How to improve your frs radio communications range. Getting the most from your personal radio, murs or frsgmrs. I am looking for plans to build a home brew yagi 4 or 5 elements for the gmrs center freq. Ive currently got a 2m70cm dualband model in the attic as a backup antenna. Authentic n9tax vhfuhf slim jim jpole dual band mursgmrs. Yagi calculator download it performs the calculations needed to. Therefore, we continue to deliver power and innovative solutions with extreme range devices like our mxt, gxt, and xt series. These radios have a maximum long distance in optimal conditions which means they only work at that distance is there are zero obstructions i. Urban 5, suburban 6, mobile 9, theme park 7use stock antenna, camping 9, rural 6 under construction.
Although the frs channels 8 14 are essentially identical with both services, the frs channels 1 7 are restricted to 2 watts whereas the same gmrs channels allow 5 watts, and the channels 15 22 can go up to 50 watts with gmrs service but only 2 watts with frs. Online calculator hb9cv antenna calculator changpuak. This final calculator can be useful if you are using a. Part of our mission is to provide you with the reliable communication tools you need to go further off the beaten path. Spacing is the distance from the boom to the gammamatch. Everything you need to know about gmrsfrs, but were afraid. Uhf 2 and 3 element beam antennas 420470 mhz 70cm, gmrs and uhf business band. The antenna is designed to be fed with 50 or 75 ohm coax cable of most any length with a balun. It is inversely proportional to the frequency which means the wave with higher frequency will have shorter wavelength. This link is listed in our web site directory since monday may 16 2005, and till today gmrs jpole antenna has been followed for a total of 9167 times. The type of radio signal is a significant variable in determining range. Considering connector and cable loss lets say 4dbi using 50ft rg2 w 3 so259 ends and a barrel connector still yields gain of around 3.
This wlan range calculator takes frequency,transmit power,receiver sensitivity,antenna gains,fade margin as inputs and provides coverage range as output. Even on the shared interstitial frequencies, gmrs radios can use raised antennas that will increase the range of. Unfollow gmrs antenna to stop getting updates on your ebay feed. A very basic program for calculating the length of each leg of a 12 wave wire dipole antenna. Here is a simple antenna calculator for two popular forms of ham radio hf wire antennas. It is quite possible, that other calculators deliver slightly different results. Feeding the antenna can be done at the director or at the reflector. The coax jumpers made the other 2 unactive elements. This app does nothing more than the standard 468freq mhz type calculations. Jun 23, 2015 an expedient which improves performance of a flexible antenna is a counterpoise 18. As you can sort of see from this table there are several differences between the gmrs and frs services.
Details about authentic n9tax vhfuhf slim jim jpole dual band mursgmrs antenna jpole. Gmrs station antennas must meet the requirements in 95. I hooked up the antenna to a transceiver and swr meter and got a 1. Authentic n9tax vhfuhf slim jim jpole dual band murs. On vehicles, mount your antenna as high as possible in a vertical position. Effective jan 2016 i will be changing web hosting providers and as such a complete redesign of my website using a content management systemcms to better design and host the site. Wine, to produce dimensions for a dl6wu style long yagi antenna. Long range twoway radios are exactly what they sound like and simultaneously not. Ive taken what i learned from the gmrs continue reading homebrew 5 element vhf yagi. The antenna can be mounted to any kind of mast since the bottom portion part sticking down from the u is at ground potential anyway.
Extends the range of your ham or gmrs handheld radio. Dipole antenna length calculator dipoles antennas are easy to build and can be very effective when placed half a wavelenth or more above ground. The formula for this wifi range calculator is also mentioned. J pole antenna calculator free online math calculator. Calculator allows to calculate length and other basic parameters of the various constructions of the dipole antennas taking into account dependence this. Going the distance with 5 watt walkie talkie radios. It gives you the appproximate length of, for instance, 75. This calculator can be used to design a quarter wave ground plane antenna, with radials. The slim jim, designed by the late fred judd, g2bcx, can be a great portable roll up antenna, if made out of 300.
If you have no particular preference within a given ham radio band, then simply enter its center frequency i. Authentic n9tax vhfuhf slim jim jpole dual band mursgmrs antenna jpole. Also the entire uhf, murs, frsgmrs bands, it receives weather and even has an fm broadcast receive. Increase your vhfuhf performance with this lightweight, highperformance base station antenna kit. The formula for calculating the approximate length of a quarterwave vertical antenna is. Enter the formula for the antenna calculation normally 468f. There are usually four radials, three being a minimum, but you could use up to six. Design and adjustement is easy, as with the capacitor you can tune the resonance by some mhz with no effort. The distance between one point to another adjacent point in a wave is known as the wavelength. Antenna log periodic design log periodic antenna design excel sheet file download, in italian. Buy midland mxt100 40mile micromobiletm fixedmount gmrs 2way radio with magnetic mount antenna consumer electronics.
About gmrs jpole antenna the resource is currently listed in in a single category. The cable is 6 meters but the distance from radio to antenna is 1. See more ideas about ham radio antenna and ham radio. The gmrs operates on uhf frequencies around 460 mhz, so our range estimations.
For 2 meters, the coil is 4 turns of coax at 5 inches in diameter. Dipoles antennas are easy to build and can be very effective when placed half a wavelenth or more above ground. How to improve your frs radio communications range including. Perfect for portable or permanent base stations and backpacking trips. Yagi calculator is a windows program that also runs well on linux, ubuntu.
