[time-nuts] Odd FTS 4060 Behavior

Adrian rfnuts at arcor.de
Sat Jun 12 16:36:20 EDT 2010


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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>
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