pi match

pi match

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• 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 ]

• Hairpin match for the 5 elements Tonna for 6 meter - How to improve the gain of your 5 element Tonna yagi for 50 MHz by roughly 3 db!
  [ Hits: 2435 | Votes: 6 | Rating: 6 ]
• A Hairpin match for 5 el. Tonna - An interesting modification to improve the gain of your 5 element Tonna Yagi beam for 50 MHz by roughly 3 db!
  [ Hits: 1962 | Votes: 3 | Rating: 5.67 ]
• Six Meter Yagi Beam - Article describing how to homebrew a yagi antenna for 50 MHz, includes plans for a four and five elements yagi beam and details how how match impedence with a gamma match
  [ Hits: 1039 | Votes: 3 | Rating: 4.33 ]

• 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: 591 | Votes: 1 | Rating: 6 ]

• End Fed Half-Wave Antennas - An interesting article on end fed half-wave wire antennas with a couple of original experiments. Author illustrate the role of the QRP matchbox, and a 40/20 meter antenna with a center stub making it a large bandwidth antenna for 40 and 20. Includes also an 80/40 end fed with the typical coil to make it available on 80 merts band.
  [ Hits: 288 | Votes: 2 | Rating: 10 ]
• QRP End-Fed for 40m 20m 10m - This antenna build was strongly inspired by the well known PAR end fed antenna. The matcher box uses a T82-43 Fair-Rite core.
  [ Hits: 170 | Votes: 3 | Rating: 9.67 ]

• SWR: Maximum allowable VSWR - VSWR (voltage-standing-wave-ratio) represents the degree with which an antenna is "matched" to the system impedance. Most modern antennas do not require any tuning for optimum performance. VSWR is one of the easiest parameters to measure and VSWR meters are becoming very popular antenna installation tools
  [ Hits: 1240 | Votes: 3 | Rating: 3.33 ]

• 5 Band Telescopic Vertical Antenna - 5 Band 1/4 wave Telescopic Antenna. The 20m to 10m, antenna is simple and cheap to make, and has a performance that matches commercial antennas but at cost considerably lower. The design was purposely based on a telescoping fibre glass fishing rod as this allows it to be easily stowed away in the car.
  [ Hits: 3607 | Votes: 3 | Rating: 9.33 ]

• 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: 804 | Votes: 1 | Rating: 9 ]

• 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: 6689 | Votes: 4 | Rating: 6 ]

• Beta Match - Hairpin, Stub affecting the element - The efficiency of Beta matched elements in antennas by K3BU
  [ Hits: 1252 | Votes: 4 | Rating: 4.5 ]
• 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 ]

• 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: 7826 | 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: 15346 | Votes: 7 | Rating: 5.14 ]
• 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: 204 | Votes: 0 | Rating: 0 ]

• 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: 3962 | Votes: 4 | Rating: 7.75 ]

• 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 ]

• 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: 469 | Votes: 4 | Rating: 5.25 ]

• 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: 101 | Votes: 0 | Rating: 0 ]

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