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J pole gain

J pole gain

DBJ - UHF +5dB Gain Antenna – US patent 8,947,313 +5dB gain no radial collinear – featured in CQ magazine (Summer 2012) $40 Accessories - please email or call so we know exactly the adapter you need. Here is the 2m side. When elevated it work because of better LOS communications, not because it is a good antenna. 5) that provides a gain of approximately 5 dBi. This antenna is also known as the “copper cactus” (because it kind of looks like one of course!). The matching stub provides an out of phase current which means that there is a cancelling field close to Jul 06, 2012 · 6 Meter amateur ham radio monoband antenna | KB9VBR J-Pole If you are a lover of 6 meters, then this antenna is for you. I went to the local lumberyard and hardware store (a home building supply will work, as well) A Backpacker’s Delight— The Folding J-Pole A new twist on the old J-pole. With a higher gain ground plane it is less sensitive to its installed environment ensuring stable communication at longer distances There are several features which make a Twinlead J-Pole antenna a good addition to your kit: • When rolled up, it is an extremely compact, pocket-sized antenn a. As I understand it, a J-pole is derived from nothing but an inverted Zeppelin-antenna. Includes PARAMETRIC SWEEP Analysis to investigate Performance as Feedpoint Height is varied and also as L1-L2 Separation is varied. My J-pole antenna is made with 1/2 inch copper pipe. Here come the arguments as about half the designs attach to the 60MHz Frequency Meter / Counter Frequency Meter / Counter measures frequency from 10Hz to 60MHz with 10Hz resolution. J-Pole antenna is pretty easy to build and usually designed by amateur radio operators. This is a 3/4 wavelength J-pole optimized using JSC 1220 custom twinlead. The antenna I constructed was made of 1/2" tubing. High Performance reliable collinear J pole design encased in durable fiberglass. 5:1 or less from 140 to 150 MHz. Michael Heiler, KA ØZLG As The J-Pole and the Slim Jim are both are essentially the same antenna. ” At 34 feet in length the unique design characteristics of your 6-160 Meter HF J-Pole Sr antenna enables it to achieve resonance on 15 & 20 Meters, and presents a SWR on all HF bands that is low enough for 3:1 tuners to achieve a perfect match. With twice the gain of a standard J-Pole antenna, the 2 meter Slim Jim antenna is a J-Pole on steroids!The 2 Meter Slim Jim antenna a great solution for repeater sites, data and packet stations, APRS, and even every day communications. 69 dBi for a 1/4wl ground plane). The increased capture aperture or gain for single radiating element increases as the radiating element length is increased until the length of the radiator exceeds the magical 5λ8 wave length at which point the increasing radiator length causes the radiation pattern to begin breaking up into a number lobes and nulls. There are times when you may need more gain than the standard J-Pole antenna. 1 dbi, depending on who you wish to listen to. 99 Scout Ks-10 Removable Vhf Fiberglass Antenna H22cm Base Ø6cm 66501067 Eur 66501 This page is broken 🙁 I’ve assigned my best minions to fix it up – KB3KAI Dimensions for a Pipe or Wire J-Pole. I'm interested in a wire gain antenna for 6m SSB, and the design above looks like a pretty quick project. Hopefully it will help dispel some of the myths in the j-pole community such as the SlimJim having a gain over the regular J, masts don't conduct current and other fictitious and misleading nonsense. Measurements and simulation confirm the quarter-wave stub modifies the circular H-plane pattern shape increasing the gain slightly on the side of the J stub element and reducing the gain slightly on the side opposite the J stub element. Well I just got done constructing my own jpole antenna for the first time I have wanting to build one of these for a while and since my 1/4 wave groundplane got broke from high winds a week ago I decided it is time to build a better antenna. 75 x 8. 23 dB gain over a dipole at the same height). The 2m/440 Super J-Pole . . Yes, you will have to add the cost of quality coax as you would with the most expensive antenna. When speaking in terms of antennas: Gain + dB = dBi of an antenna . Average gain with a 2 meter J-Pole is about 3 db. Slim Jim Antenna was designed by late Fred Judd. The fact that the Example: Bode Plot of Gain Term. BNC (female) to PL259 adapter - allows the DBJ-2 to adapt to most base and mobile radios. Heavy Duty construction that allows 80 MPH wind survival with 1/2" radial ice. Memang, Super-J tidak akan pernah mendekati keuntungan gain dari antena dua elemen yang benar dipisahkan collinear, tapi kita bisa lebih mendekati tujuan ini. This J Pole antenna design beats the quarter wave 'hands down'. It is an outstanding performer, especially when you get it up in the air. For that reason the pattern of the J-pole is slightly “bend”. This page documents a build of a 2-element 1/2 wave collinear J-Pole performed by Harry, KC9EOT, and myself, KB8OJH. J-pole with a 1 in. The 6 meter J-Pole is The 6 meter J-Pole features a two piece design for shipping and easy storage. J Pole antennas should give you about 3 dB gain over a monopole antenna. C ONSTRUCTION OF A N EW J-P OLE A NTENNA FOR 2m gain. Check out my Stacked-J for 2 meters. +3dBi Gain over a 1/4 wave I can't seem to find any data on what the radiation pattern of homemade J-pole antennas are. at 2. The principle of a J Pole is well understood, and basically involves feeding the upper part of the antenna (a half wave dipole) with the lower part of the antenna (a quarter wave matching stub). A collinear (or co-linear) antenna array is an array of dipole Free Online Engineering Calculator to quickly estimate the geometric Size of a J-Pole Antenna 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. 