Uhf Antenna Design Calculator

In 1924 Stuart Ballantine published two historic papers which led to the development of the single mast antenna. The antenna you have purchased has taken this principle even further with its triple boom design. They span about 520 MHz to 820 MHz. This is typical of VHF and UHF arrays. POPtronix Discone VHF-UHF Antenna www. AS-IS YAESU FT 290MkII 2 Meter 144mhz Portable All Mode HAM RADIO #hX61622. Posts about antenna written by fahriemje2012. (8 SEMESTER) ELECTRONICS AND COMMUNICATION ENGINEERING CURRICU. This calculator is designed to give the horizontal length of a particular dipole (including Tees) antenna, or one side of it, for the frequency chosen. His design only covered a part of UHF band. A couple of charts from EZNEC will help show what the calculations claim for this antenna. at category uhf circuit : RF CircuitsCircuits and Schematics at Next. RFID-UHF-Antennas 11 5 Reader output power The maximum output power for the reader is defined by the ETSI standard EN 302 208-1 V1 2 1 (dated April 2008) It is defined by the antenna gain, the half power beam width and the cable attenuation on the reader - antenna connection For antennas with a half power beam width of up to 70° a power of. While most OTA TV antennas on the market are designed to capture both frequencies, some antennas are optimized primarily to capture UHF channels. 54 cm shorter. Remember in our first example the impedance at the end of section "B" was 50 ohms. 7:1 at 146 MHz, indicating that the antenna is a bit long. Hardware design made easy. Dish Antenna Design A dish antenna works the same way as a reflecting optical telescope. A Bazooka Balun. The more surface area an antenna has the more signal it will capture. In this paper, we present a wearable antenna design and process using genetic algorithm (GA) optimization. Q) I would like to know the difference between TRA6927M3PW-001 and TRA6927M3PWN-001, which makes the gains so much different. 1: Length correction factor for half-wave dipole as a func-tion of diameter. ) within a radius of about 10000 km or even more if the propagation is very good (during the maximum of the solar cycle), this design is not as efficient as an rotatble Yagi antenna cut at the working wavelength. This yagi will give … Continue reading "Building the gamma match for 4 Elements Yagi". Shoppers sometimes have a hard time making a decision on which will be best for their needs and will ask which is better for them. 5 dB overall and a degradation of noise figure of an extra 0. The Tiny 2+1 Renamed the Tiny 3. Enter the formula for the antenna (normally 585/f or 178. Work Profile – Duplex ground antenna systems for satellite communication through the GEO satellites in” L”, “C”, “X”, “Ku”, “Ka” frequency bands, simplex antenna systems for receiving telemetry data, video and sound data from LEO satellites (ISS) in VHF and UHF frequency bands, antenna systems for Radar in “Ku” frequency band. The proposed design curves are used to design a Bow-Tie type RFID tag antenna. com in 2 categories. Back to Designing and building a GSM antenna - Yagi Design The design. Instructions are included below for building the antenna in an example for 147. Navigation is also easy and the menu bar features exactly the options needed for the tasks required to develop yagi antennas. cores PN 2661540002 were selected for the UHF antenna design, both from “Fair-Rite” Products. I don;t know if www. Enter the required frequency in MHz and the antenna designer will calculate the dimensions of the elements as shown below. While most OTA TV antennas on the market are designed to capture both frequencies, some antennas are optimized primarily to capture UHF channels. The article was titled Extremely Long Yagi Antennas. by Michael Martens | Nov 3, 2013 | Antennas. In 1924 Stuart Ballantine published two historic papers which led to the development of the single mast antenna. Figure 2: Optimized design 1 of Yagi Uda Antenna From antenna parameter of this designed as shown in table 3 we concluded that power radiated by five elements Yagi-Uda antenna is 0. VHF/UHF/microwave antennas And many more GO TO WWW. A free online environment where users can create, edit, and share electrical schematics, or convert between popular file formats like Eagle, Altium, and OrCAD. HAAT Calculations: Which antenna will work best for me. Back to Designing and building a GSM antenna - Yagi Design The design. Helical Antenna Design Calculator. Example: Loop PCB This example is , Design , PCB Abstract This paper describes two basic methods to design RFID UHF antenna on a PCB. Larger C/Λ tightens the radiation pattern at the expense of circularity. 25" EMT electrical conduit from a big box home improvement store for the pole. Typically, the pitch angle is taken as 13 degrees. Shoppers sometimes have a hard time making a decision on which will be best for their needs and will ask which is better for them. However, fractal antennas and its superset fractal electrodynamics [Werner and Mittra, 1999] is a hotbed of research activity. Model # Band Element Phasing/ Wavelength Gain/dBi Watts Mount Length Inches; CR627B: 6m / 2m / 70cm : 1 1/4l, 3 1/4l, 3 5/8l: 2. The measurements below are for building a simple Dipole Antenna. An antenna analysis program. Enter the required frequency in MHz and the antenna designer will calculate the dimensions of the elements as shown below. Usable with all available UHF readers. Tallysman Wireless - Calian Acquires GNSS Antenna Company, Tallysman for $24. The original design was started when a friend wanted to build a cheap and effective TV antenna for his girlfriend's TV. The addition of more directors to the system with a phase difference in two axis allows greater manipulation of the beam pattern and directivity of the antenna. It has some really interesting properties and it is a fantastic first time antenna project for the beginner. 15 ANNA UNIVERSITY CHENNAI : : CHENNAI – 600 025 AFFILIATED INSTITUTIONS B. BUILD YOUR YAGI ANTENNA. In other words his original antenna was unable to cover the entire UHF band. The larger the wire, the wider the bandwidth. Brings you all the tools to tackle projects big and small - combining real-world components with online collaboration. It is a RFID reader, working in the 912-928 UHF band. scarc vhf/uhf j pole antenna This antenna provides continuous coverage of the 2 metre (144 – 148MHz) and 70cm (430 – 450MHz) bands and is an excellent choice for base station use. THE TOTAL LENGTH OF YOUR DIPOLE IS:. Remember in our first example the impedance at the end of section "B" was 50 ohms. An antenna which length is multiple of λ/2 is a resonant antenna. This is often a good solution since it utilizes unused volume for a product. A while ago I upgraded my TV antenna in preparation for Digital Switch-Over here in the UK. 5dB and the second one is 0dB. This is my home built UHF TV antenna. GLUE SHOULDER WASHER INSULATOR TOP WASHER DIA. Tallysman Wireless - Calian Acquires GNSS