[time-nuts] HP 5071A Electron Multiplier of Cesium Beam Tube
Mike Monett
xde-l2g3 at myamail.com
Mon Sep 7 18:19:50 UTC 2009
"John Miles" <jmiles at pop.net> wrote:
> It's an HP 3048A. I have long held vague ambitions toward
> replacing it with a homebrew digital system but it hasn't happened
> yet.
> john, KE5FX
Thanks, John. You have a fortune in first-class equipment!
From your previous post:
>> But the output phase noise, at least, is well within specs (-88
>> dBc/Hz at 1 Hz in short time constant mode, spec=-82 dBc/Hz, and
>> 105 in LTC mode, which is actually better than the -96 dBc/Hz
>> spec for the option-004 tube.)
The -105 dBc/Hz at 1Hz looks pretty good. Is that measured with the
internal reference in the 11848A? Or can it even get down that low
at 1Hz?
If not, I see from your web site you have a Wenzel 80MHz ULN. Did
you use that for the reference? If so, did you ever find out what
was causing the ~10dB excess noise in the regenerative divider on
your web page at
http://www.thegleam.com/ke5fx/regen.htm
Lots of good info on your site.
Thanks,
Mike
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