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70cm antenna


70cm antenna • For best results make sure that the shorted part of the quarter-wave feed section is above the support. (2m) crossed satellite antenna 15 50MHz ­ DX News 29 RRFF SSnniiffer 21 9 tips fpr 2m Antenna Dopt = 12. The ring gasket makes the antenna water-proof, and The 2M 70cm base antenna is one of the most well known ones. 1 so perfect! The antenna attaches via a short piece of 6mm copper tubing with an M5 thread down the centre. The Dual Band version of the Slim Jim antenna met my requirements as set out at the beginning of the project. 1 so perfect! Build A 9dB, 70cm Collinear Antenna 70cm, Collinear Antenna From Coax 440 Mhz J-Pole Antenna plans Here is a 70cm (440 Mhz) J-Pole antenna that is inexpensive, and easy to build. The thick NMO mount and bracket all worked fine, but the coax cable isn't long enough to run all the way up through the dash and to the windshield where the scanner is mounted. Homemade vertical dipole for HAM 2 meter and 7 I'm confident you will find this portable "J" to far exceed any other antenna, in the same setup, to more than tripling your 2m & 70cm (440MHz) performance! Here is a step-by-step to make a portable (or base) 3/4 inch copper-pipe "J" that breaks down into four (~24" long) pieces for easy transporting. 5 dBd on 70cm bands and it is fed via single 50 Ohm cable (use as short as possible for comfortable operation) All elements made from aluminium welding 3. When we mass produced this antenna as a club project, we marked the pipe and used a portable jig saw to cut the lengths in assembly line fashion. Compact and effective 2m/70cm dual band antenna for satellite operation Building the UHF Cheap Yagi for Satellite Communication Station After browsing the various Internet antenna construction sites in search for the best portable satellite antenna for the V/U and U/V modes, I figured I could build something good. This does NOT take into consideration the type or size of horizontal reflectors, of even if there is a need for them. The goal here is to put up a cheap, easy, and quick 2-meter antenna that is simple and unobtrusive, but works quite well. The antenna itself uses 12" of the boom length and I left 5" at the rear for the "handle" and 1" at the front to attach a PVC cap--gives it that finished look. Just like the two meter version, there are no moving parts and all materials can be easily obtained at a hardware store. Before you start constructing your own LPDA using the LPDA calculator below, please read chapter 10 of the 20th Edition of the ARRL Antenna Book (Other editions of the ARRL Antenna Book work as well, but may Homebrew Satellite Antenna (created 16 September 2003) The Arrow Antenna is a design classic: it combines light weight, compact design and functionality in a single package for operating FM dual band satellites such as AO-27, UO-14, SO-41 and SO-50 (and I've had lots of success on the linear transponder birds too with this antenna). Mount the antenna to a pole making sure to clamp the antenna to the mast at a point below the decoupling sleeve area. this is the best dual band j-pole ever built 2m - 70cm direct connection beam dimenisions The Cubical Quad or Quad antenna has traditionally not been as widely used as its more popular cousin the Yagi. 2 Elements Yagi build for 107Mhz FM Band; Build the 5 Elements 2m VHF Yagi; Build a 4 elements yagi 157. 2m 70cm dual band antenna 144 432 mhz yagi 2 meter quad antenna yagi antenna design basics learn more about a beam vhf uhf beam and yagi antennas at dx ering sandpiper 2m 3 element beam antenna 5dbd. this antenna can be tune just open and make 1/3 of a cut to each rod to the resonate freq it works fine 1. ), years ago and then later with a discone  Diamond antennas make great vertical antenna for 2m/70cm/6m, high gain antennas made from the best materials made to last and the market leader in ham  18 Feb 2016 In all cases the customer is responsible for the proper function of the antenna. Aug 13, 2010 · An example: a 2m J-Pole antenna can be tuned to the 70cm band (in other words it can have an SWR approaching 1:1), but the angle of attack (radiation pattern) of such an antenna is so bad that it They are end fed coaxial dipoles with an interesting design to make them dual band and colinear for increased gain. VHF and UHF Antenna Systems 18-21 Fig23—These drawings illustrate the dimensions for the 144-MHz ground-plane antenna. Editors Note - Here is a very easy to build dual band (2 meter/440) vertical ground plane antenna that may end up as your primary antenna for dual band operation or for emergency use. 2×4 2m/70cm Compact Satt Comm Antenna; 2×3 2m/70cm Cross Yagi – compact build; Build 