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#10
June 20th 06, 06:43 PM
posted to rec.radio.amateur.antenna
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Copper tubing capacitors
K7ITM wrote:
wrote: I guess I'm learning a public lesson but I'm going to post this as a wrapup. I figured out the problem. My inch of wire appears to measure about 0.06 microhenries. 1/(2*Pi*sqrt(0.06microhenries*165picofarads) ~ 50MHz 73, Dan N3OX Yeah, you discovered why they* suggest using an array of values of bypass capacitors, even when using SMT capacitors with "zero" lead length, to do a good job of bypassing a supply over a wide frequency range. And why even in ham construction literature from the 1950s they talk about keeping leads very short for good RF construction. . . . And just one of the many reasons I keep saying that good RF measurements are much more difficult to make than most people realize. Roy Lewallen, W7EL |
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