6 Meter J Pole Ladder Line

He said it will out-perform the one made of twin-lead. " Enough said! It's difficult to improve on perfection. The line (abbreviated L or l) was a small English unit of length, variously reckoned as 1/10, 1/12, 1/16, or 1/40 of an inch. military fiberglass mast, and 12ft. 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. Joe, N9TAX presented what I thought were some really inexpensive Slim roll up antennas made from 450 ohm ladder line for 2 meters, 2/440, and other frequencies. We stock Nehrwess and Aluma-Form pole risers two though six inches. UPS Ground shipping is 2-5 days, so you can expect your antenna in about 6-9 business days, depending on your location. This calculator can be used to design a Slim Jim or a J Pole antenna. 70cm j-pole. The two elements essentially become a high impedance ladder line, and over 1/4 electrical wavelength transform the low 50 ohm source to a very high impedance, which can then directly feed the end fed half wavelength antenna above. 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. Boom is 1" sq. Currently I have 20 feet with the military mast plus 18 feet with the crappie pole for 38 foot at the tip. I am trying to use EZNEC (nice job, Roy!) to model a 2-meter j-pole made from 450 ohm ladder line and feeding it with 52 ohm coax. The antenna is designed to be fed with 50 or 75 Ohm Coax Cable of most any length with a Balun. How many watts can a J-Pole antenna handle. A calculator for constructing a J-pole or Slim Jim antenna. Radio Amateurs of Northern Vermont February 28th. After Field Day I came home and started to look through my files on antennas for 80 meters. The cable enters the shack through a homebrew wooden patch panel in a nearby window. A G5RV antenna is a dipole with an impedance-matching ladder-line feed stub, with the dimensions of the wire and the ladder line carefully chosen to provide a low SWR on many bands. Det er muligt at sætte to J-pole-antenner sammen til én antenne med et fødepunkt. because it is based on Review of many people, the product is easy to use, high quality material. 3 element beam. Dimensions for a Pipe or Wire J-Pole. 6 METER J POLE. Introduction: A collinear (or co-linear) antenna array is an array of dipole antennas mounted in such a manner that every element of each antenna is in an extension, with respect to its long axis, of its counterparts in the other antennas in the array. The antenna also has a stabilizer to keep the matching stub from swaying in the wind. The two elements essentially become a high impedance ladder line, and over 1/4 electrical wavelength transform the low 50 ohm source to a very high impedance, which can then directly feed the end fed half wavelength antenna above. 6 meter dual polarity (cb mod) (a "cool" idea by kd4wpc) 6 meter rotateable delta loop. We stock Nehrwess and Aluma-Form pole risers two though six inches. 8 : 1 The J Pole Antenna is a vertical ½ wave What about the 2300 Ohm end impedance? To match the high impedance end with the 50 Ohm coaxial feed line, an impedance matching transformer is used. * Durable Ladder wire construction (not tv ribbon cable) * Trapped UHF section for proper band alignment. The antenna plans includes design dimensions for 2 meters, 220MHz, 440MHz and 810MHz. Product Description 38" J-Pole Antenna Mount Versatile all-in-one mount that can be used with antennas or satellite dishes. 2-1 from 440 - 450 MHz. Using an open-wire parallel feedline (commonly called "ladder line") with an antenna tuner, it tunes up on the 10m band as a 5/8-wave loop as well. S11 of our 'photo-model', designed for 2. Leslie's Swimming Pool Supplies, the world leader in residential and commercial pool supplies. TeleScoping Poles. It's a great aerial for /P as it can be mounted high up a telescopic fishing-pole. Build a 2 Meter 5/4 Wave Antenna This antenna is unique in that it is enclosed entirely in 3/4" PVC Easy J-pole antenna. DBJ-UHF was developed from a grant from AC Daughty to develop a low cost medium gain MESH antenna for UHF. A ladder line 2M j pole antenna is a perfect antenna to hang from a tall tree branch to boost your outgoing transmissions and to help you hear weak stations. Watch these videos to get an idea of how. If you watch closely, you can divide the J-pole in two pieces. I dont know, never messed around with ladder line before, so this will be new and interesting. Ron Meyer and Si Kraft established the Kraft Tool Co. We've Got The Widest Range. I wound this on to the fishing pole which gave me 6. Dual Band VHF/UHF Slim Jim Antenna. I have put this antenna into the go kit of the Yaesu VX-6. 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. In DK7ZB’s plans. A 16 foot ladder is leaning against a house. Since 90 percent of all amateur radio emergency communication involves 2 meter FM, a simple roll-up two meter J Pole antenna made of 300 Ohm ladder line was prepared. Serway, and R. The antennas made from 3/4" copper water pipe may have wider bandwidth than the ones made from ladder line or twinlead. Taylor, W2OZH, in which he described a low profile collinear coaxial array. 28 "Pole Attachment" means each communications wire or line attached to a pole, including, but not limited to, cables and service drops. 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. Web-siden beskriver en forholdsvis simpel tobånds J-pole-antenne, der dækker 2 meter båndet og 70 cm båndet. Anderson Powerpole ® and SB ® Connectors The versatile Powerpole® and SB® connector series invented by Anderson Power Products meet a wide range of power connection needs. 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. More information. DX Engineering. 5, 435, 912, and 1265MHZ -- By KG0ZP 2M Fan Antenna (Yes From an Electrical fan) Two Meter Hanging Dipole - From Peter Parker VK3YE Stacked J-Pole Plans I; Stacked J-Pole Plans II; 2M Twin lead J-Pole By K4ABT 2M 1/2-Wave J-Pole-- VHF-FM (Stealth) Antenna Made From 450-Ohm Ladder Line. A ladder line 2M j pole antenna is a perfect antenna to hang from a tall tree branch to boost your outgoing transmissions and to help you hear weak stations. 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. water service standard meter vault d-25 3 inch, 4 inch, 6 inch, 8 inch & 12 inch meter vaults d-26 12 inch meter vault with check valve d-27 typical meter installation for 1 inch water service with lawn hydrant and backflow preventor. ® continues to maintain high standards of manufacturing only quality products made in the USA. The Slim-Jim is a classic - it offers a fair amount of gain and when made from "ladder-line", can be rolled-up and transported in a bag/suitcase. 2 Meter J-pole from 450-Ohm Ladder Line Great first time J-pole project. operated valve (solenoid valve). Minimum Ground Rod Panel Top at ≤ 6’6” Above Ground Level Conduit Support Within 3’ Of Enclosure Type “UF” (Underground Feeder) Direct Burial Cable. Using the W7FG Open Wire Fed True Ladder Line Multi-Band Dipole Is Easy! Why use an open-wire fed doublet? Quite simply, they are efficient, broadband, easily tuned with a balanced input tuner, nearly unaffected by rain, easy to erect, stay up, and remain "trouble free" for years. Ron Meyer and Si Kraft established the Kraft Tool Co. A choke balun is often used, with about five turns of coax, or an air transformer. Calculate the average speed of the couch. 6 METER J POLE. I have put this antenna into the go kit of the Yaesu VX-6. Show all workings in your calculation. I have built a few j-pole antennas for 2 meters and 70 cm over the years and they have worked very well. 5, 435, 912, and 1265MHZ -- By KG0ZP 2M Fan Antenna (Yes From an Electrical fan) Two Meter Hanging Dipole - From Peter Parker VK3YE Stacked J-Pole Plans I; Stacked J-Pole Plans II; 2M Twin lead J-Pole By K4ABT 2M 1/2-Wave J-Pole-- VHF-FM (Stealth) Antenna Made From 450-Ohm Ladder Line. The Wire Size can range from 16 AWG to 12 AWG. * Feedline 1' in length. EAntenna EA6J 6-Meter Vertical Antennas are classic J-Pole antennas as were designed by the German military for World War II. SERVICE LINE DOCK FEEDER. This antenna provides a convenent interface with any dual band 146/440 Mc. Now is the time to try out the 6 meter