Many thanks for all the thoughts and information people have offered on
this issue! If in addition to the extra high pass filtering the KX2 has
RX SHIFT permanently enabled, that certainly explains why it's immune to
It sounds like it might be worth trying a 3Mhz low pass filter to sort
out 80m and above and accepting that RX SHIFT will need to be used on
top band (which I rarely use anyway). Because the local broadcast
station is quite close to top band (around 1.6Mhz), I doubt a high pass
filter that allowed top band through would reject the broadcast
transmitter sufficiently to sort the problem.
It seems like there might be a few commercial products which could work
- or I could just get out my soldering iron!
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