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"Bob Myers" wrote in message news:M7Dcc.2397
"Dave" wrote in message 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? This isn't likely to help your basic problem, which appears to be a lack of selectivity in the radio (in other words, it is accepting signals over too wide a bandwidth, so you hear not only the station you're interested in, but those "to either side" as well. Having the passband too wide also makes for more noise in general. There are filters that can be added (within the receiver) to improve this, but your best bet may be to simply look for a better receiver. Not necessary at all. With a little studying of how antennas work, Dave could build an antenna tuner and preselector all rolled into one, with only a few parts. For specifics, that's a homework problem and I'm personally currently engaged in a project much like this; I'll post when I have something a little more concrete. Cheers! Rich |
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