The K3 mic jack shell is also connected to the circuit board ground plane.
Sure, it is a "pin 1" problem since it does not connect directly to the
front panel metalwork, but connecting the shell to the board ground is
better than leaving it float. The shield of your mic adapter cable
should connect to the shell.
I suggest using pin 7 for the AF return and if you add a PTT 'tap',
connect the 'hot' side to pin 2 and the return to pin 8.
If you connect nothing to pins 5 and 6, those connections will work for
both Elecraft and Kenwood mic jacks.
73,
Don W3FPR
On 7/6/2015 5:58 PM, Joe Subich, W4TV wrote:
Assuming there has been no change from the late K3, pins 7 and 8 are
both connected to circuit board common. Since the K3/K3S front panel
mic jack is generally compatible with Kenwood (except for the reversal
of pins 5 and 6), most folks treat pin 7 as mic return and pin 8 as
shell/ground/chassis.
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