Question About HR-10 Reciever - Help!

[wa1vwl]

As I recall, the AVC is supposed to be switched OFF when the BFO is
turned on. The HR-10 doesn't have a product detector. It just couples
some of the BFO energy to the last IF stage. As you've probably noticed,
there is some S meter indication when the BFO is on. The HR-10 also
doesn't have voltage regulation so the oscillators are bound to be
"pulled" the current is being drawn.

Gerry/W1ID

Mike Hardie wrote:
>
> Fellow Heath enthusiasts,
> An HR-10 receiver has a problem that has me baffled.  The BFO frequency is
> "pulled" by strong signals or by changing the RF gain control in its upper
> range, sort of like chirp but on a receiver.  Switching the AVC off helps
> reduce this but it's still there.  There's nothing obviously wrong,
> voltages check out pretty good except the B+ is a little high, cutting it
> back to the prescribed 210 vdc from the 6X4 by inserting a resistor makes
> the problem worse.  The resistors that should be around the power supply
> are all OK and I've replaced the 3 x 20 uF cap.  Any ideas?
>
> Mike
>
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