Phase noise is generated by the rig's LO and exists as a more broad band low level signal. Issue is more significant with modern day DDS than with older analog-type VFO sources. Guys who operate field day can relate...
73/jeff/ac0c www.ac0c.com alpha-charlie-zero-charlie -----Original Message----- From: MIKE DURKIN Sent: Friday, December 30, 2011 11:08 PM To: [email protected] Subject: Topband: BAD OT:Phase noise *** RE: digital on 1838 +/- Don't you mean IMD from the radio/amp driven past ALC? CW is a binary signal and no one complains of its "phase noise" ..... Mike KC7NOA > From: [email protected] > To: [email protected]; [email protected] > Date: Fri, 30 Dec 2011 22:59:09 -0500 > Subject: Re: Topband: digital on 1838 +/- > > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of [email protected] > Sent: Friday, December 30, 2011 10:47 PM > To: [email protected] > Subject: Re: Topband: digital on 1838 +/- > > > Jim > > >>>Consider this however, CW and digital modes like JT65 typically share > >>>the CW portion of the bands<<<. > > That is not the case on weak signal bands, and in special 6m, digital > modes are above 50.250 MHz, there is a clear reason for that, digital is > not a narrow mode, there are phase noises that can trash the band. > > > Regards > Jose Carlos > N4IS > > > _______________________________________________ > UR RST IS ... ... ..9 QSB QSB - hw? BK _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
