Roy Lewallen wrote:
Jim-NN7K wrote:

All the above have merit-- One other use- in SOME installations, there
is a requirement to do D.C. isolation - Removal ot part of the sheath,
jumpered by a Capacitor (but if that is what this for, the cap would be
in place). And, as to the first comment, such a loop would have been
used as a direction Finder (the space between the broken shields was
the "sense area of the loop, and, if remember right, you "Null" in the
direction that the "loop" is perpendicular to. - Jim NN7K

Actually, the active loop is the outside of the shield, and the gap is
the feedpoint. Shielded loops have been discussed at great length on
this newsgroup (not because they're complicated, but because they're
impossible to understand until a person is willing to let go of some
common misconceptions). Anyone interested in these can find the previous
postings via a search at groups.google.com.

Roy Lewallen, W7EL

FWIW, there are several projects in the ARRL pubs, mostly for RDF, that
use a short piece of coax exactly as described as a loop.


--
Jim Pennino

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