band! This J Pole can be used either in the vertical or horizontal planes. Six Meters ARRL ANTENNA Vol 5 COMPENDIUM contains an article I wrote providing details about two portable 6 meters antennas I developed, a two-element quad and a three-element yagi with telescoping elements. The line (abbreviated L or l) was a small English unit of length, variously reckoned as 1/10, 1/12, 1/16, or 1/40 of an inch. The J-pole antenna, more properly known as the J antenna, was first invented by Hans Beggerow in 1909 for use in Zeppelin airships. This antenna is also known as the “copper cactus” (because it kind of looks like one of course!). You make the choice. aluminum pipe (for example 3/4 inch pipe which might be used to make a larger 6 meter J-Pole). I dont know, never messed around with ladder line before, so this will be new and interesting. * Will handle 100+ watts. Like all vertical antennas, we should install it as far away from houses, trees, and shrubbery as our home site makes feasible. 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 stubs (Tuning stub) feed with a folded matching stub. That is my take on the different ladder lines. I always clip out all the articles out of QST and put them in different file folders for later viewing. J Pole Lets start with this: The J-pole is actually might be a bit deceiving. About 2 Meter J-pole from 450-Ohm Ladder Line The resource is currently listed in dxzone. (A more detailed explanation is given in my February 2003 QST article. I use 300 ohm ladder for my 440 only antennas it works much better for that. The J-pole and other end-fed Hertz antennas are prime examples of antenna that can have severe feed line common mode current problems. Also, in the name of simplicity, all antennas are fed with ladder line or open-wire line to avoid more complex matching schemes (stubs, gamma matches, etc). 3 meter Attic ladder 4. Construction. If you are making a “roll up” J-Pole antenna out of TV twin lead or ladder line, then you must obtain the value of K (the velocity factor) for that particular type of cable from the manufacture or tables such as found in the ARRL antenna books. A couple of attempts later and about 50cms of wire short, the vertical tuned in to 7. Choke = 4 turns on a 1-inch diameter form. 6 meter dual polarity (cb mod) (a “cool” idea by kd4wpc) 6 meter rotateable delta loop. Super J-Pole Antenna This antenna was developed by the Independent Repeater Association in Des Moines, Iowa, for use on its many repeaters, nodes, and BBS. Not the crappie pole suggested in the Manpack build, but a regular pole, just cut the eyellets off. The J-pole antenna is one of the simplest antennas to construct, and therefore is a very good first antenna to build. 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. Omnidirectional full size 1/2 wave antenna with low angle radiation. i have two masts 42 meters apart with the shack at one end. Unfortunately, they all fall short by not telling readers how to tune the new antenna. ® continues to maintain high standards of manufacturing only quality products made in the USA. Painter’s poles are used for the main structure, 3 sections of 4ft. ) First, a 2 meter antenna 1Notes appear on page 40. Just because. 220 MHz not only has repeaters but has become a. Higher frequencies like narrower wire and lower frequencies wider. S11 of our 'photo-model', designed for 2. does resonate at UHF. EDM 5xx-Series (96 X 96mm) (1Φ,3Φ AC/ DC Meters ) EDM 551-Series (96 X 96mm) (3Φ Electronic Energy Meters ) LED Module Pilot Lights. This small and thin design also makes it good for several stealth applications. The J-pole and other end-fed Hertz antennas are prime examples of antenna that can have severe feed line common mode current problems. Cut out 3 inches of the center part of the ladder line. 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. This was our in! The flagpole kit came from Lowes and cost $29. 