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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.
NOTE: Coax center conductor attaches to the
 "Long section" feed point.
Shield attaches to the short section feed point.


Enter The Operating Frequency
(use your mouse to clear the window then enter your frequency) 

   Freq MHz

A (Long section) dimension is:  feet,    inches,      meters

B (Short section) dimension is:  feet,    inches       meters

C (Feed point) dimension is:       feet,    inches       meters

D (Spacing) dimension is:           feet,   inches,     meters

Inside (spacing) dimensions are metal to metal measurements, NOT center to center.


 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 








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

Don't want to build but rather buy? Want a J Pole for your Go kit or backpacking, or emergency communications?
Check out the many options Amateur Radio Suppy can offer. Many other antenna options also. Check them out!

Convert a J Pole to a Slim Jim
More Antenna Projects!

DANGER!
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
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

Portions of this page copyright Hamuniverse.com

 

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