3 x 5 2m/70cm Cross Yagi 145-435Mhz; Build the 3 x 5 Elements 2m/70cm Yagi; VHF antenna’s. To make this measurement, the dipole receiving the signal sent by the “Eggbeater” antenna was also tilted at an angle of 45 degrees. This easy to build dual band VHF/ UHF antenna makes a great project for the new ham that is ready to get on the  VHF - UHF BAND PLAN CHAT. The pattern will be On the other hand, by switching to REFlected, an antenna can be tuned by simply finding the minimum reading. It is also an ideal low-cost ham radio club j-pole antenna super j-pole antenna cubic quad antenna arrow antennas dual band j-pole note: this antenna was disigned by arrow antennas and it works great. Elk Antennas produce a 2M/440L5 Dual-Band Antenna which is a periodic antenna Buy one Build his home made antenna is great ! You can find articles bellow : Tune in to space with a homemade yagi antenna. The design is based on an article which originally appeared in CQ magazine (1987), and a version of this design is produced by Arrow Antennas of the USA (not available in Australia). At a local club meeting I leamed that there are several com Copper-pipe J Antenna by N6JSX 08/2013 This is my revised BASE 2m/70cm Copper-Pipe J, a how-to DIY with an optional method to make a PORTABLE dual-band J for hotel travelers, restricted apartment dwellers, or for limited balcony/patio use SMA Male Antenna Dual Band 2m/70cm Whip Compare COMET GP-1 Base antenna, 2m/70cm, 4ft prices and reviews at Searchub. But what about all the metal in the TV dish? Wouldn’t that compromise a 2 meter antenna? Finally it struck me, don’t fight the metal; take advantage of it. Length is measured from connector tip to connector tip with the 'T' connector in place (see below). I was playing around with the MMANA Antenna analysis software and wanted to design a 2m/70cm vertical antenna. Your browser does not currently recognize  20 Feb 2014 Easy to build ham radio dual band 2 meter and 70 centimeter ground plane antenna. The ground plane can be formed by a disc, a number of horizontal radials, a number of slanting radials, or a food/drink can. Tape Measure Yagis (so named because the elements are made from a metal measuring tape) have become very popular in the last few years, especially for RDF and EMCOM work, because they're simple to make, inexpensive, lightweight, portable, and easily stored. 00 Diamond Antenna NR770HNMO Dualband 2m/70cm Mobile Antenna with NMO Connector and Fold Over Hinge, 40" Tall, Silver 5 out of 5 stars 1 10W Micro-Diplexer for 2m / 70cm. The radiation pattern on 70 cm will be similar to 3 1/2 wave collinear array and will have around 3 dBd gain. This will direct more of your output power when transmitting, while at the same time reducing interference and increasing signal strength when receiving. If you need more range when stationary on a public service event you can remove the antenna, connect a coax to the antenna mount and run it to a higher gain stationary antenna. Arrow Antenna 1-307-638-2369 Fully assembled and tested Micro-Duplexers and Dual band Yagis ----- end of original article ----- If you would like to purchase parts to build the duplexer, you can get the capacitors and inductors using the following Digikey part numbers: Panasonic SMT Capacitors: PCC2R7CCT-ND 2. The 2m/70cm antenna kit (design : DK7ZB) was provided via NuxCom in Germany (great quality and service from Nuxcom, so I can strongly recommend them to you). Nov 26, 2017 · The antenna described here is a direct-connect dual-rectangle beam for use on 70 cm between 440 and 450 MHz. each antenna individually tuned to 146MHz and 446MHz for 2m and 70cm  Results 1 - 48 of 387 Workman UV-324 2m / 70cm Ham Radio Antenna NMO Base. The boom material typically is wood, 1/2" by 3/4" sold in home centers as "flat pine molding". DX Engineering wound up sending me an entire extra antenna, with instructions to try and build a good antenna and send the excess parts back on their dime. 0 to 1 is acceptable and often one uses an antenna tuner to then match the transmitter to the antenna & feedline. Indicator Calibrated Step Attenuator Remote Antenna Antenna Under Test Standard Talkie in As I was also looking for a more effective vertical aerial for mobile on 4M and this looked very simple to build, this is what I did. you need a SMA-FEMALE to PL-259  5 Mar 2020 Find the best mobile antenna for PMR446 and 2m/70cm Ham Radio. 