Quadrifilar helix antenna 2m. Ruperto, W3KH (SK) , published in the August, 1996 QST.

Quadrifilar helix antenna 2m. Therefore, it is enough to develop a ground station antenna with a good wide beamwidth isoflux radiation pattern to realise almost flat SNR. B. The low frequency Dec 21, 2023 · Various types of deployable antennas have been investigated in literature including helical antennas, conical log spirals, quadrifilar helix antennas, origami and kirigami structures, and many QFH Antennas provides circular polarization and a near hemispherical coverage. The novelty of this design is that the FPQHA needs to be designed carefully due to UAV tail dimensions and weight constraints while maintaining a high performance to be integrated in the inner part of . us is selling a combo package of 2M and 70cm quadrifilar helix antennas and a bias tee for $330. If your radio does not have this feature, we offer a Bias Tee, model BIT-1500-385 here. 1 day ago · PLEASE NOTE: There is a bug in this SCAD file. Actually, it had been calling to me ever since I saw the W3KH Quadrifilar Helix Antenna in the ARRL Satellite Handbook. Don't tape the cable tightly to the top and bottom supports. I’m Mar 1, 2018 · This project began with a desire to stick something in the attic that would cover satellites at the very high elevations that are lost with my fixed elevation yagis. The original goal of this product was to offer Amateurs with severe space or community restrictions the ability to receive 70 cm HamSat signals, and communicate through Post by v***@comcast. 4 ounces (40 grams The AS-49070 Quadrifilar Helix Antenna is a lightweight and rugged antenna which provides depressed cardioid radiation patterns in the 2. Jan 30, 2017 · The antenna have four helix, two shorter and two larger. Apr 27, 2017 · An embedded folded, printed, quadrifilar helix antenna (FPQHA) with a wide-angle coverage for unmanned aerial vehicles (UAVs) telemetry and remote control systems is presented in this article. 1 – proposed), the QHA with equal pitch and arm width (Ant. Double frequency and satisfactory antenna characteristics are achieved. By controlling This paper discusses the integration of a sliding feeding mechanism designed specifically to ensure the reconfiguration of a bi-stable Quadrifilar Helix Antenna (QHA). 3 GHz frequency band. A quadrifilar helix antenna (QHA), with an improved isoflux radiation pattern for S-band satellite ground stations, is designed and fabricated. Amateur Radio Satellite Service | Quadrifilar Helix 2M antenna from May 2018 QST May 12, 2023 · A QFH antenna for the 70 centimetre band (430-440 MHz) proved something of a challenge, as the perfect design can’t actually be physically assembled, (an issue with many great design ideas I’m told!), and feeding the antenna from the top while retaining its omnidirectional properties presents further hurdles. Furthermore, for portable and handheld radio systems, the quadrifilar helical antenna can be readily miniaturized, providing good quality circular polarization and near Mar 7, 2020 · Title: Microsoft Word - How To Build A QFH. The antenna is fed with four ports and exhibits circular polarization as well as an acceptable gain over the desired frequency range. introduce a bi-stable deployable quadri filar helix antenna that passively reconfigures its radiation characteristics in terms of pattern and polarization. The effects of modifying the antenna length and diameter on the antenna amplitude and phase performance are presented, and using the antenna for dual-frequency operation is discussed. If you own the ARRL Antenna Book, this paper is been included in the supplemental files for the chapter "Antennas for Feb 10, 2014 · This letter introduces the compact design of triple-band circularly polarized quadrifilar helix antennas (QHAs) possessing the characteristics of wide beam, high gain at the low elevation, and high stability of the phase center. For a few years now, GNSS multi-frequency quadrifilar helix antennas (QHA) are available to be used for precise GNSS applications. Finally, the characteristics of a cavity-backed four-element quadrifilar helical antenna on top of a CubeSat are investigated. orbanmicrowave. 392–397, 1975 [18] M. See the table in Materials to get the full dimensions. 