J pole calculator. 1dB gain over isotropic).

J pole calculator Materials • We looked for the aluminum solid rod from some online sources but do to Online Calculators. Learn how a J-pole antenna works, what is the velocity factor, and how to mount it. We already published in the 9 J-pole-antenna-projects some samples of copper J-Pole antennas. Antenna Calculator for a Quarter Wave Antenna There are times when you may need more gain than the standard J-Pole antenna. eg. 00 – $ 50. au . It often features additional elements or modifications that optimize its ability to transmit and receive signals, making it particularly effective for long-distance communications in amateur radio and other applications. It was invented by Hans Beggerow in 1909 for use in Zeppelin airships. M = Signal wavelength (l) in meters. The calculator uses any two known values to calculate the third. This made it all to easy for us to build the antennas. 4 dB higher than the average gain of a single-radiator J-pole. The design by WB5CXC offers a balun made from RG-174 coax and a matching section of 450 ohm line. John M0UKD on Loaded Quarter Wave Antenna Inductance Calculator; KK5VN on Slim Jim and J Pole calculator; yimbo on Slim Jim and poles of 1/(x^2 + 1) Natural Language; Math Input; Extended Keyboard Examples Upload Random. 4 dBi. Enter the units of measure for each value and the calculator converts among the units. Looks like a folded dipole, but is not. 112244897959183: Inches: Stub: 2. The velocity factor on the calculator is for the J-pole itself, if you used 0. It provides dimensions for key antenna sections based on the chosen frequency and material’s velocity factor. 979591836734694: Inches: Spacing: 2. UHF OR VHF with calculator. Design your own J Pole for any band using this online tool. ). The Twinlead J-Pole Craig LaBarge, WB3GCK: In an emergency situation, it is often necessary to squeeze every bit of performance Update to Slim Jim calculator; Working Happisburgh Lighthouse on 70MHz; Recent Comments. The Slim Jim, similar to the J-pole, is in fact a half wave end fed dipole, in the Slim Jim’s case, an end fed folded dipole. It is the most effective antenna when compared to other ground plane antennas. DB, warns about the scaling of the J-Pole calculator, and the fact that your calculator does not scale correctly except at 2 meters. You may use a Fiberglas rod (arrow shaft) as an insulator, but you will have to be very careful with the torch or you may weaken or burn the rod, or make it I am needing your quick advice on what frequency I am putting into the J pole calculator. Some are saying that this particular antenna is not a J-Pole but some deviation thereof. And if you want to take it a step further, you can use antenna modeling software to simulate your antenna’s performance before you even build it. 96 I included it for use with insulated wire as elements. Covers most of the basics. Even my Eznec does not scale the element diameters to what might work in the real world if I make a big change in frequency. John M0UKD on Loaded Quarter Wave Antenna Inductance Calculator; KK5VN on Slim Jim and J Pole calculator; yimbo on Slim Jim and What I was inputting into NEC was nothing near comparable to what I and some others have measured. John M0UKD on Loaded Quarter Wave Antenna Inductance Calculator; KK5VN on Slim Jim and J Pole calculator; yimbo on Slim Jim and I have added the ability to include a known velocity factor into the Slim Jim / J Pole calculator, to help with building them with 450Ω or 300Ω feeder. Ω Ohm’s Law Calculator Ω – Enter 2 values from Voltage, Current, Power or Resistance, to find the remaining two. But there are so many things to take into consideration when building one that it becomes an all out lesson in antenna theory if you let it. More sensitive to finding the matching spot (good SWR) than the Slim Jim antenna. See Also. then instructs to do the calculation on the linked site (which was a handy little tool). 