After completing this tutorial, you will be able to calculate the. Introduction an antenna is an electrical conductor or system of conductors otransmission radiates electromagnetic energy into. Andrew db224 a 150 160 mhz omni exposed dipole antenna. Modify a 150160 mhz db222 or db224 for the ham band. It is a measure for the maximum received power p r that an antenna can pick up from a plane wave of the. Next, attach the cross braces to the rear of the reflector as shown using supplied. Db224a omni, exposed dipole antenna, 150160 mhz, 360 horizontal beamwidth, fixed electrical tilt lbroad response ltwopiece mast for ease of shipping electrical specifications frequency band, mhz 150160 gain, dbi 8. Starting with hertzs antenna model followed by a short introduction to the fundamentals of wave propagation, the. Universal db222a repeater antenna discount twoway radio. Andrew db224a 150 160 mhz omni exposed dipole antenna.
Change text and images quickly and easily in pdf documents. It consists of two independent antennas on the same mast. As a matter of interest, we use the windom buxcomm model 8024 up to. Each antenna was assembled, piece by piece, at the. It is intended for technicians who are, or plan to become professional antenna installers. About the tutorial this tutorial is meant to provide the readers a detailed description of the antennas used in communication systems. This time, at 145 mhz i ran 25 watts into the antenna and got about 1.
Clamps for top mounting are supplied with the antenna. The receiving properties of antennas are characterized by the antenna affective area af,t,i, where the available power at the output of the receiving antenna prf is the product of the effective area of the receiving antenna in direction t,i and the flux density swm2hz1 incident from that direction. Jun 05, 2006 there is also the db224s split version of the db224. Isotropic antenna idealized oradiates power equally in all directions dipole antennas ohalfwave dipole antenna or hertz antenna oquarterwave vertical antenna or marconi antenna parabolic reflective antenna oused for terrestrial microwave and satellite applications olarger the diameter, the more tightly directional is the beam. Commscope db224c 164174 mhz 6 db 4bay dipole omni base station antenna. This antenna mounting kit features galvanized steel construction and. A harness with n male connection is included along with the db3650s pipe mount kit for 1. There is also the db224s split version of the db224. Commscopeandrew db224b andrew omni exposed dipole antenna. Antenna characteristics page 3 a 3d power pattern b 2d power pattern in rectilinear format figure 5. Commscope andrew solutions db224b omni, exposed dipole antenna, 155165 mhz, 360 horizontal beamwidth, fixed electrical tilt. Power patterns for an arbitrary antenna 2 the maximum sidelobe level sll is often of concern to antenna designers, particularly if the antenna was designed to focus power in a speci c direction, since sidelobes essentially represent a.
The far field an electromagnetic field launched by the antenna. Omni, exposed dipole antenna, 8150 mhz, 360 horizontal beamwidth, fixed electrical tilt lbroad response ltwopiece mast for ease of shipping db224e electrical specifications frequency band, mhz 8150 beamwidth, horizontal, degrees 360 gain, dbi 8. The db224 is a heavy duty, light weight, high gain antenna. Joel huntley wa1zyx home page email this page describes what needs to be done to modify a db products db212 folded dipole antenna only, not the cable harness if. The side mount kit bracket will hold antenna 20 inches away from the tower with 3 inch diameter legs. Broad response 10 mhz bandwidth provides optimum performance in single or multifrequency systems, on both transmit and receive.
Broad response bandwidth allows antenna to perform efficiently on both transmit and receive. This adjustable field omni antenna has a maximum power input of 500 watts. The success of the three previous editions of practical antenna handbook has been most gratifying. Get more information about smart antenna pdf free download by visiting this link. Figure 2this eznec plot shows the difference in the radiation patterns between a vertical halfwave radiator operated at its fundamental. Db224b 155165 mhz 6 db 4bay dipole omni base station. This windom handbook is the most read windom antenna handbook, and the most duplicated document by both amateurs and commercial builders. This popular antenna is available with four folded dipoles for high gain and broad bandwidth.
Learn how to edit pdf files using adobe acrobat dc. This popular antenna is available with two folded dipoles, db222, or with a single folded dipole, db220. The near field an electromagnetic field that exists within. Flexible array available with dipoles aligned collinearly for an offset pattern or with dipoles on the opposite sides of the mast for a circular. An antennas properties are the same, whether it is used for transmitting or receiving. A smart antenna consists of several antenna elements, whose signal are processed adaptively in order to exploit the spatial domain. Db224 broad band antenna, 6 or 9 db gain, 8174 and 220222 mhz. After completing this tutorial, you will be able to calculate the parameters of an antenna and decide which antenna suits for which type of application and why. Db222a 150158 mhz 3 db 2bay dipole omni base station. It is suitable for mounting to the top or on the side of a tower. A smart antenna consists of several antenna elements, whose signal are processed adaptively in order to exploit the spatial domain of the mobile radio channel. This antenna mounting kit features galvanized steel construction and stainless steel hardware.
