Dual Band J Pole Antenna

- 6 foot RG58 jumper, with BNC-M and BNC-F connectors. Although the radiation pattern is different, the antenna impedance is the same, and so will provide a good match to the radio in either case. For local and moderate distances, such antennas will deliver signals well above the noise level. Original PDF document can be downloaded here Related Posts via TaxonomiesGAP Titan DX MaintenanceThe gamma matchWindom Antenna 10-80A 40m Vertical AntennaThe Grid YagiQuickie VerticalAbout Loop AntennasAntenna Basics : […]. Fret not J-Pole lovers. High Gain Dual-Band 2m/440 Handheld Standard SMA Antenna Increase your handheld's VHF/UHF performance with this high gain antenna. The antenna has a grounded radiator and is thus immune to static charges. Unlike the popular ground plane antenna, it doesn't need ground The DBJ-2: A Portable VHF-UHF Roll-Up J-pole Antenna for ARES Edison Fong, WB6IQN WB6IQN reviews the theory of the dual band 2 meter / 70 cm J-pole antenna and then makes detailed measurements of a practical, easy to. The design is based on an article that appeared many years ago (1987) in CQ magazine, a version is produced by Arrow Antennas in the USA. Many have tried few have mastered the j-pole antenna! The storied j pole has long been attractive to ham radio operators as well as for professional use, primarily because of its effectiveness and seeming ease of construction. com My name is Michael, KB9VBR, and I carry a full line of VHF and UHF antennas for sale. At the base, a quarter wave matching stub forms the classic ‘J Shape’. The antenna has a low SWR (less than 1. important because if the mast extends above the antenna ground plane it will affect the performance of the antenna. They look pretty weird, as can be seen in the following photo: The picture to the right is of a 2m amateur radio band J-pole I built from an EZNEC simulation. When done, the antenna should also present 1:1. The original owner of Arrow antennas (not sure if he still is) published the design but the How-To was a text document with some neato ASCII art. Copper Dual-Band Super J-Pole Antenna Project. Just Google "twin lead j-pole" and you'll find several good articles on how to construct one (which takes about 30 minutes). Hdtv For Sale. I wanted something a little more substantial, though, for when operating at my primary/secondary QTHs. YOURSELF ! Note: I don’t know the originator of this clever adaptation so I cannot provide any acknowledgement. I'm especially interested now, as I'm considering an upgrade to an FTM-100DR for digital use via Yaesu's Wires-X network (I love Yaesu products), and I'd like to have the ability to use it around town via my mobile. Unlike the popular ground plane antenna, it doesn’t need ground The DBJ-2: A Portable VHF-UHF Roll-Up J-pole Antenna for ARES Edison Fong, WB6IQN WB6IQN reviews the theory of the dual band 2 meter / 70 cm J-pole antenna and then makes detailed measurements of a practical, easy to. I am a new ham. We are proud to offer them a somewhat lower price. Arrow Dual Band J-Pole - 2-Piece Ele OSJ146/440 ELC. I bought some #4 solid copper wire from the big box store and cut the long piece to specs. Your going to like this super J-pole project, This home made j-pole is easy to build and sturdy, While looking for an jpole antenna project to build I remembered seeing a Marine antenna called the Super J-Pole in the 1988 ARRL Antenna Handbook, which claimed a 6 db gain over a quarter wave ground plane. By no means is it my. See the eham reviews at this link. Once tuned, sweat the tubes to the straps so it stays put. Williams 54inches Standard Flat 300 ohm Twinlead Cut out wire and insulation. 220 MHz not only has repeaters but has become a. Putman, CTS Over the past some of the combo VHF-UHF antennas and high-band UHF DTV. I use the MFJ vhf antenna analyzer and a frequency counter then afterwards test with a radio and in-line swr/power meter. 2M/440 MHz Dual Band Copper J-Pole From N7QVC 432 8 Element Quagi Antenna By N2KBK 440 MHz -- 2 Element & 4 Element Yagi's - From The Antenna Elmer Super J-Pole Antenna (Collinear Design) - By KB0YKI U HF EggBeater Antenna - From ON6WG / F5VIF 432MHz 8 Element Quagi Antenna-- By IK1HGE 900 MHz Antennas Cheap Yagi Antennas for VHF/UHF-- From. If you have any questions about this project, contact KK4ICE@ARRL. Michael's 2 Meter Break-a-way J-Pole Antenna was the perfect answer. The guy’s in the US and makes. The Vortex 'Super J-Pole' Antenna consists of a five eighth wave vertical radiator, a half wave tuning section and a half wave top section. 10-80 meter Alpha. We have antenna ranges that cover up to 150 miles. I use a CB SWR meter to check 2M antennas all the time. The Dual-Band Open-Stub J-Pole Antenna. Dual Band MURS / GMRS. The UHF Female (so-239) is the default connector. We are proud to offer them at a somewhat lower price. I am now ready to go for a 2/70 antenna (dual band). baofeng UV-5RA has issues with j-pole. Half-Wave Flower Pot Antenna. A close look at how the J-pole antenna works with special attention to how it's fed. I saw the plans for this on the internet (link to plans) by Allen Lowe (N0IMW). They look pretty weird, as can be seen in the following photo: The picture to the right is of a 2m amateur radio band J-pole I built from an EZNEC simulation. Our flagship model, The Two Meter J-Pole Antenna comes in two different configurations, either as a one piece antenna for base station use, or as a two piece breakaway model great for portable operations. It works for 2m and 70cm. A J-Pole Antenna for the 70Mhz (4m) Amateur band. Arrow Antenna's dual band J-pole. Amateur Base Antennas The Arrow OSJ146/440 is an open-stub J Pole dual-band vertical covering 143-149 and 430-450 MHz with an SWR of less than 1. It does not hurt you to try or buy Ham Radio Dual Band J-Pole Antenna, Aluminum. 5:1 or better over the entire band. The simplest dual band antenna for 145 and 431 MHz 73 de IZ3AYQ. >> > Which antenna is better: 5/8 wavelength vertical or a J pole? >> >> Better for what? For example, a 5/8 whip would usually be better than a J > >Owen, I think the popularity of VHF mobile 5/8 antenna lies in it has >more gain than a 1/4 wl antenna and is easier to match to 50 ohms than >a. The pictures tell the story. Q: I built the dual-band J-pole antenna from the article in the September 1994 New Ham Companion ("An Easy Dual-Band VHF/UHF Antenna," page 61), but I just can't get it to work. Readbag users suggest that The DBJ-1: A VHF-UHF Dual-Band J-Pole is worth reading. Here a collection of links to make you own dual band VHF UHF copper cactus antenna. 2018 mWAVE became part of the Alaris Holdings Group of companies, mWAVE Industries, LLC offers one of the broadest lines of microwave antennas in the industry specializing in solid and grid parabolic, omni-directional and multi-point antennas in addition to feeds including conscan and monopulse designs. Some great uses for these antennas are: Camping; Hiking. Maximum power input 50 watts. Moonraker was established in 1978. The addition of the extra. Product Description. Please note: Not all unblock requests will be successful as it is dependent on how your IP address is being blocked. We already published in the 9 J-pole-antenna-projects some samples of copper J-Pole antennas. Just finished this Dual Band J-Pole Antenna. Before I built any home-brew mobile VHF antennas, the only VHF mobile antenna I had was an MFJ-1724B Magnet Mount Mobile antenna. The 1Notes appear on page 40. The antenna is tuned by sliding it up or down in relation to the mount and straps. antenna dimension chart note: all measurements on the chart is per leg click on the photo for a lager image standard dipole construction arrow antennas dual band j-pole note: this antenna was disigned by arrow antennas and it works great. 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. 2 dbi) and stealthy appearance (paint it the. Please note: Not all unblock requests will be successful as it is dependent on how your IP address is being blocked. 8 Antenna Compendium. 2M Ladder Line J-Pole Update: Since I wrote this, I've seen in several places that coil chokes are not effective on 2M & higher. This is the famous DBJ-1 dual band J-Pole antenna, designed and sold by Ed Fong - WB6IQN. Your going to like this super J-pole project, This home made j-pole is easy to build and sturdy, While looking for an jpole antenna project to build I remembered seeing a Marine antenna called the Super J-Pole in the 1988 ARRL Antenna Handbook, which claimed a 6 db gain over a quarter wave ground plane. I saw the plans for this on the internet (link to plans) by Allen Lowe (N0IMW). When I was looking to set up my base station at home, I looked through all kinds of designs, and ended on this one, the Dual Band J-Pole. The addition of the extra. The diagram below shows the basic arrangement of the 2m Half-Wave version of the antenna. SWR should be < 1. Any reuse or redistribution of the contents of this website are strictly forbidden without authorization from MFJ Enterprises, Inc. 2018 mWAVE became part of the Alaris Holdings Group of companies, mWAVE Industries, LLC offers one of the broadest lines of microwave antennas in the industry specializing in solid and grid parabolic, omni-directional and multi-point antennas in addition to feeds including conscan and monopulse designs. The basic configuration of the ribbon. I built this J-Pole antenna for GMRS radio. After some searching I came across this dual-band J-pole antenna and gave it a try, these are the construction details of it:. 2M Ladder Line J-Pole Update: Since I wrote this, I've seen in several places that coil chokes are not effective on 2M & higher. We call the antennas Slim Jims and they pack a lot of punch but do not unpack your wallet. There is no assembly necessary. Copper Pipe J-Pole Antennas By Rory Eikland, KG6HCU and Ken Larson, KJ6RZ Rory and I have had excellent experience building and using J-Pole antennas constructed from 1/2 inch ridged copper pipe, so we decided that we would share our experiences. When you use a browser, like Chrome, it saves some information from websites in its cache and cookies. I am going to build a dual band j-pole antenna. I've been producing these antennas professionally for nearly a decade now and have sold over 15000 units. See the main page for more information. When mobile, I installed a Tram 1185 mag-mount antenna (which also works well, especially with the new FTM-100DR!). However, it is imperative that you use the proper coax for the highest band of operation, RG58 just won't cut it and even RG8 in lengths longer than 25 feet is marginal in 440 operation. These are also cheap to make and was passed on to me from another ham and i thought I would pass. I built one of these myself and seems to work quit well. Trailed behind the airship, it consisted of a single element, one half wavelength long radiator with a quarter wave parallel feedline tuning stub. 195- 197 An Easy Dual-Band VHF/UHF. This antenna is also known as the “copper cactus” (because it kind of looks like one of course!). Rialto Amateur Radio Club. Base Antenna is rated 4. Dual-Band (UHF-VHF) J-Pole Ham Radio Antenna. At the VECOM meeting this morning I showed off the Ed Fong Dual Band J-Pole that I had just bought. com ARRL VHF/UHF Antenna Classics ARRL Vol. Dual Band (2 Meter/70 cm) Solid Aluminum J-Pole. Band Dual DBJ-1 VHF/UHF antenna ham meter/70cm 2 base base 2 meter/70cm VHF/UHF antenna Band ham DBJ-1 Dual $34. I bought the Arrow dual band j pole in hopes that I'd be able to get on VHF/UHF from an HOA perspective. A drawing by the author follows. Maximum Power - Only been tested to 1,000 Watts, it may take the whole 1500. 95; Tax included. Ed Fong WB6IQN of UC Berkeley. Lots of nice diagrams. 2/70CM “J” PORTABLE ANTENNA Plus a novel base support by N6JSX. You can do this with heavy PVC, a fiberglass rod, or even wood. Searching for an inexpensive, high-performance dual-band base antenna for VHF and UHF? Build a simple antenna that uses a single feed line for less than $10. So, an antenna that looks like a half wavelength on 2m will look like 1. I don't have a tuner/analyzer so don't know what the SWR is, but others that have built them report less than 1. 98 KB Want a Good Microwave Antenna-Drink More Coffee. 5 wavelengths on 70cm. The ubiquitous dual band j-Pole antenna, the SE-DBj covers 144 to 146 Mc. Here is a picture of the antenna mounted on the new mast. Readbag users suggest that The DBJ-1: A VHF-UHF Dual-Band J-Pole is worth reading. I have seen this basic diagram in at least five different sites. I've constructed a 144/440 Dual band Open Stub J-Pole Antenna. Many have tried few have mastered the j-pole antenna! The storied j pole has long been attractive to ham radio operators as well as for professional use, primarily because of its effectiveness and seeming ease of construction. For instance, the J-Pole antenna design for 2m/440 ops is a very popular homebrew project, and it can be created with simple aluminum from the hardware store or even from segments of twin lead feed line. Verified Purchase. Here a collection of links to make you own dual band VHF UHF copper cactus antenna. I built an Ed Fong DBJ-1 from the QST article about a year and a half ago (you can also buy them from Ed on ebay). All information, images, and documents on this website are the sole property of MFJ Enterprises, Inc. It has weathered six or seven Maine winters. A 'J'-pole is a vertical 1/2 wave antenna fed by means of a sort of odd shaped 1/4 wave section. PETRA INDUSTRIES Amateur Dual-Band Base Antenna with 17 ft. This is a GREAT little antenna for performance. 2:1 or less VSWR. Overall length inches (J Pole) inches (Slim Jim) B. True Dual Band base station antenna. Antennas 22. The Dual-Band Open-Stub J-Pole Antenna. Don't be fool by claims of dual band performance. 2 meter j pole to slim jim conversion : antenna related antenna forum (off site) publish your antenna project all band "ugly" balun antenna programs de ve3sqb qy4 quick yagi program qrz design downloads k5at antenna links wave propagation antennas "the easy way" get a good ground! arrl technical info service how to use an antenna tuner. Building the Antenna I like the copper J-pole, so I started a design using that antenna as a model. The antenna is a 'cactus j-pole' triband for 2m/220/440 built from copper water pipe and fittings. KB9HGI Cactus Dual band J-pole Dual band Cactus j-pole This is a very easy and simple 2 meter/70cm vertical antenna. 95; Tax included. Each panel is specially designed to work with the two frequencies used in dual-band systems. Copper Cactus Dual-Band Super J -Pole Antenna Project 2 meter 70 Cm Home brew antenna All the materials except the S0239 fitting can be found at any good hardware store, and the whole antenna can be made in less than an hour. Le migliori offerte per Authentic N9TAX VHF/UHF Slim Jim J-Pole Dual Band 2m 70cm Antenna jpole sono su eBay Confronta prezzi e caratteristiche di prodotti nuovi e usati Molti articoli con consegna gratis!. The J-pole antenna, more properly known as the J antenna, was first invented by Hans Beggerow in 1909 for use in Zeppelin airships. , 2-section antenna features a heavy-duty fiberglass base station, an insulated conductor, a 144-148 MHz /440-450 MHz frequency range, 6 dBd gain VHF/8 dBd gain UHF, and a power capacity of 200-Watt. com My name is Michael, KB9VBR, and I carry a full line of VHF and UHF antennas for sale. The J-pole antenna, more properly known as the J antenna, was first invented by Hans Beggerow in 1909 for use in Zeppelin airships. Few months, we saw a lot of people wearing or using these products. The antenna is a 'cactus j-pole' triband for 2m/220/440 built from copper water pipe and fittings. ) This is an excellent performing J-Pole type antenna, constructed from readily available materials. First I tried the antenna in the attic, and was able to hit a few 2m repeaters, then I bolted to antenna to the roof outside, no change in performance. VHF ¼ wave mobile VHF rubber duck Standard VHF J-Pole Dual Band J-Pole -24. 8 Antenna Compendium. A drawing by the author follows. Build a 2 Meter 5/4 Wave Antenna This antenna is unique in that it is enclosed entirely in 3/4" PVC. 25-meter (tri-band). Band Dual DBJ-1 VHF/UHF antenna ham meter/70cm 2 base base 2 meter/70cm VHF/UHF antenna Band ham DBJ-1 Dual $34. (can not obtain good VSWR on 440 but the 2m gain is outstanding - about 6dbd worth!) EXPERIMENT, create you own unique designs the "J" is a very forgiving, yet, robust and fundamentally versatile antenna that can let YOU put the technical design, development, and building. July 3, 2015 Antennas, Ham Radio, Test Equipment antenna, Baofeng, dbj-1, dbj-1 review, dbj1, ham, ham radio, HT, j-pole, jpole, review Michael This is a very limited test and review of the DJB-1 dual band HAM antenna that I purchased from Dr. If you are interested in a copy, send me an e-mail!. Szczegóły o Authentic N9TAX VHF/UHF Slim Jim J-Pole Dual Band 2m 70cm Antenna jpole Use with various radios. Arrow Antenna's dual band J-pole. com J-Pole dimension calculator for different frequencies at mJw. Yes, I built one and it seems to work just fine (at least on 2m and 440, I don't have 220). Keep in mind that handheld antennas are usually monopole antennas, like a vertical. Sounds complicated, but it really isn't. So, I decided that a pair of dual-band copper pipe j-pole antennas were in my future. I simply unrolled the antenna and hung in place. Built out of heavy duty 3/16" angle aluminum, UHF SO-239 connector with 3/8 aluminum elements and all stainless steel hardware. com ARRL VHF/UHF Antenna Classics ARRL Vol. _____ Costruire un'antenna J-Pole Dual Band 2M / 70 cm Questa antenna è facile da costruire al coperto o portatile su 70 cm o dual band 2M e 70 cm. Q: I built the dual-band J-pole antenna from the article in the September 1994 New Ham Companion ("An Easy Dual-Band VHF/UHF Antenna," page 61), but I just can't get it to work. This Roll-Up antenna is the perfect gain for preppers and traveling. It seems every time a person gets their license one of the first questions is what kind of antenna can they upgrade to so their HT radio will work better. Unlike the popular ground plane antenna, it doesn’t need ground The DBJ-2: A Portable VHF-UHF Roll-Up J-pole Antenna for ARES Edison Fong, WB6IQN WB6IQN reviews the theory of the dual band 2 meter / 70 cm J-pole antenna and then makes detailed measurements of a practical, easy to. DISCLAIMER: Any links provided are for the reader's enjoyment. pdf Generic J-Pole Calculator. 95 * Buy It. Band Dual DBJ-1 VHF/UHF antenna ham meter/70cm 2 base base 2 meter/70cm VHF/UHF antenna Band ham DBJ-1 Dual $34. T he EAntenna EA270J, is a vertical antenna dual band J-Pole type optimized to give 6 dBi in the 2 bands with one run of coax. TWIN-LEAD J-POLE VHF ANTENNA This is a design from an article by W9VZR in 73 Magazine ©, August 1977, P. And the 440 plot. One of the antennas Bob discussed was the HF wire fan dipole. With an SWR of 1. Yes you are right, the J pole is in plain view right under their noses. Thick aluminum base plate. permits the antenna to achieve high performance, high power rat-ing low vswr, and broader band coverage on both 2m and 70cm bands. 4 m vertical antenna for 40 meters band: a new antenna to test, easy to setup in portable mode. This antenna was featured in the Feb. Jeffrey NT1K. Our UHF Slim Jim Antenna delivers up to 6dbi of gain on the 440 - 470 Mhz UHF bands, which is almost twice the gain of a J-Pole and 5 times the gain of a 1/4 wave ground-plane antenna. went together easily. A DISCUSSION OF ANTENNA THEORY by Paul Graham (K9ERG) J Pole Calculator and drawing by K4ABT G. WiFi Antennas: How To Choose / Application Examples The two main categories of WiFi antennas are omni directional and directional. 50: Sirio 2008 (26. He is credited with original article in QST magazine. The Copper Cactus J pole antenna design is a simple amateur radio antenna model that will allow you to operate both bands. Ed Fong, WB6IQN, designed this 2meter/440 dualband J-pole antenna made of 300 ohm twin-lead that fits inside this thin-walled PVC pipe. It works for 2m and 70cm. This is my NEWEST deluxe model roll up Slim Jim/J-Pole antenna with 10' of coax! WHOLE ANTENNA IS 3 OUNCES and made to fit your rig! Are you looking for a truly portable antenna with BIG performance? This deluxe version is the same as my basic version but with 2 differences. This antenna was defiantly worth the purchase which was reasonable at $35. Michael's 2 Meter Break-a-way J-Pole Antenna was the perfect answer. This is the famous DBJ-2 dual band J-Pole antenna, designed and sold by Ed Fong - WB6IQN. Home / Tag: Dual Band J-Pole Tag: Dual Band J-Pole You may recall a review I did quite a while ago on the superyagi j-pole antenna for civil airband. They work great for amateur radio, public safety, scanner listening, business band, and GMRS purposes. The Slim Jim Roll Up antenna is basically similar to a Jpole design, but it exhibits a lower radiation angle in the range of 8-10 degrees on the horizon, compared to 1/2 wave Jpole which exhibits a 20-30 degree angle on the horizon. DBJ-2 (ham) dual band roll up antenna kit - (144-148 MHz and 440-450 MHz) Includes adapters for BNC, SMA and SMA - female. because it is based on Review of. The J-Pole is an older antenna design that's been around a while, but not widely used or thought of these days. Build a 2 Meter 5/4 Wave Antenna This antenna is unique in that it is enclosed entirely in 3/4" PVC. Visitor Comments. One of the most-talked-about antennas is now better than ever a true two-band antenna! Just when you thought that all the variations of the j-pole have already been explored, here comes the latest B-Square dual-band version that takes this popular but often-misunderstood antenna to new heights. Yes, I built one and it seems to work just fine (at least on 2m and 440, I don't have 220). The bandwidth is broad to cover the entire Amateur Radio. There is no assembly necessary. SWR should be < 1. Built out of heavy duty 3/16" angle aluminum, UHF SO-239 connector with 3/8 aluminum elements and all stainless steel hardware. Ed Fong, WB6IQN, designed this 2meter/440 dualband J-pole antenna made of 300 ohm twin-lead that fits inside this thin-walled PVC pipe. Hidden and stealth antennas; Antennas. The ARRL Antenna Book. Note on NEC2 modelling: Dual band antennas will often give segmentation check errors because two elements of different length are close to each other. This page documents a build of a 2-element 1/2 wave collinear J-Pole performed by Harry, KC9EOT, and myself, KB8OJH. also makes a dual-band J-pole, much like ItsBail's. It has a SWR of 1. com ARRL VHF/UHF Antenna Classics ARRL Vol. 00: Sirio SDB 270 2m/70cm Dual band Mobile Antennas $36. Watch TV for FREE with an indoor or outdoor HDTV antenna. This is the famous DBJ-1 dual band J-Pole antenna, designed and sold by Ed Fong - WB6IQN. went together easily. ) OSJ - Business Band, Marine Band & MURS 150-162 MHz. Here are the Plans I used. I bought the Arrow dual band j pole in hopes that I'd be able to get on VHF/UHF from an HOA perspective. 2:1 or less VSWR. 47 dB Table I Measured relative performance of the dual band antenna at 146MHz. Copper Dual-Band Super J-Pole Antenna by KA0NAN, April 1993. YOURSELF ! Note: I don’t know the originator of this clever adaptation so I cannot provide any acknowledgement. Build a 2 Meter 5/4 Wave Antenna This antenna is unique in that it is enclosed entirely in 3/4" PVC. About the J-Pole. DBJ-2 Ed Fong 12/14/2013 1of 27 VHF/UHF Dual Band J-Pole By: Ed Fong WB6IQN email: edison_fong@hotmail. J Pole Antenna for 2 Meters: This is a quick video of a simple J Pole antenna build for 2 meters. ) First, a 2 meter antenna does resonate at UHF. We are proud to offer them at a somewhat lower price. This is a GREAT little antenna for performance. Trailed behind the airship, it consisted of a single element, one half wavelength long radiator with a quarter wave parallel feedline tuning stub. When you use a browser, like Chrome, it saves some information from websites in its cache and cookies. Ed Fong WB6IQN explaining. This heavy duty antenna is made from 3/8 inch solid aluminum and features a heavy-duty angle mounting bracket and stainless steel hardware. What can I do? A: Try adding a balun to the coax. com My name is Michael, KB9VBR, and I carry a full line of VHF and UHF antennas for sale. Fret not J-Pole lovers. I getting ready to install it on my roof. vhf - uhf band plan chat 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. This in itself says something about the dedication I have to creating a quality product. ARROW ANTENNA OSJ-146/440-2 Dual Band 2 Meter / 440 MHz J-Pole Vertical Antenna 2 Piece Elements. A J-Pole Antenna for the 70Mhz (4m) Amateur band. It was a collinear dual band J Pole that would cover 2 meters and 440mhz. View Mediasonic HOMEWORX HDTV Digital TV Outdoor 100-Miles Range Antenna with Digital Signal Amplifier and Coaxial Cable UHF/VHF/FM DEALS. With an SWR of 1. Our flagship model, The Two Meter J-Pole Antenna comes in two different configurations, either as a one piece antenna for base station use, or as a two piece breakaway model great for portable operations. Here a collection of links to make you own dual band VHF UHF copper cactus antenna. Solid Aluminum Elements, Stainless Hardware. antenna dimension chart note: all measurements on the chart is per leg click on the photo for a lager image standard dipole construction arrow antennas dual band j-pole note: this antenna was disigned by arrow antennas and it works great. The MFJ-1890 is a lightweight aluminum antenna designed to operate in the 10 meter band and we had hoped that with a little messing around we could get it to tune to the 11 meter cb band. Q: I built the dual-band J-pole antenna from the article in the September 1994 New Ham Companion (“An Easy Dual-Band VHF/UHF Antenna,” page 61), but I just can’t get it to work. If anyone tries to sell you an un-modified j-pole and says it is a dual band antenna they are wrong they dont work, I have seen swr of 3:1 on unmodified j-poles on the 70cm band! So what are my SWR's Well I have a really nice meter that spits out some great charts to show the band sweeps on these antennas. The Copper Cactus J pole antenna design is a simple amateur radio antenna model that will allow you to operate both bands. http://users. this is the best dual band j-pole ever built 2m - 70cm direct connection beam dimenisions. It works for 2m and 70cm. Inexpensive and Simple Mono- or Multi-Band HF Ham Radio Antennas, by PrepperDoc Hugh James Latimer July 7, 2015 May 30, 2019 One of the distinguishing features of traditional Ham radio, particularly shortwave (high frequency or “HF”) Ham radio, was that you generally had to literally make your own antenna. Halo antenna for 70Mhz; Halo for 6 meters band; J-Pole antennas; Mirrored J-pole; Simple double-quad Antenna; Single Coax Feed to Multi-Band Copper Cactus Antenna; Single band copper pipe "J' Antenna; Six Meter Wavelength Band Antennas; The Copper Cactus Antenna; The Handi-Tenna 70 cm Portable Antenna; The SIMPLE 2m/440 Copper pipe "J" The. With RG-58 coax at 5m Here is why, A Slim Jim antenna is basically similar to a Jpole design, but it exhibits a. 5:1 on VHF and a little more on UHF, IIRC. Yikes! Kinda scary. The Dual-Band Open-Stub J-Pole Antenna. Two DIY dual band antenna's I built for VHF/UHF. In addition, a link to the QST article is included near the bottom of this page. Dual-Band (UHF-VHF) J-Pole Ham Radio Antenna. Original PDF document can be downloaded here Related Posts via TaxonomiesGAP Titan DX MaintenanceThe gamma matchWindom Antenna 10-80A 40m Vertical AntennaThe Grid YagiQuickie VerticalAbout Loop AntennasAntenna Basics : […]. 3 dB -45 dB -38. CB Coax Cable Springs, Studs & Disconnects SWR Meters Speakers & PA Horns CB Microphones. ) This is an excellent performing J-Pole type antenna, constructed from readily available materials. This heavy duty antenna is made from 3/8 inch solid aluminum and features a heavy-duty angle mounting bracket and stainless steel hardware. 