Antenna Company, Tallysman for $24. Carr's Practical Antenna Handbook, Third Edition is a work for anyone, ham radio operators, shortwave radio listener's -- anyone with an interest in antennas, from the newest of novices to the. Resources listed under Antenna Calculators category belongs to Antennas main collection, and get reviewed and rated by amateur radio operators. Instructions are included below for building the antenna in an example for 147. Instructions are included below for building the antenna in an example for 147. Bowtie Antenna basics | Bowtie Antenna Calculator. e-mail-adress: dk7zb(at)darc. Unique design. • Feeding the Antenna can be done at the Director or at the Reflector. The antenna you have purchased has taken this principle even further with its triple boom design. I have found this program easy to install. Ch14, 470 MHz 1/4 wave = 5. Axial-Mode Helical Antenna Calculator. VHF/UHF/microwave antennas And many more GO TO WWW. This website gives you expected stations and levels that you can expect. The measurements below are for building a simple Dipole Antenna. Typically, the pitch angle is taken as 13 degrees. 308/f for metric):. ) 7031xxx: 2 Element Yagi Antenna: 50 - 250. The reader is composed of local oscillator (LO), a transmitter, a receiver and an antenna. RG-59 has a lot of signal loss in the UHF range, RG-6 has a lot less signal loss. Elk Antennas was started to give the Ham the best Log Periodic antennas with the best gain, directivitiy, and front-to-back ratio possible for the size and price. The Zenith Indoor Passive VHF/UHF Antenna is HDTV compatible and provides 1080p or 720p programming. scarc vhf/uhf j pole antenna This antenna provides continuous coverage of the 2 metre (144 – 148MHz) and 70cm (430 – 450MHz) bands and is an excellent choice for base station use. YW comes with the ARRL Antenna Book. The gamma tube for the 4 Elements yagi is about 2. For 2 meters, the coil is 4 turns of coax at 5 inches in diameter. It is a omnidirectional antenna which has the same gain in every direction. Also, you will want an antenna that is physically strong, so it will stay up through many years of storms. The ClearStream 4MAX Indoor/Outdoor UHF/VHF HDTV antenna features quick-connect assembly and is scientifically proven to out-perform the competition for reliable, ultra-long-range HDTV reception. Cross Field Antennas-- from GM3HAT & W5QJR Cross Field Antenna ConstructionBy G3YCC Cubical Quad Antenna Calculator-- From KD6DKS Cubical Quad Antenna Design-- from N6VNG Cubical Quadsfrom EI7BA. 3/4” TO 1” WITH HOLE TO PASS #6 SCREW BOTTOM WASHER O. For a given frequency, the feedpoint impedance is calculated, along with theoretical. In 1924 Stuart Ballantine published two historic papers which led to the development of the single mast antenna. It was replaced by the Creative Design CLP5130-1N described here. Figure-1 depicts typical Bowtie Antenna. Antennas • The antenna is VERY important if long range is important • A quarter wave antenna is an easy and good solution, but it is not small (433 MHz: 16. 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. For the first one, peak gain at 698-960 is 3. But if you have a 1/4 wave, 5/8th's wave, etc, you do want the ground plane under the vertical antenna. The design first originated in England in the late 40's and was first used by Sinclair in the 50's for their x10 series antenna arrays. In the picture notice the longer elements (rods) protruding from the EZ HD antenna boom? There are four of them on each side spaced and cut to length to receive the VHF frequency wave pattern. com in 2 categories. The design of Octagonal-shaped microstrip patch antenna consist of antenna width (W), antenna length (L) and a feed line which have impedance of 50 ohm. RG-59 has a lot of signal loss in the UHF range, RG-6 has a lot less signal loss. Enter the desired frequency and select the desired calculation from the drop box. Axial-Mode Helical Antenna Calculator. Text: antenna design capability, NXP 's RDC provides the capability to quickly validate the expected , Improving Radio Frequency IDentification systems RFID Reference Design Center 2 NXP , systems 3 UHF Label Antenna Design Antenna Design plays a key role in success of RFID , the complex task of UHF antenna design. videos, articles, reference designs, conversion calculators, product. ) 7031xxx: 2 Element Yagi Antenna: 50 - 250. They are one of the easiest to design. Arrow Antenna is now offering FREE SHIPPING on orders over $100 and $5 Flat Rate Shipping for orders up to $100 to the lower 48, Flat Rate Shipping of $15 for all orders to Alaska and Hawaii and $30 for US Territories and APO. In this work, the optimal third order Peano fractal antenna designed in our previous work [33] is used as the. dBi means relative to an isotropic omni-directional antenna. FREQUENCY IN MHz. antennas that are more effective than ground-planes and whips. Brings you all the tools to tackle projects big and small - combining real-world components with online collaboration. Cross Field Antennas-- from GM3HAT & W5QJR Cross Field Antenna ConstructionBy G3YCC Cubical Quad Antenna Calculator-- From KD6DKS Cubical Quad Antenna Design-- from N6VNG Cubical Quadsfrom EI7BA. 34 dB over that of the preamp or 1. Delta Loops— from G3PTO Dipoles and Inverted Vees-- from W4RLD Dipole Dual DX Antenna - 20 and 15 meters from NB6Z Dipoles, Rotatable-- From KQ6RH. But if you have a 1/4 wave, 5/8th's wave, etc, you do want the ground plane under the vertical antenna. That antenna's current distribution is probably best described as a 3/2 wavelength wire with the usual alternating phase relationship but where the middle 1/2 wave has been inductively loaded so that it's physically small. A) The only difference between the two is that the TRA6927M3PWN-001 does not require a metallic ground plane. 6 element UHF Yagi antenna - QSL. The conductor width isn't of great importance in the design. net 6 element UHF Yagi antenna. The design software. e-mail-adress: dk7zb(at)darc. Practical VHF/UHF Antennas The Radio Communication Handbook 16. That being said, that would be the answer to the gain-loss as well, as you will lose. Another patented design principle applies to the Finco (Finney Co. However I highly recommend to follow my instructions , which are based on computer antenna simulation software 4nec2, to maximize performance. Half the side to side beamwidth, if you are concerned to determine the offset angle from the beam centre. For an good efficacity and directivity on radio spectrum it's necessary to use an YAGI antenna. Arrow Antenna is now offering FREE SHIPPING on orders over $100 and $5 Flat Rate Shipping for orders up to $100 to the lower 48, Flat Rate Shipping of $15 for all orders to Alaska and Hawaii and $30 for US Territories and APO. The calculator will calculate the length of the stub (L), and the distance (D) from the load (usually an antenna) where the stub shall be placed. · G4FGQ's Software G4FGQ's Software -- A collection of free engineering/modeling programs written by Reg Edwards G4FGQ. In the study of antennas, fractal antenna theory is a relatively new area. Nov 15, 2011 · Home-Made Magnetic Loop Antenna for 30 Meters. The radiating element is a quarter wave (λ/4) and the radials are 12% longer. In this paper, we present a wearable antenna design and process using genetic algorithm (GA) optimization. Extended Life VHF TV Broadcast Antennas: Also, very carefully chosen materials resulted in heavy duty galvanized / stainless steel radiating elements. This is typical of VHF and UHF arrays. "Digital" frequency range extends up to about 1000 MHz, which formerly was called "UHF". Cheap Yagi Antennas for VHF/UHF by Kent Britain, WA5VJB edited by John Maca, AB5SS [Editors notes: The antennas described in this article were built as the result of several discussions between Kent and a Cuban radio operator. The WR24-i is ideal for Industrial use. It takes care of every single movement during the tuning. Because best power transfer occurs when source impedance is same as antenna, and free space impedance is 377 Ohms so 75 Ohm antenna would give very poor results. · Yagi Antenna Design This site offers a free interactive design page to let hams design Yagi antennas for HF, VHF and UHF. Receives UHF, VHF and FM HD digital channels within a range of 25 miles and works with HD or analog TVs. The first of two designs uses wire radials for both the disk and the cone portion of the antenna. Made in the USA In the field and on the controlled test range the HD Stacker performs phenomenally well. VHF-UHF Portable Yagi-Uda Antenna Design 2 Meter Beam Antenna Dishes for Amateurs KA0Y's 50' Dish - It's a big one! Dual Band (2M/440 MHz) Walking Stick Antenna Antenna Page - VHF / UHF designs Home Brew dual band mobile antenna - A 1/4 wavelength resonator for both the UHF and VHF bands Antenna EiRP calculator Calculate Antenna & Cable losses. NEC Geeks to the Rescue. 7:1 at 146 MHz, indicating that the antenna is a bit long. Presented here is an experimental LPA for the Australian UHF broadcast TV bands IV and V. 058 inch thick walls. But at these frequencies “line of sight” does not simply mean that from one site you can “see” the other. to help capture and hold VHF broadcast signals. Alibaba offers 20 Embedded Antenna Design Suppliers, and Embedded Antenna Design Manufacturers, Distributors, Factories, Companies. frequency * Supplier updates * Author's blog * Additional photographs and schematics * Links to tutorials and specialized calculators Series: Practical Antenna Handbook Paperback: 784 pages. Helix Antenna with Match Calculator; J-Pole Antenna; Lambda/4 Groundplane Designer; Logarithmic Periodic Dipole Antenna Calculator; Microstrip Patch Antenna Calculator; Wokatenna Design; Yagi Uda Antenna Designer (NBS Tech. Yagi Calculator by John Drew, VK5DJ to develop DL6WU style yagis for VHF/UHF. Cheap Yagi Antennas for VHF/UHF by Kent Britain, WA5VJB edited by John Maca, AB5SS [Editors notes: The antennas described in this article were built as the result of several discussions between Kent and a Cuban radio operator. Doctoral thesis. Jumpa lagi teman-teman sobat CNC. It's capable of receiving both VHF and UHF signals from up to 70 miles away. Remember in our first example the impedance at the end of section "B" was 50 ohms. The minimalistic design and N connector also make it suitable for special gate applications such as train recognition on the railway track. Model # Band Element Phasing/ Wavelength Gain/dBi Watts Mount Length Inches; CR627B: 6m / 2m / 70cm : 1 1/4l, 3 1/4l, 3 5/8l: 2. VHF/UHF Mobile Vertical Antennas. All material used in this project are easily obtainable tubes and rods which is limited within a total budget of $18. Fresnel Zone Clearance and Antenna Height Calculator Radio Line-of-sight At UHF and microwave frequencies, when you deploy an RF link between two distant sites you need to make sure you have “line of sight” between the two antennas. com Our free YAGI UHF TV ANTENNA PLANS describe how to build a simple high gain YAGI antenna for reception of a single broadcast television channel ranging between 14 and 70 (470 - 812 MHz). The calculators for other antenna types such as parabolic,horn,dipole and patch are also mentioned. Elk Antennas was started to give the Ham the best Log Periodic antennas with the best gain, directivitiy, and front-to-back ratio possible for the size and price. Technological University. I have found this program easy to install. • Feeding the Antenna can be done at the Director or at the Reflector. Compares (way too small) U-Tube/MakeTV, an unknown 4-Bay, CM-4221, MClapp's Supersized M4 and EV's Kosmic SuperQuad antennas. HDL_ANT , is provided to do the necessary design calculations. Portable UHF 4 elements Yagi Antenna Posted on 05/04/2013 by Adrian Although I’m not a big fan of V/UHF, going over DK7ZB’s website I was impressed by his numerous Yagi antenna design and their good efficiency, and also, myself, eager to do some mechanical construction, I decided to try building this four elements Yagi for 430-440Mhz, to. JA-MS-BB – Broadband UHF Slot Antenna; JA-MS-JSM-JSH – B-band S/Mount UHF Slot Antenna; JSM-JSH – Side Mount UHF Slot Antenna; ProStar – UHF Slot Antenna; JA-SS – Super Slot Low to Med Power TV Antenna; JL-SS – Gap Filler Translator System; UHF TV Broadcast Panel Antennas. All you need to do is enter the desired resonant (center) frequency in the form below, then click "Calculate". What Hoverman could never have known is how the UHF channels shrank over the years from 14 – 83 to 14 to 51 yielding today’s 470 – 698 MHz. Delta Loops— from G3PTO Dipoles and Inverted Vees-- from W4RLD Dipole Dual DX Antenna - 20 and 15 meters from NB6Z Dipoles, Rotatable-- From KQ6RH. 17-Element Very High Frequency/Ultra High Frequency Log Period Dipole Array: The 17-element VHF/UHF LPA antenna was placed in service on 26 May 2010 (see pictures below) and removed from service 1 June 2011. I used and antenna calculator found below and the results for a quarter wave length at the bottom, middle & top of the 14 - 51 range are as follows. GLUE SHOULDER WASHER INSULATOR TOP WASHER DIA. UHF Ceramic Chip antennas features include supplier updates, and design how-tos. Ladder line antennas, how amateur radio antennas work, Eznec software and what it can do for you. ) antenna in Fig. 5 dB overall and a degradation of noise figure of an extra 0. On-line antenna designer. It has an embedded amplifier with Clear Circuit technology to give you the absolute best signal quality. We used again only 100W bare-foot setup so it was easy to compare with an old twins stacked on the tower last year. Half the side to side beamwidth, if you are concerned to determine the offset angle from the beam centre. The antenna calculator above uses this formula as a starting point to calculate wire lengths for the dipole. Hello All, I'm looking for some info on a 900MHz antenna that I found on a device. The length of a dipole is the main consideration for determining its operating frequency, and as a result, calculating the length is a key element of designing and installing any dipole antenna whether for HF, VHF, or UHF, etc. Choose the units of measurement, English or metric. However, fractal antennas and its superset fractal electrodynamics [Werner and Mittra, 1999] is a hotbed of research activity. 10 under Wine) to produce dimensions for a DL6WU style long Yagi antenna. It's a high-gain "Triple Boom" design. The net result is an increase in the level of the received signal. I used and antenna calculator found below and the results for a quarter wave length at the bottom, middle & top of the 14 - 51 range are as follows. WB3AYW uses this antenna in repeater operation. With a heritage in over-the-air antennas specifically tuned for core DTV frequencies, Antennas Direct has invested major resources into the discovery and implementation of. Currently, the BW is 40 MHz and I need it to be 100 MHz (S11 = -10 dB @ 2. Currently, the BW is 40 MHz and I need it to be 100 MHz (S11 = -10 dB @ 2. quagi antenna calculator. Our antennas are designed to provide the best gain figures, for the requirements of the band and for the specific application where the antenna will be used. 6,8 A terminating stub improves the front‑to‑back ratio at «weak spots» in the frequency domain. ference to other electronic equipment when the antenna is used for transmitting. Text: AN10906 NXP Semiconductors UHF RFID PCB Antenna Design 4. For UHF (Channels 14 - 51), you will receive crystal clear reception with any of our other antennas. Antenna Calculator Calculate your dipole, 3 element yagi etc. avr atmega 8 bit rate-baud rate calculator- isr vector names address This EXCEL file consist of various calculations involved in AVR (Atmega 8) MCU system design. The antenna works great for the 518 and 494 MHz stations! Thanks for your help!. Yagi Calculator is a program to assist with the design of long yagi antennas. The design of Octagonal-shaped microstrip patch antenna consist of antenna width (W), antenna length (L) and a feed line which have impedance of 50 ohm. (refer to Tips & Tricks section of this site for a simple method for soldering Aluminium braid of the cable) 3. 3 Published by LEDF Media. I used two pieces of 1x4". IS 1/4” FOR BRASS ROD ASSEMBLED CONE TAB AND OVERLAP SOLDER SEAM (INSIDE. While a higher gain means a stronger signal, when you increase the antenna's gain (i. This link is listed in our web site directory since Saturday Sep 17 2005, and till today "VHF/UHF Yagi Antenna Design" has been followed for a total of 145368 times. What Hoverman could never have known is how the UHF channels shrank over the years from 14 – 83 to 14 to 51 yielding today’s 470 – 698 MHz. Hey guys! I'm looking for a BNC antenna tuned to both the UHF-T (450-512) and 700/800 MHz bands for base station mounting. Typically, the pitch angle is taken as 13 degrees. Bowtie Antenna basics | Bowtie Antenna Calculator. So far received. An antenna's linear polarization is Phased array - A high gain antenna used at UHF and microwave frequencies which is "Microwave Antenna Design Calculator" Provides quick estimation of antenna size required for a given gain and frequency Read Article. Obviously of shorter. The antenna is fed by a low cost, low loss foam cable RG6. 25" EMT electrical conduit from a big box home improvement store for the pole. If you’re having trouble receiving one or two channels even though you’re close to your local broadcast towers, it may be because your antenna is not designed to pick up VHF frequencies. BROADBAND UHF ELEVATED FEED ANTENNA CD990 Series 400-520 MHz Based on the industry leading CD90 series antennas. Use this application to generate an antenna model based on your input. Mechanical Design. I have mostly used the transmitter and that is actually fairly OK with just a simple 1/4 lambda antenna, but is open for improvementThe receiver however is a bit c. The resource is currently listed in dxzone. ) antenna in Fig. Dish Antenna Design A dish antenna works the same way as a reflecting optical telescope. The world's favorite antenna book. This formula to obtain the length of a half-wave dipole antenna will give a good ballpark value to start with. His design only covered a part of UHF band. This calculator is designed to give the horizontal length of a particular dipole (including Tees) antenna, or one side of it, for the frequency chosen. The Wire Size can range from 16 AWG to 12 AWG. 11b Horn Antenna Designer: Antenna calculator Wi-Fi Antenna Extension Loss Calculator : Antenna calculator dipole antenna calculator, Yagi antenna calculator, Find the length of a dipole, 3 element yagi. Alibaba offers 20 Embedded Antenna Design Suppliers, and Embedded Antenna Design Manufacturers, Distributors, Factories, Companies. com is an archive of Rod/AC6V's webpages, and is no longer being updated. Since most HF antennas require elements of tapering size, a conversion method is required. net 6 element UHF Yagi antenna. gain design is the reason that array type antennas are more often used in the higher frequencies rather than a simple dipole. Here are constructional details of UHF Yagi beam antenna. This has been calculated based on the frequency entered - Frequency to Wavelength Calculator. by Michael Martens | Nov 3, 2013 | Antennas. Also called a "beam antenna", or "parasitic array", the Yagi is very widely used as a high-gain antenna on the HF, VHF and UHF bands. TV Broadcast Antennas. The antenna I constructed was made of 1/2" tubing. Applies to antenna far-field calculations using E (V/m). Tallysman Wireless - Calian Acquires GNSS Antenna Company, Tallysman for $24. Element Shapes and Spacing. 25" EMT electrical conduit from a big box home improvement store for the pole. Hardware design made easy. Figure-1 depicts typical Bowtie Antenna. NEC Geeks to the Rescue. JA-MS-BB – Broadband UHF Slot Antenna; JA-MS-JSM-JSH – B-band S/Mount UHF Slot Antenna; JSM-JSH – Side Mount UHF Slot Antenna; ProStar – UHF Slot Antenna; JA-SS – Super Slot Low to Med Power TV Antenna; JL-SS – Gap Filler Translator System; UHF TV Broadcast Panel Antennas. The 17-element LPA is model KMA144-500 by KMA Antennas (www. cone and disk would be. The software provides a datasheet with the required element lengths and positions, and further specs for the coax connection (balun). I used the VK5DJ Yagi Calculator to design a 518 MHz Yagi antenna with 8 directors. The calculator program available for download to design this antenna is in xls spread sheet format and requires that you have a program that will read xls spread sheet files. The article was titled Extremely Long Yagi Antennas. On the one hand, the resonant frequencies of UHF PD antennas are required to fall into a lower range between 300 MHz and 1000 MHz with a wide bandwidth [5]. FIND THE LENGTH OF A DIPOLE. The antenna used for broadcasting through the 1920s was the T-antenna, which consisted of two masts with a wire topload strung between them, requiring twice the construction costs and land area of a single mast. patented in the sixties. In 1924 Stuart Ballantine published two historic papers which led to the development of the single mast antenna. Again the equations are taken from the ARRL Antenna Book. Amplifying at the antenna is usually the way to go and then amplify again for the distribution. 