[R-390] Having issue with 2nd Crystal Oscillator in R-390

[Patrick Nelson]

Hello all,

I just joined the group and have both a Motorolla R-390 and an original contract Collins R-390A.

I am working on restoring the R-390 and am having a problem with the 2nd Crystal Oscillator.  It seems to be oscillating on multiple frequencies on all the higher bands (14Mhz and above).  For a picture of the waveform see:

http://www.sunday-special.net/bad_waveform.jpg

 

This causes multiple images of the signal.  In other words, it's possible to zero beat with the calibration oscillator in two places a few Khz apart.  Any ideas what might be causing this?

Thanks!

-Patrick
 		 	   		  
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