[time-nuts] Is my Cs C-Field set OK or do I need to take more data?

John Ackermann N8UR jra at febo.com
Mon Jan 10 18:43:04 EST 2005


I don't have the docs for the FTS tube to know if it's different than 
for the HP tube.  Not sure whether the difference is in the tube, or in 
the surrounding circuitry.  Hopefully someone else can chime in...

John
----

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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