2m J Pole Antenna

If you prefer different it is imperative that you message me the connector type immediately after ordering. As such, it will have a higher radiation angle component on 70 cm than on 2 meters, so 70 cm re-. Parts used found @ home depot, build time 1 hour k0bet, jpole, j-pole, super jpole, home brew jpole, diy jpole,. Many commercial HF antennas use this technique to achieve good patterns on their multi-band antennas. The J-Pole is an excellent antenna for working the local repeaters and 2m simplex voice and digital. Both call for 1/2" EMT conduit. The J-pole antenna, more properly known as the J antenna, was first invented by Hans Beggerow in 1909 for use in Zeppelin airships. Aluminium Fascia Pole "Hockey Stick" Mast. We call the antennas Slim Jims and they pack a lot of punch but do not unpack your wallet. 5 wl antenna. It may load up nicely, but so does a dummy load. Eh antenna plans. See here for details about Gulf Alpha and Arrow Antenna. Your neighbors will never notice it. So right now I am running a 2M J-Pole that I already had up, with about 50' of LMR-400. What's a cost-effective way to boost the range of my cheap 2m/70cm handheld? I personally own the dual band J-Pole antenna from Arrow Antennas and it works. It is likely that any real world tests that show the Slim Jim to have better low angle. Exterior Dual Band Omni directional antenna 2. The Northern Virginia team of Ham Radio operators and companion hikers manned Hawksbill Mountain for the 2011 Appalachian Trail Golden Packet event. SWR should be < 1. Alfa 9 dBi AOA-2409N outdoor Wi-Fi omni-directional antenna + mount bracket kit. At home, on the road, vacations, camping, hiking, its easy to take care with you. the J-Pole antenna build I did probably cost me around $20-25, including the mounting. Your neighbors will never notice it. Parts used found @ home depot, build time 1 hour k0bet, jpole, j-pole, super jpole, home brew jpole, diy jpole,. 91 - Inductance-Loaded Shortened Dipole for 160m. Jelinek N6VNG. Shop for 2 Meter Antennas here. Stealthy Roof-top 2m Base-station Antenna This 2m roof-topper slips over a vent-pipe. the J-Pole antenna build I did probably cost me around $20–25, including the mounting. This page is to collect our experiences with J-pole antennas. BUX BALUNs are used to connect balanced antennas to unbalanced transmission lines, such as coax cable. Hi! I need a J-Pole antenna to use with a Uniden 105XLT airband scanner. The J-Pole will take about an hour or so out of your day to build and tune, making a great antenna for a VHF base station. The design is based on an article which originally appeared in CQ magazine (1987), and a version of this design is produced by Arrow Antennas of the USA (not. 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. For 2 meters, the coil is 4 turns of coax at 5 inches in diameter. This how to will show you how to build a 2 meter slim jim antenna from ordinary insulated copper wire commonly used for carrying AC (alternate current) electricity in your. Tuning is straight forward; but, it will require some experimentation. Robbie builds a 2 meter J-pole antenna. There are several features which make the ubiquitous Twinlead J-Pole antenna a good addition to your emergency grab-n-go kit. Best of all, even if the parts aren't on sale, the antenna can be built. This antenna is similar in construction to the 2-meter OFC sleeve dipole I built over 8 years ago, but it is a simple center-fed dipole. This is a 3/4 wavelength J-pole optimized using JSC 1220 custom twinlead. 90 - Double-Delta Antenna 80m and 40m. I have two 2-meter antennas, a copper J-Pole and a Hy-Gain VB-25FM. military fiberglass mast, and 12ft. Visit the original J-Pole Antenna Store. It also works great as a /P aerial when placed up a non-conductive pole (like a telescopic fishing pole). 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. on all models except the 2M/440 and Tri-Band where the 440 MHZ SWR is approximately 1. 