[time-nuts] HP 5071A Electron Multiplier of Cesium Beam Tube
xde-l2g3 at myamail.com
Mon Sep 7 06:59:32 UTC 2009
> 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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