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HAVE FUN
DESIGN YOUR OWN J
POLE
FOR ANY BAND!
(Try it with aluminum
too!)
Either way....TRY IT!
Design your J Pole for hf,
2 meters, 220, 440 and
up!
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J-Pole Antenna Design
SAVE TIME BY USING THE CALCULATOR
BELOW.
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On most of the J Pole designs out there, a choke
should be used as close to the feedpoint of the antenna as possible to
help prevent rf on the feedline and creating difficulty with SWR readings.
For 2 meters, the coil is 4 turns of coax at 5 inches in diameter. You
should get good results with the choke within 3 or 4 inches of the
feedpoint on 2 meters.
Hint:
Use the last part of your
feedline as the choke before attaching to the
feedpoint!
Hints from
builders:
"Iv'e built my j-poles out of 10ft sticks
of 1/2" emt conduit. Drill a 1/4" hole at the place where the "J"
goes. Make the "j"out of 1/4"
soft copper, Solder it in place thru the hole and add
the cable. Cost about $6 using new parts.
If you need a "super" j, use
a piece of 3/4" pvc as the insulator and add the stub and another 38 or so
inches of conduit. still really cheap"........
Dave,
WB5HDS
Convert a J Pole to a Slim
Jim
More Antenna
Projects!
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DANGER!
Do not install ANY antenna over, under or near
power lines!
HAVE
FUN...NOT A
FUNERAL!
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J
Pole Calculator and drawing used on this page are
Copyrighted by
K4ABT G. E. "Buck" Rogers Sr
k4abt@packetradio.com
www.buxcomm.com
www.PacketRadio.com
See his
articles in back copies of CQ Magazine
(The Packet Users
Notebook)
Copyright 1996
All rights reserved
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