440 from a 2m Antenna? Many makers of J-poles for 2 meters claim they can also be used at 70 cm. They rely on return ground currents and use the ground as part of the antenna system. eabyAuc dual 16 Connector Options The SMA Male is the default connector. This is important because if the mast extends above the antenna ground plane it will affect the performance of the antenna. eabyAuc dual 16 Connector Options The UHF Female (so-239) is the default connector. Placing a 1/ 4-λ Q section in the feed line at the feedpoint A 146- and 445-MHz J-Pole Antenna 1Notes appear on page 53. "FIX" ANTENNA TO MAST 2 INCH HOSE CLAMPY "U" BOLTS MAY CRIMP COPPER PIPE HOSE CLAMPS SECURE WELL IN MY NOTE: The radiating element of this antenna must be clear of nearby metal objects by at least inchey If side mounted on an use 6 foot side mount Top of antenna may requÑe: ulated supp ott at high (wind, ice) elevationy 1/2 INCH COPPER. I am no expert in antenna design but enjoy playing with different ideas. Note that the antenna should be tested before gluing the end caps in place. Play next;. Since you have data collection, build a 1/4 wave ground plane and compare it to the wire J pole, for scientific curiosity. A J-Pole for 2-meters and 70-cm - related links We thought you might also be interested in these additional web sites, selected from the same category: A 146 Mhz J-Pole Antenna - A 2 meter (146 Mhz) J-Pole antenna that is inexpensive, and easy to bu. Although not held high in the air, it is still an effective radiator (Ed has measurements to show these properties). The most recent antenna I replaced with a J-pole was a 2 meter (see figure 1b), aluminum, base station, commercially built, amateur antenna purported to have more than 3 db gain over a dipole. But what's a J BEAM? It's a vertical directional antenna made of 1/2 inch copper pipe and wood or PVC. A 2 meter easy homebrew jpole antenna build - This Super jpole costs under 20 bucks - Hits repeaters 45 miles away. This antenna is also known as the "copper cactus" (because it kind of looks like one of course!). I've had one for several years. At 146 MHz, this antenna’s input im-pedance is about 65 Ω, delivering an SWR of about 1. 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. 2 Meter J-Pole Antenna. Attention: The mounting in a plastic pipe or with tape on a fishing rod will detune the antenna to lower frequencies and needs a little bit of correction!. Another 2metre vertical. HIGH QUALITY ANTENNA TRIPOD 29FT ALUMINUM PORTABLE TOWER MAST KIT NEW. This antenna has been fully tested to 150 MPH winds using Lowe's 23990 and 3/4 inch pvc pipe. My current 2 meter antenna is a homebrew copper pipe J-pole whose extended base sits inside an aluminum pole mounted to the side of the house. Construction Plans for the Arrow Model J146/440. 2 meter band covers 144-148 MHz, we use 146 for calculations In a vacuum, electromagnetic waves travel at the speed of light, close to 300 million m/s. DBJ-1 J-Pole Antenna (before housed in PVC tubing) Back in June 2015, I think, I wrote about an odd-ball J-Pole antenna I was using for 2m and 440 at the base station here. TUNING A WIRE J-POLE ANTENNA O There have been many good 2-meter, or 2-meter/7()-cm J-pole construction articles published in Amateur Radio maga- tines and numerous club newsletters. They avoid the potential pitfalls of typical antennas and build the best, most reliable antenna systems for your amateur communication needs. KP-2/2M PRE-AMP,2-Meter Mast-Mount,144-148 MHZ High gain ultra low noise GaAsFET preamps for receiving weak signals. We are committed to serve our customers with cheap Type M Male Plug deals. Sales, Supplies, and Service. 5 watts, comparisons with a J-Pole at the same elevation indicated that the 2-element array was a major improvement for distant repeater access. Key Features. PCS Electronics. 1 dBi (6db gain over a 2 meter J pole used at 450 MHz) Impedance: 50 ohms The published papers on these antennas are attached. A balun is necessary because a J-pole antenna uses a balanced feed (the. This page documents a build of a 2-element 1/2 wave collinear J-Pole performed by Harry, KC9EOT, and myself, KB8OJH. One day I started to wonder how J-pole antenna really works. Notice how Alan decouples the coax by passing it within the lower segment of the antenna pipe. Buy products related to 2 meter antennas and see what customers say about 2 meter antennas on Amazon. At the end of the class, you will come away with a working J-Pole that you can mount inside or outside to help hit those distant repeaters. j-pole by ik1blk Realizzata con tondini di Alluminio di diametro 10 mm. Building my +5 Staff of Summoning. The James Pole Antenna is constructed of 1/2 inch Type M copper pipe, soldered together and