[time-nuts] 10811 warmup (Jason Rabel)

Jason Rabel jason at extremeoverclocking.com
Mon Jan 22 21:24:37 UTC 2007


Daun,

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. :)

Jason

-----Original Message-----
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)

Hi Jason

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
on
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
several
years ago, and that was about as far as it got.  Now that Jack has made the
PDF
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
wrap!
Well, I decided to power it up too, so I built the little test harness
described
in the manual (this is the model with the edge connector).  Well, I couldn't
get
the oscillator to draw any current!  I really didn't want to open up a
virgin
unit, but I didn't see any other easy choice.  After pawing around for a
while,
I came to the conclusion that there is an error in the manual.  Pin 2 is
indeed
a ground, but it is only for the 10MHz output.  The "real" power ground for
the
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
that's
why it won't run.
At this point I need to make a run over to John Ackermann's and get them
netted
in more precisely, as at the moment I don't have a better standard here at
the
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,
since
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.

Daun





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