Bird Model 43 Wattmeter
6
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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