MC85.3
Not only that, I was
not able to function the S-201 (mic selector of the MC-85) if
I was connecting more than one rig to the MC-85.  At first I
thought my MC-85 is malfunctioning, but from talking with
five other hams in Israel who own the MC-85, I heard that
they all suffer the same problems!!
The main problem was caused because of a ground loop.  There
were two (2) grounds to ECM unit (you know it's illegal).
The ground on the p.c. near the Q1 transistor is absolutely
fine, but what about the one that makes a ground connection
between the ECM unit and the top of the goose neck?  The
solution is described on the enclosed paper marked (1).  The
addition of (2) and (3) were needed to give more R.F.
attenuation to the common mode and to the differential mode
rejection respectively.
CONTINUED IN FILE MC85.2