J-Pole Vertical Antenna – VHF 144-146Mhz (2m) Amateur Band



J-Pole Vertical Antenna - VHF 144-146Mhz (2m) Amateur Band

J-Pole Vertical Antenna - VHF 144-146Mhz (2m) Amateur Band

£125.00 — £230.00

Product Code – 145-JPOLE

A J-Pole Antenna for the 144-146Mhz (2m) Amateur band. The ‘J-Pole’ Antenna consists of a half wave vertical radiator and an adjacent quarter wave tuning stub which forms the classic ‘J Shape’. The J-Pole has an added advantage that tuning can be varied over a fairly wide frequency range by moving the feed-point location up or down. This also gives the user finer control over the impedance and match. The antenna is end fed and has an omni-directional radiation pattern and requires no ground plane or radials. Each Vortex J-Pole is also de-coupled from the main mast using a heavy duty fibreglass spacer.

J-Poles should include a 1 to 1 ‘Choke Balun’ close to the feed-point, which prevents feed-line radiation. A simple and cost effective solution is to wind a small length of coaxial cable around a former as shown in the images. Vortex can also supply this if required in commercial grade ®Westflex 103 Coaxial Cable . A Vortex Antenna Systems premiumFerrite Core 3kw Choke Balun (Sealed to IP67 rating) is also available as an optional extra.

No Knowledge of Antennas? Our 144-146Mhz antenna is pre-tuned from the factory and all set-up measurements are included. However the system is fully adjustable should the user require to finely tune the system for their own requirements. We include a full set-up instruction sheet with each antenna.

All Vortex Antenna Systems J-Poles use heavy duty components including our h/duty element clamps with M10 Stainless Steel Allen Head Bolts and hardware as also used in our lower frequency base antennas. The main element section of the antenna is genuine VORTEX 6082-T6 or *AA6082-T6 Aluminium, with 16 and 12.7mm tube for the matching section.

® WH Westlake Electronics
See info below for mechanical and electrical details

  J-Pole Vertical Antenna – VHF 144-146Mhz (2m) Amateur Band

Band(s):  2m (144-146Mhz)
Element Material:  6082-T6/*AA6082-T6
Optional Mounting Kit:  Genuine ‘Vortex’ Stainless Steel U-Bolts and Saddle Clamps
Gain:   2.9dbi
Feed:   Coax via small fly-lead to radiator and ‘J’ stub
Matching:   None – Direct fly-lead to Feedpoint. Positioned for best match
Rating:   3.5kw
Bandwidth:   1.5 to 1 SWR bandwidth approx 5.5MHz
Element Clamps:   Stauff (Germany) – heavy duty polyamide series
Antenna Weight:   3kg
Hardware:   304/316 stainless steel

*If available