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#4
June 17th 07, 06:21 PM
posted to rec.radio.amateur.homebrew
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About a narrow filter at 10.7 MHz
"Michael Black" wrote in message ... =?iso-8859-1?B?Rm9y52FDZWx0YQ==?= ) writes: Hello, It depends on what you need. Don't forget that the first single signal selectivity came to receivers in the thirties, via a single crystal filter. I'm suddenly blank about the name, but it was a balanced transformer feeding a crystal on one side and a trimmer capacitor on the other. You'd trim out the crystal holder's capacitance with the trimmer. Lamb? WAG. Pete |
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