"Cecil Moore" wrote

I mistakenly ran with the one foot answer but, wrong as it was,
proved that my two feet of RG-400 was long enough.

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Cecil, bearing in mind Lord Kelvin, can you say what the error in the
measured value of the SWR, or the reflection coefficient, would be if
the (sufficient) two feet of RG-400 was reduced to 1" inch.
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Reg.