On Wednesday, October 14, 2015 at 1:34:16 PM UTC-5, rickman wrote:
So if the shield has little to do with rejecting near field electrical
noise, what does the shield do?

A shield with the usual gap promotes balance.
And a small loop with a gapped shield is no quieter than a regular solenoid
or pancake wound loop.
Much of the usual "magnetic loop" theory that is on the web is malarkey.
A small loop is a small loop is a small loop as long as all are properly
balanced.

wrote:
On Wednesday, October 14, 2015 at 1:34:16 PM UTC-5, rickman wrote:
So if the shield has little to do with rejecting near field electrical
noise, what does the shield do?

A shield with the usual gap promotes balance.
And a small loop with a gapped shield is no quieter than a regular solenoid
or pancake wound loop.
Much of the usual "magnetic loop" theory that is on the web is malarkey.
A small loop is a small loop is a small loop as long as all are properly
balanced.



Looking back, I now realize that there was a bit of confusion
between the Small Loops for transmitting and those for reception.
Until a short while ago Magnetic Loops was the term used for the
Small Transmitting Loops, and the lack of clarification which
exists in the ham vocabulary has occasionally been a problem. I
think it caused a bit of confusion here too, particularly in
the matter of multi turn loops!

Irv VE6BP