[Elecraft] KRC2 /K3

[Pfizenmayer]

I have a KRC2 that is presently using the AUX Bus input to  drive an Array Solutions remote antenna switch .  At 100 watts , it is usable but at 1500 watts is unusable. This evening I even unplugged the 12vdc supply and it still drove the K3 nuts - froze it once and several times it would show KPA500 (dunno where that comes from , I don't have one ).ONly thing that kills it is to unhook the AUX Bus line. I am not real wild about it changing antennas randomly -- even with two SWR triggers in use. 

I won't bore you with the ferrite cores etc I have tried and or still have in place.and other details -  - my questions are  ----

Anybody have any experience with how much RF filtering I could insert in the 1 foot K3/KRC2 aux bus cable ? 

OR -   is it worth changing to the RS232 bus and using the BCD data from  the K3 ?  Looking at the KRC2 schematic , it looks like the microprocessor is still in the act with the RS232 inputs going thru it . But I have filtered  RS232 data lines with   Ferroxcube VK400 2 1/2 turn hi mu ferrite chokes and 0.001's at least on PTT and KEY  lines with no problems. 

I am tempted to sell the KRC2 and build my own BCD  RS232  to serial  converter, just thought the KRC2 would be a quicker solution. Its overkill for what I need  to do. 

Hank K7HP