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!
J-Pole Antenna Design
SAVE TIME BY USING THE CALCULATOR BELOW.
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.
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"........
Convert a J Pole to a Slim Jim
More Antenna Projects!
Do not install ANY antenna over, under or near power lines!
HAVE FUN...NOT A FUNERAL!
J Pole Calculator and drawing used on this page are
K4ABT G. E. "Buck" Rogers Sr
See his articles in back copies of CQ Magazine
(The Packet Users Notebook)
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Portions of this page copyright Hamuniverse.com
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