Glenayre Electronics GL-T8200 Low Power Transmitter for 1 and 2way wireless data User Manual

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GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
Rev. A: 03/23/99
GL-T8200
1- to 25-Watt, 900-MHz Power Amplifier
USER MANUAL
PN 9110.01306
REV A
Specifications subject to change without notice
Copyright © 1999 Glenayre
All rights reserved. No part of this work may be reproduced or copied in any form or by
any means—graphic, electronic, or mechanical, including photocopying, recording,
taping, or information-retrieval system—without written permission of Glenayre.
Print Date: 03/23/99
Copyright © 1999 Glenayre
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
Document Change Record
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
Document Change Record
Revision:
Revision A
Date:
03/23/99
Changes:
none, original
Copyright © 1999 Glenayre
Print Date: 03/23/99
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
Table of Contents
Table of Contents
25w82001.toc
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.1
Manual Scope . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.2
Applicable Documents . . . . . . . . . . . . . . . . . . . . . 1-1
1.3
Manual Sections . . . . . . . . . . . . . . . . . . . . . . . 1-1
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1
3.2
4.2
Mounting Provisions . . . . . . . . . . . . . . . . . . . . . . . .3-1
3.1.2
PA Chassis Rear Connector Panel . . . . . . . . . . . . . . . . .3-1
Functional Description . . . . . . . . . . . . . . . . . . . . . 3-3
3.2.1
RF Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3
3.2.2
Signal and Power Connections . . . . . . . . . . . . . . . . . . .3-3
3.2.3
Isolator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
Cabinet Installation and External Cabling . . . . . . . . . . . . . 4-1
4.1.1
Tools and Equipment Required . . . . . . . . . . . . . . . . . . .4-1
4.1.2
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
4.1.3
Rack Positioning . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
4.1.4
External Cabinet Equipment Cabling . . . . . . . . . . . . . . . .4-1
4.1.5
PA I/O Connections . . . . . . . . . . . . . . . . . . . . . . . . .4-2
Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4.2.1
Expected Exciter . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
4.2.2
Setup Using VDT . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
5.1
Controls and Indicators . . . . . . . . . . . . . . . . . . . . 5-1
5.2
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
5.2.1
Turn PA On and Off . . . . . . . . . . . . . . . . . . . . . . . .5-1
5.2.2
Turn Fan On and Off . . . . . . . . . . . . . . . . . . . . . . . .5-1
5.2.3
Key and Unkey PA . . . . . . . . . . . . . . . . . . . . . . . . .5-1
THEORY OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
6.1
6.2
Print Date: 04/14/99
3.1.1
INSTALLATION AND SETUP . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.1
Physical Description. . . . . . . . . . . . . . . . . . . . . . 3-1
Power Distribution . . . . . . . . . . . . . . . . . . . . . . 6-1
6.1.1
Fan Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
6.1.2
High-Current Power to PA Board. . . . . . . . . . . . . . . . . .6-1
6.1.3
Metering Circuit Regulators . . . . . . . . . . . . . . . . . . . .6-1
RF Flow . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Copyright © 1999 Glenayre
Page: -i
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
Table of Contents
6.3
6.4
PA Board . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
6.3.1
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
6.3.2
Internally Generated Voltages . . . . . . . . . . . . . . . . . . 6-3
Exciter Interface . . . . . . . . . . . . . . . . . . . . . . . 6-5
6.4.1
6.5
Analog Readings Thresholds . . . . . . . . . . . . . . . . . . 6-5
6.5.1
PA Board Currents . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
6.5.2
PA Forward Power . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
6.5.3
PA Reflected Power . . . . . . . . . . . . . . . . . . . . . . . . 6-6
6.5.4
PA Board RF Input Power . . . . . . . . . . . . . . . . . . . . . 6-6
6.5.5
+28-Volt External Supply . . . . . . . . . . . . . . . . . . . . . 6-6
6.5.6
+36-Volt Internal Supply . . . . . . . . . . . . . . . . . . . . . . 6-6
