[R-390] R-390A Calibrator

[Bob Camp]

Hi,

Check to see that the crystal oven is working properly. There are only about
three states they operate in

1) Fine - at the right temperature and everything.
2) Thermostat switch shorted - smoke comes next
3) Thermostat switch open - runs cold and the crystals are off frequency.

Repairing the crystal oven probably isn't worth the trouble. Both the switch
and the wire they used in the heater are a bit tough to find. It's easier to
find a whole new oven assembly.

    Take Care!

        Bob Camp
        KB8TQ


----- Original Message -----
From: "Giles Gant" <bgant@bellsouth.net>
To: <r-390@mailman.qth.net>
Sent: Tuesday, December 31, 2002 4:31 AM
Subject: [R-390] R-390A Calibrator


> Hello all,
>
> I attempted to calibrate the 100kc calibrator on my 390A but it just
> won't get there. I set up as given in the TM using WWV and 5.2 kc
> above is as close as the C310 trimmer will bring the oscillator.
>
> I am thinking a bad tube but I guess it could be the xtal. Anyone had
> this problem. What do ya'll think?
>
> Thanks, Giles
>
> _______________________________________________
> R-390 mailing list
> R-390@mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/r-390
>
>
>