Alvey Street

Hi John, The opto coupler,if it uses a LED and photo-diode/transistor, may not work as required.  I have designed/used many circuits with cds LDRs. They work, because the resistance change is pretty linear, and they are slow, so the resistance doesn't change very fast, say 1/100 second.  The opto coupler is probably much faster and may give ,pulsing. and glitches on the attack edge.  Good luck. Report progress if you go ahead.
Regards Vin G4ksy

On 07/09/17 09:43, travelloop@... wrote:

The QRX has no AGC. VK3YE designed a small and simple agc. By replacing the led and ldr with a small optocoupler a verry small unit could be created for the QCX.

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