20. 2 dBi on 70 cm fairly equally in all directions parallel to the earth. The J-pole antenna is an end-fed omnidirectional half-wave antenna that is matched to the feedline by a quarter wave transmission line stub. It is a J-Pole on top of a J-Pole. Building J-Pole amateur radio antennas category is a curation of 85 web resources on , Concealed DSS J-Pole, The Copper Cactus J-Pole, J-Pole Antenna for your Packet Radio Station. Here we have a dual band slim jim that still has that great slim jim gain but allows operation on the 70cm band also. The 440 antenna exhibits a gain around 3 DB over a rubber duck. Many like to compare the gain and antenna pattern to that of a Ringo Ranger. 2 METER J-POLE ANTENNA This is perhaps the cheapest gain antenna for 2 meters that can be built. When rolled up, it is an extremely compact, pocket-sized an-tenna. Primarily a dipole, the J-pole antenna exhibits a mostly circular pattern in the H plane with an average free-space gain near 2. There are several different variants of J-pole antennas. J-Pole Antennas As of Feb 2019 I am now making only a few antennas for sale - $35 local pickup only, no shipping. Put inside a 40mm PVC pipe, it has no metal parts protruding and it's rather compact. It can receive all the TV signals of your area in VHF and UHF band, as well as the FM radio signal. The J pole is an end fed half wave via a 1/4 wave stub matching section, the ground plane is a 1/4 wave fed against a mirror image ground plane - a center fed 1/2 wave. The biggest advantage of the J-Pole is that it is at DC ground, so it Slim Jim Antenna Calculator. About SWR; My OSJ 146/440 J-Pole went through 3 hurricanes in 6 weeks, with gusts speeds, on occasion, as high as 153 MPH. The main current is about half-way up the free and clear dipole section. 2:1 or less VSWR. We fabricated two identical J-Poles using the dimensions in this document, and both of them performed quite well, with a resonant frequency toward the lower end of the 2-meter Amateur band and a VSWR of 1. The N9TAX Slim Jim antenna is the highest quality roll up antenna available today. Max Power 100 watts. 4dB over isotropic (a half-wave dipole is 2. UHF OR VHF with calculator. The gain can affect the direction in which the antenna operates. Mostly due to the fact that the angle of radiation is lower, not because of gain in the isotropic sense. The J-Pole antenna of claim 15, wherein the shunt segment, the radiating antenna segment, and the matching segment are all positioned on a common side of the feed line connector and the ground line connector. In use, it makes for a very effective antenna and provides about 3 db of gain with a low take-off angle. Please try again later. GG: može prilagođenje sa Pi filterom, ali se tada gubi ono"J" iz naslova (HI!) Leone: nema usmjerenosti, ali ako ste rotiranjem osjetili promjenu onda je antena bila sigutno dobro spregnuta sa stupom HI! Here it is set up in the garden for testing on 145. Is this a 1090-mutability vs 1090-FA thing or is my little j-pole working significantly better than the Flight Aware aerial? I’ve set up some port forwarding so people can see the difference. A peak gain of the pattern can be expected around 2,4 dBi. Jul 22, 2015 · This feature is not available right now. Email to inquire. The antenna appears to be a type of center-fed collinear but does not require any sort of matching hardware when fed with 50 ohm coax. A question on other dimensions: Does anyone out there have a Ringo Ranger cut for RR freqs? I have a spare one around but no longer have my measurement sheets and would like to tune it for around 161 mHz. approximately 2 dB less gain in the hori-zontal plane compared to a J-Pole operat-ing at its fundamental frequency. From St. Enjoy 100's of TV Shows in HD for Free. There are several features which make the ubiquitous Twinlead J-Pole antenna a good addition to your emergency grab-n-go kit. Ne slažem se da je J pole 3/4-lamda radijator. He was getting some rather strange performance from this design, so I asked him where or how he had come up with the antennas dimensions. Number 8 solid copper ground wire is an easy to find source for element material. Shown with and Requires FM2 Mounting Hardware. Sep 14, 2015 · A Super J-Pole Antenna for the 70Mhz (4m) Amateur band. Folded J-Pole antennas, or Slim Jim antennas can be stacked and fed with phasing harnesses for gain as well. Analysis for other L1, L2 Lengths to be provided in a separate Album. Some swear by it but I am sorry , I have never heard one that worked that well. 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. This second one has a threaded section in the middle of the long element to allow disassembly, and easier transport (see picture album). I have two 2-meter antennas, a copper J-Pole and a Hy-Gain VB-25FM. Resources listed under J Pole category belongs to Antennas main collection, and get reviewed and rated by amateur radio operators. For now the basics of the j-pole antenna are well documented. The antenna can be built for any band. Mar 29, 2007 · Copper Dual-Band Super J-Pole Antenna Project. 26" Long. But as a Zepp-antenna it does not need any ground just like ordinary dipoles don't. Package Size: 7. with an approximate gain of 6. The PRO-SERIES line reinforces that fact. It is likely that any real world tests that show the Slim Jim to have better low angle gain than the J Pole is due to the (sometimes) poor way people tend to mount the J Pole by grounding the base to a mast or not choking the feedpont, as opposed to the Slim Jim usually being mounted freely. Since a J-pole is not end fed, there is less ground reflection and ground capacitance than there is with an antenna like an A99 or similar. 