70 cnts) pair of Tx/Rx modules. The 17-element LPA is model KMA144-500 by KMA Antennas (www. 85" Ch51 592 MHz 1/4 wave = 4. Offer is good for web orders only. 1: Length correction factor for half-wave dipole as a func-tion of diameter. scarc vhf/uhf j pole antenna This antenna provides continuous coverage of the 2 metre (144 – 148MHz) and 70cm (430 – 450MHz) bands and is an excellent choice for base station use. 15 ANNA UNIVERSITY CHENNAI : : CHENNAI – 600 025 AFFILIATED INSTITUTIONS B. For an good efficacity and directivity on radio spectrum it's necessary to use an YAGI antenna. This is typical of VHF and UHF arrays. Half the side to side beamwidth, if you are concerned to determine the offset angle from the beam centre. UHF Log-Periodic Array. This page covers Bowtie Antenna basics. Wipe those monthly subscription payments away with this HDTV antenna that maximizes your local broadcast TV experience with the use of UHF and VHF frequencies. Although this is a old book, its design ideas are very quick, easy and strong. The ClearStream 4MAX Indoor/Outdoor UHF/VHF HDTV antenna features quick-connect assembly and is scientifically proven to out-perform the competition for reliable, ultra-long-range HDTV reception. The most popular book on antennas ever written, widely known as "the antenna builder's bible," Joseph J. This is my simple implementation of the ARRL Antenna Book design equations for the axial-mode helical antenna. The main category is Antennas for VHF UHF bands that is about antennas for vhf and uhf radio bands. The measurements below are for building a simple Dipole Antenna. [3] [4] It has moderate to high gain which depends on the number of elements used, typically limited to about 20 dBi , [3] linear polarization , [3] unidirectional (end-fire) beam pattern [3] with high front-to. This is a standard 6 elements design scaled for UHF application. Tallysman Wireless - Calian Acquires GNSS Antenna Company, Tallysman for $24. I have found this program easy to install. The required operational frequency is in. An antenna with a wider beamwidth, such as a biquad, doesn't require the same precision for alignment, thus making it easier to get a link working. I used the VK5DJ Yagi Calculator to design a 518 MHz Yagi antenna with 8 directors. Also called a "beam antenna", or "parasitic array", the Yagi is very widely used as a high-gain antenna on the HF, VHF and UHF bands. The Wire Size can range from 16 AWG to 12 AWG. Yagi Calculator is a Windows program (also runs well on Linux - Ubuntu 8. Ladder line antennas, how amateur radio antennas work, Eznec software and what it can do for you. This page contain electronic circuits about Electronic UHF Circuits. One place the difference is not as easily detected is in mobile antenna design. I used and antenna calculator found below and the results for a quarter wave length at the bottom, middle & top of the 14 - 51 range are as follows. Enter the required frequency in MHz and the antenna designer will calculate the dimensions of the elements as shown below. The world's favorite antenna book. This can be reduced or eliminated by using a balun at the feed point. Use the Heading listed in the results below and a compass to aim your antenna towards the towers. ) 7031xxx: 2 Element Yagi Antenna: 50 - 250. ANTENNA DESIGN The concept of log-periodic wire-antennas is applied to microstrip printed technology, to get the antenna layout shown in Figure 1. Has anybody found a good tutorial/analysis of what needs to be done to make a resonant loop antenna for UHF or L-Band frequencies? I know that the thickness of the wire starts to have an effect, but it's usually merely mentioned and no real quantitative discussions happen as to how to modify the antenna design for wire thickness. For an good efficacity and directivity on radio spectrum it's necessary to use an YAGI antenna. This antenna is very adapted at VHF and UHF domain inside 30 MHZ to 900 MHZ. There are usually four radials, three being a minimum, but you could use up to six. Also called a "beam antenna", or "parasitic array", the Yagi is very widely used as a high-gain antenna on the HF, VHF and UHF bands. They span about 520 MHz to 820 MHz. — CONSTRUCTION PARTS DETAILS for a 700-2000-MHz UHF discone antenna. of the vertical taper, but it is a bit more difficult to design. They act as mere conductors tying the vhf antenna to the block where the lead-in fastens. When you build the match, use the same coaxial cable for the stub as used for the rest of the antenna system (or at least the same coaxial cable as used close to the antenna), then use a T-connector. Flat digital HDTV antenna with VHF and UHF frequency range is lightweight design with VHF, UHF broadcast, 5 dBi gain, 75 ohm impedance and linear polarization. Dipole antenna. Check our range Telecommunications range incorporating Mobile Phone Accessories, CB Radios, UHF Radio, Phone Accessories, and Radio Scanners all at low prices. It has an embedded amplifier with Clear Circuit technology to give you the absolute best signal quality. Dipole Antenna Calculator. Design background. I used two pieces of 1x4". I picked this design and used 1. double the length given by Cebik 6 and this calculator. 5" Boom Length 79. In the second design I decided to use a. The antenna is based on design by ON6MU. The above formula is to calculate the gain of a parabolic dish antenna where: D = The Diameter of the Dish. An Antenna is an essential terminal device in all forms of communication and radar systems. Fairview Microwave's new line of waveguide antennas are designed for wireless communication in test and measurement, R&D, and military/aerospace applications between 40 GHz and 220 GHz bands. with the electromagnetic vibration’s nature. This is my simple implementation of the ARRL Antenna Book design equations for the axial-mode helical antenna. On my website I offer both J-Pole and Slim Jim antennas in VHF and UHF configurations. Circuit simulation made easy. An antenna analysis program. ie/engdoc Part of the Electrical and Computer Engineering Commons Recommended Citation Loutridis, A. Delta Loops— from G3PTO Dipoles and Inverted Vees-- from W4RLD Dipole Dual DX Antenna - 20 and 15 meters from NB6Z Dipoles, Rotatable-- From KQ6RH. Detecting si. This page covers Bowtie Antenna basics. Antenna design calculators category is a curation of 84 web resources on , Parallel Square Conductor Transmission Line Calculator, Magnetic Loop Excel sheet, Analysis Of Antenna Mast Strength and Bending Stress. In the research journals, we see reports of active research covering such diverse areas (of fractal electrodynamics) as the study of scattering from. The physical design of the antenna is entered (such as the lengths of wires and elements). For a given frequency, the feedpoint impedance is calculated, along with theoretical. 