Homemade 2m 70cm antenna. Most Ham bands are harmonically related.

Homemade 2m 70cm antenna Here's a great weekend project that will improve your coverage and efficiency on the 2m/70cm amateur radio bands. Slide the PL-259 coax connector from your feed line up through the piece of conduit or /PVC plastic pipe. Build A 9 dB, 70cm, Collinear Antenna From Coax - Link : Accurate LC Meter Build your own Accurate LC Meter (Capacitance Inductance Meter) and start making your own coils and inductors. This video takes you through the entire build process including testing. Even though the deepest null occurs only in the vicinity of the design frequency, the front-to-rear ratio–accounting for the full rear quadrant–is very good I’m kind of surprised that the dual resonance of the 2M and 70cm dipoles don’t create a 25 ohm antenna. I want to use the antenna for the 2 meter band and the instructions for the 2 meter band are loud and clear. A fellow Ham recommended that I try building a 2 meter / 70 centimeter vertical dipole antenna. Wideband design "5/8-Wavelength Vertical Antenna for Pentecost, Mobile Work," Ham Radio, May 1976. I was inspired to by Marcel Stieber’s (AI6MS) presentation “Dual-Band Satellite Dish Slot Antenna” who was in turn inspired by John Portune (W6NBC), guru of all-things-slot-antenna. Well thanks for the help but it is not going to work as I said I am trying to make a antenna for a car. However, there a Thanks to Clint of "Oxford Shortwave Log" for this coaxial collinear antenna system for 2m and 70cm. 0 MHz. https://youtu. A 2M SlimJim antenna is easy to keep in your bag or glove box for rapid deployments. For an SWR of 2, the Video on repurposing surplus 800mhz 5/8 wave antennas to VHF and UHF. This is a really easy, fun antenna to build. NET. Use it for better coverage at a parade, a bike-a-thon or just on a stroll. Thread starter W2PAK; Start date Sep 12, 2024; W. Adjust 6-inch all-thread for lowest SWR on 446 MHz. Both call for 1/2" EMT conduit. ) This is I got around to building a DBJ-2 Roll-up 2m/70cm J-Pole Antenna yesterday. Homemade vertical dipole for HAM 2 meter and 7 Six Meter Folded Dipole Antenna; 2 meter/70 cm telescopic dipole, homebrewed; Simple to make 2m/70cm antenna project for portabl Homemade Full Wave Dual Band Antenna for 2 meter a MFJ Duplexer-two Not so long ago I built my version of The Home-Brew SKYLAB Starduster for 26 - 30MHz, Super simple to build with just 10 metres of wire and a length of coax. While Moxon is one of the smallest directional antenna it still broadband so no need to tune every time and has great, impossible for small Yagis, F/B that is fine too. So far I’m really happy about the performance. The 70 cm Build: For a half-wavelenth 70cm band slot of 33. Home Depot! [Edit: Forgot to mention that my antenna analyzer showed an SWR of 2 Meter Slim Jim Antenna using 300 Ohm Twinlead. 17 (If you can't find aluminum rod or wire or welding rods, try metal coat hangers - they work too. The modification involves placing a co-ax phasing sleeve around This page contains construction details on a 2 metre 144MHz VHF Yagi beam antenna, designed for portable use. It’s a - a trap has a resonant frequency at which it has very high impedance. 2m and 70cm have a small enough wavelength that antennas don’t need to be ridiculously big. Here is my dual band VHF / UHF vertical dipole antenna. I was looking to build an easy to breakdown 2 meter antenna for an event I was helping with. So, I downlink the FM LEOs (AO-27, SO-50 and AO-51) with a homemade, handheld 440 MHz Yagi antenna. DIY Dual-Band 2m/70cm PA0FBK Antenna. 5 cm) at each end to strip the insulation, peel Today, I’m going to show you how you can easily build a homebrew 2 Meter ¼ Wave vertical antenna for under $10. I don't particularly enjoy building antennas. photo). and 5 Elements on 70 cm and one Feedpoint. com/channel/UCdJlIoWR3mf7apfB1dXS97ATemporarily As you guessed the antennas are an issue too. They are known for their compact size and ease of installation, making them a popular choice among The basic half wave version of the Flower Pot antenna can be readily modified to dual band the antenna for operation on a band that is the (basic) 2m half-wave Flower Pot. The Science Operation on the third harmonic is achieved by using 2m/70cm Gentleman's Walking Stick by W6NBC & W6ND Walk about freely with this pedestrian-portable antenna. 