8 hours ago · Build your own 2m/70cm 3 Elements VHF by 5 Elements UHF Yagi antenna with excellent gain for both VHF and UHF operation. Taping the thread forced the lower part of the tubing to be just a little bigger than 6mm and formed quite a good thread inside the tubing. n9tax DBJ-2 dual band roll up antenna - available in HAM (144-148 MHz and 440-450 MHz) or Commercial (152-157 MHz and 460-470 MHz) includes 6ft extension, BNC, SMA and SMA female adapter $28 TBJ-1 triband base antenna 2mt/220 MHz/70 cm –- $60 - includes shipping with 6ft of pvc pipe. Info only for twinband antenna kits 2m/70cm: The 70cm element which is near the radiator, is the so called open-sleeve-element, and can be used to tune the SWR on 70cm. Decide where you want to mount the antenna and then wash and dry the window well, both inside and outside. Welcome to the G6OHM Website - Antenna Designs - Amateur Radio,Projects,Antenna Designs, Double Quad Beam,2m & 70cm SSB, Ham Satellites,Card Making, Recipes,BNOS,Flowerpot Antenna, Angela's Page,EXPMR Radio,Raised Bed Gardeningsion,Fusion Radio. Jul 06, 2012 · · Tri-Band 6m, 2m, 70cm Yagi Antenna Built from Old TV Antenna - How to build a ham radio 6 meter, 2 meter and 70 cm tri-band yagi antenna using You'll find more plans and free yagi antenna design software on the internet. Sep 25, 2012 · After getting it up on the rotator at work, I tested it with my recently purchased MFJ-269 Antenna Analyzer. However the cubical quad beam antenna is able to provide some advantages in a number of circumstances. Requiring a new 2 metre band antenna for local FM simplex and repeater communication and after evaluated a couple of the main contenders for the project I settled on the 5λ/8 wave ground plane to be designed for approximately 146. Mar 28, 2018 · With a 50 foot length of RG8, and the antenna 20 feet in the air, SWR was a respectable 1. 5 years passed since I made that antenna but I still don't have the idea how to make  3 Dec 2003 You can easily make a better antenna than that, a combination 2m ground plane/ 70cm J-pole, with the same construction technique and  Just 1. Vertical Antenna Chart & Index: Diamond: V2000A Vertical 6m/2m/70cm: X 30A Vertical 2m/70cm: X 50A Vertical 2m/70cm: X 200A Vertical 2m/70cm: X 300A Vertical 2m/70cm: Gap: Eagle DX HF Vertical 40/20/17/15/12/10 Meters : Mounts Tilt Ladder Mount: Hustler: 4BTV/5BTV HF Verticals: G3-144 Vertical 2 Meter : MFJ: MFJ-1625 Window/Balcony Antenna 80-6 2. A Simple 2 m/70 cm Vertical Dipole Antenna This easy to build dual band Diamond antennas make great vertical antenna for 2m/70cm/6m, high gain  A simple dual-band 2m/70cm antenna that is easy to make, does not require We have made the FBK antenna and have tested it for impedance match and  Results 1 - 16 of 250 0 out of 5 stars 1You can actually make a good 2m/70cm antenna that way by using a 2 m dipole and a close spaced 70 cm 1/2 wave . Typically the discone is likely to be used with a scanner, so it is best to make sure the antenna covers the frequencies of interest. NOTE: THIS ANTENNA WAS DISIGNED BY ARROW ANTENNAS AND IT WORKS GREAT  I was pleased to have the opportunity to review the Moonraker YG27 dual-band antenna, Fig. For the 2m & 70cm version, use 148 & 432, Fc = 253Mhz, to split between 148 & 432Mhz Jul 09, 2020 · @mmckenna @prcguy So I got the COMPACTenna installed today. I can leave it out and just pass it through the middle of Also, for very little more money, if one doesn't like the possible directivity of this antenna, one could simply build two of them, one for 2m and one for 440. ) The Cubical Quad or Quad antenna has traditionally not been as widely used as its more popular cousin the Yagi. Mar 10, 2015 · The non optimized antenna can be replaced by a DIY antenna which has a ¼ wavelength vertical whip connected to core of coax cable, and a ground plane connected to shield of coax. Quarter Wave Dual Band VHF/UHF Ham Radio Antenna: A Simple & Cheap Dual band antenna will save you having two different antennas for UHF and VHF We have Just Black available in… 15 Aug 2019 Got the next 2 days off so time to build it before hand but not a lot of money to spend on this. They are easy to build, especially for the UHF bands as you can simply use a SO-239 or N-Type chassis mount. I've found a few examples based on his design I intend to build so put them here to remind me and hopefully help others. Of course, to use the same thing for 70cm, or any other frequency over 2m, all I have to do is screw on another piece of tubing. All elements are aluminium tubes 10 x 1 mm except the driven element, that's a 12 x 1mm aluminium tube. If you suffer with noise from living in the city, or want the perfect quite EME single antenna or array, this is another low-noise example from G0KSC Most antenna modeling programs have extensive libraries of standard antenna designs to choose from, so #1 above is not so bad. We perform  19 Nov 2018 This antenna is designed for amateur band frequency for both VHF (2m) and UHF (70cm). Here’s a small 2m / 70cm diplexer that is good for up to 10W of power, perfect for working satellites with a HT. With a little more weatherproofing, it will make a fine dual-band base station antenna of moderate gain (2. Jul 11, 2015 · The J-pole antenna, also called the Zepp' antenna (short for Zeppelin), was first invented by the Germans for use in their lighter-than-air balloons. Trailed behind the airship, it consisted of a single element, one half wavelength long radiator with a quarter wave parallel feedline tuning stub. 47 feet This is good, but there may be one more adjustment to make Antenna poles build make diy Copper Pipe J- Pole Antennas A copper pipe J- Pole antenna is a single band antenna that is much like a half wave dipole in that it is relatively easy to build , and when you are done you. The capture area of a 6 wire cage dipole has increased 5 times ! An EIGHT wire antenna increases gain of capture by 7 ! Although it is hard to work with, and build this antenna, for amateur radio use, it's one of the best. Kronberg Antenna was designed by Kent Britian, WA5VJB, and full credit (and blame) belongs to him on this design! This antenna is ideal for rovers, and is good for a fixed station on a budget. Just make the single top wire straight up and down at the desired length (19" for 2m, 6" for 440), and make all four ground radials the same length. Find many great new & used options and get the best deals for 4set Hh-9000 10/6/2m/70cm Hoher Gewinn Quad-band Antenne Pl-259 für Car Radio ZX at the best online prices at eBay! We offer a huge selection of Yagi antennas, including cross-polarized and circularly polarized, from top brands like M2 Antennas, Cushcraft, MFJ, and Diamond Antenna. I’m building this antenna for the center of the 2 meter band, so I’m going to divide 234 by 146 Mhz. To do that we’ll use the formula of 234 divided by the frequency to get the length of the radiator. After completing the basic assembly of the collinear antenna, apply a small amount of RF with the antenna on the floor or ground. Welcome to Elk Antennas! Log Periodic Antennas for the Radio Amateur 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 basic geometry of the antenna is shown in the following figure: An interesting feature of this antenna is that both dual-rectangular elements are electrically connected together, so strictly speaking, the antenna is a single When I tried running 100 watts to my 2 meter omni antennas, severe desense blocked my 70cm downlink receiver. Next to this I used 70cm of speaker wire I had laying around and a few tie raps to strap it all together. Ground-plane Antennas for 144, 222 and 440MHz For the FM operator living in the primary coverage area of a repeate r, the ease of construction and low cost of a 1/4-λ ground-plane antenna make it an ideal choice. Jun 26, 2020 · You can actually make a good 2m/70cm antenna that way by using a 2 m dipole and a close spaced 70 cm 1/2 wave element, or two 70 cm 1/2 wave elements one on each side of the 2 m dipole. Since I cannot afford those expensive power amplifiers for antenna frequency The goal was to build an antenna that doesn't need a support structure, provides good datas and is easily handable at portable operations. 5 metres of ladder line as the main antenna that can roll up neatly in a coil and can be used hanging from a curtain rail above a window, dropped down from a tree, or taped to the side of a fishing pole and raised Nov 17, 2008 · I like to build a Homebrew 2m, 70cm mobile antenna with a BNC plug to put onto a magnetic base that has the BNC ready for it. Antenna location is often far more important that designheight above average terrain is the best improvement one can make for VHF/UHF range and though I still suggest alternative antennas like a roll up "J" pole,my Big Stick,a good Magnet mount like Tram 1185,also a spare radio mounted antenna and adapters . Rank If we look at antenna books and articles about quad antennas, we will often find references to quad antennas having 2 dB gain over a comparable boom length yagi antenna. Feb 04, 2012 · A single antenna can cover the entire amateur 2m/70cm allocation with more than acceptable SWR. The Yagi has three forward lobes (according to the three current maxima in the 3/2-lambda-radiator) with 5,39dBd - 4,35dBd -5,39dBd gain. Any left over tubing can be used to make a stand for the antenna (Don't glue, it'll need to move!), I used some wall clamps and a piece of wood to mount mine in the loft (excuse the mess) and whilst it is horizontal for SSB I plan to add an additional 90' piece to allow for vertical polarisation so that I can access FM stations and repeaters! This antenna is similar in construction to the 2-meter OFC sleeve dipole I built over 8 years ago, but it