pi matching

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pi matching

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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 ]
Antennas : Delta loop
  • 2 Elements 20m Delta Loop - A 2 elements delta loop antenna for 14 MHz with a MMana simulation file, dimensions, pictures of this aluminium tube based delta loop antenna, and matching system details.
    [ Hits: 584 | Votes: 1 | Rating: 6 ]
Antennas : Patch
  • The Basics of Patch Antennas - This article explores the basic concepts of patch antennas. Topics include principles of operation, impedance matching, radiation pattern, circular polarization, bandwidth, efficiency, alternative feed types, stacked patches and higher mode behavior.
    [ Hits: 802 | Votes: 1 | Rating: 9 ]
Antennas : Portable
  • Portable Half-Square Antenna: - The author explores a portable version of the half-square antenna, typically a single-band structure. Using a 9:1 unun for versatility, they describe construction with speaker wire, deployment using collapsible poles, and field tests, achieving successful contacts on multiple bands. The article suggests efficient matching methods and concludes with the antenna's integration into the author's portable options.
    [ Hits: 90 | Votes: 0 | Rating: 0 ]
Antennas : Receiving
  • Broadband receiving antenna matching - This article addresses the subject of obtaining the best signal transfer from an antenna to the typical 50-ohm receiver input over a wide frequency range, with emphasis on medium-wave (500 - 2000 kHz), encompassing the standard AM broadcast band and the 160-m amateur band.
    [ Hits: 6682 | Votes: 4 | Rating: 6 ]
Antennas : Tuners
  • A Multi-type "one-box" Antenna Tuner - This antenna tuner is a multi-type matching system in the same box, which includes L - Pi and T networks.
    [ Hits: 7822 | Votes: 3 | Rating: 9.67 ]
  • A Portable Antenna Matching Unit - A small HF antenna tuner project for qrp operations. Includes circuit diagrams pictures and test results by GW4ALG
    [ Hits: 15338 | Votes: 7 | Rating: 5.14 ]
  • Budget-Friendly QRP T-Tuner and SWR Bridge - In the pursuit of an affordable matching and SWR indication solution for the Pixie-based transceiver system this T-Tuner and SWR bridge unit, while not groundbreaking, proves to be a cost-effective performer. With real-world impedance testing yielding a worst-case loss below 0.9 dB, the unit efficiently matches all bands on 80 M to 10 M ham bands, making it a valuable addition to the QRP system.
    [ Hits: 49 | Votes: 0 | Rating: 0 ]
Antennas : Vertical
  • 6m Half wave vertical - This antenna is very useful for receiving or scanning purposes, but you can use it for transmitting, too. It is 2,94m long and has a pi-configuration (Collins-Filter) for the matching.
    [ Hits: 3960 | Votes: 4 | Rating: 7.75 ]
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: 79 | Votes: 1 | Rating: 2 ]
Software : Linux
  • Fcc Lookup System - The FCC Lookup System software uses the standard FCC data files in an advanced lookup system for matching a call sign to a user. The software creates index files to allow rapid searches without modifying the FCC data file. Available for both Windows and Linux.
    [ Hits: 1164 | Votes: 2 | Rating: 1 ]
Technical Reference : Attenuators
  • RF Attenuator Calculator - This is an on-line rf attenuator calculator provided free in order to promote the FLEXI-BOX. Calculates the resistor values, attenuation, minimum attenuation, impedance, reflection coefficient, VSWR and return loss of a matching Pi attenuator
    [ Hits: 464 | Votes: 4 | Rating: 5.25 ]

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