Reg Edwards wrote:
THE METER TELLS YOU NOTHING ABOUT THE SWR ON THE TRANSMISSION LINE TO THE
ANTENNA.

Minimum 50 ohm SWR occurs at a current maximum point on my ladder-line.
Given that the current maximum point is purely resistive and knowing
the 50 ohm SWR allows me to calculate the only two possibilities for
the SWR on the ladder-line. Knowing the approximate feedpoint impedance
for my antenna and the exact length of the ladder-line allows me to
select which of the two SWRs is the valid one. In other words, knowing
the 50 ohm SWR allows me to estimate, with good accuracy, the SWR on
the ladder-line. These estimates agree closely with actual ladder-line
SWR measurements. Moral: In a previously characterized antenna system,
the SWR meter tells you virtually everything about the SWR on the
transmission line.
--
73, Cecil http://www.qsl.net/w5dxp



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