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Old July 8th 07, 05:00 PM posted to rec.radio.amateur.antenna
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Posts: 409
Default Horizontal Attic Loop Feed


"afcsman" wrote in message
...
Wayne wrote:
Looks like I'll have to use a horizontal loop in the attic for a few
months. Any opinions on how to best feed it?
--open wire
--coax coil balun
--ferrite bead balun
--straight coax

The loop is about 13 feet per side, and I want to operate 20 meters and
up. In the past I have simply used a coax feed without a balun. It
worked OK, but there was a lot of stray RF around the house.

TIA


SWR loss is less of a headache with open/ladder line feed.
My principal DX antenna is an 8jk end-fire array cut for 20 meters. I've
fitted it in the attic of all the homes I owned, fed it with ladder-line,
and worked it with a "classic" balanced tuner on 30 through 10 meters.
Yes, RF does get into the wiring (especially triggering slightly opened
lamp dimmers), even with good grounding. The array is a gain antenna, and
has given me very good results over the past 35 years I've operated with
this antenna.

W9NPI


The JK sounds great, but I only have a square area of about 15 feet per
side. My previous operation has been with coax and no balun. What methods
have you used to run the open wire line from the shack up into the attic?


 
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