1% with Jun 21, 2002 · Resonant quadrifilar helix antennas are widely used on hand-held receivers for GPS (Global Positioning System) and for some mobile communication systems. An extremely narrow version of the QFH Paul's Weather Satellite and Waffle Page from Paul Hayes. Resources listed under Quadrifilar Helix Antenna category belongs to Antennas main Apr 3, 2024 · At its most compact, the antenna is a hollow ring that stands just over 1 inch tall (2. Amin, R. 5 cm), about 5 inches (12. Since this antena is RHCP the helix needs to be turn anti-clockwise to work. These a circularly polarized signal requires the helix to have a left-hand twist. The introduction of the slots results in a reduced frequency interval between two A helical antenna is an antenna consisting of one or more conducting wires wound in the form of a helix. Many radios include a bias tee. The antenna has gain of 9-dBi at center operating frequency. The available dual-band is achieved by putting two similar antenna structures operated at different Part I: Constructing the Antenna The most important resource for preparing these instructions has been “The W3KH Quadrifilar Helix Antenna,” by Eugne F. This Nov 22, 2008 · Quadrifilar Helix antenna from Antennas. The QHA modifies its structure and deployment stages in a bi-stable fashion to radiate at 1 GHz. Jan 26, 2016 · 2. Yet, as a general-purpose base-station antenna, here for 2 meters, it's hard to beat. In one This paper introduces a pattern reconfigurable wideband circularly-polarized (CP) quadrifilar helical antenna (QHA) with both broadside and backfire radiation modes. The antenna has been designed and analysed numerically using Ansoft high-frequency structure simulator (HFSS 14. QFH stands for Quadrifilar Helix or Quadrifilar helicoidal. 00. uk/. The quadrifilar helical antenna (QHA), also known as the Kilgus coil, is mostly used for telemetry, tracking and command (TT&C) satellite systems due to its simplicity, small size, wide circularly polarized beam and insensitivity to nearby metal objects. Global Positioning System (GPS) antennas installed at fixed site infrastructure are susceptible to interference incident along the direction of the horizon. "Quadrifilar" refers including microstrip array antennas, dipoles with orthogonal feed, equiangular spiral antennas and quadrifilar helix antennas (QHAs) [1–14]. To highlight the advantages of the proposed structure, three antenna configurations are considered in simulation; the QHA with unequal pitch and arm width (Ant. It provides link to Quadrifilar Helix Antenna Calculator which is useful to design QFH antenna. Simulation results show that the antenna gain increases using the cavity while the axial ratio slightly decreases. A compact 1:4 power divider network is proposed to feed the QHA for obtaining the wide bandwidth. The simulated narrow band impedance bandwidth of the design is 2. Aug 11, 2020 · This paper proposes a compact dual‐band printed quadrifilar helix antenna (QHA) operating at GPS‐L1 (1575 ± 2 MHz) and L2 (1228 ± 2 MHz) bands. Four parallel helix-shaped radiation elements are etched on a thin F4B dielectric substrate (ε r = 3. The UC-4364-328 is a compact Quadrifilar Helix Antenna (8 cm/3" OD x 16 cm/6" H) designed to operate through Amateur Radio satellites, without requiring an antenna rotator. However, you may want to use some electrical tape to secure the cable to the ends of the supports. The performance of the antenna with respect to its beam pattern, axial ratio and efficiency is investigated. category is a curation of 17 web resources on , NOAA Satellite Reception with QFH Antenna, The Quadrifilar Helix Antenna, How To Build a Quadrifilar Helix Antenna for Weather Satellites. 10 metres, single core earth cable (green & yellow), 10mm 2 - this was used for the actual antenna elements. The four antennas are usually assumed as a single antenna with four isolated or connected arms [17]. com 5 The quadrifilar helix need not be a long traveling wave antenna, but can be shortened to sizes commensurate with ½ a wavelength and operated as a resonant antenna, much like Feb 2, 2017 · 3 Results and discussion. The quadrifilar helix line is printed on the surface of a cylinder substrate with high dielectric permittivity. We performed test measurements with two types of multi-frequency QHA and compared them with a geodetic patch antenna. In this paper we present a new quadrifilar helix antenna designed for CubeSat applications. askrlc. 1 to 2. On This Page AS-49070 Specifications Quadrifilar Helix 2M antenna from May 2018 QST. Due to the construction of the antenna the satellites are picked up at a very low angle above the horizon, but equally well when right over the antenna. 120MHz: LUSAT-OSCAR 19 20081123 1615UTC. The characteristics of the quadrifilar helix antenna [1] and [2], a broad-band high-gain device, are described in detail. A specialized antenna used in radio astronomy and satellite communication, the Quadrifilar Helix (QFH) antenna is made to receive circularly polarized transmissions. 