You can put outboard band pass filters to limit some of the problems of
being close to other rigs. However, if you have two stations the need
to be close, let one run vertical polarization and one horizontal, if
feasible. If the pass band is made to be just the phone band, that may
help. One issue is creating a sufficient filter without full band
response, ie. phone or CW sub band only. Another idea that is very
possible to implement is to construct a Helical Resonator to notch out
the other station. Notches from 20 dB to 40 dB or better can be home
constructed.
Double shielded coax makes a noticeable improvement as well.
Look in the ITT radio handbooks for
helical coil resonator, a coil in a can to describe it simply.
Stuart Rohre
K5KVH
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