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GV5/GV3.5 OPERATIONS & MAINTENANCE MANUAL DESCRIPTION
VERSION 0.2 2014-07-23 PAGE 3.1.3
Control/Monitor Stage
See electrical schematic Figure SD-2. The control/monitor stage performs many critical functions for the
transmitter. It:
 contains monitoring and protection circuits to prevent transmitter damage under adverse or
fault conditions, including high speed SWR protection and interlock/muting.
 monitors the current value of various parameters including cooling fan tachometer outputs,
transmitter output forward and reflected power, module temperature, PA current levels, and
PA power supply status signals.
 measures and monitors the output voltage from the power supply modules as well as the low
voltage power supplies.
 generates the signals that enable the power supply modules and control their output voltage.
 provides the status of any controller fault conditions.
 contains an integral DSP that performs all audio processing including filtering and FM
baseband modulation.
 interfaces with the RF and power supply sections of the transmitter to perform control and
monitoring functions.
 provides local and remote interfacing for the transmitter. Local interfacing is performed via
the local AUI touch screen on the front door of the transmitter and the controller module’s
front panel UI - a 4 x 20 graphic LCD display - and its adjacent keypad. The AUI and controller
UI each contain a menu-based series of pages that serve specific functions. The AUI is also
available via remote access. The AUI is a flash graphic that can be used on any web-based PC
or handheld device. The remote interface PWB (A16) allows the user a more convenient
method to interface with the transmitter from a remote location using discrete wiring.
The primary components of the control/monitor stage are the single-board computer (A4A1) and
controller PWB (A4A1), which are part of the controller module (A4) and the module control/interface
PWB (A3).
The UI interface PWB (A4A2), also part of the controller module, provides an interface between the
controller UI and the module control/interface PWB (A3). It also contains the pushbutton switches (
RF
ON , RF OFF and LOCAL/REMOTE ) and associated status LEDs that protrude through the front panel,
adjacent to the UI.
The remote interface PWB (A16) provides a convenient method to remotely control and monitor of the
transmitter. It contains push-button switches that provide backup control for the RF on/off, local/
remote, power increase/decrease and reset functions. It also contains LEDs that serve as an alternate
means to monitor status (local/remote and RF on/off) and various status and alarm parameters.