[ARC5] R-32 receiver

[Kenneth G. Gordon]

On 4 Oct 2016 at 12:42, Cliff Miller wrote:

> Where in the circuitry would be the right place to attach the digital dial?  Also for an ARC-5 
> receiver?

For the transmitter, you would LIGHTLY couple to the output of the VFO, or even MORE 
lightly couple, possibly by something as simple as a small short "antenna" near the 
transmitter antenna.

You could try to connect to pin 3 of the 1626, but the level there may be too low. You can try 
pin 8 of the 1626, but any added capacitance there will effect the output frequency. I would 
connect, LIGHTLY, to pin 4 (grid) of either 1625.

For the receiver, you would have to LIGHTLY couple to the output of the HFO, which would 
be to either pin 6 (plate of HFO) or to pin 5 (grid of HFO) of the 12K8 mixer, then input the 
IF frequency as your offset. For instance, the frequency of the HFO minus 1415 kHz for the 
80 meter receiver.

By LIGHTLY couple, I mean as little as 1 or 2 pfd of capacitance. Possibly simply wrapping 
a bit of insulated wire around one of the leads to the pins above and connecting the other 
end to the counter. It depends on how sensitive the counter is.

Remember that any added capacitance in any oscillator circuit will effect the output 
frequency a bit.

Ken W7EKB

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