Explaining End Fed Half Wave Antennas & Experimentation

23 October, 2020 - Reading time: 4 minutes

This presentation explaining the basics of End Fed Half Wave (EFHW) antennas was done at the DATV experimenters night hosted by Justin VK7TW and Hayden VK7HH. Topics covered were the basics of EFHW antennas by Steve Yates AA5TB including lengths, design and installation of the antenna. Voltage and current distribution and the issues this presents, the minimum counterpoise, impedances and turns ratios of end fed impedance transformers.

Hayden VK7HH then took the audience through a great presentation on his experiments with his EFHW. Hayden covered the modification based on the VK4YE design, the testing, and the additional 80m loading coil, the coax counterpoise, and the common mode toroids. This allows a antenna for smaller spaces.

References:

Steve Yates – AA5TB http://www.aa5tb.com/efha.html

http://www.aa5tb.com/efha_wrk.html

http://www.aa5tb.com/coupler.html

Ben - VK7BEN

https://www.vk7ben.id.au/2017/01/09/experiments-with-an-end-fed-half-wave-antenna/

VK4YE

http://sarc.org.au/wp-content/uploads/2015/07/VK4YE-End-Fed-Antenna-Construction-Project.pdf

Steve Dick - K1RF (The End Fed Half Wave Antenna)

http://gnarc.org/wp-content/uploads/The-End-Fed-Half-Wave-Antenna.pdf