[TowerTalk] Comparing Hi-Z Receive Arrays and KB7GF Shared Apex Loop

[Rik van Riel]

On 08/13/2013 10:31 AM, Dan Schaaf wrote:
> The HiZ clearly outperforms the K9AY loop and coax mag loop. Probably
> will also outperform the SAL. The HiZ 4 square and 4-8 Pro  is a phased
> array and so removes noise from 3 of the 4 directions and occupies
> approx 80 x 80 feet.. The HiZ 8 circle array removes noise from 7 of 8
> directions. But requires a much larger piece of real estate. Removing
> the noise makes the signal of interest audible.

The SAL is an array of 2 cross-fed magnetic loops, which ends up
attenuating power from both sides (like magnetic loops do), and
from the rear (achieved by cross-feeding them).

It has 4 loops, so the 2 cross-fed magnetic loops can be in 8
different directions, using either 2x single loop, or 2x two
loops in series, cross-fed.

I do not know how the RDF of the SAL compares with the HiZ,
though.  I expect both will beat the K9AY's cardioid pattern.

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