j pole antenna design pdf

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DBJ-UHF was developed from a grant from AC Daughty to develop a low cost medium gain MESH antenna for UHF. This designs measurements are specific for the frequency ranges indicated previously The design can be changed for resonance by altering the.

9 Simple J Pole Antenna Projects

The most recent antenna I replaced with a J-pole was a 2 meter see figure 1b aluminum base station commercially built amateur antenna purported to have more than 3 db gain over a dipole.

. The MARSians mass produced this antenna during the VHF frenzy in the mid-80s. Technically the J antenna is an end-fed ½ λ antenna that uses a ¼ λ matching stub. Commercial collinear base antennas multiple ⅝ wave elements means more gain lower takeoff angle.

This antenna does not need a ground to operate correctly. The J Pole antenna is a simplified version of the Slim Jim antenna using the same matching stub principle. Simple J-Type 10m Vertical by W6IOJ Sept.

The length of the antenna is three quarter wavelength. 220 Super J-Pole Antenna by KA0NAN May 1996. Other very good J antenna designs published in 73 Magazine have been.

If installed per the dimensions above the antenna should have an SWR of less than 151 at both 146 and 444 Mhz. 9 Simple J Pole Antenna Projects. Copper Dual-Band Super J-Pole Antenna by KA0NAN April 1993.

Don Murray W9VE Building a Dual-Band Antenna Mentorfest 102304 16 An Even Better J-Pole - Electrically The gain is about 74 dBi. Carr Design by G. 6 J POLE ANTENNA.

This results in an insulator action or decoupling B B A. Indeed although many folks like to. Copper Cactus 2m J-Pole by KE7AX February 1992.

This antenna design does not need a ground plane and is ideal for mounting inside PVC piping to protect it from the elements. However if mounted outside then an earth ground to the conduit is recommended. This is basically what this design is-only mechanically mounted on a mast.

A J-pole antenna K4KRW Collinear J-Pole Bob K9TMUs Slim Jim Variation on J-pole dual band easily built from a piece of 450 ohm ladder line. After taking it down I found a number of. CB Antenna mounts SO-239 to 38-24 adapter 300Ω TV twinlead.

Its basically an end-fed omnidirectional half-wave antenna matched to the feedline by a. This is important because if the mast extends above the antenna ground plane it will affect the performance of the antenna. It radiates and receives in an omni-directional pattern.

There was a simple way to convert a 2 meter J-pole into a dual band J-pole DBJ-2 was developed from the successful performance of the DBJ-1 but folks requested a portable version. A 6 Meter J-Pole Antenna Author. J-P01e By Michael P.

The J Pole antenna is a popular antenna design among amateur radio operators because it is effective and easy to build. 440 Super J-Pole Antenna by KA0NAN April 1996. Parts needed 10 ft of ½ copper pipe 3 T Fittings 3 M to F 90 degree elbow fittings 1 reducing fitting 3 feed lines of 50 ohm coax V.

Benefits - Ground plane independent - Simplicity - Built in triplexer effect 3 feed lines - Simultaneous transmission - No Bleed over between bands - Assumed gain. 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.

J-Pole Antenna Plans printable PDF format 800 kb This is a flexible antenna that is easy to build inexpensive and very handy to have in your emergency communications kit. 522004 43307 PM. The J-Pole antenna became so popular in the VHF band because of its simplicity in design and construction.

A DISCUSSION OF ANTENNA THEORY by Paul Graham K9ERG J Pole Calculator and drawing by K4ABT G. Copper Cactus Dual-Band Super J -Pole Antenna Project 2 meter 70 Cm Home brew antenna All the materials except the S0239 fitting can be found at any good hardware store and the whole antenna can be made in less than an hour. 2 practical antenna design 140 -150 mhz vhf transceivers online edition elpidio latorilla ledf media.

220 MHz not only has repeaters but has become a. The J-Pole also matches the high impedance at the end of a ½ wave radiator. KF4EOKS 2 meter super j-pole antenna build SUPER J-POLE FOR 435MHz by VK6YSF The World Wide Web Prepared By Paul Howarth VK2GX.

From the book the slim JIM was developed based on the basic J-Pole design see Fig1. DINENSIONS ARE FOR 51. This antenna can be rolled up for easy portable use and will outperform a rubber ducky.

The basic J is reported to have 3dB of gain over a ¼ λ ground plane antenna and 6dB over an isotropic theoretical antenna. The performance of this J-Pole is theo-retically at least equal to a ¼ wave radia-tor over an ideal ground. This picture shows that the base of the antenna is mounted flush to the top of the mast.

In my design I use 12 copper schedule M tubing and 14 soft copper tubing. The Tri-band J-pole by KB6EPO III. The J-Pole pattern resembles that of an ideal vertical dipole because of its minimal interaction with the feed line.

Around plans for a simple J-Pole. I had experimented with. Copper pipe steel whips TV twin-lead ladder-line or metal rods.

This value is about 23-24 dB higher than the average gain of a single-radiator J-pole. 1 The antenna tuned easily and oper- ated well for a few years until nature did it in. Inefficient antenna produces a small-amplitude EM wave for the same feed power and converts most of the power into heat.

Kinsner VE4WK J-POLE ANTENNA FOR 2m 3 of 3 1 2 3 4 5 6 7 8 E D C B A E D C B A 1 2 3 4 5 6 7 8 5 June 1992 J-POLE PARTS LIST PROCEDURE P2 M1. The Yagi J-Pole and NVIS Dipole And a glance at Antenna Design using 3D EM Software Brian Mileshosky N5ZGT High Desert Amateur Radio Club 15 Feb 2013. V1 12 November 1992 r2 W.

Hood KD8JB 2323 Jefferson Drive SE Grand Rapids Ml 49507-3148 number of years ago I built a J-Pole antenna from some scrap aluminum tubing and a 5-foot stick of TV mast. The antenna plans includes design dimensions for 2 meters 220MHz 440MHz and. Buck Rogers Sr Practical Antenna Handbook by Joseph J.

J-Pole Match A different connection is possible -that is A to C. The J can be made from almost any material. The J-pole I replaced at node K4ABT -7 alias 007 has increased the average signal at fifteen 15 miles by more than 5 db.

Dual Band Vhf Uhf Twinlead J Pole Antenna Pdf Notes 201903101154 1