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I agree with Dale that you're not going to get anywhere near sharp
enough a filter by making something out of twinlead. Since the signals are coming from different directions, it might be more practical to make a null in the antenna pattern in the direction of the interfering signal. This is most likely to work if the desired station is reasonably strong, so it doesn't have to be in the direction of the antenna's maximum response. A two element phased array can be designed to achieve a deep and fairly narrow null, and you get a deep null off the end of a very symmetrical dipole or the side of a Yagi. If the directions are fairly close, an antenna with wider beam, like a 2-element phased cardiod pattern array or a dipole, would give you more of the desired signal when the undesired one is in the null, than a Yagi would. You might have to use some sort of feedline decoupling (common mode choke, also known as a "current" or "choke" balun) to prevent the feedline from being part of the antenna and reducing the depth of the pattern null. Roy Lewallen, W7EL |
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