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: [email protected] [mailto:[email protected]]on > Behalf Of Mike Monett > Sent: Monday, September 07, 2009 12:00 AM > To: [email protected] > Subject: Re: [time-nuts] HP 5071A Electron Multiplier of Cesium Beam > Tube > > > [...] > > > 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? > > Thanks, > > Mike > > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
