[R-390] R390-A Cal tone

[hamfish at comcast.net]

Ed,

If you are getting a cal tone, most likely not the 200KC crystal. Try the
easy stuff first, switch & 5814's. I had one R390/A that refused to play
nice and tried everything. Last items on the list were the silver mica caps
in that circuit. Hate pulling the RF deck, so the silver mica caps were shot
gunned. Working ever since.

Craig,

-----Original Message-----
From: r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> On
Behalf Of Ed Rafferty
Sent: Tuesday, April 16, 2019 12:35 PM
To: R-390 HF Receiver List <R-390 at mailman.qth.net>
Subject: [R-390] R390-A Cal tone

greetings fellow R390 caregivers,

I have a Motorola R390-A  which  has recently begun to  offer up its
resident  cal tone  when the BFO is switched to on  and the function switch
is set to Cal.  no matter what frequency is selected..  that is, the cal
tone remains constant and  does not zero beat  at the usual 100 kc
intervals.
could this be tarnished/ dirty contacts on the  function switch plates? or
elsewhere?   I haven't  discovered a thread that might relate to this issue
noted in the archives,
thanks in advance for any leads/ possibilities/ suggested courses of action,
v/r Ed R.  N4MDA
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