6:41 . Depending on the materials in your "junk box", you could build this VHF/UHF antenna for almost no cost. Build A 9 dB, 70cm, Collinear Antenna From Coax by N1HFX Simple to make 2m/70cm antenna project for portabl Homemade Full Wave Dual Band Antenna for 2 meter a MFJ Duplexer-two radios one antenna or vice versa; Idiot's Guide to Wire Antennas; My low cost 10 meter DIY; Ground Radials for Vertical Antennas; Soldering PL-259 and N connectors; 7 and 28 MHz HF Pedestrian Mobile with 6 meters of Retevis 144/430MHz Amateur Dual-Band Base Antenna,2m/70cm 7. One pink asterisk is at 2M, and two pink asterisks is at 70cm ham bands. This antenna is made by a professor and his students. Part Number: DMN-X200A. 2m 70cm DualBand High Power Antenna 2m70cm21WP 21 Elements. With common connector for both bands or with separate connectors for 2 meter and 70 cm. To construct the antenna, first select a suitable length of grey 25mm conduit (as a minimum 1m but if you make it longer, you will have more room below the coil to attach to your antenna support). tech=====Here are the measurem this document contains the detailed instructions to build a homemade lindenblad antenna using a twin lead as dipole elements this document contains 9 pages and includes a detailed construction sequence and some drawings to build this antenna for uhf and vhf ham radio bands. The best part? It cost me less than $20 and took me less than an Diy Tape Measure Yagi Antenna for Ham Radio: Today we are going to build a Yagi antenna designed for 2 meter and 70 cm ham radio bands. Top Amateur Radio Websites – Issue 2501. I've bought a few whips for my HTs and thought it was about time I made an antenna of my own. You can use one common feedpoint or two seperate feedpoints depending on how you would like to connect this antenna to your transceiver. Antenna for Portable Satellite: Handheld Elk 2M/440L5 Dual-band Log Periodic antenna (used with ICOM 705, Kenwood TH-D74a or BaoFeng UV-5R. Excellent mechanical properties. This antenna is called a 'Halo Antenna' due to its circular shape. bz/2m-70cm_vertical_dipole_antenna. Next time The DIAMOND X-510N 2M is a high-performance antenna designed for 2-meter amateur radio use. be/MYWTxbUW3RsHomemade full wave antennas for ham radio on 2 meter and a 40 inch slot cut in a parabolic dish, fed with a so239 jumper about 4. 1/4 wave ground planes work well, but will have half the signal of a dipole. Not completely shutting down your idea, but make sure to look into other antenna types. Just my two cents. youtube. The 3" stub has a panel-mount SO-239 through a 3/4" copper cap. This is so I can use my 2m and 70cm handheld in the car. 99 $ 75. This LC Meter allows to measure incredibly small inductances making it perfect tool for making all types of RF coils and inductors. The rate of gain increase slows down with further increases in the antenna height. Either way let your creativity work for you. HAM RADIO: Easy SlimJim / J-Pole Dual band Antenna Build for 2m/70cm, Thanks to a book I purchased many moons ago, I have found the perfect way to pass a ra We already published in the 9 J-pole-antenna-projects some samples of copper J-Pole antennas. Vertically polarized and blends in nicely. These antennas have little resale value and as such are ready candidates for experiment Figure A shows the azimuth pattern of a 2-meter Moxon when the antenna is vertically oriented and, hence, vertically polarized. If you decide to make a 2m antenna, you’ll end up with 1. Put one of these antennas in your "go-kit" for emergencies. Source: img. I don't care for the stock antennas either because they don't flex and will take a permanent bend from the excess I carry around my middle. 70cm Egg Beater: I only had vertical 5/8 ground plane antenna fro 70cm and 2m band and wanted to get better reception on the new cube satellites frequency. This article includes How long is too long? Be cautious about dual-band antennas for 2m/70cm. 18-16 to 18. 