Richard Harrison wrote:

It is simple to calibrate a dynamometer for power and feed current
through one coil and place volts across the other. It senses volts and
amps but it reads out power,

Correct...

as does the Bird wattmeter.

Wrong. The Bird has no second meter coil, and no other physical
mechanism to multiply the E sample by the I sample.

As Walt says (thank you, sir) the Bird is *calibrated* in terms of power
using a matched load.

I've made my point. There's an Internet abbreviation called
IAFWAFIAWMWQ... so I'll be wise, and quit.


--
73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB)
Editor, 'The VHF/UHF DX Book'
http://www.ifwtech.co.uk/g3sek