I was also concerned about so many filters until I realized
Elecraft has actually leveraged the Inrad 7XX series of filters
offered for the 8.215 MHz IF of the FT-1000 family. I suspect
This is an interesting point! Makes me wonder about the 1.8kHz filter
for SSB contesting.
designs. I will be especially interested in seeing IMD/BDR
measurements for the variable filters since *variable* also
may imply *variable* IMD/BDR results (depending on BW).
Especially, as it would seem to me, if the diodes used to tune the
filters cause any problems.
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