Specifications

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. 41 © 2003 SGC Inc
5.1.1 Tuning Process
An array of detector devices in the MAC-200 monitor the antenna
system impedance, reactance, and the VSWR when RF power is
applied. The coupler also monitors forward power, since the
control computer requires an indication of both forward and
reflected power in order to allow tuning to proceed. The forward
power detector is a check to ensure that the measurements made
are applied RF and are not spurious signals from the data
conversion system. The MAC-200 will tune only when enough
forward power is present to confirm this check. After RF is
applied to the detector system, it passes through the coupler-tuning
array. The coupler-tuning array consists of six capacitors in shunt
on the input arm of the network, seven inductors in the series arm,
and four more capacitors in shunt on the output arm, all arranged
in binary increments. Relays work with each lumped constant and
allow removal or entry as desired. A network having 64 values on
input shunt C, 16 values of output shunt C, and up to 128 values of
series L is possible with the manipulation of these 17 relays.