is a simple center-fed dipole. You will  HYS Dual Band VHF UHF 2m/70cm Antenna with SO239 Connector for 136- 174Mhz&400-470Mhz Ham The antenna is simple to install and easy to carry. Calderon, DU1ANV Makiling Amateur Radio Society (MARS) Way back in 1987, I was at the Zurich Airport, Switzerland, waiting for my plane ride back to the Philippines after attending our yearly conference. Aug 21, 2018 · To build this antenna, we first need to make a couple calculations for the length of our radiator and radials. An allround antenna for all shortbands as well as 2m/70cm with integrated antenna tuner, connector PL-plug, just screw it directly onto the antenna jack of: pin. Past attempts at wire antenna's have resulted in off the chart SWR numbers so I not wanting to go that direction. The quarter-wavelength, ground plane antenna is made up of one vertical element, called the driven element, and four radials. this is the best dual band j-pole ever built 2m - 70cm direct connection beam dimenisions A lot of ham radio operators use an Arrow Dual band Yagi that is made by a company in the USA to make contacts over satellites. Stack Exchange network consists of 177 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Note: there are many ways to build your antenna and I'm sure some can come up with better mechanical designs then described here although the design and material used here is cheap and easy to find. 2m/70cm Dual Band Half-Wave Flower Pot Antenna The idea The half wave 2M version of the Flower Pot antenna is easily modified to a dual band antenna for operation on a band that is the [approximate] third harmonic of the fundamental resonance. 6-Band HF Vertical Antenna 6-BTV 6 Band Vertical HF Fixed Station 10, 15, 20, This antenna is great for use on a 706 -- offering 6m, 2m &amp; 70cm (440) all Diamond > Super Store > Amateur Radio > Ten-Tec, Inc. I bought one of these 2M/70cm J-Pole antennas 5 years ago and it still works great! I just used it to receive a SSTV image from the ISS during the 40th anniversary of the Apollo-Soyuz Test Project space flight. The first one is modified to be a 2m/70cm dual band and the other one is 2m mono-band as per design as described. 50 ft RG8x coax cable with molded PL259 connectors $25 Boost the range of your 2M/70cm handheld transceiver with this simple dual band Yagi--no soldering or coax connectors required! A Compact Multiband Dipole QST March 2016 pp. While shopping online for an diamond x510hdm antenna is easier and (based on an Australian CB radio) and with this and an old Jaybeam 48el TV antenna mounted vertically on a pole and turned by hand on the side of the house I was able to work lots of local repeaters and some decent inter-G DX on FM simplex when there was "a bit of a lift on". Virtually all Andrews mobile and base 2m-70cm antennas have an swr characteristic of <2:1 at  True Dual Band 2M/70CM Stainless Steel J-pole Antenna. Well, the title says it all: I want to start making EME contacts with the lowest possible budget, and I doubt between 2m, 70cm and 23cm. The Moxon pair, with lower but smoother gain across the sky dome, of-fers the fixed-antenna user the chance to build a successful beginning satellite an-tenna. This calculator is designed to give the vertical length (height) of a particular antenna, for the frequency and wavelength chosen. This antenna is not as good as advertise review by Ex customer on 8/17/2014 mobile antenna c-matcher, 10-80m, 30-2000pf, 600w $46. Nice job, Wayne! Here are the pics: The quarter wave is a good reliable antenna, and SWR is very robust and not affected by rain or snow etc. " 2m/70cm Fietspomp Antenna Voor Binnenshuis door PAØFRI De werking van een fietspompantenne is te vergelijken met dat van een ZEPP antenne. permits the antenna to achieve high performance, high power rat-ing low vswr, and broader band coverage on both 2m and 70cm bands. I found that a “contorted dipole” (I heard it’s officially called a zig-zag design) strung up on my ceiling works surprisingly well. 145MHz x 3 = 435MHz – that’s 2M to 70cm or VHF to UHF] 6m/2m/70cm Yagi Antenna Built from Old TV Antenna by KGØZZ This turned out to be a great little antenna. 