Dual Band J Pole Antenna

Don Murray W9VE Building a Dual-Band Antenna Mentorfest 10/23/04 7 Impedances along J-Pole Matching Stub (This part does the work of radiating) (This part does the work of matching the line to the dipole so that it can do its work. J POLE FOR 220 BAND REPEATERS KG7GTE 2 METER SLIM JIM A first time builder shares his fun! The Vent Pipe “Lightning Rod” Antenna “Stealth on the roof” by N4UJW. It is an outstanding performer, especially when you get it up in the air. Construction Plans for the Arrow Model J146/440. The Buddipole™ - HFportable dipole antenna system, Welcome to the home of the Buddipole™, an hf/vhf portable dipole antenna system which is designed to be modular, versatile, and efficient. 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. It had to be an antenna not taking to much space, that I could build with parts that I still had lying around, but nevertheless still had a good SWR so I could transmit on it as well. The ARRL Antenna Book. by Mike Walkington, VK1KCK. Dual Band (2 Meter/70 cm) Solid Aluminum J-Pole. OSJ - Model OSJ 146/440 Dual Band J-Pole with Extra Labor Charge for Two Piece Element (Will also fit in the Antenna Bag if ALL the elements are removed from the bracket. If you are interested in a copy, send me an e-mail!. Thanks for any help. 2 METER/440 “J” USING CB WHIPN6JSX. J pole antenna (1) kit (4) Knight Smite (1). 4 m vertical antenna for 40 meters band: a new antenna to test, easy to setup in portable mode. pole Antenna for Public Service WB61QN reviews the theory of the dual band 2 meter / 70 cm J-pole antenna and then makes detailed measurements ofa practical, easy to replicate, "roll-up" portable antenna. 3 dB -45 dB -38. 2/70CM “J” PORTABLE ANTENNA Plus a novel base support by N6JSX. Ed sells these antennas on ebay for $37. 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. Install 70cm stubs on the 2m antenna to create a good UHF radiation pattern. orders from Canada, Mexico, Caribbean, Brazil and rest of Latin America. Base Antenna is rated 4. Yes, I built one and it seems to work just fine (at least on 2m and 440, I don't have 220). 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. Antenna building skills are a must. Antena OSJ dual band VHF / UHF com um cabo: Antenna VHF tipo JPOLE: Antena J-Pole para 146 MHz, 220 MHz, 440 MHz J-pole antennas for 2m-40m with Wireman-cable, DK7ZB:. 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. Ask Question I doubt the J-pole is the issue; you didn't mention about how it acts with its stock antenna. The antenna is complete with exception of the 7 ft PVC ¾ inch pipe which can be purchased from any hardware store. 8 Antenna Compendium. because it is based on Review of. 3 db gain (140-174), 5 db gain (420-500) over stock. In this paper, a dual band J-Pole antenna for VHF and UHF transceiver radio communication was simulated and implemented. The radiation pattern of J-pole-T antenna showed an omnidirectional shape. Putman, CTS Over the past some of the combo VHF-UHF antennas and high-band UHF DTV. 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. We are proud to offer them at a somewhat lower price. com ARRL VHF/UHF Antenna Classics ARRL Vol. Forrest Cook WB0RIO. A Copper Pipe Jpole for Two Meters. With RG-58 coax at 5m Here is why, A Slim Jim antenna is basically similar to a Jpole design, but it exhibits a. I do not know who did the original, but there are variations in several of them. I built a a J-pole 1/2" copper pipe antenna that I found plans for on u-tube. Mount the antenna on a pole about 6 feet long and fasten to a step ladder or some support with some rope or electrical tape. Just finished this Dual Band J-Pole Antenna. The end-fed dipole as a. Williams 54inches Standard Flat 300 ohm Twinlead Cut out wire and insulation. 3 db gain (140-174), 5 db gain (420-500) over stock. Also check out the J-Pole Antenna site. About the J-Pole. 2 METER/440 DUAL BAND SLEEVED DIPOLE MODIFICATION BY W7LPN Rick Frazier The photo above is of my balun modification of the QST August, 2006 page 50, 2 Meter/440 dual bander sleeved dipole by Geoff Haines, N1GY. A balun is necessary because a J-pole antenna uses a balanced feed (the. For local and moderate distances, such antennas will deliver signals well above the noise level. So, I decided that a pair of dual-band copper pipe j-pole antennas were in my future. Antenna building skills are a must. Includes adapters for BNC, SMA and SMA - female. It works for 2m and 70cm. Forrest Cook WB0RIO. The antenna is complete with exception of the 7 ft PVC ¾ inch pipe which can be purchased from any hardware store. Then I cut and bent a shorter piece to specs. 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. We already published in the 9 J-pole-antenna-projects some samples of copper J-Pole antennas. 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. The end-fed dipole as a. It provides gain of 2. We have antenna ranges that cover up to 150 miles. I’ve constructed a 144/440 Dual band Open Stub J-Pole Antenna. A 'J'-pole is a vertical 1/2 wave antenna fed by means of a sort of odd shaped 1/4 wave section. Yes, I can send you one of the antennas tuned to one VHF and one UHF frequency. A copper pipe J-Pole antenna is a single band antenna that is much like a. Copper Dual-Band Super J-Pole Antenna Project. December 11, 2017. Heavy Duty construction that allows 80 MPH wind survival with 1/2" radial ice. J-POLE ANTENNAS. You have just found the webstore of the highest quality hand made portable antenna on the market. Most of us oldtimers will remember this wire as the twinlead used to connect a TV to the roof-mounted antenna that almost all homes in this country dis- played before the advent of cable TV. 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. The pictures tell the story. Dual Stainless - $269. In my design I use 1/2" copper schedule M tubing and 1/4" soft copper tubing. 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. by Mike Walkington, VK1KCK. 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 DBJ-2: A Portable VHF-UHF Roll-Up J-pole Antenna for. mhz amateur meter. , 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. Dual-Band VHF/UHF Twinlead o-----Loop of nylon line (to hang antenna) J-Pole Antenna By James A. also makes a dual-band J-pole, much like ItsBail's. It has a SWR of 1. Readbag users suggest that The DBJ-1: A VHF-UHF Dual-Band J-Pole is worth reading. Mount the antenna on a pole about 6 feet long and fasten to a step ladder or some support with some rope or electrical tape. PETRA INDUSTRIES Amateur Dual-Band Base Antenna with 17 ft. 3 db gain (140-174), 5 db gain (420-500) over stock. Heavy Duty construction that allows 80 MPH wind survival with 1/2" radial ice. 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. The ‘J-Pole’ Antenna consists of a half wave vertical radiator and an adjacent quarter wave tuning stub which forms the classic ‘J Shape’. 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). 98 KB Want a Good Microwave Antenna-Drink More Coffee. My workshop under the garage needed to have a separate antenna, preferably hung from a nearby tree. Dual-Band VHF/UHF Twinlead o-----Loop of nylon line (to hang antenna) J-Pole Antenna By James A. J Pole Antennas Variations on a Theme Page 1 of 3 The Copper Cactus Two-band J-Pole was from a 73 article by John Post KE7AX and was Copper Cactus dual band. NRHARC Downloads: Downloadable Ham Files. Many commercial HF antennas use this technique to achieve good patterns on their multi-band antennas. J-Pole Tutorial from Gary E. 195- 197 An Easy Dual-Band VHF/UHF. Copper Cactus Dual-Band Super J-Pole Antenna Projec t 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. After some searching I came across this dual-band J-pole antenna and gave it a try, these are the construction details of it:. Find Hdtv In Stock Now. 95 * Buy It. About the J-Pole. 3 dB -45 dB -38. The DBJ-1 is easy to construct using. In my design I use 1/2" copper schedule M tubing and 1/4" soft copper tubing. The J-pole and other end-fed Hertz antennas are prime examples of antenna that can have severe feed line common mode current problems. Hi! I need a J-Pole antenna to use with a Uniden 105XLT airband scanner. (A more detailed explanation is given in my February 2003 QST article. It is an outstanding performer, especially when you get it up in the air. 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. Dual Band: works well on the 440-450MHz - 70cm band for great dual band performance. Dual Band J-Pole Copper Cactus J pole antenna - 2 metter 70 Cm dualband Mounting the J Pole It would be best if you attach it to a mast of some kind to get it up off the roof, at least a little. Форум » Радио » Антенны КВ и УКВ » Dual band J-pole 144/430 mHz 3/8" x 24 Thread CB / Ham Antenna Mount w/ UHF / SO-239 Connector. All of my antennas are designed by me, built, tuned and tested by me. Arrow Antenna's dual band J-pole. Based on test results, the J-Pole-T antenna was resonating at frequency of 148 MHz with VSWR 1:1,1, while at the UHF band of 454 MHz with VSWR 1:1,05. 