Showing posts with label radio history. Show all posts
Showing posts with label radio history. Show all posts
Monday, September 21, 2026

Another Blast from the Past -- Dino KL0S in the early 70s -- A Turner mic, a Vibroplex, an HQ-100, a DC receiver, and a tech library.

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Dino:  Yes the parallels are really eerie OM.  There is that Turner mic.  I still have mine too, but I had to replace the element with an El...
1 comment:
Thursday, September 17, 2026

Grayson Evans' Modest Proposal: NO MORE VALVES! NO MORE TUBES! THERMATRONS FOREVER! (and a great video)

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First, a big THANK YOU to Grayson KJ7UM and to Zeynep, his wife and video editor.  The above video is a really excellent look at not only th...
4 comments:
Tuesday, September 8, 2026

Inside the NUVISTOR! Making a 555 Timer with Nuvistors!

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This video is very cool.  When I saw them crack open a NUVISTOR, I should have known that this was Eric from CuriousMarc.  And it is!    Her...
1 comment:
Tuesday, August 4, 2026

Soft Power and Shortwave Radio -- A BBC Program on the History of Shortwave Radio

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  https://shortwavearchive.com/archive/bbc-radio-4-the-sound-of-soft-power-may-23-2026 I was reminded that SolderSmoke Mailbag might have it...
2 comments:
Saturday, July 18, 2026

Why is AM on 3885 kHz?

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It is Saturday morning, 0500 EDT.  I am tuned to 3885 kHz, listening to the Old Military Radio Net.  It is on 3885 kHz.  Why this frequency?...
6 comments:
Sunday, May 3, 2026

Radio Receivers -- 1942 Training Film -- Crystal Sets to Superhets

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This 17 minute film provides a good but simplified description of the state of the art at the start of World War II.  --  The description of...
6 comments:
Saturday, January 3, 2026

More on Spark Transmission and Reception -- From Germany. Spark Transmission using a Piezo Fire Starter

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More spark today.  I really liked how Robert Dalby demonstrated spark transmission and reception.  He used a simple Piezoelectric flame star...
Friday, January 2, 2026

Spark Gaps and Coherers demonstrated and Measured by CuriousMarc

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CuriousMarc provides a good demonstration of how spark transmitters work with coherer detectors.  His measurements are really illuminating. ...
Thursday, December 25, 2025

Alexanderson Alternator on 17.2 kHz Copied by YO2DXE in Romania

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  On December 1st 1924, the 20kW Alexanderson Alternator with the call sign "SAQ" was put into commercial operation with telegram ...
Tuesday, December 9, 2025

"Homebrew you say? But did you DESIGN it yourself?"

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Raymond A. Heising  (1922) That is a question we get fairly regularly when we tell the other fellow that our rig is homebrew.  I often get t...
7 comments:
Tuesday, December 2, 2025

Grote Reber -- W9GFZ -- Radio Astonomy Pioneer, Homebrew Hero

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First off, what a great name. It is a real ham radio name.  Grote Reber.  And he was indeed a ham:  W9GFZ.    We don't have names like t...
5 comments: