Glenayre Electronics Inc. GL-T8600-CN Manual Do Utilizador
Glenayre Document Number: 9110.00172
DSP Exciter
Issue 1, Rev. I: 01/15/97
OPTIONS
Print Date: 02/19/97
Copyright © 1997 Glenayre
Page: 10-5
dsps
ec10
10.2 Exciter/PA Control with Standard Interface
The following major paragraphs describe the operation of the major items within the
standard interface. Detailed figures are referenced, as required.
standard interface. Detailed figures are referenced, as required.
The controller interface is the portion of exciter circuitry that connects the transmitter
controller to the exciter. The controller interface dictates what kind of transmitter controller
may operate the transmitter. The transmitter can be operated through one of several control-
lers depending on the interface circuitry installed at the exciter. The remainder of section
10.2 describes standard controller interface circuitry.
controller to the exciter. The controller interface dictates what kind of transmitter controller
may operate the transmitter. The transmitter can be operated through one of several control-
lers depending on the interface circuitry installed at the exciter. The remainder of section
10.2 describes standard controller interface circuitry.
Two boards form this interface, the internal standard interface board and the external
exciter standard interface I/O board.
exciter standard interface I/O board.
Control commands from the transmitter controller are connected through the interface
circuit. This circuit supplies remote control to the microcontroller unit (MCU) control
circuit. The VT-100 VDT supplies local control. The MCU control circuit generates all
control signals for the other circuits, and monitors their status. The MCU control circuit
reports status back to the VT-100 VDT and the interface circuit, which supplies the status
to the transmitter controller.
circuit. This circuit supplies remote control to the microcontroller unit (MCU) control
circuit. The VT-100 VDT supplies local control. The MCU control circuit generates all
control signals for the other circuits, and monitors their status. The MCU control circuit
reports status back to the VT-100 VDT and the interface circuit, which supplies the status
to the transmitter controller.
10.2.1 Reference Source
The ten-MHz reference signal is provided by the controller via J8 on the exciter/control
board. All other inputs and outputs, except for RF output, are routed through the standard
interface board.
board. All other inputs and outputs, except for RF output, are routed through the standard
interface board.
10.2.2 Controller Interface Connector Functions
, for a pin-by-pin descrip-
tion of signal functions. The controller interfaces with the transmitter through connector J4
and terminal board TB2 at the exciter back panel. TB2 also makes connections to optional
configurable alarm inputs and switching outputs.
and terminal board TB2 at the exciter back panel. TB2 also makes connections to optional
configurable alarm inputs and switching outputs.
10.2.3 Standard Interface Conversion Functions
Many of the signals exchanged between the controller and the exciter originate with a
format, voltage, or requirement incompatible with their destination. The standard interface
performs any signal conversions necessary to provide compatibility between the controller
and the exciter. The following text describes any signal conversions made by the controller
interface.
format, voltage, or requirement incompatible with their destination. The standard interface
performs any signal conversions necessary to provide compatibility between the controller
and the exciter. The following text describes any signal conversions made by the controller
interface.
10.2.3.1 Analog-Mode A/D Conversion
The exciter DSP modulator circuit reads synchronized serial data for its analog mode input
signal, but the transmitter controller provides an analog signal. The controller interface
converts the analog to the appropriate data form for the DSP. The analog (FLAT AUDIO
+,-) terminates across a balanced input circuit that also provides a level adjustment. The
adjustment, when properly set by the AUDIO INPUT ADJUST pot through the exciter
cover, provides analog to an A/D converter at the optimum zero-dBm level. The A/D
signal, but the transmitter controller provides an analog signal. The controller interface
converts the analog to the appropriate data form for the DSP. The analog (FLAT AUDIO
+,-) terminates across a balanced input circuit that also provides a level adjustment. The
adjustment, when properly set by the AUDIO INPUT ADJUST pot through the exciter
cover, provides analog to an A/D converter at the optimum zero-dBm level. The A/D