High power—Brief description
NGT Transceiver System Technical Service Manual 223
HPAC and ALC adaptor modules with vendor equipment
The TW500 and TW1000 amplifiers are fixed-gain amplifiers with internal output filters
controlled through an external control port. The control functions are provided by the
HPAC module, and the power sensing required for ALC operation of the NGT is
provided by the ALC adaptor module.
HPAC
The High-power PA & Antenna Control PCB has a microprocessor for filter band
selection, and fault monitoring and reporting. It also includes an address switch to allow
correct operation for the various versions of the TW series amplifiers.
ALC adaptor
The High-power ALC Adaptor PCB has a forward and reflected power sensor to
generate ALC voltage to suit the NGT, based on forward peak and average powers, and
reflected power.
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