j match

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j match

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Antennas : 6M : 6 meter J-Pole Antenna
  • The Ugly MacGyver 6 meter J-pole Antenna - Essentially, a J-pole is a 1/2 wave resonant antenna connected to a quarter wave matching stub. The feedline is connected at a point on the matching stub that is at the feedline's characteristic impedance. The result is 3/4 of a wavelength on one side and 1/4 wavelength on the other side.
    [ Hits: 202 | Votes: 0 | Rating: 0 ]
  • 50MHz / 6m J-pole Antenna by VK4ADC - The J-Pole is an easy-to-build and inexpensive device that provides an omni-directional vertically polarized antenna without the need for a ground plane. In technical terms, it is an end fed vertical 1/2 wave which is fed via a 1/4 wave matching stub.
    [ Hits: 439 | Votes: 4 | Rating: 6 ]
  • J-Pole Antenna for 50 MHz - This J-Pole is mounted on a fishing rod. The radiator L1 is an isolated copper-wire with a length of 281,5 cm while the quarter-wave matching sector L2 is made with 450-Ohm-Wireman-cable
    [ Hits: 222 | Votes: 0 | Rating: 0 ]
  • Half-Size 6 meter J-antenna - How to use a little known J-antenna characteristic to reduce a conventional 14 foot antenna to 7 feet. Perfect 50 Ohm match, same gain, no radials.
    [ Hits: 62 | Votes: 0 | Rating: 0 ]
Antennas : Magnetic Loop Antennas : Multiband
  • Short Antenna for 40-30-20 Meters Band - This page describes an entirely simple, One-Knob matchbox that will match this antenna efficiently on 40, 30 and 20m, using a simple circuit that can be switched between series-resonant and parallel-resonant with just one banana jumper
    [ Hits: 235 | Votes: 1 | Rating: 7 ]
Antennas : OCF
  • Tuning OCF L-Dipoles - The behavior of a straight dipole and its L-form is examined in terms of impedance and SWR. By adjusting the feed point or bending angle, impedance variation is observed. Impedance shifts symmetrically as the feed point deviates, leading to recommendations for optimal ratios. Model simulations aid in understanding and fine-tuning, crucial for achieving a 50 Ohm match. Practical tuning guidelines ensure efficient antenna performance.
    [ Hits: 28 | Votes: 0 | Rating: 0 ]
Antennas : Theory
  • Stacking, Phasing and Matching Yagi Antennas - This is a synopsis of a talk presented to the Sydney VHF DX GROUP by VK2ZAB on how, when and why is convenient to build a Yagi antenna stack.
    [ Hits: 239 | Votes: 2 | Rating: 10 ]
Antennas : Theory : Antenna Gain
  • The Easy Way Antenna Systems - This document is a must read for anyone considering building a good low cost HF multi-band antenna system. The author combine in this document four important ingredients to produce simple but effective antenna system, like antennas of non resonant length, line attenuation, the transmatch and the balun
    [ Hits: 628 | Votes: 2 | Rating: 4.5 ]
Antennas : Theory : Impedance matching
  • Adjusting HF Yagi Gamma Matches - There are many feed systems used in yagis over the years. Gamma matches are not as common as they once were. More typical are beta matches and T matches to convert the low impedance of a yagi to 50 ohm.
    [ Hits: 132 | Votes: 1 | Rating: 10 ]
Antennas : Tuners
  • A QRP Transmatch ATU - A home made Antenna Tuner made with a simple inductor and a few spare parts. Despite the title, the author succesfully tested this ATU with higher power inputs.
    [ Hits: 203 | Votes: 0 | Rating: 0 ]
  • The SPC Tuner - SPC, series parallel capacitance, tuner project. Built properly, it will match a very wide range of impedance. It also maintains good harmonic attenuation.
    [ Hits: 154 | Votes: 0 | Rating: 0 ]
  • Homebrew Z-Match Transmatch - For this project, I decided to try my hand at building a Z-Match tuner from scratch. This type of tuner has been around for a while. While the Z-match can take on several variations, what distinguishes it from other circuits is that it is a resonant circuit that uses a fixed inductor.
    [ Hits: 132 | Votes: 0 | Rating: 0 ]
  • QRP Z Match Antenna Tuner Project - A Home made antenna tuner for QRP transceivers. This small tuner is the ideal for portable operations with random length wires or whenever you have not a resonant antenna.
    [ Hits: 107 | Votes: 1 | Rating: 10 ]
Radio Equipment : HF Transceivers : Yaesu FT-817
  • Yaesu FT-817 Audio Enhancement: Heathkit-inspired Homebrew Project - Inspired by Heathkit, author aimed to enhance his Yaesu FT-817 with audio and RF processing. Design goals included a compact enclosure, PCB simplicity, matching jacks, a visual meter, and a built-in signal generator. Despite challenges in finding a suitable compressor IC for a 5V DC mic jack, he chose the Analog Devices SSM2165/2166 series. Prototyping with a solderless breadboard, author planned a PCB layout for its versatile performance in communication use.
    [ Hits: 80 | Votes: 1 | Rating: 2 ]
Technical Reference : 3D Printed Projects
  • 3D Printer Makes Ham Antenna Portable - An end fed antenna winder design that also contains the necessary matching toroid. This would be just the thing to throw in your backpack for portable operation.
    [ Hits: 214 | Votes: 0 | Rating: 0 ]
Technical Reference : Amplifiers : HF Amplifiers
  • Building a Robust PL519 Tube HF Amplifier - his article explores the construction of a PL519 tube amplifier, utilizing Ulrich L. Rohde N1UL's insights. Focusing on a modest 25W continuous output, the design ensures robustness with forced air cooling. The detailed breakdown covers input matching, screen grid voltage generation, bias adjustment, anode power supply, heater power supply, and monitoring circuitry, providing valuable guidance for ham radio enthusiasts.
    [ Hits: 42 | Votes: 0 | Rating: 0 ]
Technical Reference : Calculators
  • RF Impedance Matching Calculator - Calculates the network to match a line to a specific complex load. This online tool calculates the matching network necessary to terminate a line of the specified characteristic impedence Zo in a specific complex load impedence RL + jXL at a specified frequency.
    [ Hits: 192 | Votes: 1 | Rating: 10 ]
Technical Reference : SWR Meters
  • Retro SWR Project - Analysis, design and construction of a simple & useful SWR meter from yesteryear! Schematic diagram, pictures and instructions to build a Monimatch style SWR Meter
    [ Hits: 99 | Votes: 0 | Rating: 0 ]

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