[HBR] Re: HBR -- Part 3 (PART ONE)

[Walt Hutchens]

I am again unable to send to the list owing to being considered a spammer.
I'll try a binary search, hoping to find the offending section.  There are
no real instructions for this, just 'the text of your message seems to have
words or punctuation that makes it look like spam.'

Sorry for the extra messages.

Quoting self:
> The Eddystone dial that I have is factory-calibrated for six ham
> bands; I think it came as part of a kit of parts for the G3LOK
> receiver design. (Think: HBR with bandswitching, using itty-bitty
> coils; NOT a great design!) And I'm using the tuning cap that
> came with.

Oops! Not G3LOK, but G3RKK, a later, fairly similar design that is
described in considerable detail in the RSGB 'Radio Communications
Handbook,' Fourth Edition, 2nd printing, 1969. (Good book for serious
HBR-ers to have, BTW) The commercial 'Electroniques Ltd.' front end
for this receiver is described there, including a circuit diagram that
matches the equipment I have.

One might wonder why I didn't just use this bandswitching front end
assembly: The reason (aside from wanting to do a plug in coil design)
is that it's pretty close to junk, with wires loose, plastic parts and
wires that have had close encounters of the 100-watt soldering iron
kind, and a few parts broken or missing. And except for what appears
to be an excellent tuning cap, it's a 'budget' design, all the way.

After a bit of study it looks like the 80M and/or 160M oscillator
coils may be gone, rewound with who knows what for some higher
frequency. Anyway, the windings on one of them are loose.

The good news is that I have the circuit diagram and (I think) most of
the actual parts that allowed that oscillator to match that dial. It
is a Vackar circuit, which has the virtue of using a very simple coil.

(END OF PART ONE)