On Sat, 4 Sep 2004 14:08:53 +0000 (UTC), "Reg Edwards"
wrote:

NOTE: In the above description and calculation there is no mention of Zo,
terminating impedance, source impedance, reflection coefficient, forward
power, reflected power, reflected volts, reflected current, Smith charts, or
conjugate matches. All these things are superflous to the determination. No
information other than the two voltage measurements is needed.

Hi All,

No mention merely means there is no offer of accuracy (not very
important, eh what?). These two measurements (repeated at intervals)
can reveal a SWR that varies along the length of the line like a snake
- UNLESS of course, you DO observe unmentionables like Load reflection
co-efficients and Source reflection co-efficients. As such, a
description of how not to measure SWR, but rather how to exhibit error
if you perchance have the misfortune of having a transmitter that is
unmatched to a 50 Ohm transmission system whose load is in fact
mismatched also.

Need I point out that if both ends are matched - what's the point in
measuring SWR? ;-)

73's
Richard Clark, KB7QHC