4 cm, 868 MHz: 8. Larger C/Λ tightens the radiation pattern at the expense of circularity. Their low profile design, often square or rectangular, allows them to be mounted to flat surfaces. But at these frequencies “line of sight” does not simply mean that from one site you can “see” the other. This transmission includes light emissions traveling in a straight line. com works in canada. · G4FGQ's Software G4FGQ's Software -- A collection of free engineering/modeling programs written by Reg Edwards G4FGQ. LN WN Sn Sn+1 LF x y o a Figure 1. The 300-75 UHF balun at the antenna is a loss. Microstrip Patch Antennas (or simply patch antenna) are increasingly useful because the antenna is printed directly onto a circuit board. For UHF (Channels 14 - 51), you will receive crystal clear reception with any of our other antennas. Ladder line antennas, how amateur radio antennas work, Eznec software and what it can do for you. · Yagi Antenna Design This site offers a free interactive design page to let hams design Yagi antennas for HF, VHF and UHF. I also used the calculator to design. Usable with all available UHF readers. Maximum Width 15" Net. TO FIN INSIDE OUTER TUBE I. I picked this design and used 1. Q) I would like to know the difference between TRA6927M3PW-001 and TRA6927M3PWN-001, which makes the gains so much different. Salient Features: We manufacture Circular Polarized Quadrifilar Helix Antenna for 137 MHz and 380-430 MHz frequency band. NEC Geeks to the Rescue. This transmission includes light emissions traveling in a straight line. The dimension limits are enforced to ensure axial-mode radiation. In the research journals, we see reports of active research covering such diverse areas (of fractal electrodynamics) as the study of scattering from. Log periodic antennas, by design, are wide band antennas so it's fairly safe to assume that this antenna will cover the entire UHF band from 14 to 69 and probably a little more. Antenna gain. This post will show two variants of this antenna that can be used to receive 170 to 230 MHz channels (5 - 12) and a part of UHF between 470 - 720 MHz (21 - 52. The array dipoles are fed (in an alternate way) with two microstrip lines printed on the opposite sides of a dielectric slab (as in Figure 2(a)). WB3AYW uses this antenna in repeater operation. Helical Antenna Design Calculator. This formula to obtain the length of a half-wave dipole antenna will give a good ballpark value to start with. But at these frequencies “line of sight” does not simply mean that from one site you can “see” the other. All you need to do is enter the desired resonant (center) frequency in the form below, then click "Calculate". A yagi type antenna, on the other hand, ( such as your VHF or UHF TV antenna) focuses the energy in a single direction, as would a torch. The antenna calculator above uses this formula as a starting point to calculate wire lengths for the dipole. Arrow Antenna is now offering FREE SHIPPING on orders over $100 and $5 Flat Rate Shipping for orders up to $100 to the lower 48, Flat Rate Shipping of $15 for all orders to Alaska and Hawaii and $30 for US Territories and APO. An antenna made from a solid disk and cone could weigh several pounds and would offer a considerable wind resistance. The word “turnstile” actually refers to two different ideas. Q) I would like to know the difference between TRA6927M3PW-001 and TRA6927M3PWN-001, which makes the gains so much different. An Antenna is an essential terminal device in all forms of communication and radar systems. The company (or at least the antenna division) was sold to Wade. Jumpa lagi teman-teman sobat CNC. VHF/UHF Beam Antennas. 700 amateur radio topics - 6,000 links & 133 pages - from antennas to zones NOTE: AC6V. Helical antennas invented by John Kraus give a circular polarized wave. However, fractal antennas and its superset fractal electrodynamics [Werner and Mittra, 1999] is a hotbed of research activity. It is a omnidirectional antenna which has the same gain in every direction. Where separation of UHF and VHF antennas are not possible, UHF and VHF stacked antennas are recommended as shown in the following figure. The conductor width isn't of great importance in the design. The 17-element LPA is model KMA144-500 by KMA Antennas (www. In most areas, it must also be well. This design also provides a stable and strong mount that will withstand strong winds, ice and snow. Practical VHF/UHF Antennas The Radio Communication Handbook 16. avr atmega 8 bit rate-baud rate calculator- isr vector names address This EXCEL file consist of various calculations involved in AVR (Atmega 8) MCU system design. Lambda = The wavelength of the Antenna in meters. The software provides a datasheet with the required element lengths and positions, and further specs for the coax connection (balun). C 8842A • UHF Wireless Mic System Antenna Booster – BNC. The Tiny 2+1 Renamed the Tiny 3. 11b Horn Antenna Designer: Antenna calculator Wi-Fi Antenna Extension Loss Calculator : Antenna calculator dipole antenna calculator, Yagi antenna calculator, Find the length of a dipole, 3 element yagi. Text: AN10906 NXP Semiconductors UHF RFID PCB Antenna Design 4. There are several kinds of antennas designed for UHF PD detection in [29][30][31][32]. Jessop (G6JP) Third Edition printed by RSGP in 1977. They are one of the easiest to design. antennas that are more effective than ground-planes and whips. position satellite antennas for VHF and UHF have used a version of the turnstile. 5 Million - Sep 04, 2020 Keysight Technologies - Chinese Electronics Company Selects Keysight's Test Solutions to Evaluate their 5G Smartphones - Sep 04, 2020. This paper presents the design and implementation of dual-stacked identical Yagi antenna. But then the elements are made of 1mm stranded copper wire. Figure 2: Optimized design 1 of Yagi Uda Antenna From antenna parameter of this designed as shown in table 3 we concluded that power radiated by five elements Yagi-Uda antenna is 0. They span about 520 MHz to 820 MHz. 5mm) instead of 15mm. ) 7031xxx: 2 Element Yagi Antenna: 50 - 250. This antenna is horizontally polarized and should be mounted as high as possible but works well at low heights of 10-30 feet. kmaantennas. at category uhf circuit : RF CircuitsCircuits and Schematics at Next. Anyone find a link please let me know where so I can compare results. If you have a shortwave or high-frequency receiver or scanner that is struggling to capture signals with a short, whip antenna, and you’d like the kind of performance that a 60-foot ‘longwire’ antenna can provide but lack the space to put one up, consider building the AA-7 HF/VHF/UHF Active Antenna described in this article. However, with some improvements, the antenna can receive well both the UHF as well as VHF-Hi. The