[R-390] R390-A Cal tone

[Larry H]

Hi Ed,  It's probably not the function switch.  I don't recall a thread on
this before.  Try replacing the 2 5814's in the cal generator in the back
right of the RF chassis.  If not, pull the RF amp and see if it goes away.
It should.  Does the bfo work normally in the agc position?

Regards, Larry

On Tue, Apr 16, 2019 at 12:35 PM Ed Rafferty <dktedr at gmail.com> wrote:

> 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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