Specifications

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5.1.8.2 Manual Mode
When the MAC-200 is operating in manual mode, antenna
selection is made from the front panel switches.
5.1.9 Tuning Paths
As mentioned previously, various tests are executed to determine
the most logical tuning sequence to be performed. Dependent on
the test results, additional tests and appropriate subroutines are
executed throughout the tuning process. Following are examples of
the activity that occurs when the coupler must be matched to a
frequency that requires a slightly longer or shorter antenna:
5.1.9.1 Antenna Too Short
Once the coupler has verified RF power, tuning sequence proceeds
as follows:
1. Series inductance is added until the phase is deemed
as being inductive.
2. At this point it is normal for the input impedance to
be low.
3. Input capacitance is added until the antenna is no
longer inductive.
4. The program will continue to increment the series
inductance in .125 µH steps—each time normalizing