Specifications

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5.1.4
Phase Detector
A phase detector consists of T3, A1, and their associated
components. This detector indicates the state of any reactance
associated with the antenna coupler as noted from the generator. A
line current sample is compared in phase with a voltage sample in
a double balanced mixer. Output polarity varies negative or
positive depending on the reactance of the antenna. The output of
the phase detector A1 is shifted to a 0 to 5v range, then fed to the
processor’s A to D converter port and used within the micro
controller.