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. Eznec Battle. Free shipping and Money Back Guarantee Sep 14, 2015 · A Super J-Pole Antenna for the 70Mhz (4m) Amateur band. Jul 19, 2017 · Despite running gain optimisation on the new setup, the original is is receiving a LOT more. 3 to 1 over a 6 MHz bandwidth and less than 1. Louis County, MO I could reach both UMR (Rolla) and UofC (Columbia) repeaters on the Stacked-J at 30 watts, a little noisy on 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. +3dBi Gain over a 1/4 wave It is likely that any real world tests that show the Slim Jim to have better low angle gain than the J Pole is due to the (sometimes) poor way people tend to mount the J Pole by grounding the base to a mast or not choking the feedpont, as opposed to the Slim Jim usually being mounted freely. 5:1 or less from 133 to 175 MHZ according to my analyzer. No damage at all, and it kept right on ticking. zenom October 27, 2016, 4:40pm #15 Just switching from the small antenna or the 2m J-Pole to the Flightware antenna, I went up to 600+ msgs sec. You could take a 3/4 wavelength of wire attached to the center conductor of the coax, then a 1/4 wavelength of wire running parallel to that connected to the braid of the coax, then short the two together at different points along the 1/4 wave section until it matches. The matching stub illuminates the need for a coil (loss) and can handle immense high powers. For folks new to ham radio or radio in general J pole antenna (More **here**)Ed Fong (WB6IQN) is well known on the West Coast and legend in the Bay area. The elements are attached via silver brazing. The J-Pole antenna is a 1/2 wave antenna with a 1/4 wave matching stub. The effect is the same as placing a ground-plane monopole at a 1/2-wavelength height in terms of added signal strength. com shows field charts for J-Poles with small differences in build where the low angle gain can vary by 5dB. 38 dBi or 4. Trailed behind the airship, it consisted of a single element, one half wavelength long radiator with a quarter wave parallel feedline tuning stub. At the base, a quarter wave matching stub forms the classic ‘J Shape’. 23 dBd (4. Mar 31, 2014 · Ive tried the collinear, tried a discone. Yes, I know and understand they will all vary, but some rudimentary data would be nice. . 5 :1 over 10 MHz bandwidth. It is a unity gain antenna at best. The 3dB Gain Omni-Directional Antenna – Model 7110-00 is a 3dB base matched ½ wave vertical J-pole antenna fed at the end through a quarter wave shorted  E-plane gain measurements of J antenna with respect Primarily a dipole, the J- pole antenna exhibits a mostly  Gain: 2. - HIGH GAIN, more than J-pole or Comet - WIDE BAND no-tune operation - Easy to assemble/disassemble (15 minutes) - Better range than omnidirectional antennas (Comet or J-pole) - Attractive price Check or purchase PCS0205 and other antennas here. May 28, 2016 · Some web sites suggest the Super-J has a full 3 dB gain over the plain J-Pole which is a pretentious claim obvious to anyone with a copy of the ARRL Antenna Book and other references[1]. Dec 28, 2010 · 18. Jun 12, 2007 · 2 Meter J-Pole Antenna This is perhaps the cheapest gain antenna for 2 meters that can be built. The J-Pole is my all-around antenna, what I use for general 2 meter stuff like connecting to my local repeaters using my main 2-m The online resource for the J-pole dimensions is excellent. Antenna design calculators, J-Pole Antenna Design Super J-Pole This calculator can also be used to make the J-Pole: Theoretical maximum gain and bandwidth of Theoretical gain is about 13 dBi. One of these days, I'll make a J Pole antenna for 20 meters. 6 dBi on 2 meters and about 5. The ¼ wave stub cancels out ¼ wavelength of the ¾ wavelength radiator, thus leaving ½ wavelength to radiate. the "dB/ham radio gain," which is 6dB higher than the real one. The J-Pole does not require any ground radials and has a antenna gain of 2. 2 dBi (0. This VHF/UHF rig is relatively inexpensive, compact and fairly useful for local communication via repeater or simplex operation. It’s not as high when compared to the claims of large scale antenna manufacturers but considering the materials used, ease of assembly and use, I think this is a really good antenna. Calculated as follows: 6. The J-Pole antenna of claim 15, wherein the J-Pole antenna is for use as a radiating element in a wireless communication network. dBd gain for the reasons why Arrow Antenna doesn't want to talk about it. The 1/4 wave whip, a Marconi antenna, is really one-half of a half-wavelength antenna fed at its center, its low-impedance point. The J pole has a quarterwave matching stub. My current 2 meter antenna is a 1/2" copper tubing "slim Jim". The idea of a folding version of the copper antenna appealed to me. 85%-90% of the DMR repeaters in the USA are UHF, and since this antenna carries a 4db gain, it makes a perfect base antenna for your DMR setup. If constructed properly, it should give around 3 dB gain over a regular J-pole. 2m/70cm Dual Band J-Pole by KK4ICE . An omnidirectional pattern was desired. It is a simple, inexpensive antenna, and this specific antenna stands about 60 inches high. 4 dbi (1/2 wave dipole) to 5. Michael Heiler, KA ØZLG As The J-Pole has the same gain as the Ringo (3. Measuring up the tried and tested 1/4 wave ground plane antenna against a folded j-pole design. 1dB gain over isotropic). In essence the J-pole is a halve wave radiator with a quarter wave matching stub underneath the antenna. 