Richard Harrison wrote:
You drive an automobile and glance at the speedometer. It is an
electrical meter giving an indication proportional to vehicle speed.

And if you think it is calibrated in km/hour when it is
actually calibrated in miles/hour, your speed reading will
be in error and you may get a ticket. This is akin to an
SWR meter being calibrated for the wrong Z0.
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73, Cecil http://www.qsl.net/w5dxp