The c pole a ground independent vertical antenna brian v. Invented by the germans for use on their zeppelins, this antenna is also referred to as a zepp antenna. Packet radio operators complete guide to building amateur radio j pole antennae jpole antenna design calculator building a 2meter jpole antenna. Please practice handwashing and social distancing, and check out our resources for adapting to these times.
It is used to design j pole antennas for the desired frequency. Antenna, ve3sqb ham radio antenna design software programs. Slim jim and j pole calculator american version m0ukd. Jpole is a free and portable antenna design software for windows. This will cover the washers and make the antenna virtually waterproof. The correct method of attaching the coax is the live to the stub except for some super designs which are really dipoles next to the radiator. Total length of antenna in feet open the dipole length calculator in a separate page. About c pole antenna calculator the resource is currently listed in in a single category.
This link is listed in our web site directory since wednesday jul 16 2008, and till today c pole antenna calculator has been followed for a total of 2821 times. The c pole a ground independent vertical antenna qst april 2004, pp. Matching to the feedline is achieved by sliding the connection of the feedline back and forth along the stub until an impedance match is obtained. Antenna design calculators jeroen steeman software. To use the following calculator, enter your desired operating frequency in the target frequency box and click the calculate lengths button. A groundcoupled portable antenna qst january 2001, pp. May, 2014 j pole calculator just enter the frequency and get the measurements you need. This calculator on the whip antenna mentions formula or equations used for calculations. Collinear antenna phasing coil calculator and construction.
An omnidirectional endfed halfwave antenna with a quarterwave transmission line matching stub. Matching to the feedline is achieved by sliding the connection of the feedline back and forth along the stub until a vswr as close as possible to 1. Selfsupporting antenna towers, or telescopic unguyed towers, have become more desirable in recent years due to the need for rapid deployment, urban incidents, and quicker mobility, especially when guy wire installations are not feasible. Whip antenna calculator monopole antenna calculator. The jpole antenna is an endfed omnidirectional halfwave antenna that is matched to the feedline by a quarter wave transmission line stub. The j pole antenna is a quick and easy plumbers delight. This calculator is designed to give the vertical length height of a particular antenna, for the frequency and wavelength chosen.
Online calculator jpole antenna designer changpuak. Enter the desired operating frequency in megahertz to get a good starting length for a dipole in both feet and meters. How to make a dipole fm transmitter antenna page 3 17. It also determines the wavelength and the length adjustment factor k. This formula to obtain the length of a halfwave dipole antenna will give a good ballpark value to start with. Dipole antenna calculator electrical, rf and electronics. Enter the required frequency in mhz and the antenna designer will calculate the dimensions of. Cpole portable antenna for 20mt antennas i1wqrlinkradio.
About c pole antenna the resource is currently listed in in a single category. Antenna calcpack is the latest offering from mogpie. This whip antenna calculator calculates various parameters of whip antenna or monopole antenna. The antenna can be ground mounted or attached to an insulated pole, which will further improve the hf performance as shown later. The antenna consists of a vertical halfwave dipole that has been folded virtuthe c pole a ground independent vertical antenna kf2yn takes the vertical to new heights with this folded design that doesnt require a counterpoise. The antenna calculator above uses this formula as a starting point to calculate wire lengths for the dipole. Kingston amateur radio club home brew projects antennae. The super jpole antenna for 430 450mhz was constructed and used for fm simplex and repeater operation at my previous residence in melbourne, victoria from 2002 2007 the super j pole antenna is a colinear vertical consisting of a number of half wave length vertical elements separated with halfwave length stubs tuning stub feed with a. Then use the resulting calculated lengths with the corresponding lettered segments on the diagram to cut your antenna to the right length. It is a folded halfwave dipole with an asymmetrical tapped 50ohmpoint in the lower part of the antenna. Antenna design freeware 1d and 2d arrays from mei software.
The load impedance can also be calculated from the measured impedance at the line input. Enter the desired frequency and select the desired calculation from the drop box. Amateur radio rf safety calculator antena solverby dr. Distance from center of antenna to the center of the coil in feet must be less than half the total antenna length given above. Jpole antenna is pretty easy to build and usually designed by amateur radio operators through this software, you can easily find out four important parameters to build this antenna namely, radiator length, driven stud length, gap space, and feedpoint. This dipole antenna calculator determines the size of a simple dipole antenna for a given frequency and the dipole wire diameter. I have modified the c pole for a greater bandwidth. This free online tool takes antenna height and the topographical formations of the earth to calculate the lineofsight of a radio path. If you have no particular preference within a given ham radio band, then simply enter its center frequency i. This calculator is designed to give the horizontal length of a particular dipole including tees antenna, or one side of it, for the frequency chosen. It is used to design jpole antennas for the desired frequency.
