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Fri Sep 4 12:59:48 UTC 2009

Page 4-45:

The phase modulated output of the System Under Test is demodulated using a 
phase modulation test set. The harmonic levels are measured with a spectrum 
analyzer and the total harmonic distortion is calculated. A low pass filter 
is used between test oscillator and modulation section to insure that the 
modulation drive signal has less than 0.3% distortion.

John, K1AE

----- Original Message ----- 
From: "Mark Kahrs" <mark.kahrs at>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at>
Sent: Sunday, September 20, 2009 12:26 PM
Subject: [time-nuts] HP 8660C-K10 phase modulation test set

> Among my mistaken acquisitions over the past is a phase modulation
> test set for the 8660C (model 8660C-K10).
> I've put two pictures here:
> This looks like a type of phase noise test set: there is a LO in a
> sealed box in one corner.  There are mixers and detectors and a
> divider board.
> I thought I would see if there was any interest from time-nuts before
> I put it on the usual auction site.
> _______________________________________________
> time-nuts mailing list -- time-nuts at
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