net result is an increase in the level of the received signal. The GMRS J-Pole is tuned for maximum performance on the 462 - 467 MHz General Mobile Radio Service and UHF public safety band. avr atmega 8 bit rate-baud rate calculator- isr vector names address This EXCEL file consist of various calculations involved in AVR (Atmega 8) MCU system design. ference to other electronic equipment when the antenna is used for transmitting. In addition, the input impedance is primarly real and can be approximated in Ohms by: The helix antenna functions well for pitch angles between 12 and 14 degrees. THE TOTAL LENGTH OF YOUR DIPOLE IS:. Their low profile design, often square or rectangular, allows them to be mounted to flat surfaces. If you are not satisfied with them, return to get your money back!. A yagi type antenna, on the other hand, ( such as your VHF or UHF TV antenna) focuses the energy in a single direction, as would a torch. Because best power transfer occurs when source impedance is same as antenna, and free space impedance is 377 Ohms so 75 Ohm antenna would give very poor results. Two criteria have to be considered for design of UHF antennas detecting PD in transformer [14]. I suspect that 8 dBi is probably more correct, but even 8 dBi will mean that 100 Watts in will behave like 630 Watts in the direction the yagi is aimed. Lambda = The wavelength of the Antenna in meters. Circuit simulation made easy. New Product Announcement: Arrow Antennas is now shipping Kerberos SDR Antennas!!!. 70 cnts) pair of Tx/Rx modules. Figure-1 depicts typical Bowtie Antenna. 1 First estimate of elements of Yagi. It's a high-gain "Triple Boom" design. antennas that are more effective than ground-planes and whips. Posts about antenna written by fahriemje2012. AN10906 NXP Semiconductors UHF RFID PCB Antenna Design Revision history Rev Date , Semiconductors UHF RFID PCB Antenna Design 1. This page contain electronic circuits about Electronic UHF Circuits. The Winegard Elite 7550 Long-Range Outdoor HDTV Antenna receives free HD channels. The world's favorite antenna book. Patch (microstrip) and slot antennas used at microwave frequencies are also dipole. This antenna is very adapted at VHF and UHF domain inside 30 MHZ to 900 MHZ. 3/4” TO 1” WITH HOLE TO PASS #6 SCREW BOTTOM WASHER O. Brings you all the tools to tackle projects big and small - combining real-world components with online collaboration. Design background. IS 1/4” FOR BRASS ROD ASSEMBLED CONE TAB AND OVERLAP SOLDER SEAM (INSIDE. Features: Circular Polarization for optimized reading performance. This design goal was achieved in the Pennyloop by having a second loop installed on the original feed point. LN WN Sn Sn+1 LF x y o a Figure 1. ANTENNA DESIGN 140 -150 MHZ VHF TRANSCEIVERS Online Edition ELPIDIO LATORILLA LEDF Media. The resource is currently listed in dxzone. Usable with all available UHF readers. The dimension of the antenna below is in function of the frequency. In this paper, we present a wearable antenna design and process using genetic algorithm (GA) optimization. When a ray of light reflects. TO FIN INSIDE OUTER TUBE I. The antenna best suited for your location that truly receives both VHF and UHF signals is the EZ HD antenna. 10 under Wine) to produce dimensions for a DL6WU style long Yagi antenna. Brings you all the tools to tackle projects big and small - combining real-world components with online collaboration. Antennas • The antenna is VERY important if long range is important • A quarter wave antenna is an easy and good solution, but it is not small (433 MHz: 16. The above formula is to calculate the gain of a parabolic dish antenna where: D = The Diameter of the Dish. Cheap Yagi Antennas for VHF/UHF by Kent Britain, WA5VJB edited by John Maca, AB5SS [Editors notes: The antennas described in this article were built as the result of several discussions between Kent and a Cuban radio operator. The Trimble Juno T41 offers enhanced GPS with 1-2 meter accuracy, IP68 rating, a fast 1D/2D barcode imager, UHF RFID and superior connection under heavy canopy, all in a slim, ergonomic design. This can be reduced or eliminated by using a balun at the feed point. Now, just add another antenna array identical to this with a TEE connector. In other words his original antenna was unable to cover the entire UHF band. shortwave) band. Even at the VHF and UHF frequencies, the antenna of choice is the vertically mounted mobile antenna. This design also provides a stable and strong mount that will withstand strong winds, ice and snow. Order Practical Antenna Handbook with CD ROM By Joseph J. Yagi Calculator is a program to assist with the design of long yagi antennas. The dual stacked antenna configuration should comply with the minimum vertical antenna isolation requirement of 30dB. Cheap Yagi Antennas for VHF/UHF by Kent Britain, WA5VJB edited by John Maca, AB5SS [Editors notes: The antennas described in this article were built as the result of several discussions between Kent and a Cuban radio operator. It has an embedded amplifier with Clear Circuit technology to give you the absolute best signal quality. Helix Antenna with Match Calculator; J-Pole Antenna; Lambda/4 Groundplane Designer; Logarithmic Periodic Dipole Antenna Calculator; Microstrip Patch Antenna Calculator; Wokatenna Design; Yagi Uda Antenna Designer (NBS Tech. From many popular antenna design web sites, we can see most people using the standard formula, 585/f (178. Maximum Width 15" Net. This page covers Bowtie Antenna basics. The Super J-Pole Antenna(Collinear Design) Below is a Javascript for calculating the lengths of tubing to be used for the construction of a Super J-Pole. This is a fantastic antenna, but that just seems like far too much to believe. (refer to Tips & Tricks section of this site for a simple method for soldering Aluminium braid of the cable) 3. 5dB and the second one is 0dB. position satellite antennas for VHF and UHF have used a version of the turnstile. LRU1002-FCC UHF Long Range Reader. The antennas are thus geared to the requirements of serious VHF amateurs who need a high-performance antenna for long-range traffic and all operating modes. Portable UHF 4 elements Yagi Antenna Posted on 05/04/2013 by Adrian Although I’m not a big fan of V/UHF, going over DK7ZB’s website I was impressed by his numerous Yagi antenna design and their good efficiency, and also, myself, eager to do some mechanical construction, I decided to try building this four elements Yagi for 430-440Mhz, to. A while ago I upgraded my TV antenna in preparation for Digital Switch-Over here in the UK. The 17-element LPA is model KMA144-500 by KMA Antennas (www. When you build the match, use the same coaxial cable for the stub as used for the rest of the antenna system (or at least the same coaxial cable as used close to the antenna), then use a T-connector. Although this is a old book, its design ideas are very quick, easy and strong. Parallel two 50 ohms and get 25 ohms. My entire antenna is 1/9th oversize - element spacing, wisker length, everything - plus I made all errors to the large side, to reduce peak gain back closer to the 14-52 UHF channel range. 