Bird Technologies 4527 - Manual (Page 26)

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Figure 8 Element Direction
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 convenience, a set of VSWR conversion nomographs is included in this man-
ual. 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.