1 out of 5 stars 72. Dual Band MURS / GMRS. 2m 70cm Dual Band Open Stub Solid J-Pole : I make these antennas out of solid, aircraft-grade aluminum, no weak tubing! These antennas are welded, so they are strong, have low resistance between parts, are more efficient and zero maintenance! Put one up and use it for many years. One of the antennas Bob discussed was the HF wire fan dipole. home products & services networking and communication equipment rf, microwave, and wireless components antennas united states connecticut Antennas Suppliers in Connecticut Antennas are structures or devices used to collect or radiate electromagnetic waves. The Slim Jim, designed by the late Fred Judd, G2BCX, can be a great portable 'roll up' antenna, if made out of 300Ω or 450Ω ladder line / twin feeder. After some searching I came across this dual-band J-pole antenna and gave it a try, these are the construction details of it:. 2-1 at 146 MHz and <1. The antenna is tuned at the matching section by the sliding up and down of the feed points which can be time consuming and requires an swr meter or antenna analyzer. It has weathered six or seven Maine winters. Before I built any home-brew mobile VHF antennas, the only VHF mobile antenna I had was an MFJ-1724B Magnet Mount Mobile antenna. No endorsement may be inferred from the mere listing of a URL or link. Jeffrey NT1K. This antenna was featured in the Feb. 95 * Buy It. The electrical principle of the wire antenna for shortwave is the same as this J-antenna or J-Pole: a halfwave length or radiator fed by a quarter wavelength feed. (figure 2) The balun provides the matching between the 300 ohm antenna, and the 50 ohm line. com ARRL VHF/UHF Antenna Classics ARRL Vol. The radiation pattern of J-pole-T antenna showed an omnidirectional shape. 4-1 at 144 &148 MHz. Here is a link. It has weathered six or seven Maine winters. collinear antenna 450 mhz schematic. Although traditional VHF J-pole antennas will resonate at UHF, they suffer a -6dB loss at UHF over a ¼ wavelength groundplane. Band Dual DBJ-1 VHF/UHF antenna ham meter/70cm 2 base base 2 meter/70cm VHF/UHF antenna Band ham DBJ-1 Dual $34. Solid aluminum dual band end fed J-Pole (SO239) Home Amateur Radio Antennas: VHF-UHF Vertical Antennas. The J-Pole antenna is an omnidirectional antenna that can be used for base, mobile and field day stations. 4 GHz 10 el. J-Pole antennas are one of the true works of electrical engineering that gives us a smaller footprint vertical with no need for a ground plane. Copper Dual-Band Super J-Pole Antenna Project. 00: Harvest RH10M 7-430MHZ Full Band Mobile Antenna $79. We are proud to offer them a somewhat lower price. It features a single feed point via a stud mount SO239 socket. mhz amateur meter. So, I decided that a pair of dual-band copper pipe j-pole antennas were in my future. J-Pole Antennas are still Cool. This is a project of an easy to build dual band (UHF and VHF) j-pole antenna done with a common TV twin lead and some coax cable. The antenna costs almost nothing to construct and should handle up to 50 Watts of power. The Dual-Band Twinlead J-Pole antenna is made from standard flat 300 ohm twinlead TV antenna wire, available from most hard- ware and electronic stores. As a new ham, I was looking for a portable antenna. For 3-meters (FM broadcast band) it is probably the antenna that is the best solution for many micro power radio stations. This calculator can be used to design a Slim Jim or a J Pole antenna. 2 meter j pole to slim jim conversion : antenna related antenna forum (off site) publish your antenna project all band "ugly" balun antenna programs de ve3sqb qy4 quick yagi program qrz design downloads k5at antenna links wave propagation antennas "the easy way" get a good ground! arrl technical info service how to use an antenna tuner. A J-Pole antenna is a half-wave vertical fed at its base through a shorted quarter-wave stub acting as a transformer matching section. Proudly serving radio enthusiasts around the world since 2000! We welcome RM Italy and Sirio Antenna. My main shack location has a commercial J-Pole Dual band mounted on a short mast. J-Pole Antennas: all made of solid stainless steel. 47 dB Table I Measured relative performance of the dual band antenna at 146MHz. But how do these things work? Here is a great presentation from Dr. 2 meter 70 Cm Copper Cactus J-Pole Antenna Home Brew Dual Band J-Pole Antenna Plans.