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

[nr4c]

I've wired several K3, Kenwood and ICOM mics and Kenwood and K3 are 
very similar.  I think you'll find that the mic and PTT are the same, 
with mic being on Pin 1 and 7, PTT on 2 and 8.  Cable shield is usually 
tied to pin 8 as well.

...bill  nr4c


On Thu, 2 Jun 2011 06:04:55 -0700 (PDT), VK7JB wrote:
> 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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> 
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