[Elecraft] K3/K3S Pin 1 question

[Don Wilhelm]

Dan,

Jim Brown K9YC or Joe W4TV would be a better resource than I am, but if 
it were mine, I would preserve the balanced configuration through your 
switchbox and only connect the mic low to ground at each radio's plug.

73,
Don W3FPR

On 9/14/2015 1:12 PM, Dan Atchison via Elecraft wrote:
> I am building a switchbox to allow use of a Heil PR-781 microphone to 
> be used by my K3S and K3, the switchbox using XLR connectors.  I note 
> that in the Heil XLR cable ended in an 8-Pin Foster has mic low (-) 
> tied to ground and (+) tied to mic high.
>
> Knowing that the XLR pin 1 should be chassis ground, my question is, 
> "At the switchbox, should I tie XLR pins 1 and 2 together and only 
> switch XLR pin 3 between radios?"  IOW, should XLR pins 1 and 2 be 
> chassis grounded or should I chassis ground pin 1 and switch both XLR 
> pins 2 and 3?
>