Reg Edwards wrote:
Whereas the SWR meter requires at least a
1/4-wavelength of 50-ohm line before it stops being dishonest.

I asked that question over on sci.physics.electromag. A formula was
provided. Using the dimensions of RG-213, two feet is long enough
to establish the 50 ohm environment at 10 MHz.

SWR = [sqrt(Pfwd)+sqrt(Pref)]/[sqrt(Pfwd)-sqrt(Pref)]
--
73, Cecil http://www.qsl.net/w5dxp



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