[time-nuts] Thermal noise contribution to phase noise
Bob Camp
lists at rtty.us
Tue Jan 15 20:10:27 UTC 2013
Hi
It's not even that complex. Thermal noise is half phase noise and half
amplitude noise. The sum must equal -174.
Bob
-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Bruce Griffiths
Sent: Tuesday, January 15, 2013 2:38 PM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Thermal noise contribution to phase noise
I've noticed a disturbing tendency to quote the thermal noise
contribution to phase noise as -174dBm/Hz instead of the corrent value
of -177dBm/Hz as verified by measurement by NIST:
http://tf.nist.gov/phase/noisemeas.html
This error occurs in papers from Spectrum Microwave, Wenzel Associates
and others.
Blindly propagating the results quoted in the early literature isnt
particularly helpful given that the definition of SSB phase noise has
changed in the intervening decades.
Bruce
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