485 meters or 1 Feet 7. J Pole calculator Enter the operating frequency and calculate dimensions of your jpole antenna NEC-Win Pro Antenna Analysis software with the user in mind. Proper antenna length ensures maximum efficiency and signal strength, enabling clear communication over short to medium distances without the need for complex antenna tuning or adjustments. Clear and Free! Simple Calculator - A nice Simple Free Online Calculator. By KE4NU - Alan Wilson, Victor, MT. It simplifies the process of designing and building J-Pole antennas for specific The J-pole antenna calculator helps users design custom J-pole antennas for specific frequency bands. com/calculators/slim-jim-and-j-pole-calculator/S J-POLE VERTICAL: IN-COMPLETE CIRCUIT NO RETURN ELEMENTS •The j-pole is neither a ¼ w, ½ w or ¾ w. Read My Blog. Maximum demand calculator AS/NZS 3000. Some folks are saying that Ed Fong is selling snake oil. Since an old 5 element version (v1) of my antenna was shown in the July 2011 edition of RadCom, a few people have It's an Internet thing I reckon. Click to enlarge : Single Copper tube bent in this shape- > Use 6 Nos Elbow's at the bents for neat I have tested single-band J-Pole con-figurations constructed from copper pipe, 450 Ω ladder line, and aluminum rod. This value is about 2. John M0UKD on Loaded Quarter Wave Antenna Inductance Calculator; KK5VN on Slim Jim and J Pole calculator; yimbo on Slim Jim and J Pole calculator; Paul larner on Loaded Quarter Wave Antenna Inductance Calculator; Paul, KB1NCD on 1:1 Voltage Balun for HF Update to Slim Jim calculator; Working Happisburgh Lighthouse on 70MHz; Recent Comments. 1. (A more detailed explanation is given in my February 2003 QST article. Arduino Projects Diy. Tune Around! SEARCH CQ-Calling All Hams! About Hamuniverse Antenna Design Antenna Safety! The xls document contains a working It uses a 'J ' type matching stub (J Integrated Matching = JIM), hense the name SLIM JIM. Other calculators. Choose An Even Better J-Pole - Electrically • The gain is about 7. This small and thin design also makes it good for several stealth applications. Half wave radiator section (λ/2)*vf inches: C. the j pole antenna calculator helps users design custom j pole antennas for specific frequency bands it provides dimensions for key antenna sections based on the chosen frequency and material s velocity factor the The calculator can be used for designing a Super J-Pole antenna for just about any frequency or it can be used for the standard J Pole antenna by leaving out the top section. Antennas/J-Pole; Antennas/Antenna Calculators; The title of the main category is Antenna Calculators and it deals mainly with Antenna design calculators. However, its design can be adapted for other frequency ranges as well. 24 inches B: 0. the beginning reads to use 1. John M0UKD on Loaded Quarter Wave Antenna Inductance Calculator; KK5VN on Slim Jim and J Pole calculator; yimbo on Slim Jim and J Pole calculator; Paul larner on Loaded Quarter Wave Antenna Inductance Calculator; Paul, KB1NCD on 1:1 Voltage Balun for HF Copper Cactus Dual-Band Super J-Pole Antenna Project. That calculates A short article describing the construction of an emergency j-pole antenna made from 300 ohm TV twin lead. I So the J-Pole is simply a 1/2 To use the calculator, just enter the frequency of interest in the box provided, and then click anywhere on the page. Free Online Engineering Calculator to quickly estimate the geometric Size of a J-Pole Antenna for a given Frequency. 50Ω feed point. "Buck" Rogers Sr (68 years as K4ABT) The J-POLE has been around since the early days of HAM Radio, and is a direct descendant of the "Windom" BUXCOMM J Pole Calculation by BucK4ABT (C) 1992 Center conductor to "Long Element" and Shield to "Short Element. 4dB over isotropic (a half-wave dipole is 2. The entire band, The old J Pole looked like it was in need of a face lift and some minor surgery so rather than fix'er up, it appeared to me that the major difference between it and a Slim Jim was that it lacked the other half wave section that parallels the main element on the Slim Jim and the J Pole needed to be isolated from it's mount after the experimental Update to Slim Jim calculator; Working Happisburgh Lighthouse on 70MHz; Recent Comments. Slim Jim Antenna Calculator. Frequency (MHz): Input the frequency for calculations Velocity factor: The conductive material user for the antenna’s radiating Sure, the Slim Jim and it’s cousin, the J-Pole, can be easy beginner antennas to make. Frequency Bottom Section: super j pole calculator. The J-Pole Antenna Calculator is essential for radio enthusiasts and engineers involved in designing and deploying J-Pole antennas. See this page if you had rather use the calculator for other bands. John M0UKD on Loaded Quarter Wave Antenna Inductance Calculator; KK5VN on Slim Jim and J Pole calculator; yimbo on Slim Jim and Super J-Pole Collinear. The dimensions of A, B and C are in the table below. where: L — Length of the total dipole antenna in feet (ft);; l — Length of the arm of the dipole antenna in feet (ft); and; f — Calculator. "Buck" Rogers Sr Practical Antenna Handbook by Joseph J. Arc flash calculator IEEE 1584. The resource has been on our site since Sunday Apr 23 2017, and it has been viewed 1434 times. Build a short spaced vhf uhf collinear J Pole with very high gain. John M0UKD on Loaded Quarter Wave Antenna Inductance Calculator; KK5VN on Slim Jim and J Pole calculator; yimbo on Slim Jim and J-Pole antenna calculator – Build a cactus for any frequency. xls / . C. Currently, we have around 200 calculators to help you "do the math" quickly in areas such as finance, fitness, health, math, and others, and we are still developing more. Your j pole for 151-154 range covers MURS. However, by using copper foil tape, which is Slim Jim & J-Pole Antenna Calculator By M0UKD. Building and experimenting with antennas can be an interesting part of the radio hobby. Motor current. Rather than launching the signal for the birds, the addition of a parallel element beside the half-wave radiator forces the radiation angle to dip towards the horizon, where it is The three-phase power calculator calculates the apparent, active and reactive power for three-phase AC systems. Enter your desired frequency and get instant results with detailed dimensions for your J-pole antenna. This Very high efficiency J-Pole vertical antenna, excellent for DX activity and local traffic. Increasing current from the top of the short element has no place to go. We would like to show you a description here but the site won’t allow us. Here a collection of links to make you own dual band VHF UHF copper cactus antenna. I was so pleased with my results that I purchased enough materials to construct another J-Pole for portable use. ) First, a 2 meter antenna 1Notes appear on page 00. ) Note that if your swr is at or very near 1:5 to 1 using the starting point of 1. 3-2. Calculator explained. Voltage drop AS/NZS 3008. 2:1 or less at 146 MHz. 4NEC2 antenna modeler The J-Pole is 52" Long and features the following: Antenna Illustration Figure 2 • Written Instructions • 2 dB of gain on 2 meters; 1 dB on 440 • Includes 10 feet of flexible, high quality RG8X coax • Coax termination includes male PL-259 connector (convert to BNC with Update to Slim Jim calculator; Working Happisburgh Lighthouse on 70MHz; Recent Comments. This pattern is the focus of the Slim JIM design. Measured: Specify the measured impedance in Ohm. However, if mounted outside, then an earth ground to the conduit is recommended. How do your two meter J-Poles perform on the 440 MHz band? The two meter J-Pole is tuned for maximum efficiency at the 2 meter band where the SWR is 1. 1/2 λ, 1λ, 3λ/2, 2λ, etc. com, I took a long hard look at the old standard J Pole antenna ~ Calculator Notes ~ f o = Antenna tuned frequency in MHz. Online Abacus - An Online Abacus! Teach numbers from 1 to 50 :-) Darts Calculator - Forget the maths, and Update to Slim Jim calculator; Working Happisburgh Lighthouse on 70MHz; Recent Comments. What is a J-Pole Antenna? A J-Pole antenna is a type of radio antenna that is widely used for its high performance and simple construction. The Slim Jim is a vertically polarized omnidirectional end-fed antenna having considerable “gain” and this is concentrated almost parallel to ground toward the horizon rather Slim Jim and J Pole calculator – M0UKD – Amateur Radio Blog. (dipole), based on 95% of electrical wavelength, considering end effects. For math, science, nutrition, history, geography, engineering, mathematics, linguistics, sports, finance, music The J-Pole’s radiation pattern is more like a rounded donut shape with a 20 degree takeoff angle. John M0UKD on Loaded Quarter Wave Antenna Inductance Calculator; KK5VN on Slim Jim and J Pole calculator; yimbo on Slim Jim and J Pole calculator; Paul larner on Loaded Quarter Wave Antenna Inductance Calculator; Paul, KB1NCD on 1:1 Voltage Balun for HF a dual band J-pole? Adding a Second Band to the J pole To incorporate UHF coverage into a VHF J-pole requires some explanation. New! J POLE FOR 220 BAND REPEATERS . 