Product number : 11-J-Pole


price : 169 euro
 
Gain:                 2,4 dBI 
Gain: @ 10m height:   4,23 dBI
SWR bandwidth:        1300 Khz
Max Power:            >10Kw
Lenght:               8,0 meter
Weight:               5 Kg
Mast attachment:     < 50mm
Element diameter:     40 to 16 mm

 

 

 

 

The J-pole antenna is a mechanical 3/4 wave vertical antenna. With the main radiation coming from the top section.

In essence the J-pole is a halve wave radiator with a quarter wave matching stub underneath the antenna.

The matching stub illuminates the need for a coil (loss) and can handle immense high powers.

There are several different variants of J-pole antennas. ALL have a maximum gain of 2,4 dBI. (do not be mislead with figures higher as 2,4 dBI !)

Amongst those variety of J-poles you will find out there are difference in height and SWR bandwidth.

The HPSD  J-Pole has the height advantage. It is slightly higher compared to those others.

With the additional length it is logical the “horizon” has moved further away providing a wider range of coverage.

For the above reasons the HPSD J-pole can be considered to be one of the best vertical antennas for 27 MHz communication.

The J-pole comes of course with a RG213UBX RFCHOKE (2Kw)

 

 

The “real” antenna elevation plot.

(click to enlarge)

Real SWR Antenna PLOT

(click to enlarge)

 

 

 

 

The J-Pole made by HPSD, as ALL HPSD antennas is a heavy duty version, and will last a life time !

PDF DOWLOAD HPSD J-POLE HOW TO MAKE ONE IN DUTCH :   J Pole versie 1.01