[time-nuts] Odd FTS 4060 Behavior

EWKehren at aol.com EWKehren at aol.com
Sun Jun 13 07:32:10 EDT 2010


Adrian
 I have also a FTS 1200 that is 2 Hz off at 5 MHz and can not be tuned  to 
5 MHz, have not dug into it yet. But first I would check the tuning range of 
 your OCXO depending as to which one it is the tuning voltage should go 
past 5  Volt.
 If you see peaks on the current with the Osc. above 10 MHz there has  to 
be a problem the way the 9.xxx GHz is generated. Most likely the  PLL.
Bert
 
 
In a message dated 6/12/2010 10:38:47 P.M. Eastern Daylight Time,  
rfnuts at arcor.de writes:

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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