[Elecraft] K3 8 pin mic wiring to avoid "pin 1" problems...how best to...??

[VK7JB]

Hello Group,

I'm rewiring an 8 pin mic connector FROM an Icom configuration TO a  K3
pinout.

Wiring the Mic + and PTT lines is straight forward.  But how best to wire
the PTT GND,  Mic - and Cable shield connections is bothering me. 

I'd like to wire the Mic - and cable shield  to avoid the risk of "pin 1"
problems and RFI etc, but if I interpret  the schematic and mic pinout info
for the K3 correctly,  front panel mic pins 7 & 8 are wired in common with
the chassis.   

So, am I correct in understanding that on the K3, there's no way of
seprating Mic-, PTT GND and cable shield/chassis - ie they're all bonded in
common?

If this is correct, should I simply  wire PTT GND to pin 7 and  Mic- and
cable shield to pin 8.  (But they are all connected together in the rig).

In other words,  is this wiring pinout  the most appropriate?

Pin 1 ----> Mic +
Pin 2 ----> PTT
Pin 7 ----> PTT GND
Pin 8 ----> Mic - and cable shield.
(pin 7 and 8 being bonded internally anyway)

Thanks for any clarification.  It's possible I'm over-thinking this! :)

73,
John
VK7JB







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