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July 27th 03, 01:20 PM
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On Sat, 26 Jul 2003 21:20:18 -0700, Watson A.Name - 'Watt Sun'
wrote: In article , mentioned... Take a look at lowband filters and duplexers from CellWave, Telewave, etc. Your filter is going to be a coaxial cavity about 2mx20cm with piston for tuning. I am sure there are some better approaches to your task  How about a helical resonator. They're smaller than a cavity, maybe not as high Q, but still higher than lumped constant tuned circuit. They're tunable, but I'm not sure how much. I'd like to live long enough to see a helical at 40MHz that can 'attenuate the hell" out of signals outside the Fr+/-20kHz channel. |
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