[R-390] cyclic reception, 0-8MC, non A

[R390rcvr@aol.com]

Good evening:

Interesting behavior from my 'new' non A.  When listening to it tonight, on 
0-7MC,
the reception would abruptly go in and out on approx  5 sec cycle. On for 5, 
off for 5 sec. Dropped out completely when off. The cycling varied a bit, not 
absolutely regular, but fairly close. Was fine on 8 meg and above. I replaced 
both V203, 1st mixer, used only on 0-8MC, and V401, the first crystal 
oscillator, which operates only on 0-8MC.

I varied the line voltage, didn't seem to effect cycle speed. No control 
settings seemed to make any difference. When it was 'on', the reception 
seemed just fine.

It seems unlikely that some thermally induced problem could be so regular.

I would certainely be interested in any ideas that might steer me in the 
right direction.

Cheers

Randy Stout


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