6.5.7
+5-Volt Internal Supplies . . . . . . . . . . . . . . . . . . . . . . 6-7
6.5.8
Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
7.1
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
7.2
Power Calibration . . . . . . . . . . . . . . . . . . . . . . 7-1
CHECKOUT AND TROUBLESHOOTING . . . . . . . . . . . . . . . . . . 8-1
8.1
Introduction
8.2
Checkout Procedures . . . . . . . . . . . . . . . . . . . . . 8-1
. . . . . . . . . . . . . . . . . . . . . . . . 8-1
8.2.1
VDT Power-Up Verification . . . . . . . . . . . . . . . . . . . . 8-1
8.2.2
Dc Voltage Verification . . . . . . . . . . . . . . . . . . . . . . 8-1
Troubleshooting Procedures . . . . . . . . . . . . . . . . . . 8-1
8.3.1
Parameter Readings at Time of Fault. . . . . . . . . . . . . . . . 8-1
8.3.2
GL-C2000 Transmitter Controller Alarms . . . . . . . . . . . . . 8-2
8.3.3
Operational Checks . . . . . . . . . . . . . . . . . . . . . . . . . 8-2
8.3.4
Power Amplifier Current Measurement . . . . . . . . . . . . . . 8-2
REMOVAL AND REINSTALLATION . . . . . . . . . . . . . . . . . . . . 9-1
9.1
Page: -ii
Exciter Interface Connector Pinout . . . . . . . . . . . . . . . . . 6-5
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
8.3
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
PA . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
9.1.1
Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
9.1.2
Reinstallation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
Copyright © 1999 Glenayre
Print Date: 04/14/99
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
List of Figures
25w82001.lof
List of Figures
Figure 3-1
PA Front Isometric View . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Figure 3-2
Top View of PA RF Compartments, Showing Internal Assemblies . . . 3-3
Figure 4-1
PA Rear View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Figure 6-1
Simplified Power Amplifier Block Diagram . . . . . . . . . . . . . . . 6-2
Figure 6-2
PA Board Functional Diagram . . . . . . . . . . . . . . . . . . . . . . 6-4
Print Date: 04/14/99
Copyright © 1999 Glenayre
Page: -iii
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
List of Figures
Page: -iv
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
Copyright © 1999 Glenayre
Print Date: 04/14/99
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
List of Tables
25w82001.lot
List of Tables
Table 1-1
Applicable Documents . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Table 1-2
Manual Sections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Table 2-1
Power Amplifier Specifications. . . . . . . . . . . . . . . . . . . . . . 2-1
Table 4-1
Required Tools and Equipment . . . . . . . . . . . . . . . . . . . . . . 4-1
Table 4-2
PA I/O Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Table 4-3
Exciter/PA Connector Pinout (For DSP Exciter) . . . . . . . . . . . . . 4-3
Table 4-4
PA Board Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Table 6-1
PA Board Voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Table 6-2
Metered Parameter Thresholds . . . . . . . . . . . . . . . . . . . . . . 6-7
Table 8-1
PA Board Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2
Print Date: 04/14/99
Copyright © 1999 Glenayre
Page: -v
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
List of Tables
Page: -vi
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
Copyright © 1999 Glenayre
Print Date: 04/14/99
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
GENERAL
GENERAL
Manual Scope
25w82001
1.1
This manual provides information for the 1 to 25-watt, 900-MHz power amplifier, part
number 1000.02186.
1.2
Applicable Documents
This manual is incomplete without additional manuals. Refer to Table 1-1 for a listing and
function of these manuals.
Table 1-1 Applicable Documents
1.3
document
part number
function
GL-T8200 system manual
9110.01305
describes fully racked-up GLT8200 transmitter
DSP VDT manual
9110.00259
describes DSP exciter software installed in exciter
DSP exciter user manual
9110.01021
describes DSP exciter hardware
equipment in transmitter
GL-T8200 1 to 25-watt PA
manual
9110.01306
this manual
power supply manual
9110.00622
describes GL2728 power supply
equipment
Manual Sections
Table 1-2 lists the sections of this manual with a summary of their contents.
