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The Quarter-wave stub


A quarter wave length of a transmission line can also be used as an impedance transformer
post 05 Dec 2024
The Quarter-wave stub

Antenna Calculator Links

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Impedance Calculators
These calculators are used by Mantaro engineers and provided freely for your use

J-pole antenna design calculator
For 2 meters, the coil is 4 turns of coax at 5 inches in diameter

J Pole Antenna dimension calculator
The J Pole antenna is a simplified version of the Slim Jim antenna, using the same matching stub principle

Log periodic dipol array
Detail of the end-fed feed of a VHF log periodic dipole array


Microsat

Microsat Ham radio shop for ulari project, aprs, aprs with radio, bluetooth, gps, gsm, ham radio interfaces, weather,accessories, cables to radio

Kits and Components

Amateur radio kits by Kanga US

Enigma Component Shop

Enigma Component Shop Cable & wire,capacitors, connectors, crystals/oscillators, filters, hardware,kits/modules,test & measurement