[time-nuts] Zeeman frequency oddness

Magnus Danielson magnus at rubidium.dyndns.org
Sun Oct 28 13:53:26 EDT 2012


On 10/28/2012 06:36 PM, John Ackermann N8UR wrote:
> 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...

That would explain it.

If I've only knew, you could have borrowed my degausser when I was in 
your neighbourhood.

Cheers,
Magnus




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