By tech 833 have you ever wondered what was inside the antron 99 antenna. A simple ground plane antenna you can buildfor 146, 223 or 440 mhzin no time flat. If so, ill show you how to build a two meter quarter wave ground plane antenna. This makes it ideal for use on fiberglass rvs and boat walls and on top of most any roof. Four bands vertical antenna 10, 15, 20, 40 meter instruction manual general description theory of operation the hygain 14avqwbs is an omnidirectional, selfsupporting, vertical radiator that operates in the 10, 15, 20, and 40 meter amateur bands. This antenna is perfect for those hams living in the primary coverage area of the repeater for 2 meter use. Assemble antenna into support pipe with open threaded hole turned so that it will align with hole on support pipe for locking screw. Tram 1460 uhf to uhf so 239 land mobile base ground plane kit this kit will convert your uhf mobile antenna into an omni base station. The na4it cheap dual band ground plane antenna here is a neat little antenna that is very easy and cheap to build. Lengths for a, b, c and d are the total distances measured from the center of the so239 connecto r. Connect your 50q coax cablewt pl259 connector to feeding section so 239, and waterproof it with the selffusing tape etc. Guarantee no hassle refund if you are not completely satisfied with. So here is the model for the k8ch antenna, modified and scaled for 20m. Here is the list of parts needed to build your own quarter.
Volume 2 pulselarsen antennas pulselarsen antennas. Note that the better ground conditions give a lower angle. Lengths for a, b, c and d are the total distances measured from the center of the so 239 connecto r. I recently built a quarter wave ground plane antenna, so that i could get back on the 4m 70mhz band. Align the threads on the base of your antenna with threaded so239 adapter on the. Tram 1499 cb base antenna, no ground plane, for all applications. Click the image to view construction details of the 70mhz quarter wave ground plane antenna. At only 39 long and built with fiberglass radome technology, the b100 also does not require a ground plane. If you are mounting to a truck tool box, use the standard cable to come under the cab and in through the. Yes thats likely the easiest way to describe but it is simply a quarter wave antenna with 4 ground plane radials. I followed the instructions exactly and i still use the antenna today.
It is a design that performs well and exhibits low input impedance, making it ideal for use with ham equipment without the need for special matching techniques. I used stainless steel hardware and although the ring terminal and the silver plated flange of the so 239 might accept solder well, the stainless steel does not. The so 239 coax connector bolts to the radial elements through the bottom of the radial. Can be mounted in an attic for hoa restricted areas. Radial slowly twist the wire while pulling it to keep it taught. I built one of these so 239 ground planes some time back and at some point it fell over against a concrete floor, breaking off one of the radials. This is not a problem in automobiles since this artificial ground is provided by. This type of antenna is very easy to build and i recommend all beginners to give it a try.
I could use a no ground plane antenna but they tend to be long and would have to be mounted on the side of the roll cage to clear overhead obstacles like tree branches. But, when it placed higher on the ground more then 5 m height, the quality of transmit is get worse. If you are mounting to a truck tool box, use the standard cable to. Question about mounting antennas to the side of a metal. I have made a page showing some images and construction details of this antenna which can be seen here. If the antenna does not require a ground plane, shims come with the mounts to keep the set screws from dimpling the underside edge. Once you have made the balun put it in a plastic box, add an so 239 connector for the radio connection and two sockets for the antenna and the earth. Maximum legal height provides the largest signal capture area. Antenna series designed to fit onto so239 type uhf female connector for use on.
Wave ground plane guarantee no hassle refund if you are not completely satisfied with any arrow antenna product it can be returned for a full refund less shipping and handling within 90 days of purchase date. Joined apr 20, 2016 messages 35 location orange, ca. Attach the antenna to your pole with the u bolt, spring washer, and hex bolt. Sometimes, though, you need a more efficient antenna thats just as portable as a handheld. Connection is made using a pl259 and high grade coaxial cable rg2, rg58au or mini rg8 is recommended. This is the first thing you will need to build a quarter 14.
So, do not waste time and go to make the bottle antenna. Ok so this is my first prototype build of a uhf gmrs band base repeater antenna this is a prototype build, i have plans to modify and make this antenna more go bag friendly. Not sure about the pvc pipe, i had some left over from another project. Fig 24dimensional information for the 222mhz groundplane antenna.
To do the antenna takes a half of hour and to tune the antenna also takes a half of hour. How the antenna works as a multiple of half wave lengths on the higher bands. These are used mainly for the vhf and uhf frequency bands. Pg1ns ham radio site 2m projects omnidirectional antennas. If the antenna does not require a ground plane, shims come with the mounts to keep the set screws from dim. While its true that a mobile antenna mounted in the center of the roof or trunk.
