Geoff said "A noise gate placed in the signal path can be a source of
IMD products, even
when it is not active.
IMHO a separate noise receiver which can be tuned over a limited
frequency
range above the band in use to avoid "real" signals, whose output
inhibits
LO drive when noise is present, plus the required delay in the signal
path,
is a useful recipe for a noise blanker."
That's why shutting the LO off is such a nice way to blank. Except for
the expected result of blanking itself, there's no new circuitry and no
additional IMD when the LO is running. I had an idea of doing another
noise receiver, also TRF, that tuned HF and thought I could combine the
blanking pulses from both noise receivers. But ran out of steam and
never tried to do it.
W7AAZ
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