725 should I use 465 MHz to calculate element length since that's essentially 6 Meter J-Pole from 450 Ohm Ladder Line A quickie project. There are many rumours on the Internet, claiming that the Slim Jim has better performance than the J Pole. f (MHz) = Signal frequency in MHz. The central hairpin separating the two 5/8, can be made with 4 mm2 hard copper wire or even with a piece of copper serpentine Antenna Calculator Links → . The result will be the length of the antenna in feet. This calculator can be used to design a Slim Jim or a J Pole antenna. Things to do. See below the Slim-Jim antenna design. The shielding of the coaxial cable attaches to the short pipe. Overall length inches (J Pole) inches (Slim Jim) B. The dimensions for the specified frequency will be displayed on the drawing. The directions do not provide sufficient Cable size calculator AS/NZS 3008. Before you build you will need: 1/2″ copper pipe used is OK, just make sure you clean it well; 3 x 1/2″ copper end caps; 1 x 1/2″ copper tee; 1 x 1/2″ 90° copper elbow; lead Beyond Analytical Formulas: Accurate Coil Inductance Calculation with AN-SOF; Complete Workflow: Modeling, Feeding, and Tuning a 20m Band Dipole Antenna Modeling a Super J-Pole: A Look Inside a 5-Element Collinear Antenna; Simulating a Multiband Omnidirectional Dipole Antenna Design; The Loop on Ground (LoG) Antenna: A Compact It is possible to make a J-pole style antenna that is resonant in both the 2m and 70cm bands used in the U. The resource has been on our site since Sunday May 24 2020, and it has been viewed 441 times. This page contains construction details on a 2 metre 144MHz VHF Yagi beam antenna, designed for portable use. A touch of Class, The Windom and the J-POLE By Glynn E. While all the designs performed well, each had shortcomings. It calculates the main section length, feed point distance, tuning stub length, and tuning stub distance in both inches and centimeters. What is the frequency range of the J-pole antenna? A typical 2-meter J-pole antenna is designed for the VHF frequency range, which includes Resource Details You will find this resource in 2 categories on our links directory. l = L / 2. Transformer current. The formulas for the ¾ wave radiator and ¼ wave stub are: L ¾ wave radiator = around plans for a “simple J-Pole” As I was giving out a link to one for the Ohio VHF+ Simplex Contest I wondered how easy it really was to build since I’d never actually done it Every plan I looked at had one of two deficiencies: 1. An omni-directional end-fed half-wave antenna with a quarter-wave transmission line matching stub. 2 J-Pole Antenna Calculator. Some folks fiddle with the tuning of the J-pole elements and get it close. Invented by the Germans for use on their zeppelins, this antenna is also referred to as a Zepp antenna. Resources listed under Antenna Calculators A: While J pole antennas are efficient and easy to construct, they may not be suitable for all applications, particularly those requiring directional radiation patterns. The Frequency you entered: 146. This great page at w8ji. dipole formula tip dipole tuning made easy! kl7jr radial ring antenna wire sizes ht antenna modification more performance using simple mod building antenna coils technique by k4mmg hustler btv series trap calibration J-Pole Antenna Calculator. 94 MHz Measurements(95% Velocity Factor for Copper Pipe): A: 1. The copper pipe J-Pole matching section would be exposed to the The DBJ-1: A VHF-UHF Dual-Band J-Pole Searching for an inexpensive, high-performance dual-band base The 2-m-J-Pole can be used on 70cm, too with an SWR <1,6. SUPER J-POLE FOR 435MHz. " One is for 144 to 148 mHz Before you jump into building, it’s helpful to use a J-pole antenna calculator. Zepps are 1/2 wavelength end-fed antennas, named after the German Zeppelin dirigibles where they were used. Prospective earth fault current (kA): Specify the prospective earth fault current on the primary side of the circuit breaker. Since the vertical angle of radiation is so narrow, about 8 degrees toward the horizon, it How to build a 2m J Pole AntennaHere's a calculator if you don't want to do the math yourself: https://m0ukd. The Super J Pole yields about 6dB gain + - over a 1/4 wave Refer to your j-pole calculator results to figure out how far up the wires need to be attached. Credit for the original design goes to F. They have quite a few advantages which include improved performance for HTs, portability, and low cost. Kinetic Energy Calculations Used Here:. Compute answers using Wolfram's breakthrough technology & knowledgebase, relied on by millions of students & professionals. Carr Design by G. Motor torque. Frequency Bottom Section: Basic J-Pole Antenna for the 220mHz Band (1. 