Back in the '60s when we were still using mechanical teleprinters, I operated
RTTY on the same bands a notable local DXer operated. He was really upset if
any clicks and pops were present to upset his DX band. Using a polar relay to
key the AFSK oscillator frequency really screwed up the
I also ran RTTY and had a DXer a few houses away (actually
about 750-900 feet...), only mine was 2m FM and he was
2m SSB.
My audio oscillator was a one-transistor oscillator with an
88mh toroid in the collector, and a feedback coil I added
that fed back to the base. A second added winding was
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