[time-nuts] HP 5071A Electron Multiplier of Cesium Beam Tube
jmiles at pop.net
Mon Sep 7 09:12:43 UTC 2009
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
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> Behalf Of Mike Monett
> Sent: Monday, September 07, 2009 12:00 AM
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] HP 5071A Electron Multiplier of Cesium Beam
> > Peak beam current with this tube is about 25 nA (-980mv pk into 40
> > Mohms), compared to the 80-200 nA typical range that the manual
> > calls for, and the Cs resonance valley isn't much higher than the
> > noise floor observed with no RF applied (-550 mv versus -520 mv).
> > 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.)
> > john, KE5FX
> John, out of curiosity, are you using homebrew or commercial to
> measure the phase noise ?
> If it's homebrew, is there any other information available?
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