[time-nuts] Zeeman frequency oddness

paul swed paulswedb at gmail.com
Mon Oct 29 20:05:17 UTC 2012


Corby
Thanks for the key part what to do when you need to fix the issue.
Regards
Paul
WB8TSL

On Sun, Oct 28, 2012 at 11:50 AM, <cdelect at juno.com> wrote:

> After the degauss you should recheck the Zeeman setting, which you did.
>
> You also verified the synthesizer frequency is set to the frequency that
> requires a C-field current high enough to reach 53.53.
>
> Since it is running at 48.21 you should increase the C-field setting
> until the central peak moves to 53.53.
>
> This is assuming that your unit has the resistor installed for 53.53.
>
> If not you will reach the end of the C-field pot before getting to 53.53!
>
> In that case you need to put a decade box (set to max resistance) across
> the C-field resistor and with the C-field set to 500 reduce the
> resistance until the central peak gets to 53.53.
>
> Then solder in a 1% fixed resistor (closest value to the decade box
> reading) across the C-field resistor.
>
> Now recheck and you will be able to use the C-field pot to reach exactly
> 53.53.
>
> Cheers!
>
> Corby Dawson
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