Reg Edwards wrote:
An SWR meter does NOT usefully indicate the vector sum of two voltages or
the vector difference between two voltages. I've never seen a meter with
such scales.

That's the way a Bird wattmeter works. The vector sum of two
voltages is the forward power on the scale. The vector difference
of those same two voltages is the reflected power on the scale.
One voltage is proportional to the net voltage. The other voltage
is proportional to the net current.

Even if it did, of what possible use would it be to anyone who is already
reliably informed his transmitter is loaded with 50 ohms.

In addition to my 50 ohm SWR meter, I have 450 ohm and 300 ohm
SWR meters, Reg. They indicate the forward/reflected powers and
SWR on the antenna side of the tuner which I find most helpful.
--
73, Cecil http://www.qsl.net/w5dxp



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