capped on both vertical elements. This is a GREAT little antenna for performance. Although the design specifies 51 inches in length, Dom notes that other builders have found this resonates too high in frequency and they suggest you start at 52 inches. Best of all, even if the parts aren't on sale, the antenna can be built. Questa antenna combinata funziona come un J-Pole a 70 cm e 1/4 di lunghezza d'onda a 2M. One of the antennas was a 2-meter J-Pole which he had built himself from 1/2" copper pipe. About the J-Pole. Build A 9 dB, 70cm, Collinear Antenna From Coax By N1HFX Recently the RASON technical committee was hard at work at the repeater site repairing our 2 meter repeater antenna. 89 - Indoor Loop Antenna for 80m. A Wavelength equals velocity in meters per second divided by frequency in hertz. We are committed to serve our customers with cheap Type M Male Plug deals. Tame the predictable mast currents found in any j-pole antenna grounding conductive mast using a simple stub. The j-pole antenna will yield slightly less than 3 DB of gain omnidirectionally. The SE-DBj, dual band J-Pole antenna covers 144 to 148 Mc. The Simplified 2 meter J-Pole By Michael Martens, KB9VBR Many a new ham’s first antenna has been the 2 meter J-Pole. Antenna with SMA Male Connector. Type M Male Plug Sale. I really like the design of this antenna due to its simple and cheap construction, ideal feedpoint placement for low stress on the coax, and the fact that the whole antenna can be easily grounded since at DC it is essentially a short circuit. Copper Cactus 2m J-pole Post by crypto » Mon Oct 29, 2007 12:41 am I made a simple 2-meter j-pole antenna out of copper pipe this weekend, to see if I could coax some range out of my poor little shitty borrowed Yaesu HT FT-23. I'm planning to setup a J-Pole on my back deck (attached to one of the railings, raised up ~15ft and out of the HOA's sight) and have two questions: This is a rental home so I can't drill through walls. It has weathered six or seven Maine winters. I am getting around a lot within the 100NM range, a little in the 150nm range. The 2-Meter 300 Ohm TV Twin-lead Roll-up J-pole. 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. It uses a standard J-pole antenna as the driven element and center support, with two parasitic elements-----a reflector and a director, to provide directivity and gain. Shop with confidence. It also has a little bit of gain over the J-Pole although not much. telescoping fiberglass. com in 2 categories. October 11, 2012 at 1856 UTC. re: 2m/70cm roll up j-pole/slim jim antenna Post by HBP » Wed Jan 13, 2016 11:57 am TheOldHObbit wrote: I am unable to trip a 2mtr repeater 17 miles away with either the stock antenna or a 15" third party one, but when I put the slim jim up on a 5 mtr fishing pole it trips the repeater no problem. Enter the required frequency in MHz and the antenna designer will calculate the dimensions of the elements as shown below. A 2 meter easy homebrew jpole antenna build - This Super jpole costs under 20 bucks - Hits repeaters 45 miles away. Simple 2m Seems easy but he uses 3/4 copper pipe. Click Votes Antennas J-POLE; 2m-70cm antennas super jpole, VE3ELB: 440 Mhz J-Pole Antennans, WB8ERJ. The resource is currently listed in dxzone. 2-Meter Sleeve Dipole I used it first as my base antenna but change it to a super J-pole which works a little better. So before the snow storm hits tomorrow, I thought I would try making some j-poles with the Buddipole. 3:1 at resonance. net is a Web site dedicated to ham radio (amateur radio). 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. We are committed to serve our customers with cheap Type M Male Plug deals. future J-pole projects. 2 Meter Copper J Pole Dr. 2 Meter WB8ERJ. It also has a little bit of gain over the J-Pole although not much. The goal here is to put up a cheap, easy, and quick 2-meter antenna that is simple and unobtrusive, but works quite well. I've had one for several years. I've found that when you portability and convenience you almost always sacrifice some aspect of performance. My main shack location has a commercial 2M J-Pole Dual band mounted on a short mast. This form of antenna originated as a practical solution to feeding a wire antenna trailing behind a dirigible. Home brew copper J-pole (Primarily made for 2 meters but works surprisingly well on 70CM as well) This