The workman b100 is a highperformance, wellconstructed cb antenna that can be used virtually anywhere. As a reference, my old 58wave ground plane antenna had 3dbi gain. Phw portable 12 wave for emergency use with portables. Typically, the so 239 uhf femaleuhf jack is installed on the radio, and the pl259 uhf maleuhf plug is installed on the cable. They are very easy to build and will perform better than the antennas that come with most handhelds. You can solder the radiating element directly to the connector and use the. Connection is made using a pl259 and high grade coaxial cable. Hf type mount antenna count on larsen uhf antennas to deliver these superior performance advantages. A portable multiband endfed half wave efhw antenna for 4010m. So239 mounting bracket ground plane radials figure 1. Buy tram 1499 cb base antenna, no ground plane, for all applications with fast shipping and toprated customer service. Heavy duty soldering gun wire cutters vise or third hand or another human.
The vertical radiator a should be soldered to the center connector of the so239. Sirio gpa 2745 mhz ground plane base antenna 3000 watts, 2. Comet original gp3 dual band 146446 mhz heavyduty fiberglass vertical base antenna 5 11, so 239 connector. Uhf 14 wave ground plane base antenna available for 420450 mhz amateur radio band 450470 mhz gmrs and business bands lifetime warranty click here for warranty details all stainlessa. So 239 feed connector covers 152 162 mhz with a vswr of less than 1. Makes a gain, ground plane antenna when used with larsen models. The quarterwavelength, ground plane antenna is made up of one vertical element, called the driven element, and four radials. There are usually four radials, three being a minimum, but you could use up to six. Can be used asis for receiving or trimmed to broadcast on a specific frequency built just like our popular scanner antennas. Tram 1465 nmo to uhf so 239 land mobile base ground plane kit this kit will convert your nmo mobile antenna into an omni base station. The shorter dual band antennas require a ground plane. This antenna is nothing more than the old standby droopy groundplane.
I am constructing a simple 2 m 14 wave groundplane which is made of 5 brass rods, one center vertical 19. Question about mounting antennas to the side of a metal mast. The j antenna goes back many years, long before i became a ham. Kg patented lowimpedance design in a, hole mount om self mounting, no ground plane antenna po dc ground, so 239 l. Groundplane antennas for 144, 222 and 440 mhz arrl. It is often the first antenna they buy or build for use on 2 meters after receiving their technician license.
The vertical radiator is now firmly soldered to the center pin and reinforced by the brass insert surrounding it. Four ground plane radials bolt to the horizontal member at the left of the mast mounting cap. Ground plane antennas ground plane antennas is the topic of the new december episode of the arrl the doctor is in podcast. The gpk01 mounts to a 2 pole or stake with the included hardware. It features wireend loops for safety sharp, straight wires are hazardous and convenience its. Instead use 440 bolts home depot and the 440 nuts to fit them. Before applying rf to the antenna, connect an swr meter to the so239 connec. The one pictured below is for receiving adsb aircraft signals on 1090mhz, again using scrap copper, but this time a purchased ntype chassis socket.
The elements are made from 38 solid aluminum with a heavy duty angle mounting bracket. Fig 24 dimensional information for the 222mhz groundplane antenna. Thank you for purchasing the comet cha250b broadband gp antenna. Taperswaged tubing reduces the wind load and increases its mechanical durability. Workman b100 saturn base cb antenna for base, boat or truck. Arrow gp52 6 meter sold as is, no refunds or returns.
Here we have a ground plane antenna mostly used for 144, 222, 440 mhz. Designed to work on vehicles without a substantial metal chassis or ground plane. It is an omnidirectional antenna that is very easy to build with minimum equipment. Electrical types include 14 wave, 12 wave, 58 wave, uhf mobiles are available in the f o llowing sty les. Resoldering turned out to be a pain, so the next version that i built, used 14 inch copper tubing for the radials. I am not going to go into the details on how to built it, because its so simple. Its is important to install the hardware operates in the 144148 mhz range. Generally, antennas for vhf bands are mounted as high off the ground as practical to overcome the limitations of the so called lineof sight transmission and reception. A standard so 239 type antenna connector is located on the rear panel of the 257. All of the commercial antenna options cost more than antennas you can build yourself for just a few dollarsplus a bit of your time. The gain for the ground plane is very nearly constant and equal to an isotropic antenna at low heights and real ground conditions. One of the simplest antennas you can build is a quaterwave ground plane antenna. Amateur quarter wave ground plane antenna maxisantilli. Do you want to transmit a stronger signal to the repeaters.