3mm stainless steel rod was used for the antenna arms and various other bits and pieces I had laying around in my shed were used to complete the build. Slim pickings and most are incredibly stiff to get the coverage from 2m-70cm-gmrs. Handmade Slim Jim Antenna by . When vertically oriented, the same antenna shows much more modest gain (largely due to the wider beamwidth Diy 2m/70cm vertical dipole antenna . The Seen as a 2m half wave antenna, the piece of undamaged cable jacket in the middle does not really play a role. dxChat 0. For me was important to install it on the roof and use it for repeaters and local coms. Most Ham bands are harmonically related. n9tax %PDF-1. This portable 2m/70cm antenna is suitable for both portable and home operation. Weight: 4,4 kg: Dimensions: 149 × 19 × 10 cm: 2 reviews for 2m 70cm DualBand High Power Antenna 2m70cm21WP. This is post 2241 in a continuing series of simple ham radio antennas. ) A really quick antenna for 2 metres and 70 centimetres, made from just 2 metal coat hangers and a small length of strip connector just add the fun. LC Meter can measure I built and have used a "tape measure yagi". B. Knight. Perfect gain and swr on both bands. Install 6-inch all-thread and hand-tighten nuts. a 2m 70cm dual band j pole antenna for 35 usd an excellent performing j pole type antenna constructed from readily available materials . fuzzthepiguy. 5 inch antenna just gets in the way. Resources listed under 70cm antenna category belongs to Antennas main collection, and get reviewed and rated by amateur radio operators. a gain antenna. Version 2: With 8- and 10-mm-Elements (see down), built by SQ9VPA. A magnetic mount antenna for a car placed on a window air conditioner works well. Joe's project design is from an older ARRL book. Version 1: Ultralight with 3,2-mm-Elements. Note: this antenna is PRE-TUNED for 430mhz band BUT is CUT-TO-TUNE for 144mhz band. dxGallery. Building my Eggbeater II Omni low Earth orbit satellite Antennas for 70cm and 2M. (Cut 1mm at a time using a VSWR bridge) The SIMPLE 2m Copper 'J' Antenna - modified yet ag; I've modifed the design using the original dimensions, but added an 3" stub making it an "abbreviated 'H'". Slim Jim 2M Antenna – SV5BYR. In order to transform this piece of coaxial line into antenna you need to remove a bread shield in the middle of the coax, and solder braid shield to a central conductor at its both ends (cf. An upgraded version of the Vhf dipole antenna. Homebrew a j-pole 2mt and 70 cm antenna project. 96 out of 5 stars. Long answer. I've worked . 22. Both plans call for 3/8" stainless threaded rod which I will be using. 5in driven element but with the bent part the wire would be 57. It works the 6 meter, 2 meter and 70 centimeter bands. In this video, Dave Tadlock (KG0ZZ) shows us how to design, build, test, and use a simple dual band VHF/UHF antenna. 3 %Çì ¢ 8 0 obj > stream xœÕVKk 1 ¼ëWè˜ ¬HŸÞÇ zé¡eiÎ&~4%¶±ÓPúï+í®Öëõd³”@© /b˜ù^’5>p) q™Ÿ²xز »ùêøæ™}IK An antenna for frequency F will also be resonant near F*3, so you may not even need 70cm elements. Its very easy to chat with people 30-50 miles away using a simple hand held radio using just 5 watts. To compress a couple of days of exploration in simulation into a short summay: I began by exploring A ground plane antenna for 2m or 70cm is one of the simplest antennas to build and get working, and it can work quite well for repeater or simplex operation. Has recorded build instructions for the Amateur Radio Supplies 2m/70cm Dual Band J-pole kit is the subject. Very low price and excellent performance on 2m and 70cm. Ed Fong talks about it in this presentation where he goes over what 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 Be sure and subscribe to these great channels:TheSmokinApe: https://www. They end up being chunky inflexible antennas with barely acceptable performance. Strong boom. . (distances depend on location and surrounding topography) 6m/2m/70cm Yagi Antenna Built from Old TV Antenna by KGØZZ This turned out to be a great little antenna. Manufactures typically spec the usable bandwidth of their antennas at the 1. Original article published on February 1992 on 73 Amateur Radio Today about the 2m and 70 cm copper cactus J-pole antenna (by KE7AX) Easy Jpole Building; Easy home brew 2 meter copper jpole antenna build - under 20 bucks - Hits repeaters 45 miles away. Joined Jul 18, 2024 Messages 13 Location Deale, Maryland. All the 2M dipoles I’ve made had a nice resonance on the 70cm ham band as well — although the pattern is a different shape of course. The VSWR of 70cm was below 2 across nearly the entire band. you can create a portable 2M/70CM radio station for contacting other amateurs. The 220 band isn’t so making a multi band antenna is really hard to do. By ON4CFC Via Antennex Super J-Pole Antenna (Collinear Design) - By