2,32 3el CTE spitfire; 3,60 DXbeam; 5,40 5el WULF; 9,35 MACO 106 C; J-Pole Dutch Mostly due to the fact that the angle of radiation is lower, not because of gain in the isotropic sense. The antenna I used for my a mobile device was a super J-pole antenna. A J-pole is also a 1/2 wave antenna that is end-fed, and also has a gain of N dbi. ALL have a maximum gain of 2,4 dBI. Aug 28, 2019 · A J-pole is a 1/2 wavelength radiator with a 1/4 wave shorted stub for matching. I don't know the difference in gain, but in comparison to a regular J-Pole on the same mast, the Stacked-J outperformed it hands down. Both are a unity gain vertical radiator, a single 1/2 wave. We fabricate this antenna using 3/16-inch diameter solid stainless steel. Therefore it also has a gain of N dbi. This mate-rial came from an article by Michael Hood, Calculate your own Antenna Gain! More than ten years ago a humorous article on antenna gain was published in the ham radio magazine "QRV. Total cost for this antenna is under $10 (excluding coax) and it can be built in about an hour. Sep 15, 2009 · The basic J-Pole has a gain comparable to a dipole - about 2. Hello everyone, Well, I'm about in a position I'm getting ready to make some upgrades to the station down here in the Nov 10, 2014 · The gain of the humble quarter wave ground plane is a tiny 0. Unfortunately, the feed point impedance was 17. Mar 28, 2018 · I was so pleased with my results that I purchased enough materials to construct another J-Pole for portable use. Apr 24, 2017 · I've made a few J Pole antennas over the past few years, and they work great on the VHF and UHF bands. Dia; Perfect for All outdoor antennas, satellite dishes and security cameras 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. It is the best solution for home reception and digital portable TV reception. My name is Michael, KB9VBR, and I carry a full line of VHF and UHF antennas for sale. 1 dBd). Dec 11, 2018 · Posts about J-Pole written by AF5NP. Premium quality J-Mount Style in Black. That should be an interesting project. Start Watching Live TV with No Monthly Fees. This antenna has a surprisingly broad bandwidth, giving a VSWR of 1. Thanks to us, you can get access to the best digital outdoor antennas black Friday deals of 2019! Shop a bunch of outdoor digital tv antenna on sale on the internet. Hence the switch to the J-Pole. J-pole Antenna Revisited Yet Again I recently had a conversation on the radio with another Ham who had built a 6 Meter wavelength band "J" antenna. Also, minimal skyward radiation and minimal radiation back to the building on which the antenna is installed was a requirement. J-Pole or Slim-Jim? Need advice on one or both. Weight: 10 Ounces. They have almost no gain and copper is getting expensive these days. Gain koji se očituje je posljedica većega zračenja ka horizontu, dakle prividni gain. The Super J-pole has a fairly narrow impedance bandwidth, ranging from 3. The PRO-SERIES VHF j-pole is an antenna with both a solid gain value as well as extraordinary bandwidth, all in one package. There are losses in the coil. Want deals for Indoor Antenna Hdtv Antenna, find the best value and save big. The maximum gain was modeled to be 6. Mar 28, 2014 · Antenna Gain Explained. 6:1 or less VSWR and 420 to 450 Mc. It is a very useful bench test equipment for testing and finding out the frequency of various devices with unknown frequency such as oscillators, radio receivers, transmitters, function generators, crystals, etc. This structure exhibits better gain than a quarter wave ground plane and about the same gain as a half wave dipole. NEW! Dual Band Slim Jim J-Pole More gain than a standard J-pole! Thank you for visiting my auction. It can be rolled into a very small coil for transportation and storage yet perform almost like a 1/2 wave dipole. Aug 23, 2010 · 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. The J-Pole is my all-around antenna, what I use for general 2 meter stuff like connecting to my local repeaters using my main 2-m Many do not realize what a poor antenna a J-pole is. But both the J-Pole and Slim Jim antennas require a bit of beefy mounting schemes because they present a good wind load to the mounting structure. At 800 MHz, a quarter-wave monopole does not perform well, so the approach of stacking two monopoles, with a phasing coil between, is used. Description. I specialize in a certain type of antenna called a J-Pole. Louis County, MO I could reach both UMR (Rolla) and UofC (Columbia) repeaters on the Stacked-J at 30 watts, a little noisy on Minimum SWR on 70 cm is very low and the 70cm elevation radiation pattern shows a strong low angle pattern much like the regular 2M Slim Jim or a J-Pole, directing much of the energy toward the horizon and is virtually omni directional. I've been producing these antennas professionally for nearly a decade now and have sold over 15000 units. Calculate the dimensions for a Slim Jim or J Pole antenna for HF, VHF or UHF - Including velocity factor! They're going to be essentially identical in performance. The J-pole configuration tends to increase high angle radiation so as to negate the value of the added radiator length. Easily Install Antennas on your Roof or Wall with this Premium J Pole by BoostWaves. Antenna Gain is a popular subject amongst hams. And the 440 plot It operates as an end-fed half-wave antenna. It has a folded dipole design that gives it more gain and a lower angle of RF radiation,  Build a short spaced vhf uhf collinear J Pole with very high gain. For the same gain and EASY install and tuning, I like a mobile adaptor and a maxrad 3 db gain mobile antenna. 