[R-390] Need value of R235 from a RF deck

[Craig C. Heaton]

Cal changes when switching from Cal position to either AGC or MGC or
changing bands. I've tried the crystal from my Motorola R-390A and a crystal
someone sent me and a new crystal from International Crystal, they don't buy
any happiness. 

All these crystals work in the Motorola, no joy in the Amelco. So the
problem is with something in the crystal oscillator circuit of the Amelco. 

As we swap e-mails, the RF deck of the Amelco is belly side up, the rest of
the silver mica caps around V206 and those leading to V207 are being
replaced. Just stopping for a lunch break.

Regards,
wd8kdg
Craig

-----Original Message-----
From: DJED1 at aol.com [mailto:DJED1 at aol.com] 
Sent: Tuesday, July 29, 2008 10:02 AM
To: wd8kdg at worldnet.att.net; r-390 at mailman.qth.net
Subject: Re: [R-390] Need value of R235 from a RF deck

Not sure I understand.   First, is it an oscillator problem or a  calibrator

problem?  If you zero the BFO while receiving WWV,  does the note change 
between AVC and manual (remember full open manual will  overload the
receiver, so 
turn it down)?  If not, then probably not a  downconversion oscillator
problem. 
 If yes, then one of the  downconversion oscillators is being pulled by the 
AVC.  If, on the other  hand, the cal oscillator is changing after zero
beating 
with WWV, then it  must be a cal osc problem.  Could be a bad cal crystal or

dirty crystal  socket also.  Let us know what you try- we'll figure it out, 
especially  with Roger here.
Ed W2EMN



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