Homebrew Amateur Radio
RS-3
Technically this radio is not one of the HBR series from QST but it
is from the July 1963 issue of QST. The article is from the Beginners & Novice
section. In 1963, at 14, I was indeed a "Beginner". This is the
first radio I built. I recently pulled it out of a box where it had been stored for
many years. I looked at it and thought to myself, "Damn, I really didn't know
what I was doing". Then, after a bit of reflection, I decided it wasn't too bad
for a first major project. I had built other smaller devices but none as
complicated as this. My construction technique left a lot to be desired. I
didn't have all the exact parts but found parts close enough to get it done. After I
completed construction it did not work. A friend of my father, Gene Reed, was an
amateur radio operator. He kindly assisted me with the changes needed to get it
working. I don't know where Gene is today or if he is a SK. I do know he gave
me the encouragement I needed to keep going and taught me a lot about electronic
construction techniques.
When I powered the radio up it didn't work. I dug through my old QSTs
and found the July 1963 issue. I read the article again and looked closely at the
pictures. I remembered that I always had trouble tuning the receiver. Well, I
saw why. I had reversed the bandset and bandspread variable capacitors. I also
found the volume control was working incorrectly. It had a few K ohms resistance to
ground. I took it apart, cleaned it up and it now works. The next problem was
no output from the 6AQ5. Even though the tube checked good it did not work in the
radio. A new tube fixed the audio output problem. Once I had audio I quickly
remembered another problem I never resolved when the radio was first built. It
"motorboats" when the volume control is turned up. I did some troubleshoot
and after all these years I finally fixed the problem. I added a grid leak resistor
and that solved it. The dial pointer broke off years ago. I actually found a
NOS unit on ebay. I am using it with a Hallicrafters HT-40 and HA-5 I recently
acquired. It has been restored and the pair is working. One other modification
was to change the stand-by switch to function as a T/R switch for the external relay.
Click on picture for larger
image.
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These pictures were taken before restoration |
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These pictures were taken after restoration and
front panel mods |
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Created: March 30, 2004. Last
Updated: June 15, 2013
© Copyright 2004, PakRatz, Corpus Christi, Texas, USA