J-Poles
You will note some redundancies in these designs and links, but
if one link should die others should have the information
J-Pole Very informative article
http://www.cvarc.org/jpolescl.htm
http://www.qsl.net/ai4hb/jpole.html
http://www.mvw.net/radio/jpole.html
http://www.sedan.org/ant.htm#jpoletv
=== 2m/70cm Dual Band J-Pole made from 300 ohm twin lead ===
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54-1/4" |
| 38-1/2"
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| 15-3/4"
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| 1/4" |
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Coax Inner Coax Outer
Conductor Conductor
SWR is 2:1
across the 2m band and from 435mhz to
450mhz on the 70cm band.
1. Use good quality TV twin lead.
2. Strip insulation at the solder point for coax feedline.
3. Cut out and remove the 1/2" long notch N.
4. Feed with a length of 50 ohm coax and terminate with the
appropriate connector. Tape coax at
feedpoint to the twin lead,
or use heat shrink, and make sure the joints
are insulated from
each other.
5. Antenna may be sleeved inside 1/2" PVC for outside
mounting or
hung on a loop of string run thru hole O.