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3Q4 1 tube Short Wave Receiver
   This radio is unique in the fact that it was modeled off Mike Peebles AC-100 1 tube regen.
but this one is for Short Wave. It's capable of receiving both the 40
and 80 meter bands and performs excellent! Some of the
modifications that had to be done were the main tuning coil, the main
tuning capacitor, and the trimmer capacitor. The plug in coil you
see is from Peebles Originals and can be swapped out with different
inductances to get different bands. The Main tuning capacitor had
to be dropped from the standard BCB 365pF to a 140pF. The fine
tuning capacitor is nothing more than a 15pF capacitor run in parallel
to the main tuning capacitor. The tube is a 3Q4 and can run on
anything from 18v to 45v. I opted to run it of 3 9v batteries and
it works great at that range. The filament is wired to run off
1.5 v but can be wired to run off 3v if desired. I used 6:1
vernier drives on both tuning capacitors and the regen. control.
All in all this was well worth the time and effort that was put
into it. I built this specifically for a nice gentleman named
Ernie, but after finishing it I definitely will be building one for
myself!
schematic courtesy of Mike Peebles. |
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