[time-nuts] 10811 warmup (Jason Rabel)
jason at extremeoverclocking.com
Mon Jan 22 16:24:37 EST 2007
Thanks for the info. Just for grins I tried to hook the GND on pin 2 to the
GND on pin 4/5. Still nothing.
I'm going to let it cool down then open it back up and start following the
troubleshooting in the manual, hopefully it will be a simple fix like yours
turned out to be. :)
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Daun Yeagley
Sent: Sunday, January 21, 2007 6:42 PM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] 10811 warmup (Jason Rabel)
I might have something for you on this.
All this talk about the 10811's forced me to get off my duff and get working
two 10811's that I have and have been sitting on my shelf for several years
(like well before I "retired" from Agilent in '03).
One is a 10811-60102, and the oven heater was bad. I had opened it up
years ago, and that was about as far as it got. Now that Jack has made the
of the manual, I had no excuses left. It is now running after replacing the
10V. regulator, U1, and the two one ohm emitter resistors!
The second one is a 10811-60160, which was still in the original plastic
Well, I decided to power it up too, so I built the little test harness
in the manual (this is the model with the edge connector). Well, I couldn't
the oscillator to draw any current! I really didn't want to open up a
unit, but I didn't see any other easy choice. After pawing around for a
I came to the conclusion that there is an error in the manual. Pin 2 is
a ground, but it is only for the 10MHz output. The "real" power ground for
oscillator is actually on pin 4! I tied pins 2 and 4 together, and it is
working fine. I would suggest that you check this out carefully... maybe
why it won't run.
At this point I need to make a run over to John Ackermann's and get them
in more precisely, as at the moment I don't have a better standard here at
house (I'm working on it though!). I can bring them to within 1 Hz using my
Spectrum Analyzer, and that is close enough for the two to injection lock,
I'm currently running both of them from a common lab supply.
Next on the agenda is to get one of my FRS-C Rb's put together.
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