Re: LF: Balanced vs. Unbalanced loops

["Dick Rollema" <d.w.rollema@freeler.nl>]

To All from PA0SE 

Jim, M0BMU wrote:


> I also find that external
> effects affect the depth of null you get - in my field strength measuring
> experiments, I found some locations where there was almost no null - This
> seemed to occur near overhead wires and power lines, which were
> presumably acting as parasitic antennas, inducing signals in the
> loop.

Also beware of conductors you don't see: underground cables, pipelines
etc. When I do FS measurements  I always walk around a bit at a
location with my portable instrument.  When moving around makes the
FS fluctuate measurements will be unreliable.  A road with lamp
posts is always suspect as in our country  the lamps are fed from an
underground  cable along the road.

73, Dick, PA0SE