In article .com,
"Jeroen" wrote:

Telamon wrote:

You don't want the two loops to actually touch each other and mounting
the pickup on the other side of the PVC pipe is an easy way to
accomplish that.

Yes, but why not allow them to touch eachother? What's the reason for
it?

Just hoping to get a (physics) reason for why they shouldnt be too
close togheter, jst to further udnerstand the nature of the thing
better I havent came acros any descriptions that said they shouldnt
be too close, so I'm really curious.

Two things referring to the link http://www.kr1st.com/swlloop.htm

1. The tuned loop and pickup loop are supposed to couple magnetically.
The tuned loop is bare copper and it looks like the pickup is made of
bare wire so if they touch they will have a direct circuit connection.
If you use magnet wire for the pickup you are counting on a thin layer
of enamel paint to insulate one from the other, which can easily be
abraded.

2. One parameter controlling Magnetic coupling between the loops is
distance. You already know this and the loop will tune a little sharper
if the pickup loop does not load it as much as when the loops are
physically together.

--
Telamon
Ventura, California