The top of my list would include a really effective noise blanker.
Those of us who don't live way out in the countryside are often plagued
with power line noise, which a good noise blanker can largely eliminate.
Many older transceivers have noise blankers which are very effective on
impulse noise, but only as long as there are no strong signals within
5-10 kHz of the desired signal.
The "K4" noise blanker would have the ability to use a second receiver,
with a wide IF bandwidth, tuned to a nearby quiet segment, to control
the noise blanker in the primary receiver(s). It would be able to
automatically find that clear segment. To be effective, the noise
blanker receiver has to have a bandwidth of at least 15 kHz, and there
can be no strong signals within that bandwidth.
Perhaps direct sampling would allow this to be done in software, if the
dynamic range were large enough, but it would have to work as well as a
hardware version.
73,
Scott K9MA
--
Scott K9MA
k...@sdellington.us
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