3 meter Attic ladder 4. The double Zepp is really just a doublet, or dipole, fed with a balanced line. Product Description 38" J-Pole Antenna Mount Versatile all-in-one mount that can be used with antennas or satellite dishes. If I were doing it again I would make it 5/8ths. key word here is Figure 1 — The original 2 meter ribbon J-pole antenna. J-Pole Antenna Test & Demo (KB9VBR made this) [HD]. Here is a list of parts needed to do this as I did 60" - 61" of ladder line 450. The design uses a matching system like a j-pole antenna. 2M–70CM 300 Ohm Ladder Line (Twin Lead) J-Pole 51 ½” 1¼” 1 ¼” 16 ¼” 10 + feet, RG8X or any small 50 Ohm cable. 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. For higher bands it could be copper tubing, or even large-diameter wire. Multiswitches and DDM’s J. , tune) by simply adjusting the length of the tubular elements. The earlier DBJ-1 is based on the J-pole,2 shown in Figure 1. does resonate at UHF. narrow kerf bar and chain can cut branches up to 6 in. with multiple out-of- phase currents. It was a collinear dual band J Pole that would cover 2 meters and 440mhz. It touches the bottom of a window that is 12 feet 6 inches above the ground. My workshop under the garage needed to have a separate antenna, preferably hung from a nearby tree. operated valve (solenoid valve). I wanted high efficiency 40 Meter antenna with low-angle radiation. Pole Burial 6 Ft. 6 meter 5/8 wave vertical. because it is based on Review of many people, the product is easy to use, high quality material. 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. 6 Meters for the Slim-Jim. It’s very important to understand the difference between grounding and bonding in order to correctly apply the provisions of Article 250. * 6db of gain. I used 12 AWG THHN solid copper coated wire. J-Pole Antenna Test & Demo (KB9VBR made this) [HD]. However when I move up to 7. So the overall height of the antena will be ~15 meter (45 feet) It is no difference in the radiating conditions, if the 1/4 lambda-part is vertical or horizontal. In the UK our frequencies for CB are around 27 - 29 MHz. This antenna provides a convenent interface with any dual band 146/440 Mc. Here come the arguments as about half the designs attach to the radiator. Rental Equipment. As a vertical radiator, it has a flatttened-donut omnidirectional pattern, sending a radio signal exhibiting a gain of about 2. Hi! I need a J-Pole antenna to use with a Uniden 105XLT airband scanner. Unlike the popular 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. Typical construction materials include metal tubing, ladder line, or twin-lead. 144Mhz Slim Jim antenna made from 450 ohm ladder line. Hi,anyone tried a J pole ant. Have been doing this since 1980. You make the choice. 52 NY industrial code rule 753 requires. Tips for using your 2 meter ladder line roll-up J-pole antenna (click here to download PDF). 05 Mhz with a very large bandwidth, certainly better than the loading coil version. 05 meters (10 feet); (2) For voltages to. * MADE IN THE USA! Specs: * Dual Band 2m/70cm (144-148 / 440-450) * Antenna body approx 5' in length. The problem has been critical tuning and narrow SWR bandwidth. The SWR showed a nice resonance point but it was below ten meters more like eleven meters. This antenna differs from the 2m J-pole in a couple of ways. Manuals and free owners instruction pdf guides. 27 "Pole" means a utility pole that is owned by NES that supports power lines or streetlights. The J-pole and other end-fed Hertz antennas are prime examples of antenna that can have severe feed line common mode current problems. For the two meter version, I used an old fishing pole. Most of the big boys around my QTH were regularly working a repeater which is located roughly 70 miles away. Now he had my attention. This is an easy antenna to build and the materials cost about $15-20. The antenna plans includes design dimensions for 2 meters, 220MHz, 440MHz and 810MHz. NEC generated plots for the SSFM are shown in Figure 4. This calculator can be used to design a Slim Jim or a J Pole antenna. For higher bands it could be copper tubing, or even large-diameter wire. Compact Hybrid antenna 2 Meters, 75 and 23 cms Portable Yagui 2 meters (QST 6-85) Rope Ladder Quagi antenna 2 Meters (QST 3-95) A J-Pole for. Notes: The J-pole antenna is a half wave radiator fed by an included 1/4 wave matching section. * Ferrite choke installed on cable. 