Forum general gmrs radio antenna sc4 amateur radio club. The new 2017 frs and gmrs radio frequencies code green. Portable rollup jpole antenna deployment and usage tips. Higher frequencies in the uhf band do not travel as far but can pass around obstacles more easily. This puppy will give you roughly 10 db of gain over an ht, stock antenna or the equivalent of boosting your transmit power about 10 fold. Antenna calculator and design software electroschematics. Due to material, i decided on a 5 element yagi built for vhf since all i would have to buy is more 38.
The formula for calculating the approximate length of a dipole is. A matching device must be added between the antenna and the feedline if you wish to use coaxial. Communication distance can be somewhat improved 25%to 50% further over. Antenna, ve3sqb ham radio antenna design software programs. Antenna calculator antenna calculator is a useful tool when developing antennas for amateur radio purposes if you cannot remember the maths to calculate. Its white fiberglass, about 7 feet tall and youll definitely be the envy of the gmrs set. It has variable power, three different power levels all the way up to eight watts. This antenna project will allow you to design a collinear antenna for either the 2 meter or the 70cm 440 ham band that will give you lots of gain using the calculator in the download. Its a light magnetic loop antenna calculator that run on ms windows, and allow to calculate capacitor values and voltage based on loop circumference, conductor diameter, desired resonant frequency and the operating power. Vhfuhf line of sight distance calculator this one will be a bit more accurate, as it allows you to put in the antenna height of both stations you and the other guy. Antenna pattern is omni directional very high gain and low to horizon radiation angle. Uhf 2 and 3 element directional beam antennas centerfire. If anyone could direct me in the direction of a web site or plans i would greatly appreciate it.
Everything else free delivery possible on eligible purchases. Reinforce the soldered connection with heat shrink to resist flexing. Marine 155 159 mhz landmobile and scanner jpole antenna. About cantenna calculator the resource is currently listed in in 2 categories. J pole antenna calculator free online math calculator and. The general mobile radio service or gmrs for short has evolved since its original establishment in quite different form in the 1960s. Some are based on lookup tables, some completely hide their algorithms. The new 2017 frs and gmrs radio frequencies code green prep. Now its time to step it up just a little bit and fabricate a bigger antenna.
The main category is j pole antenna plans that is about building jpole amateur radio antennas. Midland mxt100 40mile micromobiletm fixedmount gmrs 2way. Download hf dipole calculator 12 wave wire dipole antenna. This calculator will help you to calculate the different wavelength of antennas based on the frequency.
This page covers wlan range calculator or wifi range calculator. The other antenna was made by antenna specialist who are still in business and may still produce the super scanner. Wb3ayw and kk1cw vhfuhf collinear j pole with short spaced. Adding a coil in series with the antenna at the base is one way of doing this. In 1987 it evolved to essentially its present form, with business use specifically excluded, with a set of eight channel pairs for repeater operation, and seven single channels for nonrepeater simplex operation. Works either in standard and metric units, and let you choose on material, and loop shape, as circular, square or octagon.
Ive been producing these antennas professionally for nearly a decade now and have sold over 15000 units. For example, a repeater antenna at 100 feet would give an approximate line of sight distance of 12. The measurements below are for building a simple dipole antenna. Miklor radio information site miklor outdoors hunting camping shtf gmrs radio communications antenna battery electronics scanners digital computer software hardware laptop ipad iphone ebay music radio. Wb3ayw and kk1cw vhfuhf collinear j pole with short. Antenna modeling used to be the domain of scientists and engineers with very expensive. Frsonly channels are 8 14, gmrs channels are 15 22 exclusively, and channels 1 7 are both frs and gmrs. Yagi calculator is a program to assist with the design of long yagi antennas. I am a ham operator and soon plan to get my gmrs license. A quarterwavelength antenna is easy and inexpensive to build and can be an effective antenna with a low angle of radiation that is, power is radiated out, not up.
The above graph shows the distance range between a pedestrian with a whip antenna and a mobile vehicle with a basic vehicle whip antenna. Midland mxt100 40mile micromobiletm fixedmount gmrs. This link is listed in our web site directory since wednesday sep 19 2012, and till today cantenna calculator has been followed for a total of 4087 t. Calculate the dimensions for a slim jim or j pole antenna for hf, vhf or uhf including velocity factor. Hf dipole antenna this antenna software will help you design a simple wire dipole antennas for 1 30 mhz. This calculator can be used to design a slim jim or a j pole antenna. Lower frequencies such as those on the vhf band travel farther but can be more easily blocked. Dl6wu style yagis for vhfuhf updated 7 october 2019. Enter the desired operating frequency in megahertz to get a good starting length for a dipole in both feet and meters. Each antenna is tuned to focus on the 462467 mhz uhf and 151154 mhz vhf public bands, with match for transmit at approximately the center of those ranges.
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. This link is listed in our web site directory since wednesday sep 19 2012, and till today cantenna calculator has been followed for a total of 4087 times. This antenna beams into three quadrants without the use of a rotator. By using relays, a single feed line could be switched to 1 of 3 elements or to all for an omni position.
Online physics calculator that calculates the long, short section, feed point, spacing dimensions values for current frequency. Hf backpack radios, hf packs, cb backpack radios, or manpack radios are compared with handy talkies, walkie talkie, or ht radios. Works either in standard and metric units, and let you choose on material, and loopread more. This calculator will help you to calculate the different wavelength of.
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