Print Date: 05/10/99
Copyright © 1999 Glenayre
Page: 1-1
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
GENERAL
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
Table 1-2 Manual Sections
Page: 1-2
section
contents
1. General
introduction and purpose of manual
2. Specifications
significant measurements of power amplifier
3. Description
introduction and principal characteristics of power
amplifier
4. Installation and Setup
initial installation and activation of power amplifier
5. Operation
operation of power amplifier
6. Theory of Operation
detailed functional description of circuitry within
power amplifier
7. Maintenance
procedures to be performed on specific intervals to
maintain optimum performance of power amplifier
8. Checkout and Troubleshooting
verification of proper operation, correction to proper
operation of power amplifier
9. Removal and Reinstallation
removal and reinstallation procedures for the PA
Copyright © 1999 Glenayre
Print Date: 05/10/99
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
SPECIFICATIONS
SPECIFICATIONS
25w82002
Table 2-1 lists the significant equipment-level specifications for the power amplifier.
Table 2-1 Power Amplifier Specifications
measurement
condition
specification
Electrical
RF output power (W)
continuous, at
output of PA
RF bandwidth (MHz)
1 to 25
exceeds exciter bandwidth
RF input power (mW)
factory-set
attenuation
RF input connector
200-400
type-N female
RF output connector
output of PA
input and output RF
impedance (ohms)
type-N female
50
VSWR
max
dc input power
voltage (Vdc)
current, idle/operating (A)
1.5
28
Mechanical and Environmental
Print Date: 03/29/99
humidity
5 to 95%, noncondensing
ambient storage temperature
-30o to 70oC
ambient operating
temperature
-30o to 60oC
temperature derating factor
above 5000 feet (1500 m)
0.5oC per 100 m
vibration
Mil-Std 810E, Method 514.4
Category 1
maximum operating
elevation
to 10,000 ft (3050 m)
height
3 RU (5.25 in, 13.4 cm)
width
19 in (48 cm)
depth
12 in (30.5 cm)
weight
25 lb (11.3 kg)
Copyright © 1999 Glenayre
Page: 2-1
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
SPECIFICATIONS
Page: 2-2
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
Copyright © 1999 Glenayre
Print Date: 03/29/99
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
DESCRIPTION
DESCRIPTION
25w82003
This is a 1- to 25-watt PA intended for use on the 900-MHz band. This PA is characterized
by integrated monitoring devices that supply critical status information to the DSP exciter.
This exciter contains diagnostic software that can detect and report a faulty PA.
3.1
Physical Description
Refer to Figure 3-1 and Figure 3-2. The PA consists of a 3 RU high chassis, including
convection fins and one fan.
The chassis contains a PA board which contains metering circuitry, power distribution
circuitry, and RF amplification circuitry.
3.1.1
Mounting Provisions
The PA is mounted to the front of most standard 19-inch equipment racks by means of eight
screws. The front panel of the PA may by removed while the PA is mounted in the rack for
access to fuses. Thumbscrews secure the front panel to the PA.
3.1.2
PA Chassis Rear Connector Panel
Refer to Figure 4-2 for a list of connections for the PA. The PA chassis rear connector panel
has an RF input connector, an RF output connector, a dc power input connector, a dc power
output connector, a fan, and a 15-pin connector for connection to the DSP exciter.
Print Date: 05/10/99
Copyright © 1999 Glenayre
Page: 3-1
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
DESCRIPTION
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
v0222.hgl
Figure 3-1 PA Front Isometric View
Page: 3-2
Copyright © 1999 Glenayre
Print Date: 05/10/99
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
DESCRIPTION
25w82003
v0221.hgl
Figure 3-2 Top View of PA Board, Showing I/O
3.2
Functional Description
The RF amplifier circuitry of the power amplifier is contained within the PA chassis. The
monitoring of the RF amplifier system is accomplished by the digital exciter through the
PA board located in the PA chassis.
3.2.1
RF Path
The PA chassis receives the exciter output at a rear-mounted type-N connector on the PA
board. The RF output power leaves the PA board through a type-N RF output connector. A
jumper delivers the signal to the lightning protector output on the cabinet.
3.2.2
Signal and Power Connections
All PA dc, signal monitoring, and control signals are routed through the PA board.
Print Date: 05/10/99
Copyright © 1999 Glenayre
Page: 3-3
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
DESCRIPTION
3.2.3
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
Isolator
intermodulation prevention
An isolator receives the RF output of the PA chassis. It prevents intermodulation of the RF
signal that may occur from nearby transmissions and reduces radiated harmonics. A sample
detector circuit in the isolator reject load input monitors the reflected power (VSWR)
present at the cabinet’s RF output connector. The VSWR RF sample is rectified and filtered,
providing a dc voltage proportional to the VSWR connector on the third isolator, which
voltage is supplied to the DSP exciter for transmitter control and monitoring. The VSWRdetection circuit of the third isolator is the only means of detecting whether there is an
antenna fault, which can then be detected and reported.
reject load
The triple isolator provides the power amplifier module with a stable 50-ohm load. This is
accomplished by directing any reflections from the output line to a reject load. Hence, the
load presented to the PA final transistor is always acceptable.
power control
An RF sample of the forward output signal is obtained from the forward-power coupler and
directed to the exciter, along with the reflected-power indication from the reflected-power
coupler. Control circuits within the DSP exciter evaluate the forward power and the
reflected power and control the output power according to conditions. Additionally, if the
DSP exciter detects an RF fault, it passes the report to the GL-C2000 and VDT for system
control.
Page: 3-4
Copyright © 1999 Glenayre
Print Date: 05/10/99
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
25w82004
4.1
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
INSTALLATION AND SETUP
INSTALLATION AND SETUP
Cabinet Installation and External Cabling
4.1.1
Tools and Equipment Required
Refer to Table 4-1. Equipment listed by brand name may be substituted with equivalent.
For installation, only common hand tools are necessary if at all, since equipment integration
is usually completed at the factory.
Table 4-1 Required Tools and Equipment
nut driver - 5/16 in (7.9 mm)
screwdriver - #2 flat blade and #3 flat blade
screwdriver - #2 Phillips and #3 Phillips
Bird 4421 RF power meter
Bird 8327 dummy load
spectrum analyzer
barrel connector - type-N female
cable - 1 M long (max) with 7/16 Din to type-N male ends
Fluke 77 DVM
7/16 DIN male-to-type-N female adapter
4.1.2
Inspection
Refer to the system manual.
4.1.3
Rack Positioning
Refer to the system manual also. Rackup variations are generally not possible. Cooling and
cabling restraints require that equipment pieces remain racked according to standard
configurations.
4.1.4
External Cabinet Equipment Cabling
The equipment items that comprise the paging transmitter are usually contained in one
cabinet. This section describes the various input and output connections required to bring
power and signals into and out of the cabinet.
Print Date: 05/11/99
Copyright © 1999 Glenayre
Page: 4-1
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
INSTALLATION AND SETUP
4.1.5
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
PA I/O Connections
Refer to Figure 4-1 and the appropriate rear views in the transmitter system manual. Most
connections are made to the rear of the PA chassis. Table 4-2 lists PA connections.
Table 4-2 PA I/O Connections
connector name
function
note
RF input
200 mW
type-N female
RF out
25 W
type-N female
TO EXCITER J6
control
See Table 4-3.
+TB1-1
positive 28-Vdc
input
Anderson power pole (+) red
GROUND TB1-2
power supply
negative return
Anderson power pole (-) black
auxiliary dc outputs
auxiliary power
See Table 4-4.
fan
supplies voltage to
PA fan
4.1.5.1
RF Output
Connect the antenna network to the lightning protector output. The connector is typically a
7/16-inch DIN mounted on top of the transmitter cabinet. It should be securely tightened to
a torque specification of 250 inch-pounds (2900 g-m).