932 inches* Copper J-Pole: Frequency: 147: MHz: Total Length: 60. Calculate the required dimensions for a Slim Jim antenna construction for any given frequency. Cubical quad antenna calculator in java script let you calculate elements size and spacing in inch and meters. does resonate at UHF. 5 dB The J-Pole does not require any ground radials and has a antenna gain of 2. Enter the required frequency in MHz and The J-pole has another advantage: the main radiation from the antenna begins where the dipole portion is above the two-legged matching section. The formulas used for designing a J Pole antenna J Pole Antenna Calculator. Design your own J-pole antenna for any frequency band with this online tool. The Copper Cactus J pole I then calculate length pairs for that band's 1/2 λ multiples (. Point P represents a complex number. It works on the principles of electromagnetic waves and frequency. Has better performance than the j-pole antenna. 5 meter of ribbon feed cable. John M0UKD on Loaded Quarter Wave Antenna Inductance Calculator; KK5VN on Slim Jim and J Pole calculator; yimbo on Update to Slim Jim calculator; Working Happisburgh Lighthouse on 70MHz; Recent Comments. 80 . John M0UKD on Loaded Quarter Wave Antenna Inductance Calculator; KK5VN on Slim Jim and J Pole calculator; yimbo on Slim Jim and J Pole calculator; Paul larner on Loaded Quarter Wave Antenna Inductance Calculator; Paul, KB1NCD on 1:1 Voltage Balun for HF The J-Pole calculator does the math to find that 50-ohm impedance point In this case it is used to match the coax impedance to the open end of the ½ wave antenna This is just like using a balun to match 50-ohm cable to the end of a EFHW HF antenna . It takes into account various parameters to ensure optimal antenna performance and signal clarity. Its primary function is to calculate the lengths required for constructing a J-pole antenna, a popular The J-Pole Antenna Calculator is a sophisticated tool that simplifies the complex process of designing J-Pole antennas. Creative Life Hacks. txt) or read online for free. As with all folded dipoles, the currents in each leg are in phase, whereas in the matching stub they in Actual wavelength: inches: Wavelength considering velocity factor: inches: A. Building Suggestions. This antenna does not need a ground to operate correctly. Antenna jpole Links → . The J-Pole does not need a ground plane to operate. Antennas/Antenna Calculators; Antennas/J-Pole; The title of the main category is J-Pole and it deals mainly with Building J-Pole amateur radio antennas. The J-pole Calculator is a tool designed for individuals involved in antenna design and radio frequency engineering. 00; Snap-on Ferrite Beads 11mm (set of 3) $ 9. On-line antenna designer. The key word here is Figure 1 — The original 2 meter ribbon J-pole antenna. At least one of the key parts is not a “common” part 2. For copper tubing, leave it at 0. Protection. In the following graph, the real axis is horizontal, and the imaginary (`j=sqrt(-1)`) axis is vertical, as usual. Where do I mount my J-pole antenna? Mount your J-pole antenna at a height of 15 to 20 feet above ground for best results. Test and adjustment. Also, here is a tested and reproducible Slim Jim for 70MHz (4m) made with slim Jim and J Pole calculator. C Bronson Crothers (AA1ZB) has talked CONVERTING A 2 METER J POLE INTO A SLIM JIM ANTENNA By Don Butler N4UJW Having recently posted the 2 Meter Slim Jim antenna project to Hamuniverse. Here we have collected some links to building instructions for 11m antennas on the Internet. By understanding the formula, following the usage instructions, and keeping in mind the FAQs, you can harness 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. Calculate the dimensions for a Slim Jim or J Pole antenna for HF, VHF or UHF - Including velocity factor! sabek. Slim Jim vs J Pole. Judd, G2BCX. It uses a matching system similar to j-pole antenna. The J-Pole is very sensitive to conductive support structures and will achieve best performance with no electrical bonding between antenna conductors and the mounting structure (Built from old j poles) New! WB3AYW WIRE COLLINEAR A High Gain Omni Vertical for 2 Meters. 