J-POLE ANTENNA  

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

    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.

Download Complete Plans in PDF format

 

 

The Technet
HAVE FUN
DESIGNING YOUR OWN J POLE
FOR ANY BAND! 
(try it with aluminum too!)
either way....TRY IT!
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Design your J Pole for hf,
2 meters, 220, 440 and up
On most of the J Pole designs out there, a choke should be used as close to the feed point of the antenna as possible to help prevent rf on the feed line 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 feed point on 2 meters.
Hint....
Use the last part of your feed line as the choke before attaching to the feed point!