75 dBd) But in reality both are half wave antennas and have NO GAIN over a dipole. Dec 25, 2015 · The super J-pole antenna is a design that is a regular J-pole antenna with a 1/2 wave element mounted above with a 1/2 wave phasing harness connecting the element to the bottom part of the J-pole. 450-470MHz. 5:1 or better over the entire band. 3/8" x 24 Thread Stud Connector with UHF female connector for J-Pole Antennas. A J-Pole Antenna for the 28Mhz (10m) Amateur band. Jan 03, 2011 · There are times I hear that the J-pole is no different than a dipole or even a ground plane which is not true. Such an antenna, illustrated in figure 10(c), looks much like a mobile cellular phone antenna and has a gain Primarily a dipole, the J-pole antenna exhibits a mostly with an average free- space gain near 2. In the process, you'll discover that there were a number of things I didn't know when I made this video. Page 3 Installation Safety WARNING: INSTALLATION OF THIS PRODUCT NEAR POWER LINES IS DANGEROUS! FOR The 2m/440 Super J-Pole . The Bundle Kit includes the HD 2605 Ultra with built in 36dB amplifier, the Motor Rotor, 30 foot Coaxial Cable and the Surge Protector. The J-pole antenna, more properly known as the J antenna, was first invented by Hans Beggerow in 1909 for use in Zeppelin airships. Randy’s approach was a common one in ham radio: Let’s just try it! There is always room for improvement. Claims of antenna gain range from 2. There is always room for improvement. This particular antenna has some gain. 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. Figure 2 shows a polar plot of a the J-Pole has greater immunity to terrestrial noise the J-Pole is great for local nets or distant repeaters the J-Pole has more gain than most Ground Planes the J-Pole is more durable than most Ground Planes the J-Pole meets most "stealth" antenna restriction agreements the J-Pole has less static-charge noise, and static-charge build-up. But if you ground a J-pole the ground needs to be exactly in the middle of the short in the 11 m Band Super J-Pole antenna centred at 27. 2 degree. When copper tubing is used, the entire assembly can be soldered together, ensur-ing electrical integrity, and making the whole antenna weatherproof. The requirement is to have an antenna that generates gain   20 Aug 2018 The slim jim antenna has no more or less gain than a J pole antenna - despite many Internet claims to the contrary. 5. Features: Well I just got done constructing my own jpole antenna for the first time I have wanting to build one of these for a while and since my 1/4 wave groundplane got broke from high winds a week ago I decided it is time to build a better antenna. A J-pole with no problems has 0dB (unity) gain with respect to a dipole, so it's 0dBd. 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. The gain is 2. The handheld transceiver is likely a new ham’s first radio. The addition of a half-wavelength radiating section on top of the J-Pole antenna, increases the original gain by approximately 2 dB, and brings rise to the "Super" J-Pole. ) This is an excellent performing J-Pole type antenna, constructed from readily available materials. 38 dBi - 2. Honestly these can be used for any UHF  5 Dec 2015 The Super J Pole antenna is a co-linear vertical consisting of a number of half wave length vertical elements separated with half-wave length  RaptorZone: Super J-Pole (11 m Band antenna projects). The Super J-pole is an extension of the J-pole antenna. Find this Pin and more on Project Ideas by Tom O'Neill. It is the most effective antenna when compared to other ground plane antennas. J-Pole Antenna FETs, MOSFETs, Thyristors, SCRs, Triacs and many types of diodes. Using what is called "Plumber's Delight" construction I soldered all joints using a propane torch, lead-free/non acid core solder, and some soldering flux. Watch Free HDTV with this Outdoor TV Antenna Bundle Kit. • When used on your HT, it will dramatically out-perform your sto ck antenna. W. 19. The biggest advantage of the J-Pole is that it is at DC ground, so it J-Pole Antenna: 2 M / 70cm HAM. This page describes a simple to build, high gain, omni-directional direct-connect antenna for MURS and 2-meters. com! This 38 inch antenna mount has adjustable base for a variety of positioning options. 50 Primarily a dipole, the J-pole antenna exhibits a mostly circular pattern in the H plane with an average free-space gain near 2. 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. Aug 19, 2015 · This Slim Jim has 2-3 dB gain over a J-pole (The two antennas are end fed dipoles, no more, no less, but with a little interaction from the quarter-wave stub); The J or Slim Jim antenna has more than 2-3 dBd gain (mistaking dBd for dBi); The Slim Jim and J-Pole have different take off angles (evidence clearly shows otherwise). That makes the feedpoint a balanced one and you need a balun or at least a choke. In the 21st century should we believe antenna graphical gain data based on hope and hearsay? J-pole antenna gain drawings are a common bad example. This Bundle HD-2605 Outdoor Antenna with 4-way Splitter + J-Pole The Lava HD-2605 ULTRA is the most powerful Outdoor UHF/VHF TV Antenna we offer with up to a 36dB Gain and 150 mile Range! This TV Antenna has been tested extensively across the USA and it always delivers a strong solid signal! We Side by side UHF antenna trials. What this means is, you waste less power warming up the ground and get more power on the horizon. 500MHz. New item on Signalboosters. Aug 01, 2012 · However a dipole can be stacked and fed with a phasing harness and provide gain. Interestingly, while in an ideal world a J-Pole will perform exactly like a half-wave dipole (as it is one), in reality the configuration of your build makes gain incredibly difficult to calculate. Since the J-pole has gain to overcome the feedline loss, but the same relative take off elevation as a dipole, I thought that would be a good choice to try. 6 dBi at 1. Small additional “gain” (2,4 dBI total) A J-Pole offers about the same gain performance as a half-wave dipole. Aug 01, 2012 · Since a J Pole is essentially an end fed dipole with a matching stub then the gain should be equal to that of a simple half wave dipole correct? I always assumed in the past that a J Pole had slightly more gain over a dipole but how can that be? Performance wise. J-Pole technology This highly stable, higher gain antenna goes the distance and is in a smaller package compared to other high gain antennas. browse photos, prices and more for Indoor Antenna Hdtv Antenna, buy now! FG4500 Antenex Laird UHF Fiberglass Omnidirectional Antenna Unity Gain. 1 dBi (6db gain over a 2 meter J pole used at 450 MHz) This is the UHF 440-450MHz version of Ed Fong's famous J-Pole antenna, which we also feature here on this website. James Pole Antennas can be custom built for frequencies from 50 MHZ, including Marine, Aircraft, and FM broadcast bands. Bundle and Save with the Lava HD 2605 Ultra EZ Bundle Kit by TV Antenna Sale. 25Ω plus 0. 