Thursday, July 30, 2026

But did he really create this device? What do you think?

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A good friend, who was thinking very positively, sent me this video.  I looked at it, and concluded that while this fellow seems to believe ...
3 comments:
Wednesday, July 29, 2026

The Americium 241 Incident

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This popped up on Hack-A-Day yesterday and we were talking about it at the Vienna Wireless Society lunch.   Even if you find the topic to be...
Tuesday, July 28, 2026

Hidehiko JA9MAT's Self-Quenching Super-Regenerative Receiver from Japan -- AI Gets It Wrong!

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Updated image to show quenching Hidehiko reports that in Japan, this is called a "Self Quenching Circuit" and that it is popular w...
3 comments:
Monday, July 27, 2026

Understanding Super Regeneration (Good luck!)

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Edwin Armstrong presenting the superregenerative receiver at the June 28, 1922 meeting of the Radio Club of America in Havemeyer Hall, Colum...
3 comments:
Sunday, July 26, 2026

Helge LA6NCA Builds and Uses a Two Tube 80 meter Transceiver -- From Norway

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This entire video is really excellent.  Thank you Helge!  Once again, he shows us how to do it -- how to homebrew a useful rig, and how to p...
8 comments:

UK Homebrew VHF Matchbox Bugs

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There is a lot of interesting tech in these little boxes:   -- T he way they are powered (hearing aid batteries).  -- The way they are modul...
Saturday, July 25, 2026

Someone Else Used the FT-101 VFO Box -- JA9MAT in Japan

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Look at that!   The VFO from the venerable (1970s!) Yaesu FT-101 lives on, not only in Northern Virginia, but also in its country of origin,...
4 comments:
Friday, July 24, 2026

A Homebrew X-Ray Machine from North Macedonia

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It has been a long time since we saw anything like the X-ray machine described in CL Stong's classic book "The Amateur Scientist....
Thursday, July 23, 2026

A Homebrew Receiver from Hidehiko JA9MAT

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We recently complained that no SolderSmoke Direct Conversion receivers have been built in Japan.  So far, no Japanese SS DC Receivers have b...
2 comments:
Wednesday, July 22, 2026

Filters: Crystals, LC, Mechanical, SAW, etc.

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I thought this was an interesting look at filters and crystals.  And even mechanical filters.  Remember:  Those little SAW containers became...
6 comments:
Tuesday, July 21, 2026

VK3ACU Builds a Transmitter for 3.579 MHz

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Colorburst, my friends.  CBLA stuff from OZ.  A chip in the mix.  Thanks to Paul VK3HN for sending us this.  
1 comment:
Monday, July 20, 2026

Comments on the SolderSmoke Direct Conversion Receiver from Andri in Bandung, West Java, Indonesia

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Congratualtions to Andri, of Bandung, West Java, Indonesia.   Andri successfully built the SolderSmoke Direct Conversion receiver.  (See the...