[R-390] Strange modulation on carrier

[DJED1 at aol.com]

Strange- I went down to the workshop to try a few measurements based on  
Tim's suggestions.  But in order to check performance without AGC I had to  use 
the signal generator, rather than the calibrator.  Wow- no modulation  at the 
same signal levels.  So it seems to be an interaction between the  calibrator 
and the 17 MHz oscillator.  I reconfirmed that the modulation  exists on the cal 
signal.  Guess I've got a mystery to solve, unless  someone has already done 
that.
Ed