A history of CW pitch matching would seem to be incomplete without a mention of the BFO (Beat Frequency Oscillator).
When I started operating CW I had separate TX and RX. TX was homebrew and the RX was an AR-88D. A common technique for tuning a CW station was to set the BFO to zero offset, tune the station for zero beat, and then offset the BFO to give the desired pitch. In my case that pitch was the frequency that resonated the diaphragms of the headphones.
Having independent RX and TX meant there was no risk of 2 stations chasing each other up or down the band.
Thanks for the nostalgia trip.
Andy, k3wyc
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