[R-390] R-390A Antenna Connections

[Richard W. Solomon]

I figured out which was which, but I still have an orphan left.
There is a metal tag on it marked P218. I think that may be the
one that goes to the Sync Xtal Osc ?? Whatever that is.
I still cannot find it in the TM I have.

Any thoughts ??

Thanks, Dick, W1KSZ