I would probably just get a 4 hole panel mount so 239 connector and some brazing rod or stiff solid copper wire and make a 14 wave or 58 wave 2m ground plane antenna instead and bolt it to the top of the pvc. Simplifies groundp lane antenna construction w6nbc. Meanwhie the takeoff angle appears to be in the range of 15 to 20 degrees for most cases at low heights. Replacing the antron 99 with a new 58wave ground plane antenna will result in a 1. Dont touch a coaxial cable and so on because it is sometimes struck by electricity. An artificial ground must then be used since the antenna is well above the ground in this case. Be prepared and able to communicate in case of emergency with the largest selection at.
Ground plane antenna thank you for purchasing our products. Therefore, i used lock washers to reduce the loosening of the connections to the flange. A standard so 239 type connector is provided on the rear panel of the transceiver. I then placed the so 239 in a vice with the center pin upwards and placing the brass insert over the pin i heated the insert with the torch until the element and insert slid smoothly into place over the center pin. It works fine with low swr, but nearly all the repeaters i want to reach are northish of me and i dont just dont have enough umph to make it into the further ones. Since 2000, members of our club experiment and work with the limpy arnold antenna. Nagoya gpk01 21 radials nmo mount ground plane kit for base or field use, so 239 connector, mounts to 2 pole, mast, pipe. The 5way 34 pvc cross connector that i used for the. Most hams are familiar with the quarter wavelength ground plane antenna design. Our antenna is now complete except for a way to mount it. The ease of construction and low cost of a ground plane antenna makes it an ideal choice for vhf operators. I dont recommend soldering the ground plane radials. The antennas require a ground plane and feature a large mounting foot with an so239 connector.
The basic j is reported to have 3db of gain over a. Heavy duty aluminum and stainless steel with an so 239 connection. Simple ground plane antennas n1gythe simple approach to. It is ideal for technician class hams needing a first antenna, and also a very good emergency antenna for use during skywarn events when you dont want to be on the sky hooks tall in the sky. Radial attach each radial with a 632 screw, lockwasher and nut 20. A fun project to build and learn how to tune antennas is a. Ground plane 14 wave vertical the ground plane or 14 wave vertical will give a good amount of gain over a rubber duck type antenna. Homebrew vhfuhf ground plane antenna not to scale 20. The mfj1401 mobile to base station ground plane kit converts most mobile.
Below is a quarter wave ground plane antenna i made for 23cm, 1296mhz which is made from offcuts of household mains copper wire and a scrap bnc socket from the junk box. Fig 24dimensional information for the 222mhz ground plane antenna. Apr 09, 2014 is your ham radio ht rubber ducky letting you down. Pl pl259 coax fitting complete with ug175 adapter where appropriate. I used a chassis mount so 239 female uhf connector as i have a length of lmr195 with an n on one end and a pl259 male uhf on the other that was just the right length. The only part you will need to buy is an so 239 panel mount connector. All have a soft rubber pad to protect the vehicle paint. Cb radio antennas for base station radio for sale in. Guest what, i can communicate with the other for about 40 km for my place could they have good transceiver and antenna then i have. The antenna should be rated at 50 watts pep minimum. About this odd namegiving, pa7zee wrote in electron of nov 2003. Trying to make 14 wave 2m ground plane directional qrz forums. Your antenna usually works like my 2m half wave ground plane.
Page 1 gpg1b 14 wave ground plane antenna 144148 mhz 308 industrial park road, starkville, ms 39759 usa ph. Unfollow ground plane antenna to stop getting updates on your ebay feed. Place the so 239 into position and measure the rod then cut the rod accordingly. Make offer cb radio antenna times microwave lmr400 coax cable pl259 so 239 25ft. The gpk01 provides a proper ground plane for easy field or base antenna deployments. For this weeks project, we will be building a 14 wave ground plane antenna.
It is a design that performs well and exhibits low input. The system will work against earth ground or a resonant radial system when mounted above ground. This particular ground plane is constructed out of an so239 chassis connector, so the radiator is attached to the center conductor of the. May 07, 2010 here we have a ground plane antenna mostly used for 144, 222, 440 mhz. The two mate and are collectively known as a uhf connection.
This is a nontunable antenna and must be trimmed for broadcasting. Most hams are familiar with the quarter wavelength groundplane antenna design. If you are just getting experience in building antennas or you are an old pro, here is a simple and fun project. To use the antenna connect the spool of wire to the matching unit by soldering a plug on the end. Connect the antenna the transceiver will operate using any standard 50ohm ground plane, vertical, mobile whip, long wire or similar antenna. An easy way to make this antenna is to use an so 239 coax connector. You can pick one up at radio shack or your favorite electronic supply. Practical antenna design 140150 mhz vhf transceivers third. New hams can build this with little to no experience in antenna building. You might want to get a couple of them just in case you damage it on the first try. Tram 1499 cb base antenna, no ground plane, for all. The cylindrical cap at the right is sized to slip over the end of a 3. This calculator can be used to design a quarter wave ground plane antenna, with radials.