was a project that looked easy enough to build at home. 220 MHz not only has repeaters but has become a. John Huggins KX40 covers this question on this page. You can find a range of affordable J-pole antennas with different features when you shop on eBay. Kinsner, VE4WK J-POLE ANTENNA FOR 2m 3 of 3 1 2 3 4 5 6 7 8 E D C B A E D C B A 1 2 3 4 5 6 7 8 5 June 1992 J-POLE PARTS LIST PROCEDURE P2 M1. The proceeds of these antennas go to support my group at UC Santa Cruz -Santa Clara Valley. Heavy duty 32mm OD. with a VSWR of 2. These Antennas are available for a number of bands and with a wide variety of connectors. Unfortunately, they all fall short by not telling readers how to tune the new antenna. 2 Meter Ed Humphries N5RCK. Hi! I need a J-Pole antenna to use with a Uniden 105XLT airband scanner. I am going to build a dual band j-pole antenna. while I really like this antenna, the 1/4 ground plane is a more simple antenna to build your first time and also more forgiving. This disguised TV dish slot is equal to a J-pole. 2003 QST and designed by Dr. Get home station performance on-the-go! Just. Origination of J-pole and Zepp Antennas. This antenna is similar in construction to the 2-meter OFC sleeve dipole I built over 8 years ago, but it is a simple center-fed dipole. Note that the antenna should be tested before gluing the end caps in place. They can be 3 or 4 sided and polarization can be changed depending on how they are fed. Bob WB6YJJ generously hosted the eager builders in his garage workshop. The antenna is broad-banded and should therefore provide a low SWR across the entire 2-meter band. Substitute Romex where twin-lead is stated in the article(s). This page is to collect our experiences with J-pole antennas. We call the antennas Slim Jims and they pack a lot of punch but do not unpack your wallet. With twice the gain of a standard J-Pole antenna, the 2 meter Slim Jim antenna is a J-Pole on steroids!. Ruggedly constructed one piece design, this J-Pole antenna will last practically forever. We do not normally stock it. An interesting fact to note is that ½ wave center-fed dipole- type antennas will resonate at odd harmon-. The SIMPLE 2m Copper 'J' Antenna : by KB9VBR on September 18, 2001 : Mail this to a friend! The J is a great antenna. The 6 meter J-Pole is The 6 meter J-Pole features a two piece design for shipping and easy storage. Based on Arrow's model. Note that the antenna should be tested before gluing the end caps in place. Stealthy Roof-top 2m Base-station Antenna This 2m roof-topper slips over a vent-pipe. 15-22 dB gain. This is a 3/4 wavelength J-pole optimized using JSC 1220 custom twinlead. Trailed behind the airship, it consisted of a single element, one half wavelength long radiator with a quarter wave parallel feedline tuning stub. SUPER J-POLE FOR 435MHz: The Super J-Pole antenna for 430 - 450MHz was constructed and used for FM simplex and repeater operation at my previous residence in Melbourne, Victoria from 2002 - 2007. It does not need a ground plane, radials or a complicated matching system. Just got this J-Pole antenna. At home, on the road, vacations, camping, hiking, its easy to take care with you. References. J-pole 145/220/440Mhz Tape Measure 2M Beam + Offset Attenuator This strange looking antenna is a combination of Coupled-Resonator principle by K9AY and ¼ stubs to achieve low angle radiation pattern. My main shack location has a commercial J-Pole Dual band mounted on a short mast. 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. But what's a J BEAM? It's a vertical directional antenna made of 1/2 inch copper pipe and wood or PVC. Dual Band J Pole 2M-70cm. This is my NEWEST deluxe model roll up Slim Jim/J-Pole antenna with 10' of coax! WHOLE ANTENNA IS 3 OUNCES and made to fit your rig! Are you looking for a truly portable antenna with BIG performance? This deluxe version is the same as my basic version but with 2 differences. This is a GREAT little antenna for performance. Looking for a simple, affordable, high performance antenna? Our J-Pole antennas work great and are. The best antenna is the one you just made a contact with. I have a Yaesu FT-2DR and often turn it on in my shop to listen to local repeaters. Most are built out of copper pipe and are rigid. Although the design specifies 51 inches in length, Dom notes that other builders have found this resonates too high in frequency and they suggest you start at 52 inches. 