95: mfj-16f01: mid feed point ladder line insulator w/so-239: $11. But what about all those ladder-line problems? "If the ladder line is balanced, it doesn't radiate RF," he replied. I have tested single-band J-Pole con-figurations constructed from copper pipe, 450 Ω ladder line, and aluminum rod. The caps are optional and are for the prevention of mud dauber nests. Units are required. About Ohio Power Tool. A capacitor of 0. King) in Flint, Michigan. This makes a great emergency antenna. Put the ladder line j-pole inside a piece of pvc pipe. Most of the big boys around my QTH were regularly working a repeater which is located roughly 70 miles away. d-23 new copper 1-inch water service standard meter vault d-24 new copper 1. This MFJ Pocket Roll-up is the perfect gain antenna for traveling. I've been working on a ladder line J-Pole design for 6m, but have had very little luck until today. That is my take on the different ladder lines. I try to get as close to the fire hydrant as possible and wrap any excess ground wire around it after I apply the clamp. 6 meter 5/8 wave vertical. Pityu was able to use some copper tubing, a steel wire from an old CB antenna, and a homemade coil to make this efficient and simple 2 meter antenna. Construction. Find a store or request a quote online today!. DX Engineering. The 2-Meter 300 Ohm TV Twin-lead Roll-up J-pole. Not the crappie pole suggested in the Manpack build, but a regular pole, just cut the eyellets off. POLE LINE HARDWARE. military fiberglass mast, and 12ft. This is correct for mobile j-poles. A touch of Class, The Windom and the J-POLE By Glynn E. Enter the N9TAX line of Slim Jim antennas. there was a simple way to convert a 2 meter J-pole into a dual band J-pole DBJ-2 was developed from the successful performance of the DBJ-1 but folks requested a portable version. I always clip out all the articles out of QST and put them in different file folders for later viewing. Sample application programs available by request Introducing the XLe and XLt Operator Control Station (OCS) , an "all-in-one" controller,. Omnidirectional full size 1/2 wave antenna with low angle radiation. aluminum pipe (for example 3/4 inch pipe which might be used to make a larger 6 meter J-Pole). J pole plans Antenna building is my favorite part of this hobby. I just successfully built an 11 meter j-pole with a long piece of 14 gauge insulated wire, an 8 foot piece of RG-58 coax, a small piece of PVC pipe with a whole drilled in each end as an end insulator, and a section of 450 ladder line. The J-pole has, for the most part, been a 2 meter and 70 cm antenna. Quoting from WB5CXC's web page. (You would be buying the Antenna ONLY, NO antenna analyzer or Cable is included with this sale!). The impedance of this antenna is around 300 Ω, so you may want to use a transformer or a λ/4 long piece of 120 Ω coaxial cable to match this impedance to 50 Ω. Yesterday evening I used the antenna indoors, hanging from the curtain rail, and could reach PI3AMF, a repeater in Amersfoort. 27 "Pole" means a utility pole that is owned by NES that supports power lines or streetlights. This page is to collect our experiences with J-pole antennas. 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. There is a variation of the J-pole called the Slim Jim. 2 METER LADDER LINE J POLE PROJECT- BUILD IT FOR A SONG! Ham Radio Antenna Radios Electronics Projects Hams Terminal Ladder Stairway Ham Ladders. Works as expected. com in 2 categories. New Used Dealer Cert. Since 90 percent of all amateur radio emergency communication involves 2 meter FM, a simple roll-up two meter J Pole antenna made of 300 Ohm ladder line was prepared. A variety of Powerpole® products can handle 15 amps up to 350 amps and accommodate wires from 20 gauge to 4/0 AWG. Build it! If you have an SWR meter you’re well ahead of most. The TV Antenna J-pole antenna mast with a 20' long and 1' diameter pole is the ideal Antenna mast for the 