Page 13 of the KAT500 owners manual describes an AH-4 connection between Icom 
radios and the KAT500.

Does this work for you?

73 de Dick, K6KR



> On Sep 12, 2020, at 14:06, Russell Domareck via Elecraft 
> <elecraft@mailman.qth.net> wrote:
> 
> I own a KAT500 and KPA500 that I use with an IC 7300.  When in CW mode, the 
> KAT500 can be activated by keying the IC 7300, no problem.  This allows the 
> KAT500 to find a match with low power while the KPA500 is in standby mode.  
> In SSB mode, there is still the need to activate the KAT500 for the match, 
> however, neither keying the mike nor speaking into the mike activates the 
> KAT500.  A press of the transmit button in the IC 7300 also did not activate 
> the KAT500.  I find that I have to first switch to CW mode for the activation 
> before switching to SSB so that the KAT500 is all set for KPA500 operation.  
> Is what I am doing the only way to do this?  I have read related posts on 
> this subject but they did not satisfactorily answer my question.
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