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. In these photos are shown how it is setup and base elements can be connected together in a long pole for easy transport. Many RASON members truly enjoyed last month's collinear antenna. According to the J pole Handbook, A BUX VBALUN ($20) should be installed at the antenna feed point, or where the coax or feed-line attaches to the J-Pole antenna. 195- 197 An Easy Dual-Band VHF/UHF. pdf Simple 2m Copper Pipe J. For 2 meters, the coil is 4 turns of coax at 5 inches in diameter. Building And Tuning 2 Meter 144 Mhz Copper J Pole Antenna Updated Don's 2 Meter Extreme Dream Beam Antenna - Duration: More on the J-pole Antenna (#163) - Duration:. SUPER J-POLE FOR 435MHz: The Super J-Pole antenna for 430 - 450MHz was constructed and used for FM simplex and repeater operation at my previous residence in Melbourne, Victoria from 2002 - 2007. This is called the j integrated match (jim) the antenna itself is very slim hence the name Slim Jim. 2M/440 antenna - how/where is yours mounted Thinking of options for 2M/440 operation while in motion and stationary. But there are better directional antennas that you can build as well. pdf Simple 2m Copper Pipe J. Vacations, camping, etc. PCS Electronics. Both call for 1/2" EMT conduit. The total cost of materials per antenna was only $20. I have a Yaesu FT-2DR and often turn it on in my shop to listen to local repeaters. 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 2 Meter Collinear J Pole Antenna Project by Sean M3FVB. The antenna is sturdy, portable, and will give you modest gain on this popular band. Auto RF switching to 160W. I wanted a picture of the antenna complete for the last post and…. We also offer. The J-Pole is an excellent antenna for working the local repeaters and 2m simplex voice and digital. 2 Meter Amateur Radio J-Pole Antenna | KB9VBR J-Pole Antennas. pdf J-Pole with VSWR Adjustment. 15-22 dB gain. Re: Building a 2m J-pole Yes your absolutlet correct the coax is shorted out on the "J" part and your also correct in its one of those AC moments! The "J" or lower bit is a impedence matching transformer to give 50 ohms, you have to choke the coax off at the feed point on this type of antenna either by a few turns of the coax round a piece of. Best of all, even if the parts aren't on sale, the antenna can be built. 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. John Huggins KX40 covers this question on this page. Questa antenna combinata funziona come un J-Pole a 70 cm e 1/4 di lunghezza d'onda a 2M. Radio Shack # 21-961 3/8"-24/SO239 Mount (Mobile CB Antenna). She modeled the antenna in various situations (mounted to mast, free space, free space with ground) and even published the NEC files for all to see. If you are looking for a good VHF or 2 meter antenna i do suggest you get one. OH2NLT 2m J-Stick antenna experiment 27. DISH ANTENNA Manufacturer Reviews and Directory Listings of 21 DISH ANTENNA manufacturers from China and the rest of the world. To support the antenna, lash it to a piece of PVC pipe with UV-resistant nylon cable ties. 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. As I was setting up my amateur radio station, one requirement was for 2M and 70cm antennas in two locations. 2M/440 antenna - how/where is yours mounted Thinking of options for 2M/440 operation while in motion and stationary. Progress In Electromagnetics Research M, Vol. J-Pole Antenna Schematic (courtesy: wireman j-pole DK7ZB) Despite the long history and popularity of this antenna, there seem to be a lot of confusion about what this is and how it works. This form of antenna originated as a practical solution to feeding a wire antenna trailing behind a dirigible. We present an underground long baseline atom interferometer to study gravity at large scale. I wanted a picture of the antenna complete for the last post and…. Trailed behind the airship, it consisted of a single element, one half wavelength long radiator with a quarter wave parallel feedline tuning stub. No damage at all, and it kept right on ticking. The material I chose to build the j-pole antenna was 3/4 inch copper pipe used for plumbing. By design, there is no need for a ground plane and it resonates very well on 70CM as well!. Ruggedly constructed one piece design, this J-Pole antenna will last practically forever. On-line antenna designer. 