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Bird Model 43 Wattmeter

Coupling Circuit

The coupling circuit that samples the travelling waves is in the Bird

Plug-In Element. The element circuitry and its relationship to the rest

of the Bird 43 are illustrated in Figure 3.

Current is produced in the coupling circuit by the travelling waves in

the line section. Both inductive and capacitive coupling contribute to

this. The inductive current flows in the direction of the travelling

wave. The capacitive current is independent of the direction of the

travelling wave. Therefore, the inductive current produced by one of

the travelling waves will add in phase with the corresponding

Figure 3

Thruline Wattmeter Schematic

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BIRD 43 Bedienerhandbuch Seite 16