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

[Johan H. Bodin]

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

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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 :-)