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Rollup J pole
[J-Pole]
$25.00

Portable Wire J-Pole Antenna 2 Meter Band

 

  • For Emergency, Portable, or Home Use
  • Extend Your HT's Range
  • 52" 300 Ohm Weather Resistant Flat Twin Lead
  • 70" RG8X Ultra Flex Low Loss Coax Cable
  • PL259 Connector 
  • Handles 50 Watts

These antennas are hand built , Only high quality components are used.  300 ohm weather resistant flat twin lead and ultra flex low loss RG8X coax terminated in a PL259 connector are used in the construction.  Improve your range with this antenna.

If you need a custom design, please email us your requirements.

Some facts about J Pole antennas:

The Wire J-Pole Antenna is ¾ wavelengths long total.  The end ½ wavelength radiates radio waves like a vertically mounted dipole antenna.  Unlike a dipole it has high impedance (about 2000 to 4000 ohms) because it is end fed.  The first ¼ wavelength of twinlead is an impedance matching section required to match it to the low impedance coax.  A ¼ wavelength feedline transforms high impedance to low impedance.  The coax is soldered 1 ¼ inches from the end of the twinlead to match 50 ohms impedance.

The 2 Meter Wire J-Pole Antenna SWR will also function from 440 to 450 MHz but unfortunately its gain is ¼ of that on 2 meters (-6 decibels) and the maximum vertical radiation is at 44°.  All 2 Meter J-Pole antennas operate equivalent to rubber duck (compact) antennas on 440 MHz. The only true dual band J-Pole antennas use an impedance trap or second radiating element for 440 MHz.  This is why we do not call our J Pole a dual band J Pole. 

When installed vertically the Wire J-pole Antenna radiates the same in all horizontal directions with maximum vertical radiation about 25° above the horizon.

The coax used is also a major consideration.  RG8X has lower loss and still remains flexible.

Coax Type           Loss at 150 MHz*            Loss at 450 MHz*            Loss at 150 MHz**            Loss at 450 MHz**
  RG-174                      13.0 dB                             25.0 dB                             0.78 dB                               1.50 dB
  RG-58                          6.2 dB                             10.6 dB                             0.37 dB                               0.64 dB
  RG-8X                          4.7 dB                               8.6 dB                             0.28 dB                               0.52 dB

* 100 feet.
** 6 Feet

This product was added to our catalog on Tuesday 05 August, 2014.
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