Rather than try to listen for zero beat I offset the dial reading by 1kHz and
use a computer sound card program to measure the frequency of the audio
tone. Fldigi is a good program to use for this.

-----
Julian, G4ILO. K2 #392  K3 #222.
* G4ILO's Shack - http://www.g4ilo.com
* KComm - http://www.g4ilo.com/kcomm.html
* KTune - http://www.g4ilo.com/ktune.html

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