60MHz Frequency Meter / Counter Frequency Meter / Counter measures frequency from 10Hz to 60MHz with 10Hz resolution. He used to sell the antenna thru Ham Radio Outlet, but they seem to have a new, and less expensive, version. All antennas are shipped, tuned, polished, with a SO239 connector attached, ready to connect to coax for quick immediate use. Apr 28, 2016 · You need to go read the articles here before you decide that the J-pole is the antenna for you. The Tri-band J-pole by KB6EPO III. 7% to 6. The Super J-Pole is a popular antenna for use on the VHF and UHF bands as it has a very low take-off/elevation angle of approximately 10 degrees (if constructed and mounted correctly) with an approximate gain of 6. The J-pole antenna is a wire antenna with a form that resembles the letter "J" the original gain by approximately 2 dB, and brings rise to the "Super" J-Pole. " The article stated that there are three kinds of gain: 1. NET. A shunt segment extending out of the plane of the J-pole antenna aids in attaching the antenna to a connector and allowing for a reduction in the size of the antenna and connector. A J-Pole offers about the same gain performance as a half-wave dipole. The super J-pole built for 2 meters is around 9 feet tall, depending on the mounting stub. Which antenna is better: 5/8 wavelength vertical or a J pole? Frequency of operation is 145 MHz = 2 metres. I don't know if it has more gain than the same thing in a standard J-pole, but I really can use more gain. This is the UHF 440-450MHz version of Ed Fong's famous J-Pole antenna, which we also feature here on this website. Gain: 2. Bag & Complete Antenna  The advantages of using deciBels (and of writing poles and zeros in the form (1+ s/ω0)) are now revealed. 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. The down side if a j pole is getting them rugged enough to stand up to wind and weather. Many mounts available in many differenct styles. It is an end fed half wave, and a dipole is a center fed half wave the feed location doesn't change the gain. Oct 24, 2016 · Gain settings are specific to each installation, and optimum gain figures of one installation may not be optimum for another installation. 6%. Gain 20-28dB channel: VHF1-12 UHF21-69 -2016's newest model Antenna is reversible, black on one side or white on the other side, to match any color wall or let your creative juices fly and paint any way to personalize it Comes with 1-year warranty Shakespeare 5400xt 4' Vhf 3db Gain 50 Watt Marine Antenna 1-14 Threaded Base Scout Ks-10 - $120. Sep 14, 2006 · J-pole gain rose to 6. J-pole Antenna - Everybody says keep one in your bag, nobody seems to make one work right. The author wanted something better, so he investigated several types of antennas. Sounds complicated, but it really isn't. Dec 25, 2015 · The super J-pole built for 2 meters is around 9 feet tall, not including the the mounting mast. However, is there any advantage in the Slim Jim's bit which folds back down, or There is always room for improvement. This great page at w8ji. For higher bands it could be copper tubing, or even large-diameter wire. The secret is in the coax stubs that act as traps at high frequencies and shorten the electrical length of the antenna. In order to understand gain differences between antennas, we have to understand the signal from a good basic antenna like  Gain: 2,4 dBI Gain: @ 10m height: 4,23 dBI SWR bandwidth: 1300 Khz Max Power: >10Kw The J-pole antenna is a mechanical 3/4 wave vertical antenna. Antenna Gain Also simply known as ‘gain’, this is a measurement of power that represents the efficiency in which the antenna converts electricity into radio waves. 00. Honestly these can be used for any UHF radio from 450-460MHz, but we asked Ed to tune these to this band specifically for our DMR customers. J-Pole antenna for this station, I used a stan- dard 1/4-wave ground plane vertical antenna. Understanding Gain differences. They do state Aug 23, 2010 · 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. Many like to compare  Le gain vis-à-vis d'une antenne de référence égaux). The matching stub on a J-pole in ideal operation has equal and opposite currents that cancel, so it doesn't radiate. 97 dBi when fed from the middle of a 6cm shunt at the base of the antenna. I can't seem to find any data on what the radiation pattern of homemade J-pole antennas are. 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. Free Online Engineering Calculator to quickly estimate the geometric Size of a J-Pole Antenna J-POLE is a free and portable antenna design software for Windows. It's OK, too. Is it possible to use a j-pole like this above efficiently as a horizontal antenna? Couldn't it be center-fed with, say, 2 collinear half-wave sections seperated by 1/4 phasing stubs? In doing so, I was thinking of feeding the center with 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. No interaction with the ground and the gain disappears. Impedance matching is accomplished by using a "J Pole" driven element fed by coaxial cable. 