Tag Archives: coil 40m

Adding a loading coil to a 40m Vertical for 80m operation

80m Loading CoilA successful morning today to convert my 40m vertical to an 80m vertical by adding a loading coil that I can switch out manually by just unplugging it. Nice and simple.

It’s not a great SWR curve due to the loading coil but I achieved 1.8:1 SWR at 3.79 Mhz, ideal for DX.

For the techies who want the dimensions: I wound 24 and a half turns on a fibreglass 2 and a quarter inch fibreglass former. The length of the coil itself is 3.5 inches.

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