Snip
Generally speaking, the key clicks and the general hash most of us call
phase noise (It's actually a mix of phase noise, partition noise, shot
noise, Johnson noise, artifacts of multiple mixing, and who knows what
else, with phase noise usually predominating) is worse on 20 than 40; and
given comparable antennas it's still worse on 15 and 10.
snip
Generally speaking partition noise is normally associated with noise created
by using tubes (vaccumn). Partition noise is the result of variations in
the division of current within the positive electrodes within a electronic
vaccumn tube.
73, Jim
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