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+ AA6YQ comments below

In a Danish ham radio newsletter I saw a brutal but supposedly effective
fix for the PW-1 "issue". It may have some serious limitations since I
have not seen it spread.

A reversed diode between the CI-V line and the tranceivers's PTT output.

Providing the PTT line is either high impedance or a voltage higher than
that of the CI-V, it will do nothing while receiving but pull the CI-V line to
ground when transmitting. Effectively preventing the PW-1 to be mislead
into changing band while transmitting.

+ That wouldn't prevent a collision while receiving to change the PW-1 frequency just before it is instructed to transmit.

? ? ? 73,

? ? ? ? ? ? Dave