Explaining End Fed Half Wave Antennas & Experimentation

This presentation explaining the basics of End Fed Half Wave (EFHW) antennas was done at the REAST 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

http://reast.asn.au/

⏱️TIMESTAMPS⏱️
0:00 Explaining End Fed Half Wave Antennas & Experimentation
1:06 Voltage and Current Distributions
2:55 What are End Fed Half Wave Antennas?
4:24 Counterpoise or no Counterpoise
7:29 Son of Counterpoise
8:47 How to Make a EFHW Work - Tuning
10:59 Coupler Learnings - Counterpoise and SWR
12:42 AA5TB Musings
13:45 Extending this to other Antennas
15:53 VK7HH Introduction - 5 Band End Fed Design by VK4YE
18:18 EFHW Layout
19:12 49 to 1 Impedance Transformer build
20:45 80 Meter Loading coil construction
22:22 Installation of the Antenna
23:13 Common Mode Current Choke
29:24 SWR Results
33:30 How many toroids should you use?
35:46 A Full Size 80m EFHW is actually a multiband antenna!
36:52 Adding 160m capability

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