4.1.5.2
The RF Output Forward and Reflected Dc Samples
The RF output forward and reflected dc sample from the isolator are digitized and routed
to the DSP exciter. High reflected power from either the antenna network or the output of
the PA causes reduced output and eventual shutdown.
4.1.5.3
Signal and Dc Connections
Be certain that the connection between the exciter and the rear of the PA chassis is secure.
Wiring details of the exciter/PA connector are shown in Table 4-3.
Page: 4-2
Copyright © 1999 Glenayre
Print Date: 05/11/99
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
INSTALLATION AND SETUP
25w82004
Table 4-3 Exciter/PA Connector Pinout (For DSP Exciter)
4.2
PA
J6-x
description
direction
PA
J6-x
description
direction
analog 1
to exciter
analog 2
to exciter
analog 3
to exciter
10
analog 4/aux. for
C.S.
to exciter
AGC reference
from
exciter
11
PA fault
to exciter
PA ground
12
PA ground
PA ground
13
mux select 1
from
exciter
mux select 2
from
exciter
14
mux select 3
from
exciter
key input
from
exciter
15
nc
reflected sample
(combiner)
to exciter
Setup
4.2.1
Expected Exciter
The PA chassis is interfaced to the exciter. The connection is:
• J6 to J6 for the DSP exciter.
4.2.2
Setup Using VDT
Setup of the PA is performed at the system level using a VDT. Refer to the VDT manual
and screens, which include instructions for these applicable setup procedures:
• adjust forward power
• set low-power alarm
Figure 3-2 shows controls, test points, and fuses on the PA board.
Print Date: 05/11/99
Copyright © 1999 Glenayre
Page: 4-3
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
INSTALLATION AND SETUP
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
Figure 4-1 PA Rear View
Page: 4-4
Copyright © 1999 Glenayre
Print Date: 05/11/99
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
INSTALLATION AND SETUP
Table 4-4 PA Board Fuses
PA board fuse
label
25w82004
F1 (3A)
Print Date: 05/11/99
connection
powers remaining circuitry of
PA board
F2 (5A)
R9000
J2-2
F3 (3A)
RX
J2-6
F4 (5A)
C2000
J2-8
F5 (3A)
DSP exciter
J2-4
F6 (3A)
powers transistor, first stage and
second stage of PA board
F7 (3A)
powers remaining circuitry of
PA board
Copyright © 1999 Glenayre
Page: 4-5
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
INSTALLATION AND SETUP
Page: 4-6
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
Copyright © 1999 Glenayre
Print Date: 05/11/99
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
25w82005
5.1
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
OPERATION
OPERATION
Controls and Indicators
The PA has no indicators nor controls which are suitable for user adjustment.
5.2
Operation
The transmitter normally operates within the paging system in an unattended manner. Local
control is not intended for operation, but for setup, checkout, or maintenance. Refer to the
appropriate section:
• Section 7, MAINTENANCE
• Section 8, CHECKOUT AND TROUBLESHOOTING
• Section 9, REMOVAL AND REINSTALLATION
Also refer to VDT manual.
5.2.1
Turn PA On and Off
Power is supplied to the transmitter and PA whenever the power supply is energized.
5.2.2
Turn Fan On and Off
The fan does not contain an on/off switch, but turns on and off with the power supply. The
fan is not equipped with a thermal switch, it runs continuously whenever the power supply
equipment is energized.
5.2.3
Key and Unkey PA
The PA does not contain a key switch, but is keyed and unkeyed by the presence of the RF
output signal from the exciter when it is keyed. The exciter is normally keyed and unkeyed
remotely through transmitter controller, but it can be keyed and unkeyed locally through a
video display terminal (VDT). Refer to the controller manual for remote key and unkey
instructions, or to the DSP exciter VDT manual for local key and unkey instructions.
