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

[jrusgrove at comcast.net]

Agree on the 'counterpoise' as suggested by Johan. Even though my antenna is located over relatibely 
good ground (an old pasture) I noticed that the termination would need readjusting with dry vs. wet 
ground conditions. An eight wire ground system where the 'spokes' extend a small distance beyond the 
antenna stabilized the pattern.

Jay W1VD  WD2XNS  WE2XGR/2


----- Original Message ----- 
From: "Johan H. Bodin" <jh.bodin at telia.com>
To: "Discussion of the Lowfer (US, European, &amp;UK) and MedFer bands" <lowfer at mailman.qth.net>
Sent: Thursday, January 15, 2009 4:44 AM
Subject: Re: [Lowfer] Noise Canceler Effectiveness... How it REALLY works


> Hi Scott, Lowfers,
>
> some K9AY users have reported good results over poor soil or even rock. The
> antenna works with a few ground radials laid out on the GND below the antenna
> (without ground rods). It just needs some form of "counterpoise" for the E-field
> part to work. Poor soil may affect the vertical pattern but that's another story...
>
> I belive Bill's is correct - on LF, the K9AY is just a simple E-field probe
> (termination open) and a H-field probe (termination shorted). The termination is
> adjusted to get the proper balance between the E and H contributions to the
> output signal. As long as the antenna is small w.r.t. wavelength, the phasing
> will be correct thanks to the laws of physics :-)
>
> The E-field sensitivity will suffer if the ground resistance is high (it's all
> in series!) so you'll have to increase the termination resistance to get proper
> balance. This will in turn reduce the H-field sensitivity as well since the
> larger termination is in series with the loop too...
>
> A picture of my hombrew K9AY is here: http://www.aytechnologies.com/
> Click "Comments and User Stories" on the left side.
>
> 73
> Johan SM6LKM
>
> ----
>
> Scott Tilley wrote:
>> I have dreamed about a K9AY antenna but at my new QTH I am
>> ground challenged and from what I understand the K9AY requires
>> a good ground under the 'loops' if that's what they are :-)
>
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