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
ewkeh...@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,
rfn...@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-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on
Behalf Of Adrian
Sent: Saturday, June 12, 2010 8:03 AM
To: time-nuts@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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