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#11
March 23rd 06, 11:36 AM
posted to rec.radio.amateur.antenna
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Current through coils
Cecil Moore wrote: wrote: The point I (and others) tried to make was that in a small inductor current was essentially equal at both ends of the coil, ... A 75m bugcatcher coil is NOT a small inductor. It is a slow- wave structure with a velocity factor of about 0.017, both measured and calculated. That gives my bugcatcher coil an electrical length at 4 MHz of about ~60 degrees. Let's focus on one thing at a time. You claim a bug cather coil has "an electrical length at 4MHz of ~60 degrees". That concept is easily proven false, just like the claim a short loaded antenna is "90-degree resonant". Both can be shown to be nonsense pictures of what is happening. Assume I have a 30 degree long antenna. If the loading inductor is 60 electrical degrees long, I could move it anyplace in that antenna and have a 90 degree long antenna. We all know that won't happen, so what is it you are really trying to say? 73 Tom |
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