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 core or center of the coaxial cable attaches to the long pipe. It typically handles 100-200 watts of power, should be mounted at least 1/2 wavelength above ground, and exhibits omnidirectional radiation. SWR 145-146 MHz <1,5. E. What is the frequency range of the J-pole antenna? A J-pole antenna is often used for the 2-meter amateur radio band, which operates around 144-148 MHz. Ham HAM Radio India VHF Super J-Pole Collinear Antenna Calculator Jpole J pole. KG7GTE 2 METER SLIM JIM A first time builder shares his fun! The Vent Pipe "Lightning J-antenna online calculator; Patch antenna online calculator; Amos antenna online calculator; Quados antenna online calculator; Cantenna online calculator; Bowtie antenna online calculator; Bi-loop antenna online calculator; To calculate the length of a J-Pole Antenna, divide 468 by the frequency in MHz. CQ India - VHF Collinear Super J Antenna: Calculator. Does a J-pole antenna need a ground plane? No, a J-pole antenna does not require a ground plane, which is one of its advantages as it can be used in situations where a ground plane is not practical. Easy to use and read. Sketch copied from WB5CXC web page. [2] Trailed behind the airship, it consisted of a single one half wavelength long wire radiator, in series with a quarter-wave parallel transmission line tuning The calculator above will give you a good starting point, although spacing between the elements, velocity factor and other differences will have an effect on where this actually is. I calculate one length for the low end of the band and another for the high end (Length Low = 468/F LOW, Length_High = 468/F HIGH). You may use a Fiberglas rod (arrow shaft) as an insulator, but you will have to be very careful with the torch or you may weaken or burn the rod, or make it Update to Slim Jim calculator; Working Happisburgh Lighthouse on 70MHz; Recent Comments. This handy tool can help you determine the optimal dimensions for your antenna based on your desired frequency. Forrest Cook WB0RIO. In 1936 J Pole calculator Enter the operating frequency and calculate dimensions of your jpole antenna 144-430 portable j-pole antenna A portable dual band j-pole antenna 2 Meter J-pole from 450-Ohm Ladder Line Great first time J-pole project. Also, here is a tested and reproducible Slim Jim for 70MHz (4m) made with stub-j-pole-project-completed-many-times, Jeff had the same idea as we did. 5:1 at both 146 and 444 Mhz. Learn the principles behind J-pole design and improve your radio communication The J-Pole Antenna Calculator is an invaluable tool for radio enthusiasts and communication professionals. Thankfully I wasn’t the only one who was having issues modeling a J-Pole. The main current is about half-way up the free and clear dipole section. KF4EOK'S 2 meter super j-pole antenna build SUPER J-POLE FOR 435MHz by VK6YSF The World Wide Web Prepared By Paul Howarth VK2GX Email: vk2gx@wia. The calculator can be used for designing a Super J-Pole antenna for just about any frequency or it can be used for the standard J Pole antenna by leaving out the top section. John M0UKD on Loaded Quarter Wave Antenna Inductance Calculator; KK5VN on Slim Jim and J Pole calculator; yimbo on Building and experimenting with antennas can be an interesting part of the radio hobby. Calculate: Calculate from the prospective fault current. Before we start, be prepared to experiment! The calculator will get you close or spot on if you’re lucky, but there are so many variables. Decoding the J-Pole Antenna Design Formula A Twin Lead J-Pole Antenna is a simple yet effective antenna often used in amateur radio. S. The antenna can be mounted almost anywhere. Resource Details You will find this resource in 2 categories on our links directory. Voltage (V) Current (A) Power factor. As shown in the drawing, the entire antenna is made from 1/2" rigid copper tubing. of the frequency spread of interest? And if so, since GMRS is between 462. The SmarTech 27VJ is a vertical polarization antenna, completely redesigned and optimized for maximum electrical and mechanical Update to Slim Jim calculator; Working Happisburgh Lighthouse on 70MHz; Recent Comments. 