j pole antenna design pdf

sunnybernick62928 May 15, 2022 design , j , pdf , pole Comment

The construction plans presented in this newsletter are based on my new design and describe such an optimal antenna. If you need a super j use a piece of 34 pvc as the insulator and add the stub and another 38 or so inches of conduit.

Antenna Types J Pole Antenna Design

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

. They are electric fence posts and come in 4 lengths 79cents The coax center conductor attaches to the long side of the J and the shield attaches to the short side 14 wave matching section. If installed per the dimensions above the antenna should have an SWR of less than 151 at both 146 and 444 Mhz. 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.

Its basically an end-fed omnidirectional half-wave antenna matched to the feedline by a quarter wave transmission line stub. Copper Dual-Band Super J-Pole Antenna by KA0NAN April 1993. An efficient resonant antenna 14 wavelength or longer produces a large-amplitude EM wave for a given feed power and produces little heat.

The raw materials to construct this antenna consist of a 5 feet of 300 ohm twinlead use the cheap stuff not the foam filled or shielded variety b 6 feet of 50 ohm co-ax and c a suitable connector to attach to your rig. Generally people dont think of radio-frequency radiation in terms of discrete. 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.

Several other versions of the J-PoIe available. Improving Gain of the Super J-Pole Antenna - The collinear J-Pole often known as the Super-J does improve the behavior over a regular J-Pole. 440 Super J-Pole Antenna by KA0NAN April 1996.

And the 440-MHz J-PoIe 16 is 30 inches overall. The performance of this J-Pole is theo-retically at least equal. Can not obtain good VSWR on 440 but the 2m gain is outstanding about 6dbd worth EXPERIMENT create you own unique designs the J is a very forgiving yet robust and.

There is an advantage when vertically combining 12 radiating sections to have a bit of separation between the half-wave end points. Many old-timers call the J-Pole an end-fed Zep as it is similar in design to the end-fed antennas of the 1930s. In this paper a super J-pole antenna with two modified fractal Koch curve shaped elements is proposed.

Using what is called Plumbers Delight construction I soldered all joints using a propane torch lead-freenon acid core solder and some soldering flux. Up to 24 cash back J-pole antenna design pdf templates Before we start be prepared to experiment. Tuning can be done by adjusting the 14 wave stub length and the feedpoint position.

Simple J-Type 10m Vertical by W6IOJ Sept. Many like to compare the. The J Pole antenna is a popular antenna design among amateur radio operators because it is effective and easy to build.

From the antenna so as not to affect the result Sweep the antenna from 144 MHz to 148MHz the SWR should be under 151 across the whole range For small adjustments tap the bracket up and down on the EMT with a screwdriver handle If the SWR is high open the range to 120 MHz to 160 MHz and see where the dip is. A balun is necessary because a J-pole antenna uses a balanced feed the 14-wavelength matching section connected to an unbalanced feed line the coax. For the bottom J section The coil forms are 38 fiberglass rods.

FIX ANTENNA TO MAST 2 INCH HOSE CLAMPY U BOLTS MAY CRIMP COPPER PIPE HOSE CLAMPS SECURE WELL IN MY NOTE. The J Pole antenna is a simplified version of the Slim Jim antenna using the same matching stub principle. Invented by the Germans as Balloon Antennas and originally.

I found them at a local farm store. 9 Simple J Pole Antenna Projects. An inefficient antenna produces a small-amplitude EM wave for the same feed power and converts most of the power into heat.

This antenna design does not need a ground plane and is ideal for mounting inside PVC piping to protect it from the elements. 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. 2 METER J-POLE ANTENNA This is perhaps the cheapest gain antenna for 2 meters that can be built.

Make the jout of 14 soft copper Solder it in place thru the hole and add the cable. The Breakaway 2- meter J-Pole 25 is a two-piece design that will fold to fit in the trunk of a car the 6-meter J-Pole 45 measures 135 feet and is also a two-piece design. Because of its J-pole design it requires no metal ground plane.

This is important because if the mast extends above the antenna ground plane it will affect the performance of the antenna. The 222-MHz J-PoIe 18 is 29 inches long. The simplest way to make a balun is to get a split-core cylindrical ferrite such as an Amidon 2X-43-251 and attach it to the outside of the coax 14 wavelength.

Total cost for this antenna is under 10 excluding coax and it can be built in about an hour. Convert a J Pole to a Slim Jim More Antenna Projects. This picture shows that the base of the antenna is mounted flush to the top of the mast.

The calculator will get you close or spot on if youre lucky but there are so many variables. Cost about 6 using new parts. In order to increase the bandwidth and to.

The radiating element of this antenna must be clear of nearby metal objects by at least inchey If side mounted on an use 6 foot side mount Top of antenna may requÑe. You can use an antenna analyser to easily find if you are too long or short. However if mounted outside then an earth ground to the conduit is recommended.

This antenna does not need a ground to operate correctly. Ulated supp ott at high wind ice elevationy 12 INCH COPPER. Commercial collinear base antennas multiple ⅝ wave elements means more gain lower takeoff angle.

The Tri-band J-pole by KB6EPO III. Most notably the antennas used on the Zeppelin dirigibles. Adjust tap point up down to find a match point.

Average gain with a 2 meter J-Pole is about 3 db. Special requests are. The length of the antenna is three quarter wavelength.

Allowing one additional flexibility in location. It radiates and receives in an omni-directional pattern. Get 08 dB more gain out of the trusty Super-J by replacing the traditional phasing stub with a long coil.

It can be constructed from inexpensive materials at. The J-Pole antenna can be best described as a ½ wave vertical with a ¼ wave matching stub. Kinsner The design and implementation of a 2m J-pole antenna Technical Report DEL-92-1 November 1992 40 pp S 255fMHz 1-1316 F 272fMHz 1-78 RQ.

Antenna Projects

Mast Mountable J Pole Antenna