19 Aug 2015 Real measurements of a Slim Jim antenna and traditional j-pole antenna reveal the truth about their respective gain and pattern. This is a special designed antenna for both analog and digital terrestrial TV broadcasting reception. Neverteless, it makes a great antenna for emergency or on the cheap. 7 Nov 2016 PDF | In this paper a super J-pole antenna with two modified fractal Koch The antenna performances (radiation patterns, VSWR and gain) are  Measuring up the tried and tested 1/4 wave ground plane antenna against a folded j-pole design. Designed as a universal fit for all Outdoor HDTV Over the Air Antenna Satellite Dishes. This antenna has been fully tested to 150 MPH winds using Lowe's 23990 and 3/4 inch pvc pipe. Heavy duty design 20 in. Page 3 Installation Safety WARNING: INSTALLATION OF THIS PRODUCT NEAR POWER LINES IS DANGEROUS! FOR The PRO-SERIES line reinforces that fact. With twice the gain of a standard J-Pole antenna, the 2 meter Slim Jim antenna is a J-Pole on steroids! The Slim is an end-fed folded dipole antenna that has a gain of 6 dbi and a nice low RF take off angle. 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. The requirement is to have an antenna that generates gain above the (0 gain) 1/4 wave. The J-POLE antenna is a quick and easy plumbers delight. Are you looking to buy a digital outdoor antennas This Black Friday 2019, you can buy the best digital outdoor antennas. 75. The reason for that unbalance is primarily cause one end of the J-pole has the “radiating part” on top and the other part doesn’t. 20" mast with 1" diameter television antenna J-pole. $2. 03Ω of capacitive reactance. the J-Pole an end-fed Zep, as it is similar in design to the end-fed antennas of the 1930’s; most notably the antennas used on the Zeppelin dirigibles. The collinear J-pole will radiate 1000 watts with no sweat. The traditional J-pole antenna is made from copper pipe. How bad does a J-Pole look in an Eznec model? I can't tell you if the best J-Pole made will make gain or not, I have no way of telling about gain, except by maybe 10-160 METER 60' END-FED ANTENNA The Alpha J-Pole Sr Antenna is only 60 feet in length. 26 mm solid copper. Any perceived difference in  Many a new ham's first antenna has been the 2 meter J-Pole. 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. The twin-lead version is nice for its small size and weight, and how you can roll it up for travel or slide it into a PVC pipe and stand that in the corner of the room. Amateur Radio2 Meter Slim Jim J-Pole Antenna The Slim Jim Antenna is an end-fed folded dipole antenna that has a gain of 6 dbi and a nice low RF take off angle. W Gain Good prices on w gain!Featuring a big collection of w gain available to buy today. a longer J-pole in non-standard form does not yield the benefits of lengthening a vertical monopole over a buried ground plane. 2-meter "Classic" J-Pole with L1=3/4 and L2=1/4 Wavelength analyzed using 4nec2. • I home built a j pole antenna and with careful tuning I adjusted it to just a bit over 3 db gain as compared with a 1/4 wave ground plane. Primarily a dipole, the J-pole antenna exhibits a mostly circular pattern in the H plane with an average free-space gain near 2. 5DBi. Maximum radiation is also directed away from the horizon. Besides better reception (gain) it also uses less space and is easier to construct because it does not need a ground plane. It is totally UV protected and should last easily 10 years on a repeater mountain top. AWESOME! Great ears and great transmit. In order to increase the bandwidth and to provide proper phasing of the currents in the A J-Pole antenna disclosed including: shunt segment extending out of the plane of the J-Pole antenna. There are also far better antennas that can be built than the J Pole. How do your two meter J-Poles perform on the 440 MHz band? The two . A 1/4 wave vertical over an ideal ground plane performs the same as 1/2 wave dipole because the ground plane mirrors the existing 1/4 wave to make the antenna radiate exactly like the center-fed dipole. Matching to the feed-line is achieved by sliding the connection of the feedline back and forth along the stub until a VSWR as close as possible to 1:1 is obtained. Find outdoor digital tv antenna available for buying here on the internet. The ubiquitous dual band j-Pole antenna, the SE-DBj covers 144 to 146 Mc. 7 degrees higher. Shop VHF/UHF Base Vertical Antennas and get Free Standard Shipping on orders over $99 at DX Engineering! How bad does a J-Pole look in an Eznec model? I can't tell you if the best J-Pole made will make gain or not, I have no way of telling about gain, except by maybe Beberapa situs web menyarankan Super-J memiliki gain 3 dB penuh atas dataran J-Pole yang merupakan klaim sok jelas bagi siapa pun dengan salinan Kitab Antena ARRL dan referensi lainnya [1]. You may want to use the simple J-pole antenna. The J-pole has another advantage: the main radiation from the antenna begins where the dipole portion is above the two-legged matching section. It has two electric poles charged positive and negative. The great thing about J-Pole antennas is their simple design and excellent performance. (do not be mislead with figures higher as 2,4 dBI !) I have two 2-meter antennas, a copper J-Pole and a Hy-Gain VB-25FM. As a vertical radiator, it has a flatttened-donut omnidirectional pattern, sending a radio signal exhibiting a gain of about 2. This is actually the best feed system for the J-pole! The shield is connected to the bottom of the short element of the J-pole, with the center conductor connected to the bottom of the longer element of the J-pole. Rather that worrying about how high to get it, one needs to get a better antenna up. You can typically make one of these for under £10 , they roll up easily for storage and travel, and are great for use at home, or when travelling, for accessing local repeaters. effectively, an antenna array (see sec. (Step-by-step instructions with photos can be seen below, following the project description and safety disclaimer. Claims of gain from 1 to 5 dB are seen in write-ups, but are not substantiated by sophisticated measurement and good theory. the dB/d and dB/i gain based on CCIR regulations (the true and honest real gain!) 2. If you have any questions about this project, contact KK4ICE@ARRL. I like the copper J-pole, so I started a design using that antenna as a model. 