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Open Wire fed lengths
On Jul 2, 8:08 am, John Smith wrote:
Cecil Moore wrote: Ron Walters wrote: Any recommended WEB sites or comments are welcomed. If your ground wire is an appreciable percentage of a wavelength, it is a radiating element grounded at one end, i.e. not a ground. An artificial ground might help to reduce RF in the shack. If your antenna is balanced, you don't need an RF ground. Cecil: Say I had a situation where I must use a ground wire which IS an appreciable percentage of a wavelength ... and don't wish it to radiate. Could I accomplish this by using coax as the ground-wire and choking the outer braid by sufficient windings on a toroid core, and grounding the center conductor and the braid to earth though good and deep grounding spikes or wires? Regards, JS The only way to keep a wire--e.g., piece of coax--from being a radiator is to keep net current at zero. If there's no net current, you didn't need the wire anyway (at that frequency, at least). If it's a protective ground for mains frequency, it will probably still work for that purpose if you add ferrite for RF choking. |
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