87 - Capacity Tuned Folded Loop Antenna for 20m. Both call for 1/2" EMT conduit. In the process, you'll discover that there were a number of things I didn't know when I made this video. Building And Tuning 2 Meter 144 Mhz Copper J Pole Antenna Updated Don's 2 Meter Extreme Dream Beam Antenna - Duration: More on the J-pole Antenna (#163) - Duration:. View the manual for MFJ1730 View the manufactures page for MFJ1730 Roll up this 1/2wave 2 Meter J-Pole antenna and stick it in your pocket. My current 2 meter antenna is a homebrew copper pipe J-pole whose extended base sits inside an aluminum pole mounted to the side of the house. Visit the original J-Pole Antenna Store. Radio Shack # 21-961 3/8"-24/SO239 Mount (Mobile CB Antenna). He described it as a 3 element J Pole with 2 phased elements. J Beam Project 2 Meters and up N3SDO. The Slim-Jim is velcro-tied to the pole at around 2/3 up and used with my FT-60 handheld for local QSOs on 2m/70cm. The performance of this J-Pole is, theo-retically at least, equal to a ¼ wave radia-tor over an ideal ground. You have just found the webstore of the highest quality hand made portable antenna on the market. 95 is a bargain and an excellent antenna. I've been producing these antennas professionally for nearly a decade now and have sold over 15000 units. 20-Meter "J" Pole Vertical. They also appear in the ARRL VHF/UHF Antenna Classics, ARRL Vol 8 Antenna Compendium, ARRL Vol. j-pole by ik1blk Realizzata con tondini di Alluminio di diametro 10 mm. This link is listed in our web site directory since Monday Oct 11 2004, and till today "A J-Pole for 2-meters and 70-cm" has been followed. bandwidth) using a single feedline. pdf Generic J-Pole Calculator. We present an underground long baseline atom interferometer to study gravity at large scale. by Mike Walkington, VK1KCK. This antenna is not designed to be connected directly to a radio. Unlike magmounts, this antenna does not require a groundplane (J-pole has same properties as a dipole antenna). 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 simple J pole antenna is capable of excellent results as the below antenna computer modelling of a 2M band J pole antenna illustrates. pattern (black) and the same antenna on 70cm (red). Pipe your signals to 146 and 445 MHz with one antenna! Table 1 Materials Required. 3 Antenna Compendium. 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. 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. I bought a 2m J-Pole one year ago & had fantastic results from it. I figured the cost of me building on was more economically sound and the experience gained in the process would be priceless. Being a halfwave antenna, it is not dependent on a ground or radials for proper performance. My main shack location has a commercial 2M J-Pole Dual band mounted on a short mast. Second, the feed point seems to be at a different point. 7) CUSHCRAFT A627013S - 3 Elements 6m/2m/70cm Triband Yagi Antenna 8) CUSHCRAFT AR270 - Dualband Vertical 2m/70cm 3,7/5,5dB 2M + 70cm Open Sleeve Vertical Dipole I was playing around with the MMANA Antenna analysis software and wanted to design a 2m/70cm vertical antenna. KB9VBR J-Pole antennas are highly effective, affordable antennas for the VHF and UHF frequency spectrum. Per realizzare l’isolamento dell’elemento radiante, eseguire il foro passante sulla basetta ha il diametro di 15mm. The performance of this J-Pole is, theo-retically at least, equal to a ¼ wave radia-tor over an ideal ground. That's also a plus for portable operation. 2M Twin lead J-Pole By K4ABT 2m + 70 cm -- From HB9ABX A Simple Seven Element Yagi Antenna A JavaScript that quickly calculates the dimensions for a seven element Yagi Antenna. This form of antenna originated as a practical solution to feeding a wire antenna trailing behind a dirigible. Get home station performance on-the-go! Just. Dave's J-Pole Antenna Calculator. Parts Needed. A Copper Pipe Jpole for Two Meters. It also includes a copper tubing support that is a quarter-wave from the antenna elements so that, when strapped to a metal pole or tower, it will increase the forward power in the direction of the antenna elements. In a comparison using a field strength meter, the antenna doubled the field strength when compared to a standard J Pole I installed on the same mast. > >What are the pros and cons of an Arrow J-pole versus a Diamond X50A pole?. We call the antennas Slim Jims and they pack a lot of punch but do not unpack your wallet. 