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...
Sunday, July 19, 2026

137 Direct Conversion Receivers -- Recently Built in Bandung, Indonesia. But none in Japan, None in China, None in Africa, and only 1 in all of Latin America!

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RX built in Bandung Indonesia -- Andri used an AF transtormer from an old Japanese receiver.  Why have NO receivers been built in Japan?   A...
5 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:
Friday, July 17, 2026

How Were 3.579 MHz Crystals Used in Color Television Sets?

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Gemini explains:  In NTSC analog color television, the 3.579545 MHz crystal was the heartbeat of the entire color decoding system. Its prim...
1 comment:
Thursday, July 16, 2026

The 43.333 MHz Crystal in my Nuvistor Converter was Bad. But WHY did I Find Another One in my Junkbox?

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Gemini explains why:  As a radio amateur, you have likely run across these crystals in countless parts bins, swap meets, and vintage schemat...
8 comments:
Wednesday, July 15, 2026

The Smith Chart -- Veritasium Explains its Origins and How it Works

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This is really interesting and represents one of the best explanations of the Smith Chart that I have seen.   One quibble:  In the beginning...
7 comments:
Tuesday, July 14, 2026

A Nice Workshop (With The Logical Song)

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2 comments:
Sunday, July 12, 2026

How to Build a MODERN Electronics Workshop (and How Much it Might Cost) (PLEASE COMMENT)

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First, kudos to this fellow for pronouncing "solder" correctly.  The L is silent (sorry to our British readers).  He does have an ...
4 comments:
Saturday, July 11, 2026

My Parks 2 meter Nuvistor Converter, a QST review, and Bio Info on the Tektronix Hams who Designed It (Who is W7UHF now?)

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  Denton E. Nelson (amateur radio callsign W7UHF ) was an electronics engineer and a notable figure in mid-century amateur radio history, be...
3 comments: