It is a vertically polarized antenna with two elements: a ¾ wavelength radiator and a ¼ wavelength matching stub. The jumper line between the antenna and hard-line is shot and I will have to wait to spring to replace. Aviation fans prefer this antenna as it works well picking up both land based and airborne transmitters. Check out my blog at www. Antenna Testing, Home Built, simple J-Poles Aim: To save you reading this test: - build a simple ¼ wave spider as I found that 95 times out of a 100 it will outperform a simple J-Pole. The toy-grade Radio Controlled devices can be available at a cheap rate in almost every retail store The Ground Plane Antenna Calculator j pole antenna - Google Search See more. It is an outstanding performer, especially when you get it up in the air. I had my Dad's antenna analyzer and found it works really well. Ham Radio 2m Backpack Quad Antenna. They’re simple to build, and using my favorite set of plans, the SWR in the repeater portion of the band has always been 1. Hf Radio Dipole Antenna Radios Long Distance Radio Amateur Ham Radio Antenna Radio Stations Diy Electronics Electronics Projects Building a Dual Band / 70 cm J-Pole Antenna Tim Wenzig. My workshop under the garage needed to have a separate antenna, preferably hung from a nearby tree. 75 / Freq in Mhz = length in meters of the ideal 5/8th's antenna. 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. Roll-up and go with a portable slim jim antenna. General information and calculator. The DBJ-1: A VHF-UHF Dual-Band J-Pole - Bay-Net The DBJ-1: A VHF-UHF Dual-Band J-Pole 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. Over on our store we've recently released our new receive only dipole antenna kit which now replaces the older magnetic whip style antennas from the previous kit. These are very easy to make or buy off of E-bay. You can find a range of affordable J-pole antennas with different features when you shop on eBay. the SIMPLE 2m/440 Copper pipe "J" by Dale “Kuby” Kubichek, N6JSX 03/2001&2008 Can you use a pipe cutter or a hack saw, can you solder – then here is how to build a SIMPLE ”J” antenna that will more than double your 2 meter (and even 440) performance! The "J" antenna goes back many years, long before I became a ham. I plan on using 3/4" copper pipe. Shop our selection of long-range base station CB antennas from Solarcon, Maco and Firestik. The TV Antenna Bundle Includes the Antenna with built in 36 dB gain amplifier, the motor rotor, J-Pole to mount it on and 40 feet of Coaxial Cable. Click Votes Antennas J-POLE; 2m-70cm antennas super jpole, VE3ELB: 440 Mhz J-Pole Antennans, WB8ERJ. 19" J-Pole Antenna MountVersatile all-in-one mount that can be used with antennas or satellite dishes. 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. The Dual-Band Open-Stub J-Pole Antenna. The other antenna in the picture is the J-pole tuned for the 2m amateur band at 144-148MHz. • The antenna shall be supported from a single point at its center. As many attest, there is an advantage when vertically combining 1/2 radiating sections to have a bit of separation between the half-wave end points. The antenna is sturdy, portable, and will give you modest gain on this popular band. J- Pole We will publish a number of antenna designs here, these have all been submitted to our forum by our forum members, most notably NormB in his best days. DIY Indoor/Outdoor TV Antenna Extension. There’s more to it. Feedpoint and testing must wait until next week. Install 70cm stubs on the 2m antenna to create a good UHF radiation pattern. he twinlead J-pole antenna has been around for quite some time. Hamuniverse. The J-pole is typically one of the first antenna designs an aspiring homebrew-ham attempts. While there is no problem working the vari- ous repeaters around town with my 1/4 wave antenna, simplex operation left a lot to be desired, so I felt something with a little more gain was necessary. Here's the straight scoop on WHY the J-pole is NOT an easy antenna to duplicate! Just to make my position on the J-pole clear, I hate them. Not only do J-Poles work for 2 Meter VHF, they also work for 70 Centimeter UHF. In many cases, I encourage groups to go ahead and put up a short pole now, and wait for the big tall tower until later. J-Pole Antenna, tuned for 155MHz, Works great and can be build for under UD$20. The Super J-Pole Antenna(Collinear Design) Below is a Javascript for calculating the lengths of tubing to be used for the construction of a Super J-Pole. The information is still useful to familiarize members with the antenna in preparation for the build. J-pole Antenna - Everybody says keep one in your bag, nobody seems to make one work right. You need to go read the articles here before you decide that the J-pole is the antenna for you. 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 / F5VIF Quick and Simple 2 Meter Ground Plane Project Via HamUniverse 2M Yagis. 2 Meter J-Pole Antenna This is perhaps the cheapest gain antenna for 2 meters that can be built. DISCLAIMER: Any links provided are for the reader's enjoyment. 20 Meter Delta Loop Antenna. For example, confuses this antenna with Zepp antenna, an end-fed wire antenna, which J-pole may have its conceptual origin but they are not the same thing. J-Pole antenna is an end-fed omnidirectional antenna that should be fed with 50-ohm impedance balanced line. Personally, I think there are some misnomers out there about what these antenna are and can do. SWR should be < 1. 2M Aluminum Slim Jim Antenna. ground plane antenna, it doesn’t need ground The DBJ-2: A Portable VHF-UHF Roll-Up J-pole Antenna for Public Service 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 replicate, “roll-up” portable antenna. Gray weatherproof coating. The J-Pole makes a great base station and emcomm emergency communications amateur radio and scanner antenna. I have jumped on the “cut the cable cord” bandwagon and now use an indoor/outdoor antenna to pick up digital TV signals. In the article Ed specifically says to use Schedule 200 PVC pipe. Notes: The J-pole antenna is a half wave radiator fed by an included 1/4 wave matching section. The simple list of materials includes RG-58 type coax cable, some 300 ohm twin lead, a BNC connector, and some solder. important because if the mast extends above the antenna ground plane it will affect the performance of the antenna. 2m/70cm Dual Band J-Pole by KK4ICE. This is an excellent opportunity for the members of SARC to build a quality J pole antenna at a minimum cost and I am sure you will want to take advantage of this offer. They’re simple to build, and using my favorite set of plans, the SWR in the repeater portion of the band has always been 1. J POLE ANTENNA DESIGN CALCULATOR by K4ABT. DBJ-2 Portable roll up antenna Why buy from imitators? This antenna was featured in the March 2007 QST and designed by Dr. Total cost for this antenna is under $10 (excluding coax) and it can be built in about an hour. The J-POLE antenna is a quick and easy plumbers delight. See the eham reviews at this link. 02 KB Web Pages on Packet Radio. The J-Pole antenna is much more popular on VHF Because it ends up being a long antenna on HF , it isnt all that popular However , on the 11m band , the J-Pole still has a managable length = 27 feet. The dimensions vary somewhat from build to build depending on velocity factor of the parts. 2m Copper J Pole antenna. txt) or read online for free. A 2-Meter Vertical Dipole Array, KG4JJH Page 1 of 6 A 2-Meter Vertical Dipole Array Build this 2 or 4-Element VHF repeater antenna with up to 9. Halos are normally horizontally polarized. The including mounting accessories enable you to install easily and Its adjustable angle base pivots to. This antenna works as well as any end half wave antenna for the CB band. MFJs exclusive IntelliTuner, Adaptive Search and InstantRecall algorithms. , with a VSWR of 1. enclosed collinear If the antenna is to be used outdoors, the end caps should be glued on with appropriate conduit glue, to ensure a weather-proof seal. In order to increase the bandwidth and to provide proper phasing of the currents in the. Handmade Slim Jim Antenna's by N9TAX Let me start by saying that since discovering the slim jim antenna design I have really come to respect these antennas. J-Pole antenna is pretty easy to build and usually designed by amateur radio operators. This sketch shows a semi-exploded view of the antenna. 95663265306 meters, or 95. Cantennas are typically used to increase the range (or discovery) of Wi-Fi networks. How does the J-Pole work? I don't know, but the below video is of someone that seems sure of themselves (hi hi). 1 dbi, depending on who you wish to listen to. and 38" J-Pole Antenna Mount Prices in USA. The MFJ-993B IntelliTuner lets you tune any antenna automatically balanced or unbalanced -- ultra fast. Parts Needed. J POLE ANTENNA DESIGN CALCULATOR by K4ABT. Ed Fong WB6IQN. The J-pole I replaced at node K4ABT -7, alias 007 has increased the average signal at fifteen (15) miles by more than 5 db; ENOUGH SAID!. Look online for a J-Pole calculator, there are several good ones. A friend of mine (KC0UYK) convinced me I should build this antenna and I'm certainly glad he talked me into it. This is the antenna build we demonstrated at the November, 2017 General Membership Meeting. bandwidth); and 420 to 450 Mc. Radio Shack # 21-961 3/8"-24/SO239 Mount (Mobile CB Antenna). I use two pieces of semirigid. The J-pole and other end-fed Hertz antennas are prime examples of antenna that can have severe feed line common mode current problems. txt) or read online for free. It basically involves building a “roll-up” type two meter “J Pole” using 300 ohm TV twin lead and then inserting it into a length of 1/2 inch PVC tubing. Dual Band (2 Meter/70 cm) Solid Aluminum J-Pole. SWR should be < 1. Copper Cactus Dual-Band Super J-Pole Antenna Project. A touch of Class, The Windom and the J-POLE By Glynn E. The Super-J has very little separation between the two half-wave radiators. 6-80 Meter HD-FMJ portable HF antenna. The J-pole antenna, more properly known as the J antenna, was first invented by Hans Beggerow in 1909 for use in Zeppelin airships. Slim Jim and J-Pole calculator by John M3UKD. Copper has an extremely…. 2 Bit J-pole project Dave Prince WB0RAZ. Simplified 2 Meter J-Pole (pdf) Michael Martens KB9VBR. A J-Pole Antenna for the 220Mhz Amateur band. txt) or read online for free. This sketch shows a semi-exploded view of the antenna. J Pole Antenna for 2 Meters More on the J-pole Antenna (#163). com Here a collection of links to make you own dual band VHF UHF copper cactus antenna. Using a TDX-ONE TD-Q8A at full power fed into a 2 Meter J-Pole (held in my hand) of the same design as pictured, I can get into the 442. Kronberg | May/June. Here's a PDF instructional on how to build a folding/backpackable rigid copper J-pole antenna that is held together by a bungee. because it is based on Review of many people, the product is easy to use, high quality material. 100 WI9WIN UHF Repeater 50 Miles away in Rice Lake Wisconsin. J-poles are not built to be attached to metal masts, and they HAVE to be fed through a choke at the feedpoint to work properly. How does the J-Pole work? I don’t know, but the below video is of someone that seems sure of themselves (hi hi). It must be placed as high as possible, properlymatched to the transmitter, and designed to effectively radiate the powerapplied to it. Watch Free HDTV with this Outdoor TV Antenna Bundle Kit. Visit the original J-Pole Antenna Store. Military AS-2259/GR There are a number of different NVIS antenna plans on the internet that can be adopted to amateur radio use. This sketch shows a semi-exploded view of the antenna. The simple list of materials includes RG-58 type coax cable, some 300 ohm twin lead, a BNC connector, and some solder. For very small number of readers, I am sorry, it’s been a long time I’ve written anything for this blog. A Simple 2-meter copper pipe "J" pole; Tape Measure Yagi. One the picture below I have used the silver one for the balun (4 turns not touching, size not too important). Performance is equal to a J-pole, but it’s smaller, less obtrusive and more. "Buck" Rogers Sr (68 years as K4ABT) The J-POLE has been around since the early days of HAM Radio, and is a direct descendant of the "Windom" Like the Windom or ZEPP, the J-POLE is a spin-off, or a modified WINDOM for VHF and UHF. – Durable and low wind load design with Anti-UV coating and waterproof kit, suitable for outdoor or mobile use (camping, boating, etc. 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. The Q of a antenna determines it's bandwidth. At the base, a quarter wave matching stub forms the classic 'J Shape'. Figure 2--This EZNEC plot shows the difference in the. Want a Good Microwave Antenna-Drink More Coffee. 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. Building a Simple J-Pole from 3/4" EMT Conduit. There is a piece of 2x4 inside, angled at. DISCLAIMER: Any links provided are for the reader's enjoyment. There's more to it. It must be placed as high as possible, properlymatched to the transmitter, and designed to effectively radiate the powerapplied to it. When mobile, I installed a Tram 1185 mag-mount antenna (which also works well, especially with the new FTM-100DR!). The 2m/440 Super J-Pole. Receiver Overload. Later I might make a build video of how to make an antenna like this so make sure you subscribe to my blog and Youtube channel so you don't miss it. The 154MHZ antenna out performs the 850 antenna in every band tested so far. If you watch closely, you can divide the J-pole in two pieces. My thanks to Peter, VK2EMU, who manufactured a few J-Pole antennas for 6m. because it is based on Review of many people, the product is easy to use, high quality material. This month I decided to build a 2 meter 5/4 wave antenna. Build Your Own Antenna Analyser for under $50 Beric Dunn K6BEZ. Using a TDX-ONE TD-Q8A at full power fed into a 2 Meter J-Pole (held in my hand) of the same design as pictured, I can get into the 442. Essentially, this is no more than a length of copper pipe folded back on itself with the feeder connected across the fold, a short distance away. Building a Simple J-Pole from 3/4" EMT Conduit. Ruggedly constructed one piece design, this J-Pole antenna will last practically forever. I built mine from 3/4. The J-pole is typically one of the first antenna designs an aspiring homebrew-ham attempts. What I use for a "Deep Woods" antenna is a "Roll-up" J-pole made from 300 ohm twin-lead TV antenna wire. Here you shall find the info to build a 144 MHz to 146 MHz J-pole type vertical antenna. Homemade gin pole I used two 6’ long 2x2’s. Basically all that is really required is a good swr meter designed for the bands you are building your J Pole antenna and some basic soldering skills. The Super-J has very little separation between the two half-wave radiators. Pole and Metal Stays In locations with weak Digital TV signals it may be necessary to use a larger antenna with higher wind loads or a high pole to get better signal. Parts needed 10 ft of ½ copper pipe (3) “T” Fittings (3) M to F 90 degree elbow fittings (1) reducing fitting (3) feed lines of 50 ohm coax V. Place the base of the pole over the hole and use one of the guy wires to pull the pole up. Dual Band VHF/UHF Slim Jim Antenna. It is a vertically polarized antenna with two elements: a ¾ wavelength radiator and a ¼ wavelength matching stub. What can I do? A: Try adding a balun to the coax. J-pole Antenna. J-Pole antenna is pretty easy to build and usually designed by amateur radio operators. YOURSELF ! Note: I don’t know the originator of this clever adaptation so I cannot provide any acknowledgement. The quarter-wavelength, ground plane antenna is made up of one vertical element, called the driven element, and four radials. Build a Weatherproof PVC J-Pole Antenna By Dennis Blanchard, KIYPP 143 East Rd Hampstead, NH 03841 After you've built this antenna, you may not need anything else. Kronberg | May/June. 6-80 Meter HD-FMJ portable HF antenna. Then I cut and bent a shorter piece to specs. Plus the antenna also have the great low noise floor and wide bandwidth typical of our other antennas. Here is a picture of the antenna mounted on the new mast. I'm trying to build a wave "Coaxial J-Pole" antenna, similar to what is described here: Such an antenna would be great for stringing up in a tree when operating remotely, no tuner needed. Super J Pole - 2 Meter Antenna Construction 144mhz-148mhz: Here is a simple Javascript calculator for determining the lengths of tubing to be used for the construction of a Super J-Pole Collinear Design. Some swear by it but I am sorry , I have never heard one that worked that well. I know that starting with a j-pole is simple and easy. A J-Pole is really a radiating feed line and thus can be fed on either side of the 1/4 wave stub. The Super-J has very little separation between the two half-wave radiators. It works very well as a multiband antenna indoors. This sketch shows a semi-exploded view of the antenna. I have built many 2m J-poles. You can also build a roll up J-Pole out of ladder line when you go portable. It does not hurt you to try or buy 38" J-Pole Antenna Mount. The first two above are probably the best for the beginner and the more advanced, but not technically minded. J-Pole antenna is an end-fed omnidirectional antenna that should be fed with 50-ohm impedance balanced line. , with a VSWR of 1. I give this pole a lot of credit I am able to get great distance and range on the 2 meter band. Are you looking for a UHF omni antenna with a little more gain? 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. Cheap and Dirty CB Base Antenna you can build in an hour. Building Suggestions. It uses cell phone technology to receive and tune stations. A J-Pole is really a radiating feed line and thus can be fed on either side of the 1/4 wave stub. At this point you have a functional antenna if you don't live far from the transmission source this antenna might be good enough to use but if you need an extra boost you can build a reflector. A search for 2 meter J-pole or VHF J-pole will turn up a lot of amateur/ham antenna designs, just shorten the lengths to 146 MHz / 159 MHz (0. Personally, I think there are some misnomers out there about what these antenna are and can do. Compact Hybrid antenna 2 Meters, 75 and 23 cms; Portable Cuad antenna 2 Meters - (QST 9-80) 2M/440 MHz Dual Band Copper J-Pole From N7QVC; 2M Fan Antenna (Yes From an Electrical fan). When rolled up, it is an extremely compact, pocket-sized antenna. 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. The ARRL Antenna Book describes two common configurations of the J-Pole antenna: an open-stub version and a shorted-stub version. How does the J-Pole work? I don’t know, but the below video is of someone that seems sure of themselves (hi hi). How do you choose a J-pole antenna on eBay?. The top of the metal pole should not protrude significantly beyond the top of the metal mounting bracket, thus avoiding the creation of high SWRs. 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. AN ALL-COPPER 2-M J-POLE Rigid copper tubing, fittings and as-sorted hardware can be used to make a really rugged J-pole antenna for 2 m. I don't make them. Antenna Testing, Home Built, simple J-Poles Aim: To save you reading this test: - build a simple ¼ wave spider as I found that 95 times out of a 100 it will outperform a simple J-Pole. See the eham reviews at this link. Roll-up and go with a portable slim jim antenna. The aluminum J-Pole appeared to be harder to build of the two so I decided if it was harder to build the better it would be. It shall not employ rope to tether it. wanted plans: j-pole 440. The antenna I constructed was made of 1/2" tubing. Parts used found @ home depot, build time 1 hour k0bet, jpole, j-pole, super jpole, home brew jpole, diy jpole,. Cheap Yagi Antennas for VHF/UHF by Kent Britain, WA5VJB edited by John Maca, AB5SS [Editors notes: The antennas described in this article were built as the result of several discussions between Kent and a Cuban radio operator. 2 Meter J-Pole Antenna This is perhaps the cheapest gain antenna for 2 meters that can be built. because it is based on Review of many people, the product is easy to use, high quality material. In many cases, I encourage groups to go ahead and put up a short pole now, and wait for the big tall tower until later. by Al Peter, AC8GY. It also indicates that the J-pole has been popular in mobile applications, although it is not as widely used as the quarter-wave whip. We are proud to offer them a somewhat lower price. At this point you have a functional antenna if you don't live far from the transmission source this antenna might be good enough to use but if you need an extra boost you can build a reflector. Figure 2––This EZNEC plot shows View Full Source. The class is hands on. As I was setting up my amateur radio station, one requirement was for 2M and 70cm antennas in two locations. The airband J-Pole antenna is tuned for the 118 - 128 MHz aircraft aviation band. The dual dipole wires do the job of providing guying support for the mast. I saw the plans for this on the internet (link to plans) by Allen Lowe (N0IMW). If you watch closely, you can divide the J-pole in two pieces. The down side if a j pole is getting them rugged enough to stand up to wind and weather. "J " antenna is the fundamental correct designation. 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. The J-Pole is an excellent antenna for emergency communications. 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. 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. A 2 meter easy homebrew jpole antenna build - This Super jpole costs under 20 bucks - Hits repeaters 45 miles away. As we all know, the antenna is the most important partof any transmitter system. The top part of the main element was the 70-cm j-pole and was fed via coax through the main element. The J-Pole Antenna. The first antenna that you should consider building is the quarter-wave ground-plane antenna for the 2m band. 8 - Number 4 machine screws, star washers, and nuts. In this video, Matt Heere used an online J-Pole calculator and some "upcycled" copper plumbing pipe to make this sturdy, effective 2 meter antenna. DIY Building J-Pole Antenna. The pictures tell the story. HOWEVER - it is a lousy one antenna does all type antenna. was VERY excited on how the ground rod just sunk itself into the dirt! No sweat, no blisters, no hammering! I'm dokin on 11m cuz I gat no ticket. It can be built for any of the higher amateur bands and has a low angle of radiation. It is an outstanding performer, especially when you get it up in the air. My workshop under the garage needed to have a separate antenna, preferably hung from a nearby tree. Nov 19, 2017. • The antenna must be durable and secure. When fed with coax (whether it is an RG-58 or RG-8) cable, it should be connected with air-choked balun. 5 metres antenna is not like handling a 6 metres long one so, maybe it's better to stack another "little" antenna. Hence the switch to the J-Pole. Chameleon Emcomm III Portable HF Antenna review I added a video to a @YouTube playlist youtu. com Here a collection of links to make you own dual band VHF UHF copper cactus antenna. In the process, you'll discover that there were a number of things I didn't know when I made this video. Amazon's Choice for 30 foot antenna pole 6-24 Foot Telescopic Extension Pole - Multi Functional Pole, Paint Roller, Light Bulb Changer, Duster Pole, Antenna Pole, Hanging Lights, Window and Gutter Cleaning - Includes Free Feather Duster. Construction time is about 10 minutes once you have the needed pa. The correct method of attaching the coax is the live to the stub except for some super designs which are really dipoles next to the radiator. a longer J-pole in non-standard form does not yield the benefits of lengthening a vertical monopole over a buried ground plane. You may use a Fiberglas rod (arrow shaft) as an insulator, but you will have to be very careful with the torch or you may weaken or burn the rod, or make it brittle. The antenna has an omnidirectional pattern with a low take-off. RE: The SIMPLE 2m Copper 'J' Antenna "J Pole " is incorrect. On the left is a mini 850 MHZ antenna i put together to test a distant 800 Trunked system for reception. This page documents a build of a 2-element 1/2 wave collinear J-Pole performed by Harry, KC9EOT, and myself, KB8OJH. The Slot Cube The diminutive 10 x 10 x 7 inch 2-meter base-station antenna shown in Figure 1 has the omnidirectional gain of a J-pole, but it is more effi-cient. Here come the arguments as about half the designs attach to the. 4-1 at 144 &148 MHz. A friend of mine (KC0UYK) convinced me I should build this antenna and I'm certainly glad he talked me into it. During what turned out to be an extended tower-raising project (Going from 55 feet to 90 feet), I had my beam down and I needed an antenna that could provide the necessary gain and angle of radiation to talk to my friend Skip down at the South Pole. These are very easy to make or buy off of E-bay. Eric Dollard has improved upon the work of Tesla and Alexanderson in this science and has actually build a full scale working model that demonstrates the principles. bandwidth) using a single feedline. Visit the original J-Pole Antenna Store. It works very well as a multiband antenna indoors. I am not sure if it will make any difference using 3/4 copper over the 1/2 conduit. 52 MHz 146 MHz 446 MHz 915 MHz. The 2 Meter Collinear J Pole Antenna Projectby Sean M3FVB Get ready for field day, mountain topping, emergency communications, roaming or just plane ham radio fun with this portable inexpensive 2 meter J designed to fit into a small foldup space that yields about 8db gain. because it is based on Review of many people, the product is easy to use, high quality material. I was thinking about making a few variations. Heys These books are orientated towards the Shortwave Listener more so than the Ham operator. The J-Pole is an older antenna design that's been around a while, but not widely used or thought of these days. It shall not employ rope to tether it. New Dual-band Antenna for the HT. The J-Pole is an excellent antenna for emergency communications. ARPSC provides this material for. One positive point about the J-Pole is that its main radiating portion is high up in the middle of the top half wavelength section. I purchased this J-pole Antenna and decided to mount the antenna on a pole outside my house. They’re simple to build, and using my favorite set of plans, the SWR in the repeater portion of the band has always been 1. When mobile, I installed a Tram 1185 mag-mount antenna (which also works well, especially with the new FTM-100DR!). Here is a J-Pole made out of 3/4" conduit pipe and a dual gang electrical junction box. Are further improvements possible? By replacing the phasing stub with a simple coil, the answer is yes. DIY Dualband J-pole antenna Recently I was looking for a low budget antenna to use indoor just so I could monitor the local 2m and 70cm repeater. The copper j pole design seems to be easy enough to build. I saw the plans for this on the internet (link to plans) by Allen Lowe (N0IMW). 2 meter/440 “j” using cb whipn6jsx. in our opinion, this product is definitely very popular and very good in terms of quality. Building a Simple J-Pole from 3/4" EMT Conduit. The idea for the Parabolic Discone antenna came to me because "dish antennas" are best understood using the "ray" principle, like light. Making a Basic Slim Jim 2m Antenna The Slim Jim is probably one of the cheapest and easiest antennas to make, and it’s a very handy one too. 3 Antenna Compendium. While there are plenty of high performance antenna designs,. 300 ohm Twin-Lead J-Pole Antenna Design May 11, 2007 Rob Mavis - AE6GE The following is a description of a J-Pole antenna made from 300 ohm TV twin-lead. The J-Pole can be cheaply, simply and quickly constructed using a variety of techniques, some of which are discussed in this article. The class is hands on. 2-1 from 440 - 450 MHz. SWR should be < 1. I use a J Pole for air band (122 MHz). This month I decided to build a 2 meter 5/4 wave antenna. Hi! I need a J-Pole antenna to use with a Uniden 105XLT airband scanner. J-Pole antenna is pretty easy to build and usually designed by amateur radio operators. In technical terms, it is an end fed vertical 1/2 wave which is fed via a 1/4 wave matching stub. It can be used on either end of pipe for best mounting. Here a collection of links to make you own dual band VHF UHF copper cactus antenna. It is an ideal end-mounted, single-mast antenna. It shall not employ rope to tether it. J-ames Pole Antennas' can custom make a J-Pole antenna to your specifications. The antenna is manufactured from square aluminium tube, welded and with a perspex spacer at the top of the J. a bargeboard mount) with screws 75 Ohm shielded coaxial cable 6 bolts (very small, small and larger). 6 Meters - 'The Magic Band'. This calculator can be used to design a Slim Jim or a J Pole antenna. The RTL-SDR can be used to listen to. "J " antenna is the fundamental correct designation. Can be mounted on the roof, wall, chimney or any other flat surface. The antenna pole or "mast" was a old telescopic pole we had laying out in the back.