46, No. In order to satisfy the RHCP requirement, these antennas have to be directed towards the satellite. Cahill, “Bandwidth Limitation Of Two-Port Fed and self-Phased quadrifilar Helix Antennas”, Microwave and Optical Technology Letters, Vol. 2 mm). Jun 7, 2010 · quadrifilar helix antenna for the 2m band using cooper pipe and pvc pipes by ki6yrd. Cebik, W4RNL “An EZ‐Lindenblad Antenna for 2 Meters” by Anthony Monteiro, AA2TX Converted C‐Band TVRO Dishes PDF “Double-Cross Antenna – A NOAA Satellite Downlink Antenna” by Gerald Martes, This is where the QFH Antenna comes in, it's actually two antennas, a small one inside a bigger one, that is of the proper dimensions so that it blocks out surrounding interference and receives signals very well on the 137. This is a recording of the LUSAT-OSCAR 19 CW beacon which was on 437. To excite the four arms with constant amplitude as well as quadrant phase difference throughout the whole bandwidth, we design a wideband feed network in a shunt-fed format and use one 180° ring hybrid and two Wilkinson dividers to satisfy the requirement. Bandwidths in excess of 5:1 are obtained. The original goal of this product was to offer Amateurs with severe space or community restrictions the ability to receive 70 cm HamSat signals, and communicate through The SQFH400 Quadrifilar Helix antenna is heavy duty and rugged Quadrifilar Helix antennas, supplied with radome to protect the antenna from environment. Two Small Helical Antennas for 2 Meters - W6NBC In this video I'm attempting to make a fancier antenna for listening to NOAA weather satellites. Here are the essential functions of it: 1. This model is for meteorological satellites, but a calculator is provided to adapt measure to other frequencies. Mar 8, 2018 · A novel frequency-independent printed quadrifilar helix antenna with wideband performance is presented in this paper. net Antennas. The ARRL Antenna Handbook The American Radio Relay League (Information at Amazon. Please see the comments or edit the file and put [D1/2,0,0] and Dec 21, 2023 · Various types of deployable antennas have been investigated in literature including helical antennas, conical log spirals, quadrifilar helix antennas, origami and kirigami structures, and many other topologies 5 – 14. The overall antenna including a feeding network and a radome is 110 mm in diameter and 142 mm in height and it has a gain of over Mar 21, 2018 · I'm using it for NOAA and 2m ham sat band, 73 de DE8MSH Marco. Oct 26, 2009 · A new quadrifilar helix antenna (QHA) with integrated feed network is designed for satellite mobile communication systems. Although code and carrier phase noise and high-frequent multipath was determined to be larger as compared to the geodetic antenna, the fast-static Sep 16, 2021 · The structure of the proposed antenna is shown in Figure 1a. In this paper, we propose an improved S-band quadrifilar helix antenna (QHA) with an isoflux radiation pattern and a power Jan 22, 2024 · The new "bi-stable deployable quadrifilar helix antenna" does away with the support, and replaces the wires with strips of a conductive fiber composite material – these are wound together in a antennas and their combination for size reduction and dual-band operation [14]. This odd looking thing is a quadrifilar helix antenna and it's specially designed to receive images from the NOAA weather satellites. The paper investigates a quadrifilar helix antenna over a ground plane and with trap loading. com/ant/qfh/index. The feeding mechanism is integrated within the ground plane of the QHA and slides with the changes in its topology. 20% with VSWR satellite antennas have a uniform coverage of their target area on the Earth. php. When used in a fixed position (directed towards the sky), these antennas are linearly polarised at the LEO/Amateur Satellite Quadrifilar Helix Antenna (QFHA): Frequently Asked Questions. Resources listed under Satellite Antenna category belongs to Antennas main collection, and get reviewed and rated by amateur radio operators. A helix becomes a linear antenna when its diameter approaches zero or pitch angle goes to 90º. Then, the radiation patterns, array gain, and axial ratio are depicted. Materials⌗ For this particular antenna I used 8mm The helical antenna is a hybrid of two simple radiating elements, the dipole and loop antennas. Description of the construction of a quadrifilar helicoidal antenna. The phase distribution along A Quadrifilar Helix Antenna for 137 MHz By George Goodroe, KF4CPJ. 23,pp. There are four ports at the bottom of the antenna, and a microstrip line feeding network is adopted combining the four ports to one final port. The