Ian White GM3SEK wrote:
The disagreement is entirely about the interpretation - in other words,
it's about the theory about standing and travelling waves. Richard
habitually misses out this step, which makes it look as if the Bird
wattmeter "proves" the physical existence of forward and reverse
travelling waves of power.

Those are traveling waves of *EM energy* where the power is indicated
at a point as the energy flows through that point. Assuming Z0=50 ohms,
the Bird indicates the number of joules per second flowing toward the
load when the slug is in the forward position. Turning the slug around
causes the Bird to indicate the number of joules per second flowing
toward the source.

The only way to have standing waves of EM energy in a transmission
line is to have two EM waves flowing in opposite directions. I have
asked you before to explain how standing waves develop without the
existence of a forward traveling wave and a rearward traveling wave.
Your silence on that subject has been conspicuous by its absence.
Do standing waves appear by magic?

It doesn't. Everything that you see printed on the Bird's meter scale,
and in the Bird literature, represents that company's particular
interpretation of theory about waves on transmission lines. The details
of that theory are *not* agreed within this newsgroup, which means that
- to some people - the two halves of Richard's claim do not join up.

Are you asserting that Bird is engaging in false advertising?
--
73, Cecil http://www.qsl.net/w5dxp