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. My antennas have a low noise floor and a beautiful omnidirectional radiation pattern. permits the antenna to achieve high performance, high power rat-ing low vswr, and broader band coverage on both 2m and 70cm bands. See the eham reviews at this link. The antenna is complete with exception of the 7 ft PVC ¾ inch pipe which can be purchased from any hardware store. O'Neil, (N3GO) J Pole Antenna at Radio_electronics. pdf Generic J-Pole Calculator. It has excellent DX properties and will out- perform many theoretically better antenna systems. It was a collinear dual band J Pole that would cover 2 meters and 440mhz. A description is then given on how this dual band principal is applied to a fully portable "roll-up" J-pole antenna. I have a new dual band 2M/70cm J-pole that I have just installed on my roof. The original Ed Fong Dual Band VHF/UHF 70cm/2m J-Pole PVC Pipe Antenna : Eye-On-Stuff The original Ed Fong Dual Band VHF/UHF 70cm/2m J-Pole PVC Pipe Antenna : Eye. Both plans call for 3/8" stainless threaded rod which I will be using. A close look at how the J-pole antenna works with special attention to how it's fed. Scaling them for other bands is quite straightforward - In this example, I'm making it for the 144-146MHz (UK allocation) 2m band but you will find that it works reasonably well on 70cm, as well. I simply unrolled the antenna and hung in place. High Gain Air Band Antennas. Dummies guide to aircraft antennas Probably the single biggest issue that we encounter with the installation of our XCOM radios by customers in the field is poor antenna performance. It has excellent DX properties and will out- perform many theoretically better antenna systems. homebrew collinear j pole for dual band vhf uhf antennas. (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. Technically, the Pockrus™ J-pole Joystick™ antenna is a dual-band (2 meters and 70 cm) open-stub, half-wave J-pole antenna. Product Description. UHF ¼ wave mobile UHF rubber duck Standard VHF J-Pole Dual Band J-Pole -38. If you’re like me, you like to save some money. Making a Coaxial Dipole If you start with a common half wave (λ/2) stainless whip and extend it all the way down through a λ/2 long support tubing, Homebrew Coaxial Dipole for VHF or UHF Here’s a base station antenna you can easily build for 146, 220 or 440 MHz. PETRA INDUSTRIES Amateur Dual-Band Base Antenna with 17 ft. You can do this with heavy PVC, a fiberglass rod, or even wood. a dual band J-pole? Adding a Second Band to the J-pole To incorporate UHF coverage into a VHF J-pole requires some explanation. Dual Stainless - $269. 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). 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. If you're like me, you like to save some money. 6 dBi on 2 meters and about 5. (figure 2) The balun provides the matching between the 300 ohm antenna, and the 50 ohm line. This page is broken 🙁 I've assigned my best minions to fix it up - KB3KAI. Most are standard VHF j-pole that resonates at UHF (all antennas do that). The J-Pole antenna is an omnidirectional antenna that can be used for base, mobile and field day stations. Whether you’re operating on 2 meters or you work in the 1. I have had this antenna on my roof since 1992 and it has been problem-free in the San Francisco fog. com ARRL VHF/UHF Antenna Classics ARRL Vol. tional single band ribbon J-Pole design to dual-band operation. VHF ¼ wave mobile VHF rubber duck Standard VHF J-Pole Dual Band J-Pole-24. We are proud to offer them a somewhat lower price. ARRL's PDF on twin-lead J-Pole antenna. , but buried in the noise. 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. Yikes! Kinda scary. Also includes a 6 ft extension cable. Also check out the J-Pole Antenna site. 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). Krishna kumar due to Abstract— This work carries a dual band monopole antenna design specially meant for wireless applications like Wireless Local Area Network (WLAN) and Worldwide Interoperability for Microwave Access (WiMax). Hidden and stealth antennas; Antennas. I specialize in a certain type of antenna called a J-Pole. In my design I use 1/2" copper schedule M tubing and 1/4" soft copper tubing. Thanks for any help. Both call for 1/2" EMT conduit. I have two different plans that I found on the internet. Both plans call for 3/8" stainless threaded rod which I will be using. mhz amateur meter. 1 out of 5 stars 72. com(designed by wt9h)and cant get swr below a 3. However, I have built more than six of these antennas and can attest to the great performance. I saw the plans for this on the internet (link to plans) by Allen Lowe (N0IMW). I set to work to scale the antenna from its original size up to a length that would work for at least part of the 6 meter band. This is the famous DBJ-2 dual band J-Pole antenna, designed and sold by Ed Fong - WB6IQN. I’m worried about things as the radio sees it, not from the birds vantage point that rest on the antenna. Build a 2 Meter 5/4 Wave Antenna This antenna is unique in that it is enclosed entirely in 3/4" PVC. 4 GHz 10 el. If you find any other interesting links or information, let me know and I will include it here. 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 it appears it could be, below is the photo and the link to where the antenna can be purchased on line: Maybe worth keeping an eye on this seller as recently he had a 934Hz CB antenna for the car for sale. I built a a J-pole 1/2" copper pipe antenna that I found plans for on u-tube. IOio Dual Band 70cm / 2M Antenna - Radio Y Satélites THE "IOio" ANTENNA AND THE SATELLITES Scheme nº1: can analyze the impedance in the VHF band and it can only see the SWR in the UHF band, so I studied the VHF band and the impedance was between 40 and 75 Ohms into. If the antenna best suited for your location is too large for the attic space available it is best to go outside with the antenna. Dual Band VHF / UHF Gain Base Station Antenna ANLI A-100 Amateur Radio. 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. Proudly serving radio enthusiasts around the world since 2000! We welcome RM Italy and Sirio 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 : […]. 220 MHz not only has repeaters but has become a. (figure 2) The balun provides the matching between the 300 ohm antenna, and the 50 ohm line. 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. After some searching I came across this dual-band J-pole antenna and gave it a try, these are the construction details of it:. The addition of the extra. this is the best dual band j-pole ever built 2m - 70cm direct connection beam dimenisions. This mobile whip antenna won't take long to build, works well and only requires one feed line for the two-band coverage. Based on test results, the J-Pole-T antenna was resonating at frequency of 148 MHz with VSWR 1:1,1, while at the UHF band of 454 MHz with VSWR 1:1,05. Antennas 101 Presented by: •A J-pole antenna K4KRW Collinear J-Pole •Bob K9TMU’s Slim Jim •Variation on J-pole •dual band. Got a question? Great, use my contact form to ask away. Solid Aluminum Elements, Stainless Hardware. The guy's in the US and makes. What others are saying J-Pole Base Antenna 2 meter Dual Band Heavy Duty Amateur Ham Radio Scanner 2 Meter 70cm Dual Band J Pole Antenna 144/ 440 Mhz Ham Radio With Weather Boot. Any rig you can protect from an EMP, the critical task then becomes antenna, antenna, antenna. We are proud to offer them a somewhat lower price. Now the HF band antenna (preferably 20 meters) is going to be a problem. 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. J-Pole Antennas: all made of solid stainless steel. He described it as a 3 element J Pole with 2 phased elements. 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. HRO Discount Price: $68. 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. All information, images, and documents on this website are the sole property of MFJ Enterprises, Inc. Carr Design by G. 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. Diagrams 300 Ohm twin-lead. (Step-by-step instructions with photos can be seen below, following the project description and safety disclaimer. Here is a picture of the antenna mounted on the new mast. Before I built any home-brew mobile VHF antennas, the only VHF mobile antenna I had was an MFJ-1724B Magnet Mount Mobile antenna. In this paper, a dual band J-Pole antenna for VHF and UHF transceiver radio communication was simulated and implemented. My SWR readings taken with a antenna analyzer are (Mhz/SWR) 145/1. 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. You must know how to build anything from a J-pole for VHF to a beam for HF, and to erect and tune them without an antenna tunner and make them work the first time. I got a set of plans for a Dual-Band J-Pole that works AWESOME!! I use the antenna listed in the plans and Get EXCELLENT SWR and TX/RX. PopScreen - Video Search, Bookmarking and Discovery. Some great uses for these antennas are: Camping; Hiking. jpg Easy VHF-UHF Antenna. Tri-band Delta Loop Antenna for 80m - 40m - 30m Dual-band Loop Antenna for 30m - 40m Wire-Beam Antenna for 80m Dual-Band Sloper Antenna Inverted-V Beam Antenna for 30m ZL-Special Beam Antenna for 15m Half-Sloper Antenna for 160m Two-Bands Half Sloper for 80m - 40m. 2 meter 70 Cm Copper Cactus J-Pole Antenna Home Brew Dual Band J-Pole Antenna Plans. Форум » Радио » Антенны КВ и УКВ » Dual band J-pole 144/430 mHz 3/8" x 24 Thread CB / Ham Antenna Mount w/ UHF / SO-239 Connector. Dual Band (2 Meter/70 cm) Solid Aluminum J-Pole. Maybe you know of a Web page site, that has this information. RadioBanter » rec. This is a multi-band antenna which gives the amateur the capability of utilizing several radio bands with only one feed line. This calculator can be used to design a Slim Jim or a J Pole antenna. 10-80 meter Alpha. We call the antennas Slim Jims and they pack a lot of punch but do not unpack your wallet. I got a set of plans for a Dual-Band J-Pole that works AWESOME!! I use the antenna listed in the plans and Get EXCELLENT SWR and TX/RX. This super efficient VHF / UHF antenna provides a OMNI directional 3 to 9 db gain depending on position and is usable in 4 positions. The Alaris Holdings Group. Solid Aluminum Elements, Stainless Hardware. 5:1 or better over the entire band. It literally looked like a cactus and had some variations including 1. However, I have built more than six of these antennas and can attest to the great performance. Hdtv For Sale. Technically, the Pockrus™ J-pole Joystick™ antenna is a dual-band (2 meters and 70 cm) open-stub, half-wave J-pole antenna. 2m/70cm Dual Band J-Pole by KK4ICE. 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. 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. 2 dbi) and stealthy appearance (paint it the. Most of us oldtimers will remember this wire as the twinlead used to connect a TV to the roof-mounted antenna that almost all homes in this country dis- played before the advent of cable TV. Gain is a number, performance is a reality. The J-Pole antenna is fundamentally an end-fed 1/2-wavelength antenna that uses a 1/4-wavelength long transformer section to supply the very high feed voltage. One of which was a dual band Tape Measure J-Pole. If you are interested in a copy, send me an e-mail!. It does not need a ground plane, radials or a complicated matching system. It fits in the top of the box. Simone IW5EDI. Comparing a typical 'J'-pole to a 1/4 wave or some sort of vertical array is an apples/oranges thingy. My workshop under the garage needed to have a separate antenna, preferably hung from a nearby tree. When done, the antenna should also present 1:1. this is the best dual band j-pole ever built. Got a question? Great, use my contact form to ask away. Details BoostWaves Premium HDTV Digital Outdoor Antenna Rotation High Band Super Long Range Buy. As a new ham, I was looking for a portable antenna. Since I had a Metal Fabrication background, I th…. J Pole Antenna for 2 Meters: This is a quick video of a simple J Pole antenna build for 2 meters. Antenna building skills are a must. A DISCUSSION OF ANTENNA THEORY by Paul Graham (K9ERG) J Pole Calculator and drawing by K4ABT G. I was asked if the Slovakian man who made antennas made a J-Pole for the 2m/70cm band that could be used maybe on PMR 446 MHz. I have a 3D 2 meter folded loop antenna, 1. Since I had a Metal Fabrication background, I thought this would be an easy build. Reports in the field say this J-Pole antenna outperforms antennas such as the a Ringo Ranger. As a vertical radiator, it has a flatttened-donut omnidirectional pattern, sending a radio signal exhibiting a gain of about 2. 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. We see many claims of dual band performance sold on the internet but when we purchased many of these antennas they are just VHF antennas that also resonate at UHF. third harmonic is poor when the antenna is The A Portable J. Yes you are right, the J pole is in plain view right under their noses. Don Murray W9VE Building a Dual-Band Antenna Mentorfest 10/23/04 7 Impedances along J-Pole Matching Stub (This part does the work of radiating) (This part does the work of matching the line to the dipole so that it can do its work. My experience is that they may reduce your SWRs & make a more forgiving antenna - but this could be bad & good - so do a little research. J-Pole Antennas are still Cool. Ed Fong (WB6IQN) on eBay. Diagrams 300 Ohm twin-lead. See Description. 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. 2/70CM “J” PORTABLE ANTENNA Plus a novel base support by N6JSX. Omni directional antennas provide 360 degree coverage in a donut shaped radiation pattern: Providing the widest possible signal coverage for indoor and outdoor wireless applications: Types of omni directional antennas include dipole ("rubber duck") antennas that. Modified Aluminum Dual Band J Pole ('Arrow') Antenna for Fiberglass Body Mini RV By KK6VLV. I use a CB SWR meter to check 2M antennas all the time. You really need to make the mast connection to the J pole non-conductive. Dual Band: works well on the 440-450MHz - 70cm band for great dual band performance. ) This is an excellent performing J-Pole type antenna, constructed from readily available materials. The basic configuration of the ribbon. 144-430 portable j-pole antenna A portable dual band j-pole antenna 2 Meter J-pole from 450-Ohm Ladder Line Great first time J-pole project. In addition, a link to the QST article is included near the bottom of this page. Universal J Pole. Arrow Dual Band J-Pole - 2-Piece Ele OSJ146/440 ELC 5. The antenna has a low SWR (less than 1. - $30 DBJ-2 (commercial) dual band roll up antenna kit - (152-157 MHz and 460-470 MHz). I use a CB SWR meter to check 2M antennas all the time. Lots of nice diagrams. They can be 3 or 4 sided and polarization can be changed depending on how they are fed. Rated 5 out of 5 by Cash from Just put up this antenna over the weekend. 6:1 or less VSWR and 420 to 450 Mc. Sony Xbr65a1e 65" Oled 4k + Hdr + Dolby Ultra Hdtv W/1 Year Warranty+ Fast Ship!. by Al Peter, AC8GY. com Copper J-Pole Antennas by dxzone. Although traditional VHF J-pole antennas will resonate at UHF, they suffer a -6dB loss at UHF over a ¼ wavelength groundplane. All of my antennas are designed by me, built, tuned and tested by me. If you're like me, you like to save some money. References. In my design I use 1/2" copper schedule M tubing and 1/4" soft copper tubing. collinear antenna 450 mhz schematic. ) This is an excellent performing J-Pole type antenna, constructed from readily available materials. I have had this antenna on my roof since 1992 and it has been problem-free in the San Francisco fog. The J-Pole has an added advantage that tuning can be varied over a fairly wide frequency range by moving the feed-point location up or down. The "super" j-pole is a co-phased 1/2-wave over 1/2 wave, and can perform accordingly, but as with all j-pole designs, has an irregular radiation pattern. 3 db gain (140-174), 5 db gain (420-500) over stock. Dual Band VHF / UHF Gain Base Station Antenna ANLI A-100 Amateur Radio. The first one describes the antenna and has a link to the 2007 article and the second is ordering information. J-Pole Antenna Plans (these files are now located on our web server) Dual Band Jpole. 73 N4Zq Here's an extract from one from my WWW pages (with a copy of the linked page). 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 3-meters (FM broadcast band) it is probably the antenna that is the best solution for many micro power radio stations. There are three connection possibilities to feed the multi-band copper cactus antenna with a single feedline or coax. Arrow Dual-band J-Pole. Also includes a 6 ft extension cable. Popular 2-meter band & Antenna videos 190 videos; The original Ed Fong Dual Band VHF/UHF 70cm/2m J-Pole PVC Pipe Antenna : Eye-On-Stuff by Eye-On-Stuff. Now I am keeping my fingers crossed that the HOA will not raise an eyebrow with my current set up. Dual band jpole | KB9VBR J-Pole Antennas. 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. Jeffrey NT1K. Performance is equal to a J-pole, but it’s smaller, less obtrusive and more. Has anyone constructed a Dual Band (144/440) J Pole antenna, that they could supply the materials and dimensions used. The other two corners show the effect of just a single feature in place. The ubiquitous dual band j-Pole antenna, the SE-DBj covers 144 to 146 Mc. Ed Fong's daughter dis- plays his famous 2M/440 Dual Band J-PoIe antenna atop his residence in Sunny- vale, CA. WiFi Antennas: How To Choose / Application Examples The two main categories of WiFi antennas are omni directional and directional. I built one of these using the dimensions from the American Radio Relay League (ARRL. com J-Pole dimension calculator for different frequencies at mJw. Heavy Duty construction that allows 80 MPH wind survival with 1/2" radial ice. 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. Details about 2 Meter 70cm Dual Band J Pole Antenna 144/ 440 Mhz Ham Radio With Weather Boot. Just Google "twin lead j-pole" and you'll find several good articles on how to construct one (which takes about 30 minutes). It is fed with 45 ft of LMR400. The antenna is tuned by sliding it up or down in relation to the mount and straps.