J Pole Antenna Design

J-POLE is a small software application whose purpose is to help you design J-Pole antennas using a set of straightforward actions. Its basically an end-fed omnidirectional half-wave antenna matched to the feedline by a quarter wave transmission line stub.

Design Your Own Super J Pole Ham Radio Ham Radio Antenna Emergency Radio

J-pole Antenna Because the J-pole and Zepp are electrically identical in function and are similar to all other end-fed antennas in problems pages on J-poles Zepps and end-fed verticals overlap.

J pole antenna design. It does not require a ground plane for operation but it is firmly recommended that the antenna should be mounted on a well grounded metal pole. It radiates and receives in an omni-directional pattern. Daves J-Pole Antenna Calculator.

For 2 meters the coil is 4 turns of coax at 5 inches in diameter. A DISCUSSION OF ANTENNA THEORY by Paul Graham K9ERG J Pole Calculator and drawing by K4ABT G. The Slim Jim designed by the late Fred Judd G2BCX can be a great portable roll up antenna if made out of 300Ω or 450Ω ladder line twin feeder.

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. Patented in 1909 by dr. The J-Pole antennas long and storied design history is due for one more chapter to mitigate the longstanding mast current and reliability issues.

Stub-j-pole-project-completed-many-times Jeff had the same idea as we did. The J-pole and other end-fed Hertz antennas are prime examples of antenna that can have severe feed line common mode current problems. From the book the slim JIM was developed based on the basic J-Pole design see Fig1.

It is true feed-line circumstances often present a high impedance to common mode currents but any antenna design lacking features to prevent this 100 of the time is an incomplete design. What advantages do they have. The J Pole antenna is a simplified version of the Slim Jim antenna using the same matching stub principle.

The J-Pole antenna became so popular in the VHF band because of its simplicity in design and construction. Simple J-Type 10m Vertical by W6IOJ Sept. Joe and I share some insight on why the J-Pole is such a popular antenna for VHFUHF operation.

Collinear Design A calculator for deriving the lengths of tubing to be used for the construction of a Super J-Pole Antenna. This calculator can be used to design a Slim Jim or a J Pole antenna. 440 Super J-Pole Antenna by KA0NAN April 1996.

The J-Pole antenna can be best described as a ½ wave vertical with a ¼ wave matching stub. KF4EOKS 2 meter super j-pole antenna build SUPER J-POLE FOR 435MHz by VK6YSF The World Wide Web Prepared By Paul Howarth VK2GX. September 14 2021 in.

Add a loop of string to the top and hang it on a tree branch use it with your handheld transceiver then roll it up. The MARSians mass produced this antenna during the VHF frenzy in the mid-80s. If you predominately used the upper side of the 2 meter band you might put 14700 mhz.

For example if you wanted a general J-Pole for 2 meters you might enter the center of the 2 meter band which would be 14600 mhz. Benefits – Ground plane independent – Simplicity – Built in triplexer effect 3 feed lines – Simultaneous transmission – No Bleed over between bands – Assumed gain. The calculator can be used for designing a Super J-Pole antenna for just about any frequency or it can be used for the standard J Pole.

The results confirm the tendency of the the J antenna to seriously aggravate the antenna pattern. The antenna is a dual J pole design and has a common driven element for both bands. Enter your desired frequency and get the calculated lengths from below.

The Tri-band J-pole by KB6EPO III. I mean its a cool design and all but some people swear by them. 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.

Copper Dual-Band Super J-Pole Antenna by KA0NAN April 1993. It is often produced or home made in configurations different from the original pure model due to mechanical-constructive advantages which however present significant. Average gain with a 2 meter J-Pole is about 3 db.

Hans Beggerow was used aboard Zeppelin airships since the early 1900s. Most notably the antennas used on the Zeppelin dirigibles. 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.

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. This antenna design does not need a ground plane and is ideal for mounting inside PVC piping to protect it from the elements. J-Pole antenna variations Source.

V1 12 November 1992 r2 W. September 24 2018 February 27 2015. This will provide some protection in the event of a lightning strike.

Carr Design by G. Building J-Pole amateur radio antennas category is a curation of 94 web resources on J Pole antenna for 6 meters Construction of a J-Pole antenna for 2 meter Concealed DSS J-Pole. 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.

Resources listed under J Pole category belongs to Antennas main collection and get reviewed and rated by amateur radio operators. Have your J-Pole and ground it too. S11 of our photo-model designed for 245 GHz.

The top of the metal pole should not. Categories Antennas Tags inductance J-Pole Simulation stub UHF VHF. Notoriously the J antenna is one such design.

He decide to redraw the plans and he provided all of the needed dimensions. The J Pole antenna is a popular antenna design among amateur radio operators because it is effective and easy to build. Buck Rogers Sr Practical Antenna Handbook by Joseph J.

A capacitor of 08 pF and it would be perfectly matched to 50Ω. The length of the antenna is three quarter wavelength. If the antenna is to be placed outside do not use brass.

The J-Pole antenna more properly called J antenna takes its name from the similar appearance to the letter J.

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