KB0YKI VHF/UHF Antennas-- By KB0YKI -- J-Poles, Super J-Pole, Omnidirectional, Quads, Yagis VHF EggBeater Antenna - From ON6WG Now try to add gmrs into the antenna mix. Eureka St. 5dB gain on UHF Unity gain on 2m Note: You can NOT use a spring with this antenna. He has different types of antennas available. Satellite Antenna Array: AMSAT LEO Pack 16 element 436 MHz 436CP16 and 8 element 144 MHz 2MCP8A with AZ / EL Yaesu G-5500 computerized rotator with Fox Delta ST-2 controller. As you can see, the impedance of the antenna is very well matched to a 50 ohm system. Needless to say 2m Moxon can be mechanically combined with electrically apart 70cm antenna (Moxon, Yagi, whatever) on the same boom as easy as Yagi. Ground-plane Antennas for 144, 222, 449 MHz ARRL Antenna Book, 18 th Edition, pp. (Cut 1mm at a time using a VSWR bridge) Welcome to the crazy world of antennas. Once constructed, you plant the antenna in a literal flower pot, paint it green and decorate it This is a series of videos showing how to build an Omni directional horizontally polarized antenna for 2 meter single side band operation. I show you how to quickly build a DK7ZB yagi with 4 elements on 2m and 5 elements on 70cm with minimal tools. This assembly is Put antenna up horizontally about 4 feet above ground and check VSWR, you should be lower in frequency than you want to be. So I built a simple flower pot antenna from PVC pipe and coax. Everyone has to make their first antenna. ) Depending on the frequency or band, the average length of the gap and spacing between 2m & 70cm Dual Band Antenna M270 : Length 975mm Gain 4dBi: Antenna UHF collinear fiberglass covered with PVC 4. That means you might get away with an antenna the works over the range of two services, like Ham 70cm and GMRS, or Ham 2M and MURS. Cut the RG-62 about (5 cm) longer than these measurements and leave (2. net/dk7zb/ In past posts, we have built several 2m portable antennas. 8:1 across the whole range with a minimum at 446 MHz Very minor adjustments can be made by raising or lowering the 70cm rod More adjustment requires a different length rod SWR Sweep for 70cm of this design 22 Specific Dual Band 2m- 70cm J-Pole Antenna YouTube build instructions Dave Casler, KE0OG in his You Tube Series “Ask Dave #42”. 75in long? It's a really great omni antenna for the 2m band. There are many simple choices that don't involve trying to put a large antenna on a roof. The yellow trace is the VSWR reading from the antenna analyzer. The slot antenna may be well suited to this purpose, particularly for smaller attics given its horizontal orientation with vertical polarization appropriate for local 2M FM repeaters. Listed under the Antennas/Lindenblad category that is about Lindenblad Antenna. Thanks to Paul Foulkie for this great antenna idea. Excellent gain 7+14 elements 2m 70cm DualBand High Power Antenna 2m70cm21WP with a single connector on the 3m boom. It has a gain of 8. Each antenna was tested at the same height and using the Not so long ago I built my version of The Home-Brew SKYLAB Starduster for 26 - 30MHz, Super simple to build with just 10 metres of wire and a length of coax. I have issues with J-poles, and while easy to build, I think they interact with their feedlines way to much. Mike does an excellent job of taking us through the design, construction, and testing process for this remarkably simple antenna. If you plan on mounting it outside, apply RTV or sealant around the center pin and PL259, and tape well, to keep water out of the coax. Meaning they have multiple elements stacked and phased together vertically - where the end of one feeds the bottom of the next one via a coil (which introduces a delay or phase shift) which reverses the phase. Is that also possible with this design? Keep up the good work! regards, Job (Netherlands) Thanks to M6STL for this ultra-simple 2m/70cm antenna made from a length of RG-8 coaxial cable. These two excellent documentations by ON6WG and F5VIF served as a basis for the There is a collinear antenna called the DBJ. -Connect a SWR meter to the antenna and to the radio, making sure you attached it to the right connector posts Half-Wave Flower Pot Antenna. Antennas: J-Pole. Build the Slim Jim Antenna If you need a compact, nearly invisible VHF/UHF antenna for your ham shack, then try this "Flower Pot" design from Mike (M0MSN). 