Print Date: 05/10/99
Copyright © 1999 Glenayre
Page: 5-1
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
OPERATION
Page: 5-2
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
Copyright © 1999 Glenayre
Print Date: 05/10/99
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
6.1
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
THEORY OF OPERATION
THEORY OF OPERATION
Power Distribution
25w82006
The PA requires a primary 28-volt dc power input, which is typically provided by the ac
power supply.
6.1.1
Fan Power
Fan power is received directly from the fan plug.
6.1.2
High-Current Power to PA Board
Positive dc operating power is received through the Anderson power poles. The positive
side of the 28-volt supply enters through TB1-1 on the PA board. Power to the board is
distributed through fuses. Refer to Table 4-4.
6.1.3
Metering Circuit Regulators
The PA board has three on-board regulators which supply power to several circuits on the
PA board. Refer to Table 6-1 for the PA board voltages, test points, and functions.
Table 6-1 PA Board Voltages
6.2
function (PA board unless
specified otherwise)
voltage (Vdc)
test point
+36
J1-6
supply voltage for currentsensing op-amps
+28
TB1-1
PA board +28-Vdc supply
+5VREF
J1-4
reference for measuring op-amps
+5
J1-3
supply voltage for metering and
control circuits
ground
TB1-2
ground
RF Flow
Refer to Figure 6-1. The PA board receives its RF input through a type-N connector, via the
PA chassis. A coupler reduces the RF input to an acceptable level. The RF input is amplified
by means of two amplifier stages. A detector circuit in the input to the PA board monitors
the RF input. The PA output is connected to the output type-N connector of the PA chassis.
Print Date: 05/10/99
Copyright © 1999 Glenayre
Page: 6-1
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
THEORY OF OPERATION
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
Figure 6-1 Simplified Power Amplifier Block Diagram
6.3
PA Board
The DSP exciter monitors currents, voltages, powers, and other valuable status information
from the power amplifier through the PA board. The two main functions of the PA board
are to channel information from the PA chassis to the exciter and to distribute dc power to
the exciter, R9000, receiver and C2000.
Most of the information passed to the exciter is in the form of voltages that represent
powers, currents, supply voltages and temperature. This information is multiplexed in the
PA board onto two analog lines that feed the exciter’s analog-to-digital converter (ADC).
The PA board also detects overcurrent and high reflected power conditions in the PA. Once
this condition is detected, the PA board pulls a PA fault line high initiating an interrupt in
the exciter. This interrupt causes the exciter to reduce power or shut the transmitter down
to protect it from damage.
Page: 6-2
Copyright © 1999 Glenayre
Print Date: 05/10/99
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
25w82006
6.3.1
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
THEORY OF OPERATION
Input Voltage
dc power input
Refer to Figure 6-2. The +28-volt supply voltage from the main power supply feeds the
distribution circuitry on the PA board through an Anderson power pole. The negative side
of the supply is grounded to the black (-) connection. The positive side of the supply goes
to the red (+) connection and on to the distribution circuitry on the PA board.
fuses
The +28-volt supply is distributed throughout the PA board through current monitoring
circuits and fuses. The +28-volt supply voltage is also used in the metering circuitry. Refer
to fuse information in Table 4-4.
internal voltages
The internal supply voltages described in Paragraph 6.3.2 are derived from the main
supply line. Refer to Table 6-1 for more information concerning the PA board regulators,
voltages, and test points.
6.3.2
Internally Generated Voltages
6.3.2.1
+36-Volt Internal Supply
The +36-volt supply is derived with a voltage doubling circuit. This supply has a very low
current since it only drives the current monitoring op-amps in the PA board. These op-amps
monitor the current of transistors Q1 and Q2 from the high side of the 28-volt supply, and
therefore require a supply higher voltage. The +36-volt supply can be monitored at J1-6
with reference to ground
6.3.2.2
+5-Volt Precision Reference Internal Supply
The +5-volt reference supply also supplies very little current and is used for fault detections, where the trip point is critical. The +5-volt reference supply can be monitored at J14 with reference to ground.