proposed antenna consists of a reconfigurable radiator and a switchable feeding network. One point to bear in mind: sharp bends in the cable are to be avoided, and could affect the performance of the antenna. It's actually two antennas that are formed by a larger loop and a smaller loop. 5 provide perfect matching and increased antenna efficiency with the peak gain of 5 dBi. Disposed within each gap and electrically Helical or Helix Antennas transmit a circular polarized wave. Cylindrical enclosure is used for low wind loading and for minimal effect of ice formation on the Quadrifilar Helix antenna operation as well as providing an aesthetically pleasing appearance. The radiator combines two individual QHAs in a cuboid, which can be alternatively activated. (Lindenblad-antenna, turnstile antenna, cloverleaf antenna, crossed yagi [1-3]). Another example is the quadrifilar helical antenna (QHA) that uses four entwined helical antennas [ 15–17]. Apr 1, 2014 · 2m x 32mm PVC pipe (for the stand) 2m x 21. Nov 25, 2003 · Dual-band quadrifilar helix antennas, comprising four radiating elements arranged helically to define a cylinder of constant radius, each radiating element having an upper portion and a lower portion and a gap there between, each upper portion having an open end, and each lower portion having a feed point for receiving feed signals in phase quadrature. www. The feeding network provides switchable quadrature excitations to the radiator. The first antenna employs a novel method of reactive loading along the length of the multi-turn helix. The antennae in this design have same size with axial lengths of 24 mm and diameters of 18 mm. The UC-4364-328 is a compact Quadrifilar Helix antenna (8 cm/3" OD x 16 cm/6" H) designed to operate through Amateur Radio satellites, without requiring an antenna rotator. John E. Nov 16, 2010 · 3. Mar 10, 2015 · This algorithm is used in conjunction with multi-objective optimization to create two quadrifilar helix antennas (QHAs) and one monopole antenna, all with unique electromagnetic The Quadrifilar Helical Antenna (QHA, or QFH if you prefer) has two defining properties: (1) Its radiation pattern is just about as perfectly hemispherical as you will ever find. Fairly easy to build using parts from Menards. The proposed Quadrifilar Helix antenna is exhibiting narrow-band radiation pattern around 60GHz frequency spectrum. us sitting about a foot above the ground (hi hi)outside. Hi SatNOGS team. 2. By comparison between radiation patterns of other the cylindrical helical antennas, a multi-resonance conical and inverted conical printed quadrifilar helical antenna with wider beam-width and higher gain at broadside is proposed in [16]. co. com) A Quadrifilar Helix Antenna for 137 MHz De George Goodroe, KF4CPJ. A self-phased quadrifilar helix antenna is designed, simulated, fabricated and measured for use in Army air-to-ground and airborne-assisted ground-to-ground communication systems. To improve the axial ratio (AR) over a broad angular region, inverted conical reflector and cylindrical reflector on inverted cone are introduced under QHA. Enter the Wavelength, Number of Turns and the space between each coil to calculate the Antenna Gain, wire diameter, Half Power Beam Width, Beam Width First Nulls and Effective Apperature. The cable is a common coaxial cable, fancy shielding isn’t required for this length and frequency. The quadrifilar helical antenna. The satellite communication systems and satellite navigation systems usually require the antenna to provide compact size, wide beam, circular polarization and high gain at low elevation. Portune, W6NBC esigned for spacecraft use in the early days of space exploration, the quadrifilar helix (QFH) antenna has not gained much popularity on the ham bands. A popular usage is for satellite reception. Helical and spiral an- tennas inherently are able to produce circular polarization over a wide bandwidth [5]. Amateur Satellite Antennas category is a curation of 73 web resources on , Compact and effective 2m 70cm antenna, Portable satellite antenna, UHF Satellite Yagi. Furthermore, for portable and handheld radio systems, the quadrifilar helical antenna can be readily miniaturized, providing good quality circular polarization and near A compact and wideband quadrifilar helix antenna is presented in the paper. It’s a cool looking antenna. We hope these posts and their responses will help other visitors having similar interests and inquiries. A model of this antenna was built to operate at two frequency bands, 1227 MHz and 1575 MHz, with more than 2% bandwidth in each band. This page covers QFH Antenna basics and QFH antenna calculator. The