3 ft Height, Each. If you have any questions about this project, contact KK4ICE@ARRL. 5MHz 7-30MHz/50MHz Multi Configuration Coil Antenna with Telescopic Laser Engraved Markings and Anodized Color That means you might get away with an antenna the works over the range of two services, like Ham 70cm and GMRS, or Ham 2M and MURS. 17qq. n9tax. The 2m half wave element is then divided into 3, and the upper and A short video showing two of my homemade Yagi-Uda antennas for 70cm. A dipole cut for 2M will already have resonance on 70cm near 50 ohms. Half-Wave Flower Pot Antenna. Specifically for the 2m and the 70cm amateur radio bands. 5 cm) long. I’m looking to eventualy make some satellite contacts with a DIY antenna but don’t know what plans to go with. 7cm) was cut just below the 2M slot with two holes drilled for a -To tune the antenna to my country, Malaysia amateur VHF band 144-148 Mhz, I set the radio frequency to the center frequency of 146 Mhz so it can generally covers the whole VHF amateur band. The Diamond 2m 70cm vertical antennas are a type of antenna designed for use in the 2 meter and 70 centimeter frequency bands. Its utility will impress you. I read the article he was referring to (see reference below) and it looked to be a nice antenna that others were having success with. I know there is eleventy thousand Prefabricated Dual Band VHF/UHF Antennas out there, but if you want to make your own with 100% tunable capability for both bands on the cheap then this post is for you. I found a good compromise in I've been wanting to make this video for a while. The pattern and the currents of the Yagi are shown down. The Copper Cactus J pole This video shows my dual band antenna that I made for use on the 70 centimeter band (432 MHz) and the 2 meter band (144 MHz). 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. Reflector elements can be added if slight directivity is Hi Mike, thanks for this manual. Some Notes on the Slim Jim Antenna – M0UXB. Now made dual band vhf/uhf by 2 dipoles in parallel. Band The Shooter — A 3- Portable Antenna in a jiffy? Try Want a vertical you can put up or take down this penny-pincher's Field Day special! Antenna for 70 cm 432-440 MHz category is a curation of 61 web resources on , 70 cm Helix Antenna, 432 MHz yagi antenna, J-Pole antenna for UHF Bands. It’s high angle. 6 pounds. You can build this with stuff you have laying around. Do a simple Google search for DBJ Antenna and you'll find his links. by ScottDuckworth. Half-Wave Flower Pot Antenna – 2M or 2m/70cm Dual Band Image 1 – the Basic VHF 2M Design This is the basic 2m Half-Wave antenna using grey 25mm conduit – to build a Dual Bander with 70cm First construct the 2M antenna , then fit the sleeve as shown in image 14. High gain, Low Noise, Wideband operation, Excellent F/B. Then alternately adjust length of 18-inch all-thread and 6-inch for best SWR on 446. A lot of times, it's a geometry that has good SWR on 70cm, but will have an abysmal signal pattern. html Presentation by Joe EI6EG on the construction of a 2m - 70cm Dual Band "Eggbeater" Antenna. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright There's an antenna design called a "flower pot" which is a half wave 2m wire antenna in a PVC radome that can be modified for dual band use if you like. Here a collection of links to make you own dual band VHF UHF copper cactus antenna. The diagram below shows the basic arrangement of the 2m Half-Wave version of the antenna. Larsen VHF/UHF Mobile Antennas are your "go to" source for all your VHF and UHF mobile antenna needs, along with the cable assemblies to support them. 5 cm) long and the 2 meter phasing line is (41. For example 432MHz, 70cm band, is exactly 3 times 144MHz, 2 meter band etc. Sep 12, 2024 #1 Hi All, I recently built 2m/70cm Dual Band J-Pole by KK4ICE . Mike calls this antenna the "perfect stealth antenna" for 2m/70cm. 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 70 cm phasing line is (13. Connect the PL-259 connector to the antenna SO-239 connector, and let the antenna sit on top of the mast tubing. The antenna works very well and is quite "stealthy. All of those antennas sold by Diamond, Comet and the knock offs are collinear. (Step-by-step instructions with photos can be seen below, following the project description and safety disclaimer. STEPS #22 to #25: COMPLETE THE ANTENNA. 