of these rigs in a museum somewhere. Has anyone seen this kind of thing?
Here is something more recent about Sonya from the National WWII Museum in New Orleans:
https://www.youtube.com/watch?v=NU9-APiIUaQ
The Macintyre interview is really interesting. A friend told me that he is a very serious writer on the topic of espionage, whose assertions have to be taken seriously. For our purproses, here are some highllights:
22:18 Sonya goes through Soviet Spy School and is trained on how to build radios.
24:50 In China under Japanese occupation, had bamboo poles supporting antenna over her house!
25:40 Transferred to Switzerland, "built another radio."
34:18 Transferred to UK, built a "powerful radio transmitter in her loo."
51:41 Macintyre refers to Sonya as "the only Soviet radio operator in Switzerland."
So, I still don't know about the claim that Sonya was homebrewing radios. It does appear that Sonya was building them. But it also seems like she was more of a radio operator than she was a spy... Perhaps the Soviets didn't see the same distinction that we do. Still, it would be nice to find in a museum somewhere at least one example of Sonya-style homebrew radio.
Macintyre says that "all biography is burglary." What would autobiography be?
Thursday, April 17, 2025
"Seems Like Radio is Here to Stay" -- Old Radio, Radio Magic
The first 12 minutes of this podcast are pretty good. I think it captures well the wonder of radio -- magic carpets, signals taversing the Himalayas and all that -- but the presentation is kind of confused. The PRX podcasters keep saying that it was recorded in the 1930s, but then we hear references to the Nuremburg trials and the possibility of sharing the atom bomb. So there is some confusion in the presentation.
https://podcasts.apple.com/us/podcast/champions-of-old-radio/id453044527?i=1000702716017
Can anyone find the original recording from the 1930s about the wonder of radio, without the references to things that happened in the late 1940s?
Thanks to Rogier for sending this to me.
Saturday, February 15, 2025
Heard on the Old Military Radio Net: W4SVA
So there I was, early Saturday morning (earlier here -- we are one hour ahead of the East Coast) listening -- as I do -- to the Old Military Radio net. 3385 kHz AM. I use the K3FEF Web SDR in Pennsylvania. I heard a station that sounded familiar: Chris W4SVA. He said he was in the Shenandoah valley and was receiving on an R-390A and transmitting with a homebrew rig. I kind of remembered talking to a guy with a station like that. I searched through the SolderSmoke blog. No joy. Then I remembered it was probably a log entry. There he is, W4SVA. Here is his QRZ page: https://www.qrz.com/db/W4SVA I was almost certainly on the K2ZA DX-100.
Here's my log entry:
------------------
12 August 2018
75AM W4SVA Chris in the Shenandoah, 15 miles south of Harrisonburg. Very FB. AM guy. Building rack-mount rig. Lots of HB stuff. Sent him the Shenandoah rocket pictures.
--------------------
I also heard Buzz W3EMD from the Hudson Valley -- the dynamotor was clearly audible. FB Buzz.
Thanks Chris. And thanks again to John Zaruba for the DX-100.
Thursday, October 24, 2024
Mike WU2D Does a CCC Camp POTA with 1930's Gear
Friday, September 6, 2024
Ham Radio in the 1970s (and earlier, with some cool Jazz). What favorite rigs do you see?
Wednesday, July 10, 2024
Ham Radio Workbench: Stuffing Digital Stuff Into Poor Old Boatanchors
At one point they are laughing at old magic eye tubes! They wonder if there is a digital way of recreating this tube in digital form. Sorry fellows, that has already been done:
https://hackaday.com/2023/04/12/the-eyes-have-it-with-this-solid-state-magic-eye/
Even an analog guy like me spotted that one.
Here is the show:
https://workbench.libsyn.com/hrwb-213-radio-rejuvenation-with-dan-quigley-n7hq
But hey, like I always say: To each his own. I'm sure many people like this approach. It is just not for me.
Monday, May 13, 2024
Ragnar LA1UH's Wonderful Museums in Norway
Saturday, May 11, 2024
Jens OZ1GEO's AMAZING Radio Museum
Thursday, January 18, 2024
Some Great Reading Material -- Links to Radio Publications
Thursday, November 16, 2023
The Grid Leak Detector -- Follow-up from Yesterday's Post on the Whole Earth Catalog's "Hippy" One Tube Receiver
Friday, October 27, 2023
A NETFLIX Series with Boatanchors and Direction-Finding -- All the Light We Cannot See
Sunday, October 15, 2023
Spy Rigs, Para Sets, Bugs, and Enigma Machines -- Dr. Tom Perera W1TP (video)
Thursday, September 28, 2023
A Look at Old Radios in Australia (video)
I thought you guys would like Peter Parker's latest video. And in it, Dean KK4DAS might see a clue or two for his Halli restoration/repair project.
Saturday, August 19, 2023
Valveman -- The Story of Gerald Wells
Tuesday, July 4, 2023
A Very Early Radio-Controlled Device -- Using Spark and a Coherer, in Spain
The chess device was really interesting, but two things caught my eye about this fellow: 1) he lived and conducted some of his experiments in my old home of Bilbao, Spain and 2) he built a very early radio-control system that used -- in the receiver -- a coherer as the detector.
There is a lot material on Torres Quevedo. Here is just a sample of what is out there
His book: https://www.torresquevedo.org/revistas/index.php/BIB/issue/view/12/1. Discussion of the Telekino device is on pages 109-127.
The Branly Tube or Coherer: https://en.wikipedia.org/wiki/Coherer
https://en.wikipedia.org/wiki/Leonardo_Torres_Quevedo
https://cyberneticzoo.com/wp-content/uploads/2010/12/Telekine-Yuste.pdf
1903 article in Electron (Spain) about the Telekino and Coherers. https://hemerotecadigital.bne.es/hd/viewer?oid=0028654330&page=6
https://alpoma.net/tecob/?p=13766 This article contains the diagram of the device (see above). You can see the coherer with its tapper.




