For a 2 meter f 146 mhz jpole antenna, the 12 wavelength radiating section section a is equal to a 0. The ground plane antenna packed with specially made gp antenna mounting hardware. Ground plane antenna for 70 cm resource detail the. Figure 2 elevation plane pattern comparing 2 meter jpole on fundamental and on third harmonic frequency 70 cm, with the antenna mounted 8 feet above ground. Vhf ground plane antenna f11 description the f11 is a vertically polarized broadband coaxial stub antenna designed for the vhf communications band. The decision to proceed with the 58 wave ground plane antenna was largely. Antennas are field tunable within the specified frequency range. Building it to build a 146 mhz antenna, cut three 2458inch pieces from the wire you bought.
In this case a ground independent antenna should be used to give the antenna its desired radiating pattern without a metal ground plane. Before starting to build the antenna, you can stiffen up ordinary 14 gauge copper. Ground mounted antennas are often very easy and convenient to use. Feb 20, 2014 easy to build ham radio dual band 2 meter and 70 centimeter ground plane antenna. Meanwhie the takeoff angle appears to be in the range of 15 to 20 degrees for most cases at low heights. Therefore the best position to install an antenna is in the centre of a metal roof, however, this is not always possible and installation on a bull bar or mirror mount is often necessary. To get the maximum performance from your antenna, it must be installed at least 35 feet above the ground. Ag150 ground plane antenna is rugged all weather model, uses high class chrome plated brass and does not require any field tuning. The computer shows that the antenna mounted 1 foot above ground has a gain of about 1. The vertical element and radials are 332 or 116inch brass welding rod.
Helical antennas john kraus, w8jk, is the originator of the helicalbeam antenna. Since 2000, members of our club experiment and work with the limpy arnold antenna. They can be made using various materials and in varous sizes. His 1950 book, antennas2, is the classic source of information. Requiring a new 2 metre band antenna for local fm simplex and repeater communication and after evaluated a couple of the main contenders for the project i settled on the 5. The resource is currently listed in in a single category. About ground plane antenna for 70 cm the resource is currently listed in in a single category. Antenna for 70 cm 432440 mhz category is a curation of 55 web resources on, dg7ybn gtv 70 2m, 432 mhz yagi antenna, experimental patch antenna. They are constructed from high strength, corrosionresistant aluminum alloy and stainless steel.
Sirio gpa 4070 vhf antenna type ground plane for base station applications in frequency range 40mhz 70mhz tunable base antenna. Radial attach each radial with a 632 screw, lockwasher and nut 20. This link is listed in our web site directory since tuesday feb 1 2011, and till today ground plane antenna for 70 cm has been followed for a total of 2535 times. It is entirely made of noncorrosive aluminium and assembled on a strong diecast base which allows an easy and safe installation assuring very good performances. We want enough beam width so aiming is not critical. Simple homemade outdoor 868mhz antenna groundplane. Brand name sirio antenna item weight 3 pounds product dimensions 30 x 3 x 4 inches. Vhf adjustable ground plane antennas 70175 mhz gp series the gp series is a range of omnidirectional unity gain adjustable ground plane antennas ideal for local area coverage when a high gain antenna is not required or justified. Radial slowly twist the wire while pulling it to keep it taught. Vhf ground independent mopole 7085 mhz cd17 series the cd17 is a ground plane independent mopole antenna which provides excellent performance in a compromise mounting position. This handbook presents basic propagation theory, the fundamentals concerning. These omnidirectional antennas are either wide band unity or 23 dbd gain antennas. Building it to build a 146mhz antenna, cut three 2458inch pieces from the wire you bought.
Ground plane antenna for base station service working on 4070 mhz by means of the tuning diagram enclosed. You can build this groundplane design for 146, 223 or 440 mhz. At70 uhf ground plane antenna key features at70 is an uhf antenna that stabilizes signal receiving and prevents impedance interference from nearby objects because of its vertical 14 wave antenna is surround by horizontal antennas at a 45 degree, cau sing a 12 wave dipole antenna effect. Datasheet pdf wifiready mid chip and ceramic smt antennas english. No ground plane whip antennas wireless module, antenna. This dropping of the ground plane causes the antenna to. Practical antenna design 140150 mhz vhf transceivers third. In an attic on a roof vent pipe on a wooden or metal pole on fiberglass or plastic vehicles motorhomes, trucks, boats mount it just about anywhere. Fig 23these drawings illustrate the dimensions for the 144mhz groundplane antenna. I wanted to make something simple that would be reliable and not require a balun or any impedance transforming, so i decided to build a quarter wave ground plane antenna for home. Gp 40 is a glass fibre groundplane antenna of the tripleleg type.
