Hi Andrew. Also worth considering adding the little frequency compensation coil 2m from the feedpoint. This drops the resonant frequency on the higher bands to where you're likely to be operating...
Post update 10 October 2023 – I have changed the enamel wire to 18 AWG or 1 mm. The turns and impedance ratios remains as is. See this post.
In reply to vk2io. Impedance at 7 MHz is 5.5k
Worth measuring the choking impedance as this is the most important characteristic of a common mode choke. A good choke can achieve 8 kΩ - an average one only 1 kΩ. Cheers, Gerard - VK2IO
VK1AD – 10m half-wave coaxial dipole antenna
I love that center insulator. I’ve had good results with RG-174 (at reasonable lengths) over the years. 73, Craig WB3GCK
Brilliant results there, thanks for showing your log. However, I’m surprised with the use of 10m of RG174 as it is extremely lossy in my experience.
Nice! Great antenna for the field. 73, Craig WB3GCK
This has me excited to test it out on a summit (its safely stored in my pack). Have you seen a design for one of these for 28 mhz?
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