[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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