Bill and Pete:
Thanks for upping the frequency of your podcasts. Each one is a welcome note to break-up the COVID monotony.
Following on to Bill’s 31m rx, I am pleased to have a new regen on the air and performing well. This started as the 12AU7 Hartley circuit found on the web; however, the original circuit needed some further work IMO. I made a number of modifications – outboard 30 MHz LPF (to remove our local Spanish FM station), inductive antenna link, variable cap for antenna coupling adjustment, up to 24V on the plate, extra by-passing, NE5532 audio section vs LM386 and a switched cap for a lower “band”. It’s still a starved triode oscillator/audio amp and it has that regen presence. Best DX is Singapore (BBC) and Madagascar although it’s ideal for easy listening on 19-60m to Romania, Greece, Cuban music, Spain, etc. As Bill said, there is still plenty worth listening to on a homebrew AM rx. 40, 30 and 20m copy OK, but bandspread is tricky! Adjusting regen is good for +/- 1 kHz, kind of a poor man’s BFO adjustment. I heard a TI station calling CQ on 20m and called him back on my Icom for a QSO.
By the way, this rx has some serious vintage mojo – Hammarlund varicap, National coil form, Millen dial and an RCA tube. The all-star team plays great together! It’s a kick seeing the filament glow while putting RF through recycled parts made decades ago.
73,
Chuck
KE5HPY
Very nice looking receiver. Good job!
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