[time-nuts] Zeeman frequency oddness

[John Ackermann N8UR]

Thanks to all for the helpful replies.

At this point, I believe what happened is that the degausser isn't 
working properly and that may have resulted in the tube being more 
magnetized rather than less; no matter what I do, I am now getting lock 
at about -5e11 -- which is not what it used to be.

I've started troubleshooting the 10368A degausser, and it appears that 
the exponential current decay, doesn't.  I fear that op-amp U1 (a pre-IC 
block labeled Intech A-233) is bad as the voltage driving the darlington 
pair is stuck at 14.5 and doesn't decay with time.  I hope that the 
A-233 is just a potted, discrete transistor, generic opamp, so I suspect 
that I can dead-bug something like an LM358 in its place.

If anyone else has encountered this situation, I'm all ears...

John
----

cdelect at juno.com said the following on 10/28/2012 11:50 AM:
> 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
> ____________________________________________________________
> Woman is 53 But Looks 25
> Mom reveals 1 simple wrinkle trick that has angered doctors...
> http://thirdpartyoffers.juno.com/TGL3141/508d54a2aac4554a26ff4st02duc
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>