Need Dimensions for Ladder Line J-POLE

[The Signal Group]

I've lost my CQ magazine that has the article for constructing
a J-POLE antenna for 2m from 450 ohm Ladder Line ( instead of
TV Twin Lead).

If you have this article or information handy , I would appreciate
an email of the details. Ladder line is available with solid con-
ductors or stranded conductors.....I'd like the dimensions for
both if the article stated there was a difference in dimensions
of J-POLEs made from the two types. I have both types of Ladder
Line for some experiments I'm going to conduct.

Thanks,
Mike /NT4O

Mike Wood Internet: mike...@mercury.interpath.net
The Signal Group Amateur Radio: NT4O
P.O. Box 1979 ***Avoid company disclaimers by owning the company ***
Wake Forest, NC 27588

Phone: 919-556-8477 Fax: 919-556-0115
.

[Thomas W. Castle]

The 450 ohm ladder wire j-pole specs' are as follows...

Take at least a 60" piece of 450 ladder wire; skin the 2 wires
at one end approx 1/2" each.

Bend them over towards each other and solder them together...

Then measure one side of the ladder wire to a dimension of 58"
from the soldered ends and cut it off there....

On the other side of the ladder wire, measureing from the soldered
ends to 19" and cut there. Then remove the piece of wire abt 41" by
cutting the webbs; this will leave you a j-pole looking piece of 450
ladder wire.

Now measure up about 3 & 1/2" from the solder joint on each side
of the ladder wire an clean an area for you to terminate your coax
feed line to... The center conductor to the long side an the sheild
to the short side. The positioning of the coax on the ladder wire
will determine quite a bit about your SWR. By trimming an moving
coax along the ladder wire you can tailor the j-pole to preform
to where you want it.

BTW> This antenna works on 70cm as well as on 2 mtrs at the same
time. So this will preform as a dual band antenna. I encapsulate
mine in PVC pipe 3/4" & 1/2" with a reducer just above the end of
19" leg going to the 1/2" size pipe, with a cap glued on top. This
allows me to either mast or roof mount it. The wire dimensions here;
have been adjusted for the reaction to the pvc pipe enclosure...
Hope this helps... De Tom KD4QHH

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19" side 58" side

Good Luck...