00; I'm on a mission to inspire and educate the amateur radio community. It is a pretty good performer on the UHF band where the NOAA Weather / Railroad Band 160 – 162 Mhz J-Pole Antenna $ 46. SWR 430-440 MHz <1,6. net's sole focus is to provide fast, comprehensive, convenient, free online calculators in a plethora of areas. Antennas J-POLE: Click ↓: Votes ↓: Flag ↓: 2m-70cm antennas super jpole, VE3ELB Update to Slim Jim calculator; Working Happisburgh Lighthouse on 70MHz; Recent Comments. •With the stub match the shield voltage is raised, thus ‘hot’ carrying RF thus stray RF. Listed under the Antennas/Antenna Calculators category that is about Antenna design calculators. In the UK our frequencies for CB are around 27 – 29 MHz. Sometimes referred to as a folded zepp. 66 on the calculator the antenna will be too short. A J Pole is a simplified version of the Slim Jim antenna, ideal for mounting inside PVC piping and performing well for RX and TX purposes. Antenna design calculators category is a curation of 111 web resources on , HB9CV Online Antenna Calculator, 3-elements Yagi-Uda online calculator, RF Toroid Calculator. Cable sizing calculator AS/NZS3008; Maximum demand calculator Update to Slim Jim calculator; Working Happisburgh Lighthouse on 70MHz; Recent Comments. How do I know what my average terrain I know that such a matching network is possible because that is exactly what the traditional j-pole antenna is: a single-stub impedance transformer feeding a half-wave antenna, where the matching section impedance doesn't Figure 1A – Franklin Array Stub [5] – Simple 1/4 wave stub My original version of Hiking 2m J-Pole uses a simple bent pipe phasing stub 1/2 wave in total length or about 1/4 wave “stub” length. Attention: The mounting in a plastic pipe or with tape on a fishing rod j Pole Calculator - Free download as Excel Spreadsheet (. 25 Meter band) (These lengths and measurements were taken from the J pole antenna calculator on this page. The Super J Pole yields about 6dB gain + - over a 1/4 wave The J-Pole Antenna Calculator is an invaluable tool for radio enthusiasts and communication professionals. 049 meters or 0 Feet 1. This calculator helps users determine the dimensions necessary to construct a properly tuned J-Pole antenna for their desired frequency, ensuring effective transmission and Calculate the dimensions of a J Pole antenna for any given frequency using this online tool. If installed per the dimensions above, the antenna should have an SWR of less than 1. 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 The antenna length formulas used in our dipole length calculator are as follows: L = 468 / f. post 06 Dec 2024. org. 550 and 467. He decide to redraw the plans and he provided all of the needed dimensions. Super J-Pole I have added the ability to include a known velocity factor into the Slim Jim / J Pole calculator, to help with building them with 450Ω or 300Ω feeder. You can use the The 450 OHM Ladder Line Slim Jim Antenna. 159 . Antennas/J-Pole; Software/Antenna analysis; The title of the main category is Antenna analysis and it deals mainly with software,antenna analysis software, for ham radio operators and hams. Enter the operating frequency and get the dimensions for the long and short sections, the feed point and the spacing. What freq do I put into the calculator to get my best lengths to build the j pole? You also Full Screen Calculator - The Online Calculator that can be used free and full screen; Scientific Calculator - A great Scientific Calculator. Online physics calculator that calculates the long, short section, feed point, spacing dimensions values for current frequency. Slim Jim Antenna was designed by late Fred Judd. Indeed, although many folks like to bandy the gain advantage of a collinear arrangement as 3 dB greater than a single section, we rarely obtain in real antennas more than about a 2. The antenna I constructed was made of 1/2" tubing. So if you are in a low spot, the lower gain J-Pole will actually give you better coverage. Online calculators for designers, engineers, scientists, and the scientifically curious Copper Cactus Dual-Band Super J-Pole Antenna Project. 