On Mon, 15 Mar 2004 15:57:00 +0100, Toni wrote:
Then I read about mag-loops having better RX noise immunity than
normal antennas because they react to magnetic fields, whilst
man-made noise occurs mostly on electrical fields.

Hi Toni,

The noise that is very local, or within one or two wavelengths of its
source has a different field than that which propagates in from across
town, or region, or country....

This would be noise from fluorescent lighting, TVs, Computers, motors
and such within the neighborhood or home. That same noise coming from
across town has a different field structure and it conforms to your
expected reciprocity.

But really, this is a matter of luck and the polarization of the loop
too. Most of that noise is vertically polarized. The loop in the
horizontal position may show more sensitivity than in the vertical
position. Further, the noise may be coupled electrostatically rather
than electromagnetically.

73's
Richard Clark, KB7QHC