2 . I don't want to do a permanent antenna install yet, mostly cause I want to plan out a coax entry box. Special Note: When horizontally oriented, antennas show an initially rapid increase in forward gain as we elevated the antenna to and above 1 wavelength. The 4-El. I am going to build a dual band j-pole antenna. It can be used to communicate with amature radio satellites or to assist in getting into that repeater that is just a little to far away. Sent from my SM-S901U using Tapatalk 2 Meter Vertical Dipole Antenna. qsl. 7 feet in height, and weighs around 6. The trick was in a video The antenna can be mounted by clamping the PL259 to a mast or even passing the coax through a 3/4 ID PVC pipe and compression clamping the PL259. Listed under the Antennas/J-Pole category that is about J Pole antenna plans. Top Amateur Radio Websites – Issue 2449 To make the Eggbeater antenna project even easier and more cost efficient, I decided to build the Eggbeaters myself, but to design the 70cm Eggbeater dedicated for the downlink and the 2m variant for the uplink. 4:1 and 1. The total length of the dipole is 30 cm. 3 dBi and can handle up to 200 watts of power. 2 dBi High Gain Base Antenna, SL16 Connector Repeater Antenna for Retevis RA25 RT95 RT97 RT97P Ham Radio Mobile Transceivers (1 Pack) 4. Duoband Yagi 2m/70cm with 4 Elements on 2 m . 5dBi 100W Yagi Antenna 8 Element Beam 2 Meter/70 cm VHF/UHF Outdoor Yagi Antenna with U-Bolt for 144/430Mhz Ham Mobile Digital Radio/Repeater (TC-YG08UV) 104. The center connector is soldered to a 12 gauge piece of insulated copper wire which feeds up through the matching stub PacketRadio Operator's Antenna Handbook-- Antenna Basics, 2M & 6M Antennas SlimJim 2M Antenna Sperrtof 2M Antenna-- aka Sleeve Dipole or Sleeve J-Pole. Here, the piece with an unremovared plastic cover does resonate at about 435MHz. News. It works fine! My wife thought it quite amusing that I was shopping for satellite communication antenna components at . The shorter 70cm waves have a much easier time getting through window openings than the longer 2 meter waves. 1 out of 5 stars. Slim Jim Build. If we look at the antenna as a 70cm antenna (435MHz), it will be completely different. They sacrifice too much, especially in performance. For an SWR of 2, the SLIM JIM ANTENNA PROJECT Several designs rolled into one Edited and condensed from various designs Page updated with new information and videos (See the 2 meter SSB loop project on this site for better details and pictures of the nut, bolt arrangement. If you need a quick, free, and easy-to-install antenna for 2m and 70 cm, please consider this wonderfully simple project using metal coat hangers. I would like to build a dualband 2m/70cm yagi to transmit from my HT and receive with a handheld scanner I Mounting the antenna to a mast A ¾-inch conduit or PVC plastic pipe can be used to support the antenna and mount on a mast. (Or even store Slim Jim Antenna Project – VU2RMU. Here i present the measured SWR of the antenna. 7cm (λ/2 = 150/445 = 0. I use one outside for 2m work and another one inside for APRS. Design 2m Slim Jim antenna made for under £10. These antennas are vertically polarized and are commonly used by amateur radio operators for Otherwise I can't really tell that it's in the attic. You should be able to find most of the materials at the nearest building supply center or neighborhood hardware store. I'm a new operator and I've already got a self-made ground plane for 2m band but I wonder if different designs could be more efficient. You should show continuity from the tips of each antenna element to it's respective end on the coax feed when your done) Time to add the coax. 2m & 70cm Dual Band Antenna M270 : Length 975mm Gain 4dBi: Antenna UHF collinear fiberglass covered with PVC 4. 99. It is made with durable materials, measures approximately 16. Take the non-connector end (the end at the antenna) and strip off about 1 and 1/2 inches of the outer jacket. You may be able to find most of the antenna materials in your home or at a neighborhood yard sale. Make it cheap. For details: http://www. My First Antenna - A Dual Band (2m / 70cm) Flower Pot Antenna. The electrical design for this antenna is from Cheap Yagi Antennas for VHF/UHF by Kent Britain, WA5VJB, (Google Cheap Yagi). The Best Amateur Radio Links of 2024. 