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  • CB J POLE  Zepp Antenna 3/4 wave CB 11m Band DX and local Antenna

CB J POLE Zepp Antenna 3/4 wave CB 11m Band DX and local Antenna

  • Brand: Wire Antennas UK
  • Product Code: J POLE / Zepp Antenna 3/4 wave CB 11m Band local and DX
  • Availability: 13

  • Short Description: 3/4 wave J POLE Antenna

  • £51.00

  • Ex Tax: £51.00

A redesign from the US Military Version .

The J-Pole is an older antenna design that’s been around a while, but not widely used or thought of these days.  It is a vertically polarized antenna with two elements: a ¾ wavelength radiator and a ¼ wavelength matching stub.  It operates as an end-fed half-wave antenna.  The ¼ wave stub cancels out ¼ wavelength of the ¾ wavelength radiator, thus leaving ½ wavelength to radiate.  The J-Pole does not require any ground radials and has a antenna gain of 2.4dB over isotropic (a half-wave dipole is 2.1dB gain over isotropic).  The formulas for the ¾ wave radiator and ¼ wave stub are:

L ¾ wave radiator = 8856 times velocity factor divided by frequency in MHz = length of ¾ radiator in inches
L ¼ wave stub = 2952 times velocity factor divided by frequency in MHz = length of ¼ wave stub in inches

The general design for a twin-lead Zepp is a 50Ω coax feedline, a λ/4 matching section, and a λ/2 radiating section. The feedline taps on near the bottom of the matching section.


 

 

A redesign from the US Military Version .

The general design for a twin-lead Zepp is a 50Ω coax feedline, a λ/4 matching section, and a λ/2 radiating section. The feedline taps on near the bottom of the matching section.

Built for the CB Band for the frequency values ​​from 27.0 Mhz to 27.9 Mhz this is a 3/4 wave antenna.


The below sweep is 26.95 MHz to 27.500 MHz ( USA ) spectrum but the antenna can be tuned for the complete CB band with a small adjustment. 


Hang and Play !

 

Overall size is 7.7 meters

Clients Review



James Ager / uk 21/04/2024

A very well made antenna. I have made contacts in North America Russia and the Canary Islands using only 12 watts of power very pleased with it's performance

Jim Ager Cumbria u.k. 21/04/2024

Fantastic antenna very well made. Works very well on my DX Commander classic 10 mtr pole. I have made contacts to the Northern United States Canary Islands Crete and Russia using only 12 watts of power. Highly recommended.

Phil Manley / USA 16/04/2022

My third antenna from this company. Workmanship of antennas is superb with a good eye to detail. Each antenna was tested before shipping.
First Class thank you.

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