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Two Small Helical Antennas for 2 Meter


Two Small Helical Antennas for 2 Meter

The two turn 2 meter base-station λ/2 helix. Height is 6 inches, diameter is 6 inches

post 12 Jul 2024


Helix Antennas Links

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Helix calculator
Sophisticated Helix Antenna Design,with matching Coax to 50 Ω

Illuminate an offset parabola 80 cm
CM Helix, SatNOGS, v4, CM Frequency: 434 MHz, CM Wavelength: 691 mm, CM c=299792458 m/s, CM Radius = 110 mm, CM Turns: 8

MHz Helical Antenna
I decided to build a pair of helical antennas, one for each circular sense. Helical antennas have broad bandwidth, loose construction tolerances, and for 900 MHz, wouldn't be too big

New Helix Antenna Design
Reflector Loop Dia: 10.66" The reflector is positioned 0.375" ahead of the start point of the first helix turn, first 4 Turns: 10.32", Next 7 Turns: 8.68", Last 12 Turns: 8.40


Linear-loaded-short-dipole-21mhz

Linear loaded short dipole 21Mhz For my amateur radio activities on the HF bands I only have a 3.6 m wide balcony available for antennas. After some study I decided to experiment with a shortened dipole for the 15 m band

Rx antennas 4Square Rx Vertical Array

Rx antennas 4Square Rx Vertical Array My frequency design of 1.825 MHz a 90 degrees line would be 33,70 metersinstead of the previously calculated 33,27 m

A simple SWR Meter is to be used at HF

A simple SWR Meter is to be used at HF An SWR meter provides information about how well matched is your antenna with the transmitter and how well power is being radiated