2m/70cm Ground Plane Antenna. The design would theoretically provide an impressive 9db gain (a claim that has generated some debate online) over the discone antenna I was using at the time. AUTHENTIC N9TAX VHF/UHF Slim Jim J-Pole For HT 2m 70cm Antenna 10' Coax - $25. The information is still useful to familiarize members with the antenna in preparation for the build. Shop with confidence. 87 - Capacity Tuned Folded Loop Antenna for 20m. 5/8 antenna could have about 3. Sperrtof 2M Antenna-- aka Sleeve Dipole or Sleeve J-Pole. The 5/8 wave antenna is easier to tune and not as cranky about mounting location and nearby objects as the J-Pole. This is the famous DBJ-1 dual band J-Pole antenna, designed and sold by Ed Fong - WB6IQN. This is ideal for most dual and radios that us a single antenna port for both VHF and UHF. (Step-by-step instructions with photos can be seen below, following the project description and safety disclaimer. The material I chose to build the j-pole antenna was 3/4 inch copper pipe used for plumbing. With simple, inexpensive components and relative ease-of-use, the J-pole is a great gateway into the world of antennas, and it offers some additional technical benefits as well. 2m/70cm Dual Band J-Pole by KK4ICE. , with a VSWR of 1. Premium KB9VBR J-Pole Base Antenna 2 meter dual band amateur ham radio scanner DELUXE MODEL ROLL UP 2M/70CM ROLL UP J-POLE/SLIM JIM ANTENNA WITH 10FT COAX End Fed Dipole 80-6 meter Portable HF Antenna Matchbox System. _____ Costruire un'antenna J-Pole Dual Band 2M / 70 cm Questa antenna è facile da costruire al coperto o portatile su 70 cm o dual band 2M e 70 cm. 3 dB -45 dB -38. Works well with handheld HT radios, base stations, and repeaters. (Note: It is always good practice to use an Antenna Analyzer when building a custom antenna!). 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. Old-timers. Obviously a resonant j-pole with some elevation would be better than a rubber duck antenna. Trailed behind the airship, it consisted of a single element, one half wavelength long radiator with a quarter wave parallel feedline tuning stub. 86 - Fan-Dipole Antenna for 80m to 6m. References. FREE delivery. J-Pole Antenna Length Calculator; Stealth Outdoor Ham Radio Antenna; Sound Card Packet TNC; Random Password Generator; Web Hex Color Codes; Pantone Color Codes; Portable Roll-Up J-Pole Antenna Deployment and Usage Tips; Blog; Contact. She modeled the antenna in various situations (mounted to mast, free space, free space with ground) and even published the NEC files for all to see. A wide variety of single pole antenna mast options are available to you, such as steel, metal. What can I do? A: Try adding a balun to the coax. Parts used found @ home depot, build time 1 hour k0bet, jpole, j-pole, super jpole, home brew jpole, diy jpole,. A 2 meter easy homebrew jpole antenna build - This Super jpole costs under 20 bucks - Hits repeaters 45 miles away. I tried different antenna models, J-pole, Amateur Radio Antenna Projects. Subsequent testing was done with the assistance of NG4T, Communications and Electronics Officer for the Third Alvin C. Where can I find a guide with the information to make one ? I know there are a lot of guides but I would like to get one optimized for airband. 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. One of the antennas was a 2-meter J-Pole which he had built himself from 1/2" copper pipe. For 2 meters, the coil is 4 turns of coax at 5 inches in diameter. This antenna can be rolled up for easy portable use and will outperform a rubber ducky. Vacations, camping, etc. This paper describes two types of 2 meter J-Pole antennas, one made of copper pipe and a roll-up J-pole made of TV twin lead. Technically, the "J" antenna is an end-fed ½ λ antenna that uses a ¼ λ matching stub. HIGH QUALITY ANTENNA TRIPOD 29FT ALUMINUM PORTABLE TOWER MAST KIT NEW. Enter your desired frequency and get the calculated lengths from below. The design would theoretically provide an impressive 9db gain (a claim that has generated some debate online) over the discone antenna I was using at the time. The 2-Meter 300 Ohm TV Twin-lead Roll-up J-pole. bandwidth); and 420 to 450 Mc. 3:1 at resonance. References.