The jpole antenna is a quick and easy plumbers delight. The universal band and block pim calculator allows you to first select a regional tab and then select various combinations of transmit downlink frequency bandsblocks to determine whether there are any theoretical possibilities of 2nd, 3rd, 4th or 5th order passive intermodulation pim products or hits being produced in the companion uplink receive frequency bandsblocks. Review of the commradio cr1 software defined radio radios, ham radio license. On my website i offer both jpole and slim jim antennas in vhf and uhf configurations. Dipole antenna length calculator dipoles antennas are easy to build and can be very effective when placed half a wavelenth or more above ground. David fluckiger, kj5at antenna design and software from g4fgq. Kf2yn takes the vertical to new heights with this folded design that doesnt. This link is listed in our web site directory since wednesday jul 16 2008, and till today cpole antenna calculator has been followed for a total of 2821 times. Visit to see construction details for this antenna. In 1936 this design was modified into the current configuration used today and became popular with amateur radio. Some swear by it but i am sorry, i have never heard one that worked that well. The jpole antenna is an endfed omnidirectional halfwave antenna that is matched to the feedline by a quarter wave parallel transmission line stub of lecher system form. Msdos antenna maker it allows to quickly calculate dimensions for quads antennas, yagi antenna, inverted vees antennas as well as jpoles and traps to. Hb9mtn cpole portable antenna for 20m radios, radio amateur, hf radio.
Ive finished yet one more version of my crappie pole antenna, this one based on kf2yns ground independent vertical antenna or cpole. The antenna is designed to be fed with 50 or 75 ohm coax cable of most any length with a balun. J pole antenna is pretty easy to build and usually designed by amateur radio operators through this software, you can easily find out four important parameters to build this antenna namely, radiator length, driven stud length, gap space, and feedpoint. The hb9mtn web site shows an antenna that is designed for use. The results are conveniently displayed in inches, centimeters, feet and meters. Satsat, by fabrice aneche is a satellite tracking software, for radio amateurs, scientists or hobbyi. See more ideas about ham radio antenna and ham radio. This is a collection of valuable antenna design calculators including quad design for a quad beam, antcalc for common antenna types, inductor calculator and a r esonance calculator for calculating the resonance of a tuned lc circuit or trap. I already have one self supporting 20 mtr cpole antenna. Shoppers sometimes have a hard time making a decision on which will be best for their needs and will ask which is better for them. The main category is antenna design calculators that is about antenna design calculators. The te11 cutoff frequency should be lower than 2412 mhz and the tm01 cutoff should be higher than 2462 mhz. This link is listed in our web site directory since wednesday jul 16 2008, and till today c pole antenna has been followed for a total of 3908 times. J pole is a free and portable antenna design software for windows.
J pole antenna dimension calculator back to antenna calculator overview. The measurements below are for building a simple dipole antenna. With this increased demand for aluminum telescoping masts without guy wires, aluma tower company, inc. The main category is 14 mhz meters ham radio antennas that is about 20 meters band antennas. Note that antennas are very rarely constructed according to the calculated theoretical dimensions and are always tuned to the lowest standing wave ratio swr and the highest electric field strength. Frequency mhz velocity factor see text vf actual wavelength inches wavelength considering velocity factor inches a. Having had a gem quad hf 201510m for a few years, back in the early 80s, i can testify to the quads slight advantages over a tribander yagi with the same number of elements my experience has been that a well designed, 3element triband quad has. The simulation results show gain of our propose antenna design simulation on the l1 frequency, that is. For 2 meters, the coil is 4 turns of coax at 5 inches in diameter. With the transmission line calculator, you can select the type of line, length, operating frequency, and calculate the losses, as well as the swr and losses from swr due to impedance mismatch. Being a halfwave antenna, it provides a small gain over a. This does not take into consideration the type or size of horizontal reflectors, of even if there is a need for them.
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. The super jpole antennacollinear design below is a javascript for calculating the lengths of tubing to be used for the construction of a super jpole. Golf1 net 4q 2021 originally, the fox program c satsat for ios version 1. A little searching around essex pack identified a tree with some open space to the south. Online calculator folded dipole calculator changpuak. I merely hung one cpole in that tree and set my self supporting cpole about 44 58 wavelength on 14. J pole calculator just enter the frequency and get the. With the remaining pvc pipe, cut two lengths about 6 long and push each into an end of the 90degree pvc corner piece. One might have seen long straight rod on the car, it is known as whip antenna. They also tune up quite well in the 70cm 440mhz ham band.
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