[ARC5] DF-ing.

[Kenneth G. Gordon]

On 3 Jul 2013 at 7:25, J. Forster wrote:

> My understanding of the pattern of a loop alone in free space is a
> figure-8 with both nulls in the plane of the loop.

Correct.

> Adding in the sense antenna, degrades one of those nulls, (and
> possibly improves the depth of the other) by adding in a roughly
> omnidirectional signal.

Yes, to both statements.

However, as Mike points out, there are many, many factors that can degrade 
that null.

Supposedly, the "perfect" result of adding a properly-phased signal from the 
"sense" antenna is to completely eliminate one null of the figure-8, and at the 
same time, enhance the other one, i.e., making it deeper and sharper.

However, actually achieving that "perfect" result is practically impossible in 
normal use. Most of the time we have to settle for "good enough".  And 
sometimes, given external factors, that "good enough", isn't.

Ken W7EKB