[R-390] CU-168 Coupler

[Tony Angerame]

The CU-168 coupler is in use by many R-390a owners so I hope this is not
too far off topic. Question is: "Where can I get a schematic". The
circuit is easy to reverse engineer but I just wanted to know what
protection this device offered from excessive rf voltages at the antenna
if any? I'd like to know this before I figure a way to add it in myself.
i.e an extra set of relay contacts shorting the input when I key up.


Tony WA6LZH (Aging Intercept Operator)

R-390a Vietnam era Intercept Radio
SP-600  Korean war to Vietnam era Intercept Radio
BC-779/SP-210  WWII era Intercept Radio
CU-168 Multicoupler   Listening to all of them at the same time!