6.3.2.3
+5-Volt Internal Supply
The +5-volt supply has to supply approximately 1 ampere at 5 volts to portions of the PA
board. Filtering is required to keep RF from getting onto the PA board circuitry. The +5volt supply can be monitored at J1-3 with reference to ground.
6.3.2.4
+28-Volt Supply
The +28-volt supply is monitored by the multiplexer 0 on the PA board. The +28-volt
supply can be monitored at TB1-1.
Print Date: 05/10/99
Copyright © 1999 Glenayre
Page: 6-3
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
THEORY OF OPERATION
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
sheet1.plt
Figure 6-2 PA Board Functional Diagram
Page: 6-4
Copyright © 1999 Glenayre
Print Date: 05/10/99
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
THEORY OF OPERATION
25w82006
sheet2.plt
Figure 6-2, PA Board Functional Diagram (continued)
Print Date: 05/10/99
Copyright © 1999 Glenayre
Page: 6-5
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
THEORY OF OPERATION
6.4
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
Exciter Interface
The physical interface is a 15-pin, filtered male connector on the exciter and the PA chassis.
15-pin connector J6 is mounted on the PA board.
More information concerning the DSP exciter interface connector pinout is given in
Paragraph 6.4.1. For information on setting the PA to expect the standard DSP exciter,
refer to Paragraph 4.2.1.
6.4.1
Exciter Interface Connector Pinout
Refer to Table 4-3. The interface connector pin numbers refer to the 15-pin exciter/PA
interface connector on the rear of the PA chassis and the DSP exciter.
6.4.1.1
Analog 1 Output
Pins 1 (+) of the D-sub 15-pin interface connector is the analog 1 output from multiplexer
0 on the PA board. The output voltage range is 0-5 volts for the + pin, the - pin is referenced
to PA ground. The analog value on the multiplexer output may be one of eight different
channels and is selected by the microcontroller through the multiplexor select lines 0-2.
6.4.1.2
Analog 3 Output
Pins 2 (+) of the D-sub 15-pin interface connector is the analog 3 output which goes to J62 and is used for customer specials. The output voltage range is 0-5 volts for the (+) pin,
the (-) pin is referenced to PA ground. This analog output operation is the same as the
analog 0 output described above.
6.4.1.3
Mux Select Lines 0-2
Pins 13, 6, and 14 of the D-sub 15-pin interface connector are multiplex lines 0 through 2,
respectively. These input lines from the exciter are digital in nature and are used to select
the appropriate channel of the analog multiplexers on the PA board.
6.4.1.4
PA Fault Interrupt
Pin 11 of the D-sub 15-pin interface connector is the chassis fault-interrupt output line. This
output goes from LO to HI to indicate that a high VSWR or high-current condition has
occurred in the PA. This output is digital in nature and drives an interrupt input to the microcontroller in the exciter. This output from the PA board is ORed with the other PA board
fault outputs; therefore only one line has to be active to indicate a fault.
6.5
Analog Readings Thresholds
Refer to Table 6-2.
Page: 6-6
Copyright © 1999 Glenayre
Print Date: 05/10/99
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
25w82006
6.5.1
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
THEORY OF OPERATION
PA Board Currents
The currents monitored in the PA board have various upper limits, as shown in Table 6-2.
They are read on the VDT screen. When one or more of these thresholds is met, it causes
an interrupt to the microcontroller in the exciter, which then reduces output power until the
fault condition no longer exists or until shutdown occurs. As of this printing, no lower
current limit has been programmed.
6.5.2
PA Forward Power
The PA board forward and reflected samples are digitized and sent out the I20 interface.
The forward power reading from the PA board has a lower limit which is determined by the
forward power setting of the transmitter. This limit is based on efficiency and losses in the
PA. The lower limit is 1 watt. The upper limit for the forward power reading is 25 watts.
