A gain J-pole has extra element(s) separated by a phasing network.
Google has several hits for Super J-Pole and perhaps the best
I found is at:
http://rbsfm.ej.am/joomla/index.php?option=com_contenttask=viewid=43Itemid=26
which goes into more detail.
The design I used was publicized many years ago by
a packet group out of the mid-west which used a 1/2
wave phasing coil separating the vertical elements.
I liked this approach since it got rid of the unwieldy
loop phasing network and thus allowed a fit inside
the Stationmaster radome.
Jack - N7OO
- Original Message -
From: John Sehring
To: Repeater-Builder@yahoogroups.com
Sent: Wednesday, September 09, 2009 12:23 PM
Subject: [Repeater-Builder] J-pole
What exactly is a gain J-pole? Am familiar with J-poles, but... Sounds
interesting.
--John
===
Our ultimate solution was to replace the copper pipe
dipoles with a gain J-pole made out of #12 copper wire
and hung inside the radome from the tip. The J was
found to have feed line reflections which was solved
by adding a coaxial stub at the exterior feed point. This
flattened the line and preserved the radiation pattern of
the J. A lot of fussing but the end result was a light
weight antenna with a gain and radiation pattern very close
to that of the original Stationmaster.
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