In the more crude tube receivers; knowing oprs. just moved the tuning
knob a tiny bit to check for someone calling right on frequency with a
direct conversion receiver. The receivers, by the way, are wide enough
to NOT conceal a close by caller, unless you have a crystal filter in
the RF path.
Plenty of those National regen receivers mentioned as NOT working, were
the ONLY receiver for hundreds of young or poor (or both), ham operators
of the 1930's.
In a regen, you advance the regen control until the receiver is self
oscillating and there you have your BFO note. You have to read the
instructions or theory of operation of a regen, just as you do today for
computerized rigs!
Stuart Rohre
K5KVH
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