Glenayre Electronics Inc. GL-T8600-CN Manuel D’Utilisation
Glenayre Document Number: 9110.00172
DSP Exciter
Issue 1, Rev. I: 01/15/97
THEORY OF OPERATION
Print Date: 02/19/97
Copyright © 1997 Glenayre
Page: 6-1
sec_
6
6
THEORY OF OPERATION
6.1
Exciter/PA Control
Refer to
, which describes the
signal flow in the DSP exciter with the transmitter controller interface. The following major
paragraphs describe the operation of the major items within the figure. Additional detailed
figures are referenced, as required.
paragraphs describe the operation of the major items within the figure. Additional detailed
figures are referenced, as required.
6.1.1
Reference Source
The ten-MHz reference signal is provided by the transmitter controller or by an optional
internal reference oscillator. All other inputs and outputs, except for RF output, are routed
through the interface board.
internal reference oscillator. All other inputs and outputs, except for RF output, are routed
through the interface board.
6.1.2
Main Circuit Frequencies
The VCO/RF amplifier board installed determines the frequency for the RF output.
lists VCO/RF amplifier board frequen-
cies and the corresponding exciter/output frequencies.
6.1.3
Controller Interface Connector Functions
and subsequent tables for a pin-by-pin
description of signal functions. The exciter interfaces with the transmitter controller
through the exciter interface I/O board. Connector P4 on the internal interface board
connects directly to J4 on the exciter. Alarm signals, consisting of transmitter alarm, fault,
and status signals, are supplied directly to the transmitter controller.
through the exciter interface I/O board. Connector P4 on the internal interface board
connects directly to J4 on the exciter. Alarm signals, consisting of transmitter alarm, fault,
and status signals, are supplied directly to the transmitter controller.
Table 6-1 Exciter RF/Main Circuit Frequencies
exciter
output
frequency
(MHz)
output
frequency
(MHz)
first IF
frequency
(kHz)
frequency
(kHz)
second IF
frequency
(MHz)
frequency
(MHz)
VCO-1
frequency
(MHz)
frequency
(MHz)
VCO-2
frequency
(MHz)
frequency
(MHz)
900-960
100
90
89.9
810-870
445-470
100
90
89.9
355-380
275-330
100
90
89.9
365-420
130-180
100
90
89.9
220-270