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A New Helix Antenna Design


Gain: 15.9 dBci approximately 1 to 1.5 dB better than the standard Helix antennas I have modeled, pattern: First Side lobes at 36 degrees down 14 dB Average of all remaining sidelobes <25 dB, bandwidth: <0.2 dB variability from 432 to 438 Mhz 50 Ohm Match at <1.2 VSWR from 432 to 438 Mhz
post 18 Dec 2021


Antenna for UHF VHF Links

163



A Portable Antenna for Mode B and J Satellites
A 4:1 balun, constructed out of a 1/2 wavelength of RG-58 coax is used to couple the T match to the 50 ohm feedline

A Quadruple Helix for AO-40
16 turn helix antenna for 2.4 GHz by G3RUH. Gain is 15.5 dBic, RHCP. The boom is 1/2 inch square aluminium stock, the helix is 1/8-inch copper wire inner conductor of coax cable

A turnstile antenna for 2-meter ARDF
Designed by Jay Hennigan, WB6RDV, these are the same type of antennas I've been using for about seven years for both championship and practice ARDF These are horizontally polarized omindirectional antennas as specified in the IARU R1 ARDF rules

Antena Direcional para UHF - 430 - 450mhz
The boom should be aluminum and rectangular. The diameter used in the antenna tested for this project was 2x2 cm and the total length was 1.80 meters

Antenna for 2m and 70cm
Small antenna for 2m and 70cm, after using it you can roll-up the antenna, very nice on holidays

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