[Elecraft] What signals should appear on KIO3 LINE OUT?

[w5wz at w5wz.com]

What signals should appear on KIO3 LINE OUT?

My microphone audio ALWAYS appears on the KIO LINE OUT.  I have verified 
MON=0.

Using Heil Proset into AD-1-K adapter into front panel MIC jack on K3.
Stereo cable from KIO3 LIN OUT to LINE IN on a powered speaker.
Nothing connected to KIO3 LIN IN.
Nothing connected to KIO3 SPEAKER OUT.

MON = 0
MIC SEL = FP.H
MIC + LIN = ON
KIO3 = nor
LIN OUT = nor 10

--Scott, W5WZ



 From CQ-CONTEST VOL 239, Issue 20

Just to follow up on this one,  I did an Anydesk session with Scott last
night 11/21/2022, and after some experimentation, we discovered the 
problem.

Scott had done everything right.

It turns out he has three Elecraft K3 radios -- not K3s.   They have
line-level audio in and out.
For some unknown reason, his mic audio was coming back on the line out 
when
transmitting, even with the Monitor turned all the way off.
If we took the audio out from the speaker vs line out, the problem went
away and Mumble works perfectly.

So -- either there is some weird K3 setting that causes this (and I've 
been
using them 20+ years and don't know about it), or there
is something astray in the I/O board of the K3.   Anyway, we have a root
cause.

73

Gerry W1VE