Hi Mike! I think both systems would give you outstanding results! My current 160 antenna has lots of radials (120 per element (5) that are 1/4 wavelength (137 feet) long = 75,000 feet of wire (radial
An interesting tradeoff appears here. Bandwidth vs directivity. If you allow adjustable matching & phasing elements (or adjustable elements) you can get both really good F/B AND operating bandwidth.
Well, remotely adjustable elements would allow the optimizing of gain and f/b across the band for a parasitic array.... It is certainly doable even on 160, but is it necessary? On 160 I rarely go abo
There's an even easier way to control the length with air power. Rather than a knife switch, make the switch a plunger switch inside the tube. Imagine a tube with an air cylinder in the end, and the
days Sounds like one of those tilt-switches from a pinball machine. They used mercury to bridge two contacts. Trouble is, on a windy day, you might find you were changing bands when you didn't want t
You can do it very reliably. Not just a drop of liquid metal, you flood the area between the contacts. take a look at how they do "mercury contactors" used for quiet switching of big loads. You can d