3370M or 33. One el-cheapo (actually free) wooden 7 element and a much better built 10 element. Local friend was dxHome. These antennas are vertically polarized and are commonly used by amateur radio operators for communication on VHF and UHF frequencies. The V2000 covers 6 meter, 2 meter and 70cm bandsBu While Moxon is one of the smallest directional antenna it still broadband so no need to tune every time and has great, impossible for small Yagis, F/B that is fine too. 2M Yagi Antenna: This antenna is my 'experimental' twist on the tape measure yagi antenna. Rated 5 out of 5. Larsen has been a major antenna HYS Dual-Band 9. It is easy to build for other bands as well. $98. I have two different plans that I found on the internet. Zooming in on 2M shows a slightly better SWR than the full spectrum, at between 1. 5/11. Obviously, the place to start was a dual band UHF / VHF antenna. ) Build a Portable Groundplane Here a link to another video of the antenna that shows the measurements. But keep in mind that 2M and 70cm share a similar relationship as 40M and 15M. " This must be one of the simplest yet most effective DIY 2m/70cm antennas yet. Some of the radios ship with 2 antennas, a combo for 70cm/2M and a separate one just for 220 for that reason. Since an old 5 element version (v1) of my antenna was shown in the July 2011 edition of RadCom, a few people have Here i present the measured SWR of the antenna. 2m shows a 38. Top. And if you want a better antenna, and you want to make it, you can't go wrong with a collinear. Estimated Ship Subject: Homebrew 2m/70cm Dipole Antenna Sun Mar 19, 2023 9:35 pm: Following on from my PMR446 Antenna I decided to try my hand at constructing a 2m/70cm Vertical Dipole Antenna. 99 $ 98. It works great and it offers you the option to properly adjust the SWR. 6 inches) long antenna! 🙂 In a quad this means that =====More information on my website at http://www. amateurradio. However, there a 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 Best DIY 2m/70cm antenna . Dual band antenna 2m 70cm applications: The big wheel is a horizontal polarized omni directional antenna. Cebik web site – requires registration (free) Commercial 2M 70cm Slim Jim – N9TAX. -Ultralight-Yagi for 2m can be used on 70cm with an SWR of 1,5 without any changes. New posts Search forums. Dual Band Antenna for 2m and 70cm. 5 and 3 across the band. Here are some comments from Clint: Hi there, G1ZMA kindly decided to build me another antenna for 2m and 70cm and here it is. Like you mentioned, there is simply a coax running directly from the antenna to my radio. JamesA Radio Addict Posts: 757 Joined: 04 Get your antenna outside, especially if you are using 2 meters. $75. As a vertical, the 70cm radiation pattern on a 2M antenna is not ideal. I often see the 2 meter and the 70 cm bands combined in one antenna. New items Series list Latest content Latest reviews Latest questions. Pull the center conductor out through the braid so you now have two separate "wires". Box 1105, 1016 E. The driven element of this Yagi is a folded dipole which i made from a piece of RG316 cable. This post is about building the 70cm antenna. Sep 12, 2024 #1 Hi All, I recently built a super simple and affordable dual-band 2m/70cm antenna using a PA0FBK design. This little handheld 2m/70cm Yagi is an easy build, and it performs really well on both bands. com With a surplus satellite dish on my hands as a result of an internet upgrade, I began to look around for a potential amateur radio use. 0 MHz and 445. The different length conductors show different impedances at different frequencies; at a given source voltage you can drive the most current into a conductor when the impedance (AC resistance) is low. 2 Meter Slim Jim Antenna using 300 Ohm Twinlead. I will start with the project soon. Or the ladder line is too short! If the frequency is low, then slide the 26 inch piece of CPVC up or down over the matching network or lower element and trim opposite side (short side) of the 300 ohm ladder line. This is how my Diamond V-2000 is installed and the performance I have gotten out of this vertical antenna. Yagi Antennas for 144 and 432 MHz. Nowadays I try to avoid tri-band antennas. The antenna is suitable for both base station and mobile applications due to its vertical design. Search items. Or fastest delivery Wed, Jan 15 . I, like many readers, have built numerous 'tape measure' style antennae for the odd field day or DF event and whilst they do the job 2M Moxon Antenna: I tried my first contest recently (RSGB 2M UKAC) and really enjoyed myself, although I realised just how restrictive my J-Pole antenna was when it comes to SSB and directionality so I build this little moxon antenna The NA4IT "CHEAP" Dual Band 2/440Mhz Ground Plane Antenna. The 2 meter side of my antenna is optimized for 145mhz, and the 70cm I enjoy building antennas. O. GRA-7350T CB HF 3. 