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April 3rd 04, 08:55 PM
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Dave wrote: I recently hooked up a thirty-six foot (plus or minus a couple of feet) piece of four-stranded wire with alligator clip to the internal "whip" antenna of my portable shortwave receiver, for the extra performance such a device offered. It works so well that I now cannot usually use my "DX" setting because of all the background noise (sounds like hundreds of other broadcasts vying for attention.) I don't know the frequency source of all this background noise, but would like to filter out as much of it as I can. One manufacturer of a similar "wind-up" antenna adds a capacitor to the wire in order to lower the resonance frequency of the wire. If I were going to try something similar (adding a capacitor, in series) in an attempt to bring the resonance of the wire down into the 30 MHz range, what size (roughly) capacitor should I use? Should I just try a few with different ranges, or does anyone here have any suggestions? What receiver? It sounds like it's being overloaded. |
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