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Antenna Helix 435 MHz
It's actually 9.25 turns, including the quarter-turn impedance transformation to get a 50 ohm feed
post 09 Feb 2024
Helix Antennas Links →
Long range wifi with helical antennas
Helicals can be made with only household parts, a hot glue gun and a soldering iron
Helical antenna Wikipedia
This 50 ohm impedance antenna allows, when powered with 25-100W of RF in SSB, to reach satellites with Molniya orbit like AO-40 and AO-10
Helical Feed Antennas
Helical antennas have long been popular in applications from VHF to microwaves requiring circular polarization, since they have the unique property of naturally providing circularly polarized radiation
Helical Antenna
Axial-mode Helical Antenna
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Helicals can be made with only household parts, a hot glue gun and a soldering iron
This 50 ohm impedance antenna allows, when powered with 25-100W of RF in SSB, to reach satellites with Molniya orbit like AO-40 and AO-10
Helical antennas have long been popular in applications from VHF to microwaves requiring circular polarization, since they have the unique property of naturally providing circularly polarized radiation
Axial-mode Helical Antenna
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 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 An SWR meter provides information about how well matched is your antenna with the transmitter and how well power is being radiated