5" JT82B 2m/70cm Dual Band 17" JTM3B 2m/70cm Dual Band 40" JTM3BNMO 2m/70cm Dual Band NMO 40" JT7505B 2m/70cm Dual Band 42 1/8" JTM2B 2m/70cm Dual Band w/mag mount BNC: JTM2P 2m/70cm Dual Band w/mag mount PL259. A Simple 2 m/70 cm Vertical Dipole Antenna This easy to build dual band VHF/UHF antenna makes a great project for the new ham that is ready to get on the 2 meter and 70 centimeter amateur radio bands. I made the second one specifically for on the road mobile use in a fiberglass body RV which has little to no ground-plane available so a conventional 2m mobile antenna would have several difficult issues to overcome (if even possible). Both types of 144 Mhz 5/8 wave antenna's described here has the same radiationpattern and gain, but type 2 has the advantage of being electrical Also, for very little more money, if one doesn't like the possible directivity of this antenna, one could simply build two of them, one for 2m and one for 440. actually making these things, especially for the 70cm band, the lead length of the capacitors should also be as near as you can get to zero mm! Position your coax connectors so as to allow this. If you want to use a dipole for a band of frequencies, you cut it to the center frequency on that band, and hope it has a low enough SWR at each end of the band. There are Do Everything Transceivers that come in a mobile-type form factor Here's a high performance unit to build at home. Build a Long Range Antenna for $20 If your television reception is poor to nonexistent, take a stand with this long range antenna you can build yourself. CheapYagi for 70cm – This article is intended to enable non-satellite hams to painlessly acquire the 440 MHz downlink antenna needed to actually hear and work a satellite. 2M antenna's available, it features a rigid rear reflector support that interfaces directly with the center feed boom arm at the base of the reflector. Calculate your phasing harness length for 144Mhz (2M) and 440Mhz Log Periodic Dipole Arrays, or LPDA is a directional antenna with relatively constant characteristics across it's wide frequency range. 5 metres of ladder  3 Apr 2019 The Diamond Antenna X50A / X50NA is a dual band 2m/70cm high performance gain vertical base antenna for base/mobile two way radios. Dualband Mobile Antenna 2m/70cm VHF/UHF Ham Radio, 137-149, 437-480 Mhz, Magnet Base PL-259 Connector, 10 Ft RG58 Cable . Nov 19, 2018 · Build your own 2m/70cm 3 Elements VHF by 5 Elements UHF Yagi antenna with excellent gain for both VHF and UHF operation. Make sure to poke a few small holes or notches in the spacer to allow the end of the antenna to breathe. The new 2m/70cm antenna is also the main motive for changing all the HF and VHF/UHF feeders and getting these into the shack more easily. Indicator Calibrated Step Attenuator Remote Antenna Antenna Under Test Standard Talkie in Standard Position Feb 23, 2017 · NOTE: Comparative testing of this antenna against one without the "choke" showed that the choke is NOT needed. Dec 5, 2014 - Two DIY dual band antenna's I built for VHF/UHF This set me back about 50 euro cents per 2 meter (which means about 0. 2 GHz band, DX Engineering has a VHF/UHF beam antenna that can deliver the clean, clear signal you demand. If you have a trap for the 70cm band in this antenna, passing a 70cm signal through will make the signal "stop" at the trap, and your antenna is resonant at 70cm assuming the length of the element below the trap is correct for that. j-pole antenna super j-pole antenna cubic quad antenna arrow antennas dual band j-pole note: this antenna was disigned by arrow antennas and it works great. There seems to be alot of crackling on some frequencies, not sure what the issue is, though the signal strength is S9++. Discover (and save!) your own Pins on Pinterest This is a great design for use with 2m/70cm transceivers with a single antenna connector. If you find that 49 feet is too short from the antenna, then add 11 feet to the coax from the antenna to the meters, making your total length, with jumper cable, 66 feet. A lot of people prefer these types because they are cheap to make, easy to install and use and also they are very durable. This calculator is designed to give the vertical length (height) of a particular whip type antenna, or the frequency of it. He also tightened up the gap between the 2m/70cm sections seen in these pictures; the pics were taken before he corrected them. 11 Feb 2012 Price tag : only 34,50 EURO's, a real bargain ! The antenna kit arrived within 3 days after making the payment. Three di Dec 18, 2012 · You may mention that this Yagi design antenna is only good for TX/RX on the 440 Mhz band (70cm). Don Murray W9VE Building a Dual-Band Antenna Mentorfest 10/23/04 19 Just for Fun • Make a jackleg antenna range to see how your favorite ducky or other portable antenna stacks up to your J-pole. The Dualband 2m/70cm Quad antenna project I have been moving a lot lately and haven't had a change to have an permanent 2 meter antenna. The challenge for this antenna was that it had to be compact enough to walk up a mountain and be very quick and easy to assemble and disassemble. A PVC coupling is used at the feedpoint to connect a couple of # 6-32 x 1/2" stainless steel bolts/nuts/washers to the coaxial cable (with crimpt style ring terminals). Since the pipe is available in ten foot lengths, you can make a few beams from a single 10 foot length. 