Hi Ian,

Some old wives even extoll the virtues of screening the coupling loop of a
magloop.

It may be kindly said that screening a loop at least does no harm.

But the screen greatly increases capacitance across the loop and thereby
restricts the tuning range of the proper capacitor. The number of turns has
to be decreased. Or in the case of a single-turn loop its diameter must be
reduced which also rapidly reduces receiving sensitivity.

I've a feeling it also degrades loop Q. It certainly can't improve it.
----
Reg, G4FGQ

========================================

"Ian White, G3SEK" wrote in message
...
Reg Edwards wrote:

If there's a problem it is more likely to be picked up on the feedline
which is not influenced by the presence or absence of a screen around
the loop.

Agreed

If something must be screened then screen the feedline.

It generally is screened already (coax) but it does need some kind of
balun.

It's amazing how many loop designs are paranoid about balancing and
screening the loop itself, but then connect the coax in a totally
unbalanced way. The result is a beautifully balanced loop in parallel
with a vertically polarized random wire.



--
73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB)
http://www.ifwtech.co.uk/g3sek