[time-nuts] Is my Cs C-Field set OK or do I need to take more
data?
Chuck Harris
cfharris at erols.com
Mon Jan 10 21:17:29 EST 2005
Well, if it is at all similar to the FTS 4050, the Zeeman frequency
should be 42,820 Hz, at 1 Vrms.
How are the guts of the 4060 arranged? In the 4050, there is an FTS5000
self contained C-Beam standard module inside of the frame.
-Chuck Harris
Brooke Clarke wrote:
> Hi John:
>
> Yes, but I have seen a number of different numbers for what the Zeeman
> frequency is supposed to be. This may be because of where in the
> multiplication chain it's injected. But I need to know the exact
> frequency for my setup and better how to calculate it. In your case
> with a FTS tube in an HP box, what frequency is correct?
>
> Have Fun,
>
> Brooke
>
> John Ackermann N8UR wrote:
>
>> Brooke Clarke wrote:
>>
>>> Although there's a connector on the FTS4060/S24 marked Zeeman,
>>> neither the hardware nor the manual I have talks about it in any
>>> way. How can I use the Zeeman input?
>>
>>
>>
>>
>> Brooke, I'm just learning about this stuff and haven't read up on the
>> physics yet, but the Zeeman input is a low frequency signal (for HP,
>> 53.53kHz if I recall correctly) that you inject into the standard.
>> You open the control loop and tune the C field to peak the I current
>> (there are several minor peaks and one main one). If you don't have
>> access to GPS or another reference, this is the way to adjust the C
>> field to compensate for local factors. Using GPS is more accurate,
>> though.
>>
>> John
>>
>>
>>
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>
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