[Elecraft] KAT500/KPA500 with Icom 7100

[Jeff Griffin]

I brought my KAT500/KPA500 setup to my winter home after getting it put
together and working with my K3 at my shore residence. Now I'm trying to get
it working with my Icom 7100. After setting up the Elecraft pair, only menu
item I see to set is in the KPA500, RADIO, set to ANALOG. I'm having two
problems. 
1. I'm not getting PTT to activate. I checked the AH-4 interface cable and
it has the correct pinout. If I ground the center pin of the RCA PTT cable
the AMP keys as expected. The problem is the 7100 isn't grounding pin one.
Does anyone know if there a config command in the 7100 to activate this? I
can't find anything. When you key up the 7100 the pin stays open and not to
ground as I think it should be doing.
2. I'm not getting any band switching with this setup. If I click on a spot
with DXLab I would expect the Elecraft pair to follow the 7100, I'm thinking
if problem 1 is fixed problem 2 will also be ?

All other AH-4 functions seem to be working ok. The cable powers the KAT500,
and If I hit the tune button on the 7100 the KAT500 obeys.

Coolaid drinkers, yes I know if I replace the 7100 with another K3 my
troubles will be over :-)

73 Jeff kb2m