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Jim Kelley wrote:
Cecil Moore wrote: I measured a ~25 nS delay in a 75m bugcatcher coil. What did you use to make that measurement? (I hope you don't say you used a Bird Wattmeter.) I've described it before. I used a dual-trace 100 MHz O-scope and estimated the phase angle between the two traces at about 7% of a cycle. That phase angle was certainly NOT ANYWHERE NEAR the 4.5 degrees reported by W8JI. W8JI measured a 4.5 degree phase shift in the standing-wave current being used for the measurement although virtually no phase information exists in the standing-wave current phase. W7EL made exactly the same mistake in his measurements. No wonder the two agree. -- 73, Cecil http://www.w5dxp.com |
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