[time-nuts] How do time-nuts measure phase noise?

[Don @ True-Cal]

Joe,

I have the 8560E analyzer with the 85671A utility. I find the utility to be fairly slow in taking the numerous measurements and processing the results. The PN program from KE5FX EZGPIB does this in about 1/4 the time and has more post processing display options. You do need a computer with GPIB access to the analyzer but my opinion is this is a much preferred method unless portability is needed.

BTW, all of John's software in the EZGPIB kit is "first class". The 7470A emulator also works great on 8560 series printouts.

Regards...
Don

  ----- Original Message ----- 
  From: J. L. Trantham 
  To: 'Discussion of precise time and frequency measurement' 
  Sent: Monday, August 17, 2009 9:22 AM
  Subject: Re: [time-nuts] How do time-nuts measure phase noise?


  Can anyone provide any information on the usefulness of the Phase Noise
  Utility program (85671A) for the HP 8560 series Spectrum Analyzers?

  Thanks in advance,

  Joe

  -----Original Message-----
  From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
  Behalf Of Bruce Griffiths
  Sent: Monday, August 17, 2009 7:13 AM
  To: Discussion of precise time and frequency measurement
  Subject: Re: [time-nuts] How do time-nuts measure phase noise?


  Some have commercial phase noise measurement systems like Symmetricoms
  5115A, 5120A. 5125A. Some have older HP phase noise measurement systems like
  the 3048A etc. The rest of us have to build our own systems based around
  sound cards or surplus spectrum analysers together with the necessary
  mixers, low noise amplifiers etc.

  Unless your sources are very noisy you wont be able to measure their phase
  noise with just a selective voltmeter or even an RF spectrum analyser. If
  you cant build it, then you need to acquire something like the HP3048 or the
  NIST phase noise measurement box currently on ebay.(Item:
  260423038423)

  Bruce


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