I wonder if it is physically possible to do anything about the far out
dynamic range beyond 10kHz which is a "mere" 104 dB.
Take a look at <http://www.xs4all.nl/~martein/pa3ake/hmode/>:
This is a quote from the conclusion:
It turns out to be quite possible to construct a frontend with a
dynamic range in excess of 120dB in SSB bandwidth on 40M. The best
news maybe is that it is possible with components that are readily
available today. No impossible to get specialized surplus parts are
needed. Everything is still off-the-shelf, also the special QT
crystals used in the roofing filter. However good quality polystyrene
capacitors may become more and more a problem as many manufacturers
have stopped production of those capacitors as far as I know years
ago. Most certainly alternative good RF grade caps will remain
available, although probably a bit expensive.
<http://www.xs4all.nl/~martein/pa3ake/hmode/conclusion.html>
vy 73 de toby
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