37 dBi at 4 degrees elevation (compared this to 2. Kinsner - 3 - September 4, J-POLE PARTS LIST PROCEDURE P2 M1 The J-pole antenna, more properly known as the J antenna, was first invented by Hans Beggerow in 1909 for use in Zeppelin airships. I’m gonna take a confusing subject and hopefully demystify it. 23 dBd. 3 Jan 2011 I've constructed a 144/440 Dual band Open Stub J-Pole Antenna. To some, the antenna will look familiar. With twice the gain of a standard J-Pole antenna, the 2 meter Slim Jim antenna is a J-Pole on steroids! The Slim Jim is an end-fed folded dipole antenna that has a gain of 6 dbi and a nice low RF takeoff angle. High Gain VHF/UHF Collinear J Pole with Phasing SHORT Spaced Coils 146 MHZ By WB3AYW and KK1CW. I don't make them. I don't use them. 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. • In use, it makes for a very effective antenna and provides abou t 3 db of gain. It is used to design J-pole antennas for the desired frequency. (If you don't mind losing a little more than 2db gain). A wooden or fiberglass boom is used, and the elements are 1/8" or 3. 88 dBi down on the j-Pole and with a radiation angle of 0. One of the easiest portable 2M antennas to build for ARES/RACES work is the 300 Ohm Twin-Lead J-Pole antenna. Les deux lobes (90 et 270°) ont un gain de name de J-Pole antenne en de SLIM JIM antenne. Its gain is about 4dbi. The 5/8 wavelength vertical has a loading coil. The online resource for the J-pole dimensions is excellent. It also analyzes transistor's characteristics such as voltage and gain. Discuss this article in our Forum! A collinear J-pole will match 1 to 1 across the band, and give you about 9db of omni-directional gain for about $25. at 1. It was nice not having much reactance, on the other hand a minimum of 3 VSWR, when driven with 50Ω coax, was not so nice. 50 SO-239 to BNC (male) $2. Our club regularly has a Average gain with a 2 meter J-Pole is about 3 db. May 13, 2018 · Antenna Testing, Home Built super J pole or ¼ wave? Introduction: After building a few ¼ wave antenna and simple J poles I wanted to see if I could come up with a Super J which could be built multiple times to a given … J-pole Antenna Revisited Yet Again I recently had a conversation on the radio with another Ham who had built a 6 Meter wavelength band "J" antenna. A photo of this antenna can be seen here. The biggest advantage of the J-Pole is that it is at DC ground, so it J-pole Antenna Revisited Yet Again I recently had a conversation on the radio with another Ham who had built a 6 Meter wavelength band "J" antenna. The unique design characteristics of this 10-160 Meter HF JPole antenna enables it to approach resonance on the major HF bands (10/12/15/17/20/40/80 Meters), all of which presents an SWR that is low enough for external tuners to achieve a near perfect match, including 160 meters. Indeed, the Super-J will never approach the gain advantage of a properly separated two element collinear antenna, but we can get closer to this goal. Will the "J" pole antenna increase the reception for a scanner over the standard of the new antenna and new, low loss coax would get you nearly 6dB of gain. Where is all the gain coming from? well it all due to interaction with the ground, with no ground lets see what it looks like. The ‘J-Pole’ Antenna consists of a half wave vertical radiator and an adjacent quarter wave tuning stub which forms the classic ‘J Shape’. So far the best results have been with a regular old 1/2 wave dipole since its pattern is up off the horizon. The J-pole provides higher gain than the 1/4 wave whip antenna that is widely used on portable transceivers that operate in the 440 MHz amateur region. 500 MHz. Benefits - Ground plane independent - Simplicity - Built in triplexer effect (3 feed lines) - Simultaneous transmission - No Bleed over between bands - Assumed gain. Thus, although the J-Pole can be made to work at its third harmonic, its performance is poor, often 6-8 dB below that of a groundplane. When rolled up, it is an extremely compact, pocket-sized antenna. The J-Pole has the same gain as the Ringo (3. J-pole antennas are said to have greater low-angle radiation and gain versus a half-wave dipole. PDF | In this paper a super J-pole antenna with two modified fractal Koch curve shaped elements is proposed. And, the impedance and reactance are perfect! Below is a quarter wave ground plane antenna I made for 23cm, 1296MHz which is made from off-cuts of household mains copper wire and a scrap BNC socket from the junk box. Later plan is to thread a hole in the base of the antenna to store the loose element for transport. 15 dB = 4. SWR: less than 1. It uses a matching system similar to j-pole antenna. At 34 feet in length the unique design characteristics of your 6-160 Meter HF J-Pole Sr antenna enables it to achieve resonance on 15 & 20 Meters, and presents a SWR on all HF bands that is low enough for 3:1 tuners to achieve a perfect match. 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. 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. 1 dBi (6db gain over a 2 meter J pole used at 450 MHz) Impedance: 50 ohms. We talk about gain all the time, we’ll compare antenna systems and apply values to as how impressive they are by their gain figures. j pole gain

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