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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