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

[Dave Brown]

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