[R-390] R-390A Best Cal. Procedure

[Larry H]

Hi Dave,  The input vac is not critical, but a good range is 110vac to
117vac, with the best at about 113vac.  This range will keep the
calibration right on and keep the stress within reason.

Check the vfo ep adjustment and correct if necessary.  It should be within
500 hz, less is better.  Follow the wwv calibration procedure in the tech
ref after it's warmed up for at least an hour or when the vfo becomes
stable.  Monitor a stable station looking for very little drift with the
bfo on.  Use the highest wwv you can receive well.

Regards, Larry

On Mon, Mar 23, 2020 at 5:06 PM R. David Eagle via R-390 <
r-390 at mailman.qth.net> wrote:

> Hello all.  I am getting back in to finishing out my Motorola 390a now
> that I am at home for a few weeks.  I was curious what the best calibration
> procedure is to use?  How critical is it to have the line voltage at 115
> Volts?
> Thanks,Dave
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