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!

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)

88.1 Freq MHz

A (Long section) dimension

is: 8

feet, 96

inches, 2.438

meters

B (Short section) dimension

is: 2.66

feet, 31.92

inches 0.811

meters

C (Feed point) dimension

is: 0.26

feet, 3.12

inches 0.079

meters

D (Spacing) dimension

is: 0.25

feet, 3

inches, 0.076

meters

Inside (spacing) dimensions are metal to metal measurements, NOTcenter 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. 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"........

KUNG WALA SANG COPPER TUBE PWEDE NA ALUMINUM TUBING,

GAMIT KA LANG STAINLESS HOSE CLIP PARA SA PAGSUGPON SANG

ALUMINUM KAY INDI MAN MADUTLAN SULDA, KAG ANG SPACER SA J

SA BABAW PARA PAG-ON GAMIT KALANG PVC PIPE OR ACLYRIC

PLASTIC.

ALPHAVIC COMMUNICATION