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A tune-up algorithm implements antenna matching. It is designed
using the MC68HC711E9 microprocessor that features a versatile
instruction set, RAM, and EEPROM (memory which is saved after
the coupler is turned off).
The antenna coupler relays are controlled by latches U6 and U7,
which receive serial data input directly from the CPU, and Q5.
During operation, data is transferred into the CPU from the A to D
ports and the Input Capture port (measures RF frequency).
The program monitors the status of the input sensors and—starting
from a preset condition—uses a built-in algorithm to achieve a
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