21258503401361: Inches: To Notch: 20. John M0UKD on Loaded Quarter Wave Antenna Inductance Calculator; KK5VN on Slim Jim and J Pole calculator; yimbo on Slim Jim and J Pole calculator; Paul larner on Loaded Quarter Wave Antenna Inductance Calculator; Paul, KB1NCD on 1:1 Voltage Balun for HF The Copper-Duct Tape J-Pole Antenna: The traditional J-Pole antenna often employs rigid materials like copper tubing which, while effective, can be cumbersome and costly. J-Pole antennas for 2m-40m with Wireman-cable pole. N9TAX claims that his roll-up J-poles are resonant in both bands. com shows field charts for J-Poles with small differences in build where the low angle gain can vary by 5dB. Some folks, like Arrow Antennas, add elements to their J style antennas to get resonance in The Kinetic Energy Calculator uses the formula KE = (1/2)mv 2, or kinetic energy (KE) equals one half of the mass (m) times velocity squared (v 2). In conclusion, the J pole antenna calculator presented here offers a convenient tool for engineers and enthusiasts alike to efficiently design and optimize J pole Like all antennas, the J-pole is sensitive to surrounding electrically conductive objects and should maintain sufficient separation to minimize near field interactions. The resource has been on our site since The J-pole antenna, more properly known as the J antenna, [1] is a vertical omnidirectional transmitting antenna used in the shortwave frequency bands. 092 inches C: 0. Portable Antenna Calculator for a Slim Jim Antenna. WiFi Antenna Calculators Enter the The J-Pole is an excellent antenna for emergency communications. Free roots calculator - find roots of any function step-by-step Antenna design. pdf), Text File (. John M0UKD on Loaded Quarter Wave Antenna Inductance Calculator; KK5VN on Slim Jim and J Pole calculator; yimbo on Slim Jim and The following is a description of a J-Pole antenna made from 300 ohm TV twin-lead. L = Length (feet) of a 1/2 wave ant. Update to Slim Jim calculator; Working Happisburgh Lighthouse on 70MHz; Recent Comments. xlsx), PDF File (. The Super J Slim Jim Antenna dimension calculator Back to Antenna calculator overview. The effect is the an online j pole antenna calculator that need just to input the frequency and calculates in inch size of each element. This second one has a threaded section in the middle of the long element to allow disassembly, and The J-Pole is a end-fed halfwave dipole. Conclusion. It is named for its unique shape that resembles the letter ‘J’. VSWR = Voltage Standing Wave Ratio (n). Small area antenna, ideal for (hidden) placement in PVC pipes. This document provides a calculator and instructions for building a J-pole antenna based on the frequency entered. Normal operation places Antenna J-POLE 50 mhz 145 mhz sizing calculation. Quarter wave matching section (λ/4)*vf inches: D. P r = Reflected Power (%), expressed as a percentage of the incident power for a specific The J-Pole, when properly fed and mounted, exhibits a vertical radiation angle about 30 degrees from horizontal. 454 meters or 4 Feet 9. A Super J-Pole antenna is an improved version of the J-Pole antenna, designed for enhanced performance with a lower radiation angle. How Does the J-Pole Calculator Work? The calculator J Pole Calculator and drawing by K4ABT G. 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. . J-Pole Antenna JavaScript Calculator for CB and Amateur Radio Communications Enter the center frequency: mHz 1/2" Copper - The J Pole Antenna - The lengths and measurements used in this article came from using the K4ABT calculator. Adjust for 1:1 SWR. It’s just coincidence that you get good match with just the centre connected, there will be lots of RF on the feeder though. Motor speed. 0-2. Learn How to Calculate Jpole Antenna - Definition, Formula and Example Definition: Jpole antenna is nothing but an omni-directional antenna having a configuration similar to 'J' and it consists of a half-wave antenna end-fed by a parallel-wire quarter-wave segment. It has two electric poles charged positive and negative. 1dB gain over isotropic). Basically you have a half wave 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. This is because Eznec and you caluclator uses a frequency ratio equal to the element Interactive Graph - Convert polar to rectangular and vice-versa. Want to homebrew an antenna for 2M? Want something that actually works well? 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 simplifies the process of designing and building J-Pole antennas for specific frequency bands, ensuring optimal performance. A J-Pole calculator is a mathematical tool used to optimize the dimensions of a J-Pole antenna. 1/4 Wave Ground Plane antenna calculator – Build a simple quarter wave with radials. nzbw rgvvox hpf rjvsm nwdm whopmc zkmb gjnm wbeapajk nxt