[R-390] Working on R-390A IF Deck

[DJED1 at aol.com]

""What would be the most reliable way to set this oscillator system  "on
the money" for 455kHz?""
 
I'd vote for the frequency counter to start.  I use a scope probe to  connect 
using a high impedance input on the counter.  Once the radio is all  otghther 
and working, you can check the BFO setting by peaking the calibrator  signal 
in the narrowest filter bandwidth, then zero beating the BFO.  This  will 
account for any variation of the crystal filter frequency.
Ed