I think no. White noise by definition is no statistic, therefore IMO it cannot be eliminated because at no time it has a defined phase angle.
73 de Peter > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > Marinos Markomanolakis, M.D. > Sent: Sunday, April 03, 2005 3:26 PM > To: [EMAIL PROTECTED] > Cc: elecraft@mailman.qth.net > Subject: RE: [Elecraft] RF Noise canceller ? > > Hi Peter, > Would this type of noise canceler not work on "white" noise also ? > 73, > Marinos, ki4gin > > >From: "Peter Zenker" <[EMAIL PROTECTED]> > >To: "'Marinos Markomanolakis, M.D.'" > ><[EMAIL PROTECTED]>,<elecraft@mailman.qth.net> > >Subject: RE: [Elecraft] RF Noise canceller ? > >Date: Sun, 3 Apr 2005 13:03:51 +0200 > > > >Hello Marinos, > > > >There have been several schematics using such technics over > the last 20 > >years. Most of them use a seperate short antenna, feeding the signal > >pase shifted into a combiner which combines the main Antenna Signal > >with the phases shifted extra antenna signal. This construction can > >reduce a lot of man made noise. > >I remember there was a commercial available stand alone unit > sold by a > >small english company. > >I myself built such a unit to help reducing my noise problem > especialy > >at 160m (I live in the middle of Berlin, Noise level in the > evening is > >> S7) But I forgot the unit during the time because I do not have an > >160m Antenna any longer. > > > >73 de Peter, DL2FI > > > > > -----Original Message----- > > > From: [EMAIL PROTECTED] > > > [mailto:[EMAIL PROTECTED] On Behalf Of Marinos > > > Markomanolakis, M.D. > > > Sent: Sunday, April 03, 2005 6:45 AM > > > To: elecraft@mailman.qth.net > > > Subject: [Elecraft] RF Noise canceller ? > > > > > > Just a question for the technically inclined group members: > > > > > > How feasible or worth the effort, would be the addition > of an option > > > to the > > > K2 which would sample RF noise from a ferquency close to the used > > > band,(tunable?) which is devoid of signals, phase invert and > > > reinject the noise to an IF stage or even the antenna > input in order > > > to cancel our the "white or pulse" noise components, > preserving the > > > desired signal ? > > > > > > Why similar circuits are not preferred in HF receiver designs > > > instead of DSP filters ? > > > > > > Similar circuits are commonly used in biomedical devices (called > > > linear averagers if I am not mistaken) and are very effective in > > > isolating electric signals from a particular organ eg > Heart in EKG > > > or brain area of interest in EEG, filtering out the > irrelevant noise > > > from the muscle cells... > > > > > > Just some food for thought. > > > > > > > > > _______________________________________________ > > > Elecraft mailing list > > > Post to: Elecraft@mailman.qth.net > > > You must be a subscriber to post to the list. > > > Subscriber Info (Addr. Change, sub, unsub etc.): > > > http://mailman.qth.net/mailman/listinfo/elecraft > > > > > > Help: http://mailman.qth.net/subscribers.htm > > > Elecraft web page: http://www.elecraft.com > > > > > > > > > > _______________________________________________ > Elecraft mailing list > Post to: Elecraft@mailman.qth.net > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
