AR 1000W1000G, Руководство по эксплуатации и обслуживанию, Страница: 52 / 70

Model 1000W1000G
32 Rev A
3.8 CONTROL SYSTEM
3.8.1 A25 ALC Board (Schematic 10023927)
This section describes the operation of the level control board. The level control board performs the
following functions:
•
Provides automatic level control of the amplifier’s output when the amplifier is placed in the ALC mode.
• Limits RF input level to the amplifier and turns on the audio alarm when forward or reflected power
levels exceed specified levels.
•
Drives forward and reflected indicators on the front panel display.
3.8.2 A26 Display Assembly, 4.3”, LCD (Schematics 10029679,
10030013)
The A12 Display Assembly board consists of two 16-bit microcontrollers and about nine other ICs that
monitor and indicate the status of the amplifier. Power is supplied using only a single 5-volt power supply.
The board offers the following:
Feature Quantity
Open drain outputs 4
Digital outputs 14 (8+6)
Digital inputs (5-volt tolerant) 24
Analog outputs 2
Mixed signal inputs 4
2-channel encoder input 1
Inputs for a keypad 6
Display connectors 1
Serial communication jacks 2