[time-nuts] Odd FTS 4060 Behavior

Adrian rfnuts at arcor.de
Sat Jun 12 22:38:33 EDT 2010


Yes, but if I press the align button when in 'failure mode', it just 
wont lock.
And I see the 10 MHz output scanning from 10,000,002.9 at 0 volts to a 
hair above 10 MHz (10,000,000.08) at 5 volts.
When I watch the beam current while it is scanning, I'm observing the 
beam current going up and down with a sharp maximum at every third scan 
when the tuning voltage has reached its maximum.
Thus, it seems like the OCXO is the culprit.

Adrian


EWKehren at aol.com schrieb:
> If it is always stable at 5xxxxx500.32 and has the lock light on than it
> has to be in the PLL.
> Bert Kehren
>
>
> In a message dated 6/12/2010 4:36:39 P.M. Eastern Daylight Time,
> rfnuts at arcor.de writes:
>
> John,
>
> it's been a while since I digged deeper into it, but I  remember having
> had problems to adjust the OCXO to tuning voltage range  center when the
> failure mode was there. I was already suspecting an OCXO  problem, but
> haven't yet watched it for a long period of time. Now as  you're
> suspecting the same, I'm planning to run the OCXO separated from  the
> 4060 on an external power supply.
> Btw. all of the control voltages  are very close to what is hand marked
> inside of the front lid (when it  runs correctly). The unit is stamped
> Sept, 22, 1989 and has a Rev B  4-27-90 marked EPROM.
> > From my old notes I see that the 'failure mode' 5 Mhz  output was
> 5,000,000.500,32 Hz. It was always stable at +1E-07  off.
>
> Well, it would be much easier to have a spare 1000B, but I  don't.
> Anyone got a 1000B that I could swap  in?
>
> Adrian
>
>
> John Miles schrieb:
>    
>> Sounds like the OCXO  has a jumping problem, going too far out of range
>>      
> for
>    
>> the CS loop to  correct.  Have you watched it for a long period of time
>>      
> with
>    
>> the  loop turned off?
>>
>> -- john, KE5FX
>>
>>
>>      
>>> -----Original Message-----
>>> From:  time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
>>>   Behalf Of Adrian
>>> Sent: Saturday, June 12, 2010 8:03 AM
>>>   To: time-nuts at febo.com
>>> Subject: [time-nuts] Odd FTS 4060  Behavior
>>>
>>>
>>> I have a FTS 4060 Caesium  Frequency Standard that I never managed to get
>>> working  properly.
>>> When powered on, it locks properly after some 10 minutes  and keeps
>>> running until it jumps off by about +1E-7. That is, the  10 MHz output
>>> then reads 10,000,001 Hz, and the red alarm light is  on.
>>> When I tried it yesterday again, it worked for about 2 hours  before the
>>> shift appeared. Oddly enough, the green 'Locked' light  was still on.
>>> This happens every 2...20  hours.
>>>
>>> Any ideas what could cause that  failure?
>>>
>>> Adrian
>>>
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