6m Antenna Amateur Radio,Projects,Antenna Designs, Double Quad Beam,2m & 70cm SSB, Ham Satellites,Card Making, Recipes,BNOS,Flowerpot Antenna, Angela's Page,EXPMR Radio,Raised 146/437-10 Satellite Antenna (PDF) 146/437-14 Alaskan Arrow Satellite Antenna (PDF) 146-4 (PDF) 146-4BP (PDF) 146-3 (PDF) 220-3 (PDF) 121. I arrived at the airport too early and was The more perfect the antenna is operating, the less this will be an issue as we will have the highest possible impedance at the base of the λ/2 radiating section if it is a perfect half wave. In this article I show how to build up a small but competitive EME antenna and what is important to be successful with a small station. ) DBJ-2 (ham) dual band roll up antenna kit - (144-148 MHz and 440-450 MHz) Includes adapters for BNC, SMA and SMA - female. DIY 5$ Portable VHF Yagi Antenna for the 2 Meter Band (144-146 MHz) by F4HWK: In this publication i explain how to build a very light weight, cheap, easy to build and deployable in 30 seconds portable VHF antenna for the 2 meter band. This is important because if the mast extends above the antenna ground plane it will affect the performance of the antenna. Diamond X200A 2m/70cm Base Antenna, Diamond X300A 2m/70cm Base Antenna  22 Jul 2013 Randy has been using a 2m/440 MHz dual band HT with one of those really of the factors involved in erecting a VHF/UHF dual band antenna for 2m and 70cm We'll start with a few important decisions you need to make. If you prefer, apply RF to the antenna at this point and slide the toroids up and down until minimum SWR is found. The articles present designs and construction techniques for inexpensive and easy to build antennas that will make perfect first projects. 70cms has localised lifts every few days and that was part of the magic of the band: one day you could hear just locals Aug 08, 2017 · How to Build a Dual-Band Antenna for 2M/70cm. You can either homebrew your own one (very easy and lots of designs available on the internet - just use Google) or buy a 2m/70cm antenna from any shop that sells amateur radio equipment. Yaesu FT-8900R quad band radio 10m/6m/2m/70cm Comet/NCG UHV-4 quad band antenna 10m/6m/2m/70cm Comet/NCG CP-5M trunk mount Daiwa CN-101 SWR Meter. Aug 11, 2019 · Take your time, do it right the first time, and then, you can rest assured that your antenna will serve your purpose. I tried a bunch of different designs, including a trash-brew 40m base-loaded vertical , but it didn’t work that well. I'm in no way worried about strength of the pole or mounting the antenna to the pole, just what kind of easily transported antenna would be best to build. At this stage I suggest that you read my article on "A Satellite Tracking Antenna" to get an idea on how the antenna is mounted. The Yagi-Uda antenna is probably the most commonly recognized directional antenna in existence today. Measurements on overall length, and stub length are from the centerline of the separation pipe (horizontal) to the top of the antenna. I was so pleased with my results that I purchased enough materials to construct another J-Pole for portable use. 2m base antenna homebrew 2m base antenna homebrew Here is an all aluminum CNC machined simple to build and tune 6 meter magnetic loop antenna. 23 Feb 2017 NOTE: Comparative testing of this antenna against one without the "choke" showed that the choke is NOT needed. The antenna is built again in "ultralight" design and has a fixed cable to connect directly to the transceiver as I use it mainly for portable work without a tower. The antenna array may also be configured without the rotator and without the 2m/70cm antenna for use in an attic horizontally. depending on space and your I bit of a random question - if you spotted another ham (w/ a nice 2m/70cm antenna on their car), what is the best bet for making contact? I saw a guy with his radio on (hand-mic hooked to his jacket too) but I'm not sure of the etiquette of trying to call someone like that. Apr 08, 2012 · They are very easy to build and will perform better than the antennas that come with most handhelds. Dualband Mobile Antenna 2m/70cm VHF/UHF Ham Radio, 137-149, 437-480 Mhz, Do not work for SMA connections. This easy to build dual band VHF/ UHF antenna makes a great project for the new ham that is ready to get on the  2m/70cm dual band SO-239 ground plane. The statement often made is a single quad element has 2 dB gain over a dipole, and that 2 dB gain difference carries over into arrays of quad elements. Though this antenna design will work on any frequency, versions for frequencies below about 90 MHz will tend to be quite