Tom Donaly wrote:
The Bird sampling circuit certainly is a magical device if it can
allow one to "read" a power directly.

It would be a magical device if it did that but it doesn't.
The Bird wattmeter is simply an analog calculator. When the
Bird is *calculating* power, it phasor adds/subtracts a sample
voltage proportional to the total current to/from a sample volt
proportional to the total voltage and comes up with a superposed
voltage that is proportional to either forward power or reflected
power depending upon slug position.
--
73, Cecil http://www.qsl.net/w5dxp

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