Before you install your antenna, select the most available open site 10 30 frequecy mhz swr 3. Antenna for 70 cm 432440 mhz category is a curation of 55 web resources on, dg7ybn gtv 702m, 432 mhz yagi antenna, experimental patch antenna. A copper pipe jpole antenna is a single band antenna that is much like a. Solid aluminum ground plane for one frequency from 32 mhz. To do the antenna takes a half of hour and to tune the antenna also takes a half of hour. The cd2 coaxial dipole has an operational bandwidth of 140150 mhz. In what follows, rory and i describe an approach which we collectively arrived at to build copper pipe jpole antennas that are easy to construct, durable, and easy to tune. Ideal for mounting on buildings available in vhf configuration 2 frequency splits rugged design to withstand the most extreme environmental conditions. After all, a ground plane antenna provides a nicer match. So239 feed connector covers 220 225 mhz with a vswr of less than 1. To attach the radials to the flange of the so239 i use small boltnutlockwasher sets in 440 size about 12 long. About this odd namegiving, pa7zee wrote in electron of nov 2003. Solid aluminum ground plane for 6 meters so239 connector gp121. Product reference guide pdf bluetoothwifi antennas english.
Laird mobile antennas and accessories are the world standard for reliable, high performance communication parts. Easy to build ham radio dual band 2 meter and 70 centimeter ground plane antenna. The gain for the ground plane is very nearly constant and equal to an isotropic antenna at low heights and real ground conditions. Its a simple antenna to build with a good bandwidth, it doesnt have any gain over a dipole because its dipole. There are usually four radials, three being a minimum, but you could use up to six. Base loaded chrome coil antennas, no ground plane 11. Ground plane antenna 27 mhz 2 pages antenna sirio antenne smp 4g lte mimo installation manual indooroutdoor compact directional multiband, 4g lte, wlan 2. So, do not waste time and go to make the bottle antenna. The broad vertical beamwidth offers excellent null fill for consistent signal coverage. Glass fibre groundplane antenna for the 40 70 mhz range description gp 40 is a glass fibre groundplane antenna of the tripleleg type. Groundplane antennas for 144, 222 and 440 mhz arrl. Base loaded no ground plane antennas vhf base loaded chrome coil antenna. Pg1ns ham radio site 2m projects omnidirectional antennas.
Fig25simple groundplane antenna for the 144, 222 and 440mhz bands. Imagine a simple 5 wire 2m ground plane antenna in freespace where the four resonant radials are horizontal. Vhf adjustable ground plane antennas 70 175 mhz gp series the gp series is a range of omnidirectional unity gain adjustable ground plane antennas ideal for local area coverage when a high gain antenna is not required or justified. Ground plane antenna for base station service working on 40 70 mhz by means of the tuning diagram enclosed. The gp series is a range of omnidirectional unity gain adjustable ground plane antennas. The cutting diagrams below indicate the length of the radiator and the radials corresponding to a specific frequency. The recent third edition3, antennas for all applications, has significant additional information. Omnidirectional antenna for wide frequency band applications. Ideal for mounting on buildings available in uhf configuration 3 frequency splits rugged design to withstand the most extreme environmental conditions. The cd17 also provides an extended bandwidth in a physical arrangement which is ideal for every application from sedans to the heaviest industrial vehicles. When autoplay is enabled, a suggested video will automatically play next. A vertical antenna with radials bent down at approximately 45 degrees will have a natural impedance around 50 ohms making it a good match to the radio in use.
Simple ground plane antennas n1gythe simple approach to. It is designed to withstand the most severe weather conditions. As the name indicates the antenna ground plane acts as a. Unity without a ground plane mwu4505s 440480 mhz 40 mhz 4.
Groundplane a solid conductive area that is an important part of rf design. Wouldnt you expect that the maximum radiation would be a few maybe 30 degrees above the plane of the radials, kind of like a. Note that the better ground conditions give a lower angle. The ground plane antenna when packed comes with ground radials removed from the antenna body for ease of packing and transportation.
Sirio antenne gpa 2745 installation manual pdf download. It is recommended to use the curves as a guide and finetune using an swrmeter. All models are mounted at the roof height approx 25 feet above the ground to provide the maximum communication range and perfect omni directional coverage. The ground plane antenna series are available in vhf and uhf configurations. Protection from lightning is provided by grounding the top section of the stub through the stainless steel tie. However when it is not possible to ground mount an antenna because of ground conditions or it is necessary to elevate the antenna, another solution is to use a ground plane. This model happens to be the 70 centimeter unit but the only difference between this one and the units for other bands is the length of the radiating element and the radials. Most of the energy at the third harmonic is launched at 44 figure 3 the original dbj1 dualband jpole. The main category is antennas projects for 432440 mhz that is about antenna for 70 cm 432440 mhz.