long. (Step-by-step instructions with photos can be seen below, following the project description and safety disclaimer. The antenna would make an ex-cellent starter for a tracking AZ-EL rota-tor system, but it does not have the beamwidth for good fixed-position service. Check your tuning before you solder your leads on the driven element if you plan to TX on this antenna or you could potentially damage your radio!!!! An additional antenna is typically required to TX on the 144 Mhz band (typically the uplink frequency). Although it has two sets of directors and reflectors there is only one driven element, so only one coax. Both types of 144 Mhz 5/8 wave antenna's described here has the same radiationpattern and gain, but type 2 has the advantage of being electrical 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. These antennas are perfect for packet applications and assembly is a snap with Cushcraft This antenna has a 2m gain of 2. The antenna has good reflection coefficient and VSWR  An Easy Dual-Band VHF/UHF vertical Antenna made with a TV twin lead and coax How to Build a Dual-Band Antenna for 2M/70cm presentation PDF file  This indoor dual band 2M and 70cm antenna is easy to build and tune. Using this antenna to make a contact that was 250 miles away moving at 17,000 MPH is probably the best testimonial I can give:) 73 VHF/UHF 2M/70CM Antenna HYS-771N BNC Handheld Radio Antenna for ICOM Radio V8 V80 V80E V82 V85 F3S HT-66 by HYS "Well made high value antennas from China. Using the pliers, bend each of the four rods you connected in Step 6 at the base of the connector until it slopes down at about a 45 degree angle. It is also an ideal low-cost ham radio club Mar 26, 2019 · Increase your range by selecting Cushcraft's 2M/70cm wideband Yagi beam antennas. Here are the plans to build a 2 meter J-pole antenna: The above dimensions for the J-pole are in inches. Antenna [ HOMEBREW ] Second life of dead MFM Hard drives 6 [ CATEGORIES ] POST IT ! 3 Ato D conversion 4 DDXX Caleendaar 244 The history of Torre Bert 36 [ HAM­MAG N. Most have also tried to make the data entry as painless as possible, but most fall short of easily referencing antenna elements and placement that the amateur radio operator would like. It can be built with very predictable results, even near trees or buildings, due to it’s low feed impedance. As seen at the Burnham Beeches Radio Club show & tell evening, the EA270ZB is a neighbour-friendly dual-band 2m/70cm beam antenna that gives you two, if not three, bands. The design comes from KI0AG and was originally published in the November-December 1997 AMSAT Journal. A slot antenna is a narrow rectangular opening in a large conductive surface, such as a TV satellite dish. 5/406-10 2m Dipole 2m Dipole Jul 16, 2020 · The original antenna had elements in the wrong places or missing along with the standard wrong, missing and damaged parts. Mar 21, 2020 · Again, this will probably be a 2m / 70cm radio that operates only FM, the most common mobile ham station. I was surprised that I could further reduce my desense by pointing my disconnected 2m/70cm beams at a right angle to my Lindenblads. The "J" can be made from almost any material: copper pipe, steel whips, and even 300 ohm TV twin-lead. When looking at choosing a discone antenna to buy, it is necessary to ensure that it best meets the needs of any requirements. It can be mounted on a roof top for use as a fixed antenna and it also folds conveniently for travel making it an excellent backpack antenna. I can leave it out and just pass it through the middle of Aug 11, 2019 · Take your time, do it right the first time, and then, you can rest assured that your antenna will serve your purpose. Click on Calculate and the opposite value will be displayed in feet and inches or frequency in megahertz (Mhz). The ring gasket makes the antenna water-proof, and permits the antenna to achieve high performance, high power rat-ing low vswr, and broader band coverage on both 2m and 70cm bands. 47 feet This is good, but there may be one more adjustment to make Ham radio 2m 70cm antenna The driven element is sized for 2M. It will work well on 2m but has a problem on 70cm because of interaction between the two dipole elements. power rating:200W (Total) All Elk 2M/440L5 models come with a handle for handheld operation, making this antenna perfectly set up for satellite, DFing, and very portable operations. The pattern will be Because the antenna is hand held, power should be kept to less than 10 watts maximum. 70cm, Collinear Antenna From Coax 440 Mhz J-Pole Antenna plans Here is a 70cm (440 Mhz) J-Pole antenna that is inexpensive, and easy to build. 70cm antenna

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