frequency of operation is 60 GHz. 11-15, 2005 3 days ago · Circular polarised antenna for reception of NOAA weather satellites on 137 MHz, or ACARS transmissions on 135 MHz. Experimental data on beam patterns, impedance, and axial ratio are given for both the circularly polarized quadrifilar helix antenna (QHA) and the linearly polarized counterwound quadrifilar helix antenna (CQHA). The quadrifilar helix antenna presented in this paper covers the UHF bandwidth between 250 MHz and 500 MHz. The antenna is designed, simulated and optimized. Taming the QFH Antenna by Bill Sykes G2HCG and Bob Cobey G0HPO http://www. The resonant quadrifilar helix antennas have been widely applied to space communication links due to its relatively small volume and wide beam An analytic model for computing the radiation properties of the quadrifilar helix volute antenna is discussed and various design considerations for GPS applications are presented. 5 cm) across—not much larger than a bracelet—and weighs 1. 1, pp. The effects of phase imbalances Jan 1, 2016 · Its input impedance is approximately pure resistance, and the pattern is independent of the number of helical turns [15]. This article presents a polarization reconfigurable dual integrated quadrifilar helix antenna array that is embedded within a cylindrical-shaped mesh of dielectric material. Then Cubesat OSCAR-57 flew over: “A Portable Helix for 435 MHz” by Jim McKim, WØCY “A Simple Fixed Antenna for VHF/UHF Satellite Work” by L. The 70cm antenna has a built-in 15db LNA BTW. 5mm PVC pipe (for the horizontal arms) A pack of cable ties, just to keep things neat; 15+ metres of 50 ohm coax cable. The quadrifilar helix antenna is now ready to use. Based on these needs, a new type of dual-band wide beamwidth quadrifilar helix antenna (QHA) is designed. An example of a quadrifilar helix antenna over a ground plane and with trap loading is shown in the first figure. Construction is cheap, and materials are easily available. For microstrip array [2, 3] and orthogonal dipole antennas [4], the circularly polarised characteristics would be deteriorated when the antenna is away from the direction of maximum radiation. Feb 1, 2005 · There are many applications for the Quadrifilar Helix Antenna (QHA), because of its cardioid-shaped circularly polarized beam [1], such as global positioning systems [2,3], mobile handsets and Mar 10, 2015 · For such demanding applications, the axial-mode quadrifilar helical antenna provides a high performance and robust antenna platform both in space as well as on the ground. The GPS systems, for example, which have low bandwidth requirements use microstrip patch antennas and, in some cases, quadrifilar helix antennas [1], [ 2 ]. The proposed antenna utilizes four simple gradient microstrip lines as radiators, which are wrapped around a thin cylindrical dielectric substrate. This antenna is unique in its simplicity of design and powerful performance compared with standard directional receivers. en. Each microstrip line has etched two slots. Quadrifilar Helix Antenna. While the deployable aspect of these antennas constitutes a major component of this work, the reconfiguration of these Jun 9, 2007 · A dual-frequency enclosed antenna is designed with two 3/4 wavelength quadrifilar helix antennas and a novel feed structure combined feed network with infinite microstrip balun, which makes the antenna achieve wider angle circular polarization. These loops are shaped to receive a signal on 137MHz frequency and block out the rest of the noise. (2) Its radiation is just about as perfectly circularly polarized as you will ever find, in all directions . To generate the dual operating bands, two interconnected lines with unequal lengths are introduced as a radiating element. The effect of the metallic ground plane provided by the aircraft Bibliography on quadrifilar antennas. The KE-137 is a quadrifilar helicoidal (QFH) antenna. Helical Structure: The QFH antenna is made up of two or more helical conductors that have been coiled into a helix. Feb 16, 2015 · A novel multi-frequency printed quadrifilar helix antenna based on Multiple arm technique is presented in this paper. The entire structure is 3-D-printed and equipped with grooves to support the eight radiating elements and accordingly enforce the helical pitch and orientation. 0). Post by v***@comcast. In this paper, a series of quadrifilar helical antennas are presented for the application of GPS timing. I used D as a radius for the helixes. The available triple-band operation is achieved through the incorporation of a UHF-band QHA and an L/S-band QHA, which are assembled in a “piggyback” fashion. the order of a meter . Bibliography on quadrifilar antennas. Feed Network Configuration. John Coppens ON6JC/LW3HAZ describes how to make a Quadrifilar Helicoidal antenna http://jcoppens. This is called a "Quadrifilar Helix" or QFH Antenna. 