48-100-005, 48-100-004, 48-100-003 or any Outdoor TV Antenna with 1' diameter mounting. I've been working on a ladder line J-Pole design for 6m, but have had very little luck until today. The caps are optional and are for the prevention of mud dauber nests. Compact Hybrid antenna 2 Meters, 75 and 23 cms Portable Yagui 2 meters (QST 6-85) Rope Ladder Quagi antenna 2 Meters (QST 3-95) A J-Pole for. Rent the equipment and tools needed for any job from the largest equipment rental company w/ 700+ locations in the country. Selected Antenna Books. Now he had my attention. This antenna can be rolled up for easy portable use and will outperform a rubber ducky. PVC J-Pole Antennae for 2m. about $6 a pound so I grabbed a small handful of each hardware variety for future J-pole projects. THE 10 AND 3 RULE SERVICE POLE. A ladder line 2M j pole antenna is a perfect antenna to hang from a tall tree branch to boost your outgoing transmissions and to help you hear weak stations. Our kit includes everything you need to build the aerial with just a soldering-iron and a pair of wire-cutters. In this video, we see a simple way to have 600 ohm true ladder line pass from the outside of your house into your ham shack using a simple external balun and a short length of 50 ohm coax to connect your antenna to your transmatch/tuner and then on to your HF rig. A Super J-Pole Antenna for the 70Mhz (4m) Amateur band. The unique design characteristics of this 6-160 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 perfect match, including 6 & 160 meters. 2 Meter Antennas 2M/440 MHz Dual Band Copper J-Pole From N7QVC 2M Fan Antenna (Yes From an Electrical fan) 2 M 1/2-Wave J-Pole-- VHF-FM (Stealth) Antenna Made From 450-Ohm Ladder Line -- From KB1GTR & KB1DIG. Joe, N9TAX presented what I thought were some really inexpensive Slim roll up antennas made from 450 ohm ladder line for 2 meters, 2/440, and other frequencies. Multi-band HF Antennas Part 1 - VA3TPV ZS6BKW. Ladder Line 2M J Pole Antenna - Easy to Build Ladder line is heavy duty and can easily handle the 50 watts put out by most mobile radios. One of the. Buy Antop Antenna Inc J-pole Outdoor TV Antenna/Satellite Mount at Walmart. The J Pole antenna can be made from regular TV twinlead, 450 ohm ladder line, aluminum tubing, copper tubing or wire using spacers for support as needed. Just made one for 2 meter :-). net - Customer Reviews New Alaskan Arrow: 6-meter antennas A Word About SWR Hambrew Magazines Fox Hunt Loops. Leslie's Swimming Pool Supplies, the world leader in residential and commercial pool supplies. 98m, stub section is 4. This is a poor name. The measurements below are for building a simple Dipole Antenna. I use 300 ohm ladder for my 440 only antennas it works much better for that. Over thirty-five years later, Kraft Tool Co. I made one for 4m (70MHz) which is 3 metres long! The quarter wave matching section can be made horizontal, with the half wave radiator section vertical, 90° to it if space is an issue. Now he had my attention. J-Pole Antenna Plans (printable PDF format) (800 kb) This is a flexible antenna that is easy to build, inexpensive and very handy to have in your emergency communications kit. After taking it down, I found a number of. 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. Many RASON members truly enjoyed last month's collinear antenna. 5 inch tubing. S11 of our 'photo-model', designed for 2. The J Pole antenna can be made from regular TV twinlead, 450 ohm ladder line, aluminum tubing, copper tubing or wire using spacers for support as needed. This MFJ Pocket Roll-up is the perfect gain antenna for traveling. Using this calculator set for 146 MHz (the middle of the 2 meter band), I assumed my 450 Ohm ladder line had a velocity factor of 0. is an over-kill with the Windom. As a vertical radiator, it has a flatttened-donut omnidirectional pattern, sending a radio signal exhibiting a gain of about 2. The J-pole is a fairly large antenna, so it is best used at VHF frequencies, although it works on other frequencies as well if you have the space. Select required contactor by catalog number and replace the magnet coil alpha. Just because. Is it that simple? I have made a 2 meter J-pole and it was that easy using all 1/2" copper pipe. " It is much easier to handle than open wire feeder yet retains its ultra low loss feature. 