Tuesday, October 31, 2023

Building a Crystal Set (Videos)

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Andreas DL1AJG in Germany sent the above video to me.  Andreas is the fellow who ran the course in which his university-level students built...
1 comment:
Sunday, October 29, 2023

Apollo Core Rope Memory -- CuriousMarc Takes it on (video)

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Here is another amazing Apollo video from CuriousMarc (AJ6JV).  Thanks to Bob KD4EBM for alerting me to this.  We have recently been discuss...
Saturday, October 28, 2023

Mattia Zamana's Amazing Direct Conversion Receiver

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Thanks to Ed KC8SBV for sending me this awesome video.  It looks like Mattia built this receiver way back in 1995.  The tuning indicator is ...
7 comments:
Friday, October 27, 2023

A NETFLIX Series with Boatanchors and Direction-Finding -- All the Light We Cannot See

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Looks good.  November 2, 2023. 
1 comment:
Monday, October 23, 2023

Bringing a Faulty Herring Aid 5 Receiver Into the Light -- Fixing the AF Amp Schematic Error (video)

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I picked up this old homebrew receiver in March 2023 at the Vienna Wireless Society's Winterfest Hamfest.  It is a Herring Aid 5.   I wa...
6 comments:
Sunday, October 22, 2023

DIAL SCALE LINEARITY -- Spreading out the Frequencies for the 15-10 BITX Rig

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Click on the image for a better view The 15-10 Rig has been performing very well, pulling in a lot of DX contacts on both bands.  But there ...
3 comments:
Thursday, October 19, 2023

How a Homebrewer Substituted MPF102s for the RS 2035 FETs in the Herring Aid 5 -- Who built this one? Any others out there?

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The Hamfest Herring Aid 5 For background on all this, see yesterday's blog post:      https://soldersmoke.blogspot.com/2023/10/a-big-err...
6 comments:
Wednesday, October 18, 2023

A Big Error Discovered in the 1976 QST "Herring Aid 5" Article (After 47 Years)

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Click on image for a better view.  See arrows for Q1, Q5 and the parts list. I tried as a teenager to build the Herring Aid 5 direct convers...
7 comments:
Monday, October 16, 2023

Does Matching Matter? (Diode Matching for Diode Ring Mixers) -- Nick M0NTV Finds the Answer (Video)

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I n this video, Nick M0NTV takes on a hot topic in ham radio homebrewing:  The matching of diodes in diode ring mixers.   How should the mat...
6 comments:
Sunday, October 15, 2023

Spy Rigs, Para Sets, Bugs, and Enigma Machines -- Dr. Tom Perera W1TP (video)

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This is a really amazing presentation by Tom Perera W1TP to the Fairlawn (NJ) Amateur Radio Club.  There is so much great info in this prese...
Saturday, October 14, 2023

Paul VK3HN's Video on Scratch-Building and SOTA

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It was great to get a comment from Paul VK3HN -- this led to a re-establishment of contact.  Apparently Google knows who I have been e-maili...
Wednesday, October 11, 2023

Sunburst and Luminary: Apollo "Rope" Memory, and other items of interest

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  Wow.  That is the method that they stored computer memory for the moon missions.  When they were satisfied with a program they would say i...