Hi That's another confusing point if you go back far enough. There was a tradition of assuming no correlation for broadband noise and correlation for anything with a noise slope. That gave you a 3db / 6 db switch point in the data as you went flat.
Bob -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bruce Griffiths Sent: Tuesday, January 15, 2013 4:10 PM To: Graham / KE9H Cc: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Thermal noise contribution to phase noise Graham / KE9H wrote: > Bruce: > > The last time I looked, the thermal noise floor was still -174 dBm/Hz > (at 300 Kelvin). > > http://en.wikipedia.org/wiki/Thermal_noise > > Are you saying Boltzmann's constant is off by 3 dB, or are we mixing > apples and oranges here? > > Is there a 3 dB adjustment between noise floor (at room temperature) and > the "single side band" phase noise measurement, which only looks at half > the noise, since it only looks on one side of the reference signal? > No the noise in the upper and lower sidebands are correlated Thus the DSB PN is 6dB greater than the SSB PN. Bruce _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.