-177 = the -174 dBm/Hz SSB thermal noise floor at 25C, less 3 dB to account for the usual assumption that half of it is AM, half PM.
dBm/Hz is obviously equivalent to dBc/Hz for a 0 dBm carrier. Anyone who claims to measure noise in a 1 Hz bandwidth below -177 dBm/Hz at room temperature is either doing something wrong somewhere, or doing something amazing somewhere. -- john, KE5FX Miles Design LLC > -----Original Message----- > From: time-nuts [mailto:[email protected]] On Behalf Of Mike > Feher > Sent: Thursday, August 11, 2016 4:15 PM > To: 'Discussion of precise time and frequency measurement' > Subject: Re: [time-nuts] State of the art of crystal oscillator measurements > > That is why I asked what the Po was. Where did the 177 come from? L(f) is > single sided. This is not my first "rodeo" in these matters. 73 - Mike > > Mike B. Feher, EOZ Inc. > 89 Arnold Blvd. > Howell, NJ, 07731 > 732-886-5960 office > 908-902-3831 cell > _______________________________________________ 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.
