[Elecraft] K3/K3S Pin 1 question

[Bob McGraw - K4TAX]

Maintain the signal path integrity all the way through the switching 
arrangement.  That means 3 poles to switch from the XLR input  to the 8 
pin Foster connectors.  Keep all away from chassis ground.  If you 
believe the box should be grounded, I suggest doing so at the input XLR 
pin #1 to chassis ground.   And keep ground between the outputs, being 
the Foster connectors, separate so as not to connect the two radios 
together through the shield/ground.

73
Bob, K4TAX
K3S s/n 10,163

On 9/14/2015 12:12 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?
>
> Thanks in advance.
>
> 73,
> Dan
>
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