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

[Bill Ashlock]

Scott,
 
Sorry.  I got into to this rather late and read most of the postings on this subject in random order.  I didn't see your original post until I had posted my first. You must feel like you opened up a can of worms? 
 
Speaking strictly for myself I'm glad your question appeared because I wasn't sure if my understanding of how this works was correct until some reinforcement came through. The working principle for the K9AY is still up for debate but that identifies another one of the beauties of this type of interactive education.
 
Bill 



Date: Wed, 14 Jan 2009 08:52:20 -0700From: sthed475 at telus.netTo: lowfer at mailman.qth.netSubject: Re: [Lowfer] Noise Canceler Effectiveness... How it REALLY works
 Hi Bill
 
Nothing new was claimed.  It was simply a reminder that this type of stuff really works to help someone who asked along time ago in the thread...
 
73 Scott
 
 
On Jan 14, 2009, ashlockw at hotmail.com wrote: 

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    

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