10 under Wine) to produce dimensions for a DL6WU style long Yagi antenna. 4-3-2-001 Antenna Placement Guideline V1. 54 cm shorter. UHF bowtie TV antennas and PCB meanderline antennas used in some wireless devices are dipole variations. But you will be close. The 300-75 UHF balun at the antenna is a loss. The antenna gain shown in top line of the results is the on-axis gain. It mentions Bowtie Antenna Calculator and mentions formula or equations used for Bowtie antenna calculations. Flat digital HDTV antenna with VHF and UHF frequency range is lightweight design with VHF, UHF broadcast, 5 dBi gain, 75 ohm impedance and linear polarization. The AP546 digital TV antenna takes a new step in design for digital indoor TV antennas. In the picture notice the longer elements (rods) protruding from the EZ HD antenna boom? There are four of them on each side spaced and cut to length to receive the VHF frequency wave pattern. 15 ANNA UNIVERSITY CHENNAI : : CHENNAI – 600 025 AFFILIATED INSTITUTIONS B. We offer the top names in Ham Radio antennas, including Comet Antennas, Diamond Antenna, Larsen Antennas, MFJ, and Hustler Antenna. VHF / UHF Direct Connect Beams. Evans (G3RPE) and G. This antennas dipoles fully extend to 39 in. ) Horizontal Beamwidth (Deg. 05" If these lengths are correct would these new clone uhf tv antennas. This website gives you expected stations and levels that you can expect. An antenna analysis program. Hey guys! I'm looking for a BNC antenna tuned to both the UHF-T (450-512) and 700/800 MHz bands for base station mounting. Bowtie Antenna basics | Bowtie Antenna Calculator. This transmission includes light emissions traveling in a straight line. ) within a radius of about 10000 km or even more if the propagation is very good (during the maximum of the solar cycle), this design is not as efficient as an rotatble Yagi antenna cut at the working wavelength. Jumpa lagi teman-teman sobat CNC. A UHF antenna is an antenna (with a rake or other) for capture including TNT and TV analog SECAM or PAL, into the channels of the band IV and V or 21 to 69, in the spectrum ranging from 470 to 860 MHz which corresponds to a wavelength range between 0. The word “turnstile” actually refers to two different ideas. UHF 4-Bay Bowties - NO Reflectors 4-Bay Bowtie Antennas (If NO Reflectors and Flat Bowties) analyzed for VHF and UHF performance using 4nec2. POPtronix Discone VHF-UHF Antenna www. Features: Circular Polarization for optimized reading performance. I suppose, I am surprised that you were able to space the elements and cut them to thier proper dimensions but yet, these antenna plans you followed did not include any feed point impedance and matching network construction design information? I find that very unusual. The antenna calculator above uses this formula as a starting point to calculate wire lengths for the dipole. Use our simple calculator to determine approximate dimensions of materials needed to build a 3-element Yagi/Uda antenna, and then shop for your needs on our other pages and select from our inventory of aluminum, fiberglass, coax, connectors, and other parts and accessories for amateur radio and other radio applications. This is a standard 6 elements design scaled for UHF application. Navigation is also easy and the menu bar features exactly the options needed for the tasks required to develop yagi antennas. Brings you all the tools to tackle projects big and small - combining real-world components with online collaboration. Check our range Telecommunications range incorporating Mobile Phone Accessories, CB Radios, UHF Radio, Phone Accessories, and Radio Scanners all at low prices. Thereafter I finally began considering what kind of VHF/UHF station antennas I should build for my QTH. ANTENNA DESIGN The concept of log-periodic wire-antennas is applied to microstrip printed technology, to get the antenna layout shown in Figure 1. · Yagi Antenna Design This site offers a free interactive design page to let hams design Yagi antennas for HF, VHF and UHF. Connects via RG58 or RG213 low loss 50Ω coaxial cable and provides 9dB of gain allowing antennas to be mounted 10-50m from the receiver. This antenna project provides good performance because you build it exactly for the single TV channel or frequency you want to receive. We offer the top names in Ham Radio antennas, including Comet Antennas, Diamond Antenna, Larsen Antennas, MFJ, and Hustler Antenna. The most popular book on antennas ever written, widely known as "the antenna builder's bible," Joseph J. The minimalistic design and N connector also make it suitable for special gate applications such as train recognition on the railway track. Element dimension in inch unless otherwise specified. Wire Antenna Calculator. A) The only difference between the two is that the TRA6927M3PWN-001 does not require a metallic ground plane. There are several kinds of antennas designed for UHF PD detection in [29][30][31][32]. Partitioning Antennas •FT 817 and similar rigs have 2 antenna connectors; set up as 6M on one and 144/432 on the other –Makes sense to have two antennas, one on 6M and one for 432/144 MHz –Moxon on 6M, DK7ZB on 432/144 MHz •With single band rigs, or rigs with antenna connectors for each band, single band antennas make more sense. There are at least two good methods for constructing a Helical antenna the first of which is documented in VHF-UHF Manual D. 6 element UHF Yagi antenna. The antenna did not need to be excessively tall, but needed some additional height to cover each of the signal layers at the same time. His design only covered a part of UHF band. The calculator program available for download to design this antenna is in xls spread sheet format and requires that you have a program that will read xls spread sheet files. 7:1 at 146 MHz, indicating that the antenna is a bit long. This paper presents the design and implementation of dual-stacked identical Yagi antenna. 5dB and the second one is 0dB. its dBi), you reduce the angle it receives signal - this means that high gain antennas are more suited to flatter areas, and moderate gain antennas (such as 5-6dBi. The physical design of the antenna is entered (such as the lengths of wires and elements). Here we calculate the half wave length of the matching section of the 4:1 coax balun. However I highly recommend to follow my instructions , which are based on computer antenna simulation software 4nec2, to maximize performance. If this type of antenna is able of capturing any type of signal (from broadcast stations, amateur, military, civilian services, etc. Now Hoverman’s antenna design almost covers the current UHF frequency range… but not quite. 2 Design and Optimization of antenna The fundamental antenna design parameters that width, front-to-back ratio, beam width, return loss, radiation pattern, input impedance and directivity10.