[Lowfer] Noise Canceler Effectiveness... How it REALLY works

[Bill Ashlock]

>>But its not the principle, so much as the methods of implementation, that are of interest.
 
With all due respect I think both are of equal importance.
 
Bill> From: tractorb at ihug.co.nz> To: lowfer at mailman.qth.net> Date: Thu, 15 Jan 2009 01:26:11 +1300> Subject: Re: [Lowfer] Noise Canceler Effectiveness... How it REALLY works> > Correct. The principle has been round since the dawn of (radio DF) > time.> No magic involved and nothing new under the sun, etc.> But its not the principle, so much as the methods of implementation, > that are of interest.> 73> Dave, ZL3FJ> > ----- Original Message ----- > From: "Bill Ashlock" <ashlockw at hotmail.com>> To: <lowfer at mailman.qth.net>> Sent: Thursday, January 15, 2009 12:54 AM> Subject: Re: [Lowfer] Noise Canceler Effectiveness... How it REALLY > works> > > > Gentlemen:> > After reading the description of the VK5BR noise cancelling circuit it > appears to me this is nothing more than the old trick of combining the > figure "8" pattern from a loop antenna and the circular pattern from a > long wire antenna to form a cardioid pattern. If the amplitude and > phase of these signals are properly adjusted the cardioid can have a > noise-reducing null of at least 30db. A separate receiver connected to > each antenna could be also used along with the proper amplitude and > phasing adjustment to do the same thing. BTW the popular K9AY antenna > uses exactly the same principle by introducing a controlled E field > distortion to the normal figure "8" pattern that this antenna would > normally have.> > Bill Ashlock> > > --------------------------------------------------------------------------------> > > > _______________________________________________> >>From the Lowfer mailing list> > Send messages to: Lowfer at mailman.qth.net> > To sub/unsub visit: http://mailman.qth.net/mailman/listinfo/lowfer> >> > > --------------------------------------------------------------------------------> > > > No virus found in this incoming message.> Checked by AVG - http://www.avg.com> Version: 8.0.176 / Virus Database: 270.10.7/1893 - Release Date: > 14/01/2009 06:59> > _______________________________________________> >>From the Lowfer mailing list> Send messages to: Lowfer at mailman.qth.net> To sub/unsub visit: http://mailman.qth.net/mailman/listinfo/lowfer
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.qth.net/pipermail/lowfer/attachments/20090114/87043742/attachment-0001.html