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

[Bill Ashlock]

Hi Alan,
 
I think this antenna is far too small (WL wise) to have the properties you describe. The basic antenna looks like a small loop and a E-field sensing antenna to me and I believe the resistor is introducing what is sometimes referred to as an "Antenna Effect" or an undesired susceptibility of a loop to the E field, which tends to modify the figure "8" pattern - but in this case it is adjustable and becomes a desired effect. Any comments from others?
 
Bill > From: alan.melia at btinternet.com> To: lowfer at mailman.qth.net> Date: Wed, 14 Jan 2009 14:39:24 +0000> Subject: Re: [Lowfer] Noise Canceler Effectiveness... How it REALLY works ??> > Hi Ok on the loops but this form of noise canceller works with two end fed> wire antennas too...... which dont have "fig of 8" patterns !!> > On the K9AY I have reservations about that explanation too because the K9AY> is not a loop....it is more like a travelling wave antenna. It may be the> model works, but I prefer to compare it with a coupled line. Think of a> directional coupler only here the coax/waveguide is the earth ionosphere.> Then the coupled line is a line terminated in a resistor where a signal> from one direction is absorbed in the matching resistor. The matching> resistor need changing depending on the direction in the K9AY ....varying> the orientation of a pick-up loop in coax changes it impedance, and so> requires a different termination. Any comment ?? There are elements of this> in a Beverage too.> > Alan G3NYK> > > > _______________________________________________> >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/df56d081/attachment.html