TECH: AF oscillator diagram added to Files

Steve Ratzlaff

I added an AF oscillator to the Files (Antenna and Equipment). It goes with Ray's weak signal source and supplies the audio modulation to make it easier to find the RF signal. Ray has also upgraded his circuit diagram to make it easier to build. I've built this--it works well and draws low current; adding the AF oscillator also draws low current--about 5 mA total for both, so works well from a basic 9 volt battery.
Thanks, Ray, for the weak signal source diagram.

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