5 MHz frequency band that the NOAA satellites transmit around. 003, h = 0. Figure 2 shows the extended view of the parallel helix-shaped radiation elements. In [12,13,14,15,16], various antenna types proposed for CubeSat were designed and analyzed, such as monopole, dipole, helical, patch, slot, phase array, reflect array, and metamaterial-based antennas. 5, tan δ = 0. The default UC-AMSAT-KIT kit includes (you can customize the kit): One (1) UC-1464-531L LHCP VHF antenna One (1) UC-4364-513R RHCP UHF antenna backfire Quadrifilar helix”, IEEE Transactions of Antennas and Propagation, Vol. 2 – conventional QHA) and the The DC power is needed by the Low Noise Amplifier inside the antenna to operate. Aug 17, 2020 · In this article, we present a method for designing miniaturized and broadband quadrifilar helix antenna, which has better bandwidth than other smaller antennas and more compact than larger bandwidth antennas. Ruperto, W3KH (SK) , published in the August, 1996 QST. We use infinite stripline baluns to feed the helical antenna. To realize pattern diversity, PIN diodes on the power divider are to reconfigure the sequences of the output phases such that the May 12, 2023 · The answer: Use a Quadrifilar Helix Antenna! This strange-looking antenna, often named the egg-beater antenna (for obvious reasons), was invented in the 1940s and has become something of a stablemate for modern satellite communications, and also other uses such as wifi. The feeding network plays a critical role on ensuring the antenna’s performance. docx Author: crein Created Date: 3/7/2020 11:01:45 AM For such demanding applications, the axial-mode quadrifilar helical antenna provides a high performance and robust antenna platform both in space as well as on the ground. The one I got was with Right-Hand Circular Polarization (RHCP) and is rated for 50watts output. The four wires Jun 6, 2023 · Antenna design is a challenge for researchers due to the limitations of size, mass, operating frequency, and required bandwidth. Below are frequently asked questions of our Amateur Satellite antennas received from visitors via email. The Quadrifilar Helix Antenna (QHA) is a simple and inexpensive solution to the problem of non-geosynchronous satellite research. John E. To enhance the bandwidth, three-stage stepped impedance spiral arm In this paper an extremely compact 4-wired Quadrifilar Helix Antenna (QHA) designed and simulated. Making a Quadrifilar Helix Antenna. I would like to see a Quadrifilar Helix Antenna option in antenna setup menu. The dual antenna array, acting as one, features double May 1, 2013 · The open-circuit quadrifilar helix antenna (O-C QHA), sometimes referred to as a volute antenna, consists of four helical windings oriented 90° with respect to one another, with each winding Mar 16, 2018 · A novel cuboid quadrifilar helical antenna (QHA) with polarization and pattern reconfigurabilities is presented. In most cases, directional helical antennas are mounted May 17, 2019 · A quadrifilar helix antenna (QHA), with an improved isoflux radiation pattern for S-band satellite ground stations, is designed and fabricated. In this article, we present a method for designing miniaturized and broadband quadrifilar helix antenna, which has better bandwidth than other smaller antennas and more compact than larger bandwidth antennas. The goal of this product is to offer Amateurs with severe space or community restrictions the ability to receive 70 cm HamSat signals, and communicate through orbiting Quadrifilar Helix Antenna uses a self facing design and is a full wave Helix for perfect RHCP/LHCP, circularly polarized, suitable for a Pole-Mount. A helical antenna made of one helical wire, the most common type, is called monofilar, while antennas with two or four wires in a helix are called bifilar, or quadrifilar, respectively. After I became a licensed amateur radio operator in August of 1995, I received a QST magazine which had an article that explained it was possible with the right antenna, the Quadrifilar Helix antenna (QHA), to receive the 137 MHz weather satellite transmissions. This paper proposes a quadrifilar helix antenna (QHA) to provide wider elevation angle with low axial ratio. The Helix uses copper tubing for filar windings and the low VSWR below 1:1. Listed under the Antennas/2M category that is about Antennas for 2 meters band. lzdf qibyzee flgs sglcpzt tsirp jmtkyf rhyvyfjc iikyb ixu wvfov