J Pole Design

Kinsner VE4WK 1 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 Q 2807fMHz 19-316 W. 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.

Various Phase Stubs For Collinear J Pole Antenna Ham Radio Antenna Antennas

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.

J pole design. DESIGN YOUR OWN J POLE FOR ANY BAND. A ¾ wavelength radiator and a ¼ wavelength matching stub. Bessel Lowpass Filter 24 dBoctave.

Shield attaches to the short section feed point. I mean its a cool design and all but some people swear by them. Microstrip Patch Antenna Calculator.

Daves J-Pole Antenna Calculator. This Open-Stub J-Pole design is similar to many plans and commercially produced units however Ive made some slight modifications on mine that give better performance for UHF. Coax center conductor attaches to the Long section feed point.

The top of the metal pole should not. Mount the antenna in the location of your choice using the lower 5 ft. This will provide some protection in the event of a lightning strike.

Collinear Design A calculator for deriving the lengths of tubing to be used for the construction of a Super J-Pole Antenna. 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. Logarithmic Periodic Dipole Antenna Calculator.

It is a vertically polarized antenna with two elements. This calculator can be used to design a Slim Jim or a J Pole antenna. Figure 2 shows a diagram of a shorted-stub J-Pole with the significant design dimensions.

The length of the antenna is three quarter wavelength. K is the fractional decrease of the antenna compared to the electrical length. Its basically an end-fed omnidirectional half-wave antenna matched to the feedline by a quarter wave transmission line stub.

Joe and I share some insight on why the J-Pole is such a popular antenna for VHFUHF operation. Hans Beggerow was used aboard Zeppelin airships since the early 1900s. Yagi Uda Antenna Designer NBS Tech.

What advantages do they have. The ¼ wave stub cancels out ¼ wavelength of the ¾ wavelength. You should get good results with the choke within 3 or 4 inches of the feedpoint on.

Have your J-Pole and ground it too. For 2 meters the coil is 4 turns of coax at 5 inches in diameter. Design your J Pole for HF 2 meters 220 440 and up.

Resources listed under J Pole category belongs to Antennas main collection and get reviewed and rated by amateur radio operators. The J-Pole is an older antenna design thats been around a while but not widely used or thought of these days. The original idea came from the Arrow Antenna open stub J-Pole which is made and sold by Allen Lowe NoIMW for 39.

J Pole Calculator and drawing by K4ABT G. September 24 2018 February 27 2015. Note 688 Yagi Uda Antenna Designer RothammelDL6WU Filter Designer Audio AF Lowpass Filters.

J-POLE is a small software application whose purpose is to help you design J-Pole antennas using a set of straightforward actions. The J Pole antenna is a popular antenna design among amateur radio operators because it is effective and easy to build. 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.

Using the 2 or 3 stainless-steel hose clamps line up the top surface of the bracket assembly with the ink line you previously marked and tighten the clamps. The J-Pole antenna more properly called J antenna takes its name from the similar appearance to the letter J. The J-Pole antennas long and storied design history is due for one more chapter to mitigate the longstanding mast current and reliability issues.

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. V1 12 November 1992 r2 J-POLE ANTENNA FOR 2m W. J-Pole Antenna Design SAVE TIME BY USING THE CALCULATOR BELOW.

The design is based on an article which originally appeared in CQ magazine 1987 and a version of this design is produced by Arrow Antennas of the USA not. Categories Antennas Tags inductance J-Pole Simulation stub UHF VHF. September 14 2021 in.

J-Pole antenna variations Source. KF4EOKS 2 meter super j-pole antenna build SUPER J-POLE FOR 435MHz by VK6YSF The World Wide Web Prepared By Paul Howarth VK2GX Email. Scarc vhfuhf j pole antenna This antenna provides continuous coverage of the 2 metre 144 148MHz and 70cm 430 450MHz bands and is an excellent choice for base station use.

Buck Rogers Sr Practical Antenna Handbook by Joseph J. It radiates and receives in an omni-directional pattern. Carr Design by G.

Dual-Band UHFVHF optional mounting holes shown Portable Version. The antenna is a dual J pole design and has a common driven element for both bands. It operates as an end-fed half-wave antenna.

If you predominately used the upper side of the 2 meter band you might put 14700 mhz. 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. On one end of the ¾ EMT pole measure down 565 and mark a line with an ink marker.

This antenna design does not need a ground plane and is ideal for mounting inside PVC piping to protect it from the elements. 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. It is often produced or home made in configurations different from the original pure model due to mechanical-constructive advantages which however present significant.

The J Pole antenna is a simplified version of the Slim Jim antenna using the same matching stub principle. Patented in 1909 by dr. Enter your desired frequency and get the calculated lengths from below.

H R 1499 f MHz k in metres. 3-piece VHF Resonator element Total length 215 assembles without tools in just a few seconds. Where k is related to the antenna diameter in degrees and can be found from Figure 3.

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