[R-390] r-390a chirping CW

[John KA1XC]

Not too unusual for radio's of this era when their RF gain is run wide open
for CW copy.
My GPR-90 has the same chirpy phenomena which is minimized by using SLOW AGC
or eliminated by backing down the RF gain.

Got to remember these old radio's have free-running oscillators with no
buffering between them and their loads, and mostly unregulated supply
voltages. Today's synthesized radios will spoil you in this respect.

John