2 What is classical mechanics? Classical mechanics is the study of the motion of bodies (including the special case in which bodies remain at rest) in accordance with the general principles. soon to be disconnected from the grid. mfj-16d01: insulator, 450 ohm ladder line, center, fibreglass: $9. 98m, stub section is 4. However, they did not prohibit a flagpole to show off the colors. 1 dBi (6db gain over a 2 meter J pole used at 450 MHz) One can use 450 ohm open ladder line but it will not fit into a 3/4 inch 200. another 6 m j pole design (archives of the “wayback machine”) 6 meter slim jim 300 ohm metric. does resonate at UHF. Condux International has been manufacturing cable installation tools and equipment for over 30 years. This is a common concern as there are many different styles and construction methods of J-Pole antennas. For 20 meter band, 1/2 lambda radiator is 9. Looking for more information about multiband performance and impedance matching, I found a very interesting article, "A Compact and Efficient Multiband Beam Based on a Modified W8JK Array” by K5LJ. Having recently expanded my amateur radio collection to include 6-meters, I found myself needing something more than the wire dipole antenna I originally installed. Technically, the Pockrus™ J-pole Joystick™ antenna is a dual-band (2 meters and 70 cm) open-stub, half-wave J-pole antenna. 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. We've Got The Widest Range. Choke = 4 turns on a 1-inch diameter form. * Durable Ladder wire construction (not tv ribbon cable) * Trapped UHF section for proper band alignment. 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. The antennas made from 3/4" copper water pipe may have wider bandwidth than the ones made from ladder line or twinlead. We stock Nehrwess and Aluma-Form pole risers two though six inches. Not sure how for the six meter version yet but it cant be that hard. Nearly a year after mounting my 2 meter j-pole antenna, I had the opportunity to attend an antenna workshop. the feed-line impedance is the usual Z C = 50 ohms. I have tested single-band J-Pole con-figurations constructed from copper pipe, 450 Ω ladder line, and aluminum rod. A ladder line 2M j pole antenna is a perfect antenna to hang from a tall tree branch to boost your outgoing transmissions and to help you hear weak stations. MADE IN USA WITH HIGH QUALITY COMPONENTS. The difference is day and night compared with a dipole. The DBJ-1: A VHF-UHF Dual-Band J-Pole Feb 2003 QST 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. My main shack location has a commercial J-Pole Dual band mounted on a short mast. 3 meter Extension ladders 10. Each antenna is made from 300 ohm ladder line with 6 feet of RG-58A/U coax cable. 2M Ladder Line J-Pole Update: Since I wrote this, I've seen in several places that coil chokes are not effective on 2M & higher. Because I have no interest in encouraging more abuse, I will not provide said file to those who have made personal attacks. I just tapped the half wave and the stub starting at the tip of the crappie pole. This antenna is unique in that it is enclosed entirely in 3/4" PVC which makes the design a little more complicated. 64 for each leg). We take what’s possible and make it a reality. This started out being a stelth antenna for a friend. By Fred Delaney, K1DU. Thanks to Pityu Nagy for this fascinating video on how to make a 5/8 J-pole antenna for 145 MHz. 9 cm) of 450 ohm Ladder Line. Browse all of the products Uline stocks including shipping boxes, packing materials, mailing supplies, warehouse supplies and janitorial supplies. DX Engineering Coax Cable Stripping Tools DXE-UT-8213. A-Aerial Service Co. Dual Band VHF/UHF Slim Jim Antenna. Unfortunately, they all fall short by not telling readers how to tune the new antenna.

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