Bird Model 43 Wattmeter
22
y Turn on the RF source.
y Read the power using the scale whose full-scale marking matches
the element’s maximum power.
When readings are being made with the wattmeter connected to an
auxiliary RF line section, do not put an element in the unused line
section. Otherwise, the dc circuit will be unbalanced or shorted,
causing inaccurate or zero power readings.
For your convenience, a set of VSWR conversion nomographs is
included in this manual. With these charts, VSWR may be determined
from the forward and reflected power readings. Find the intersection
of the forward and reflected power measurements. The slanted line
passing closest to this point indicates the VSWR.
Figure 8
Element
Direction
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