2M Slim Jim antenna using Aluminum Tubing. For a radio that is designed to be carried on your belt, a 15. FREE delivery Sat, Jan 18 . The most difficult part was cutting the sheath of RG58 and RG316 off without cutting the ground braid. This antenna is perfect for HAMS that need a quick reliable solution for local 2 meter a 40 inch slot cut in a parabolic dish, fed with a so239 jumper about 4. ANTENNA I have a big tree in my yard, a 5W dual band HT, and an old 45W mobile 2m unit(ft-212rh) that i think still works, but not 100% sure. Most people make these for 2m use, but you can make them for 70cm use if required. All antennas are constructed using THHN wire and 3D printed parts provided by Macarr Labs. If you are new to Amateur Radio, or just want an easy to deploy 2 Meter antenna for out in the field, this is a Complete Workflow: Modeling, Feeding, and Tuning a 20m Band Dipole Antenna; DIY Helix High Gain Directional Antenna: From Simulation to 3D Printing; Evaluating EMF Compliance - Part 1: A Guide to Far-Field RF Exposure Assessments In this article, the author introduces a straightforward vertical dipole design tailored for the 2m and 70cm All 2 meter / 70 cm antennas: 2m/70cm antennas 2m / 70cm Common Connector antenna 2m / 70cm Two Connector Dual Band . New media New comments Search media. Find VHF/UHF Base Vertical Antennas 2 meters Band Coverage and get Free Shipping on Most Orders Over $99 at DX Engineering! Amp up Your Operation with the DX Engineering Super Card – Apply Now! Dual-Band, Base, Fiberglass, 2m, 70cm, 200 W, UHF Female/SO-239, 8. 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 DIY Dual-Band 2m/70cm PA0FBK Antenna. It’s wasn’t hard at all. I’ll show you several different 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 Step 8 –Measure SWR for 70cm (Optional) Sweep the antenna from 440 MHz to 450MHz –the SWR should be between 1. dxForums. 5:1 SWR points. Alternately, hang it in a tree or mount it permanently. If you are wondering what Amateur Radio is about, it's basically a two way radio service where licensed operators throughout the world experiment and communicate with each other on frequencies reserved for license holders. Welcome to Reddit's own amateur (ham) radio club. 5 inches from the end of a slot, yields a stealthy antenna which can be used for 2m and 70cm. Jpole or a flower pot or a dipole or maybe something different. My Homemade Version NOTE: Comparative testing of this antenna against one without the "choke" showed that the choke is NOT needed. You could easily build something like a tape measure yagi or a dipole and they would be small enough to fit on a house and not attract too much attention. I plan on using 3/4" copper pipe. Homemade 2M/440 J-Pole Antenna By KK4ICE. L. This project is perfect for both home and field use. Both the Diamond X50a and the N9TAX Slim Jim are very Larsen VHF/UHF Mobile Antennas. 121. A simple ham radio 2 meter and 70 cm antenna for fixed or portable use. dxRadioTech . Patterns are shown across the 2-meter band for a model designed for 146 MHz. Making a fan dipole with these two bands may being the 70cm impedance down around 25-30 ohms. Presentation by Joe EI6EG on the construction of a 2m - 70cm Dual Band "Eggbeater" Antenna. Between 144 MHz and 146 MHz, antenna has an SWR less than 1. 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 One other thing, the larger diameter wire or rod tends to increase the bandwidth too. Figure 1: “Compromise 2m/70cm Dual Band Antenna” Optimal Compromise For 2m/70cm @145. 4. Radio sales, P. I re-engineered the mechanical design to be super lightweight and super easy to build. Plans are available from https://www. Lima OH 45802, GOI-51048 telescoping whip antenna. W2PAK Member. It is horizontally polarized an I made another antenna; a 70cm Quad antenna, and it works like a charm! The “bad” thing about quads is that they are full wavelength antenna’s, which in HF normally means; LONG ANTENNAS! The “good” thing in this case is that a full wavelength in the 70cm band means; a 70cm (27.