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Theory of Operation
5
The electrical values of the element circuits are carefully
balanced and designed so that current from the reverse wave
will cancel the other almost completely. The result is
directivity always higher than 25 dB, which means that the
element is highly insensitive (nulled) to the REVERSE
direction wave. Being highly directional, the Thruline
element is sensitive (at one setting) only to one of the
travelling waves that produce standing waves by
interference. Thruline Wattmeter measurements are,
therefore, independent of position along standing waves.
Figure 4
Readings with
Various
Envelopes