"Cecil Moore" wrote:
An SWR meter designed and calibrated for a Z0=50 standing-wave
environment may yield an irrelevant reading when operated outside
of a Z0=50 ohm standing-wave environment.
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Elaborating, an SWR meter will produce ~ accurate readings for an unknown
termination connected to it via a lossless transmission line of any length,
as long as that line has the same Zo as the sample section in the SWR meter.

It is only when the transmission line Zo varies from the Zo of the SWR meter
line section that accurate measurement of load SWR is problematic.

Selecting line lengths and line impedances to make an SWR meter and/or tx
"happy" when connected to an antenna doesn't necessarily mean that the all
components in the r-f output system have low SWR. The tx may be able to
deliver more power to the net load under those conditions, but SWR may still
exist on the transmission line capable of causing its failure.

RF