[Elecraft] Is K3/0 Audio pass through or processed in K3/0?

[W1AN]

Hello group, I've found minimal information on whether or not the K3/0
actively handles audio from the front 8 pin microphone jack before exiting
the rear 1/8" connector feeding the mic input on the RRC Control unit. I can
change settings for the K3/0 such as Bias, FP-H/L etc., when disconnected
from the network but don't think the changes actually do anything. Is the
front 8 pin mic connector hard wired "DC connected" to the rear 1/8"
connector and simply a pass through? I know that when connected through to
the remote K3 the settings are normally to the K3. I wasted several hours
trying to eliminate some "buzz" audio noise when connecting my Heil headset
through the 8 pin connector on the K3/0. I finally made up a connector to go
from the Heil directly into the RRC control unit. The noise then was gone!
So noise is being picked up inside the K3/0, a ground loop possibly? The
noise is not 60 Hz, but varies in frequency with the Advances settings in
Microbit for the Remote rig.

Ideally some minimal settings could be configurable from the K3/0 such as
Bias ON or OFF for the local 8 pin mic input. But if the wiring is hardwired
and simply pass thru where is the buzz coming from? Documentation and an
internal schematic would greatly help!
73, John W1AN





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