The effective area aw of an antenna is a parameter specially defined for receiving antennas. Left, both sets of elements joined with the combiner bars. That assumption proved to be correct as i have received letters from a wide variety of people. It is a measure for the maximum received power p r that an antenna can pick up from a plane wave of the power density s. Power patterns for an arbitrary antenna 2 the maximum sidelobe level sll is often of concern to.
Antenna fundamentals an antenna is a device for converting electromagnetic radiation in space into electrical currents in conductors or viceversa, depending on whether it is being used for receiving or for transmitting, respectively. As a matter of interest, we use the windom buxcomm model 8024 up to 2 meters 146 mhz. Db224e omni exposed dipole antenna, 8150 mhz, commscope. Cornerreflector antennas light bar mounted on the roof ahead of the antenna. Db224 omni mounted on side of tower db224e elements pointed toward the tower db224e elements pointed away from the tower d b 2 2 4 d b 2 2 4. Attach combining bars to the binding posts on the antenna bow tie elements. This popular antenna is available with four folded dipoles for high gain and bro a d. Db224 omni mounted on side of tower db224e elements pointed toward the tower db224e elements pointed away from the tower d b 2 2 4 d b 2 2 4 e db224 ve r tical pattern model.
The ability of an antenna to focus electromagnetic energy is defined by its gain. Commscopeandrew db264c andrew base station antennas. There was a time, not so long ago, when the db224 was made in the usa. Commscope andrew solutions db224 b omni, exposed dipole antenna, 155165 mhz, 360 horizontal beamwidth, fixed electrical tilt. This electrically joins both halves of the antenna. Leading supplier of wireless communications infrastructure and mobile products. Broad responsebandwidth allows antenna to perform efficiently on both transmit and receive. Talley stocks a wide variety of infrastructure products. A harness with n male connection is included along with the. Commscope andrew solutions db224e omni, exposed dipole antenna, 8150 mhz, 360 horizontal beamwidth, fixed electrical tilt. How to edit a pdf adobe acrobat dc adobe document cloud. Antenna gain relative to a dipole antenna can be expressed in decibels as dbd. A w although the effective area of an antenna can well be conceived as a real area perpendicular to the. Starting with hertzs antenna model followed by a short introduction to the fundamentals of wave propagation, the important general characteristics of an antenna and its associated parameters are explained.
A mobile antenna horizontalplane pattern figure 12. These antennas were a favorite among the paging industry for their loband operations, primarily in the 43 mhz range. Model db224 is a high gain, lightweight, high strength antenna for use in the 8285 mhz band. It temporarily stores power and is related to the imaginary term of the input impedance. Thus, an antenna with a gain of 3 dbd would have a gain of 5. A vhfuhf dualband jpole searching for an inexpensive, highperformance dualband base antenna for vhf and uhf. Antenna fundamentals an antenna is a device for converting electromagnetic radiation in space into electrical currents in conductors or viceversa, depending on whether it is being used for receiving or. The receiving properties of antennas are characterized by the antenna affective area af,t,i, where the available power at the output of the receiving antenna prf is the product of the effective area of the. The db224 mast is twopiece addresses steves comment on shipping length. These companies provide a variety of 3day, 2day, overnight and international options to choose from. I have had bunches of db222, db224 and db264s 150160 mhz for quite some time but have been reluctant to use them on 2 meters below. Wisco international decibel products dipoles db220. Back in the 1940s, tv antennas were actually manufactured by hand at the installation site. Joel huntley wa1zyx home page email this page describes what needs to be done to modify a db products db212 folded dipole antenna only, not the cable harness if there is one.
Db224 a omni exposed dipole antenna, 150160 mhz, 360 horizontal beamwidth, fixed electrical tilt lbroad response ltwopiece mast for ease of shipping electrical specifications frequency band, mhz 150160. The andrew solutions db5001 antenna side mount kit is for mounting andrew antennas db222, db224, db264, db314, and db315. Db224e omni exposed dipole antenna, 8150 mhz, 360 horizontal beamwidth, fixed electrical tilt, mfr. The antenna was then taken down and modified as shown below, then put back up, and the same test run. This popular antenna is available with four folded dipoles for high gain and. But only a professional can select and precisely install the correct antenna and assure his customers years of superior tvfm reception. Like so many other companies db products, the company, was sold to andrew and then to comscope. It is factory adjusted and checked for minimum vswr over a wide band of frequencies. Doug zastrow, wboupj dzastro at qwest dot net lower bottom clamping area 1 12 from bottom of mast upper bottom clamping area 17 12 from bottom of mast not drawn to scale. Request a quote sell to us andrew omni exposed dipole antenna, 155165 mhz, 360 horizontal beamwidth, fixed electrical tilt. Broad response 10 mhz bandwidth provides optimum performance in single or multifrequency systems.