This does not cause an interrupt to the exciter, but if a reading exceeds this level, the exciter
shuts the transmitter down.
6.5.3
PA Reflected Power
The reflected power reading in the PA has a lower limit of 0 W, and an upper limit of 5 W
average power. When this limit is achieved, it initiates an interrupt to the microcontroller
in the exciter which reduces power until the fault goes away or until a shutdown condition
occurs.
6.5.4
PA Board RF Input Power
The input power to the PA has a lower limit of 200 mW. If the threshold is not reached, the
PA shuts down.
6.5.5
+28-Volt External Supply
The upper limit of the PA’s 28 volt supply is +29 volts, and the lower limit is +22 volts.
Excursions outside these limits are a fault state. The transmitter shuts down.
6.5.6
+36-Volt Internal Supply
The +36 volt supply to the current metering op-amps has a window of +33 volts and +39
volts. When these limits have been exceeded, it results in an alarm condition only, no power
reduction.
Print Date: 05/10/99
Copyright © 1999 Glenayre
Page: 6-7
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
THEORY OF OPERATION
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
Table 6-2 Metered Parameter Thresholds
6.5.7
upper
threshold
lower
threshold
analog reading
PA
PA
total forward power (W)
25
total reflected power (W)
PA current Q1
1.6
none
PA current Q2
3.3
none
+36 Vdc
39
33
+28 Vdc
29
22
+5 Vdc
5.5
4.5
temperature
80o (alarm)
85o (fault)
-30o
+5-Volt Internal Supplies
Both of the +5-volt supplies in the PA have an alarm window of +5.5 and +4.5 volts.
Exceeding either parameter results in an alarm condition only.
6.5.8
Temperature
The ambient temperature in the PA has an upper limit of +85 C. If this limit is exceeded,
the transmitter shuts down.
Page: 6-8
Copyright © 1999 Glenayre
Print Date: 05/10/99
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
MAINTENANCE
MAINTENANCE
25w82007
If the PA becomes faulty, get a replacement from Glenayre customer service.
7.1
Cleaning
The PA chassis should be kept clean and free of dust. Dust and dirt can reduce the cooling
efficiency of the PA which can lead to module failure. Dirt on the printed circuit boards can
also lead to other types of failures. Most dust and dirt can be removed with a vacuum
cleaner. Do not use air pressure to blow dust and dirt from the module, because it allows
dust to resettle on other equipment which may have already been cleaned.
7.2
Power Calibration
The complete power calibration was done with precise measuring equipment at the factory;
the accuracy exceeds that of field-quality test equipment. Refer to the DSP exciter user
manual for details. The transmitter is adjusted to the desired power via the video display
terminal.
Print Date: 03/26/99
Copyright © 1999 Glenayre
Page: 7-1
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
MAINTENANCE
Page: 7-2
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
Copyright © 1999 Glenayre
Print Date: 03/26/99
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
8.1
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
CHECKOUT AND TROUBLESHOOTING
CHECKOUT AND TROUBLESHOOTING
Introduction
25w82008
Checkout procedures can be performed at any time to verify that the power amplifier (and
transmitter) is functioning properly. After the checkout procedures are successfully
completed, the site can be returned to normal service. Pursue any troubleshooting
procedure provided or referenced, which is a direct result of a failed checkout procedure
before trying to complete the checkout procedure.
The following procedures presume that the installation and setup procedures in section 4 of
this manual have already been successfully completed. Refer to the DSP exciter VDT user
manual for more checkout procedures.
8.2
Checkout Procedures
8.2.1
VDT Power-Up Verification
Once powered, verify that the VDT is powered. Check list below:
• the VDT should have a cursor displayed and blinking
• or the VDT should have an instructional prompt displayed
• or the VDT should have an auto-loaded program running.
8.2.2
Dc Voltage Verification
Once powered, verify that the fan is operating. The fan is located on the rear of the PA. Also
insure that air flow is not obstructed inside or outside of the transmitter cabinet, around the
cabinet vents, and in the heat sink cooling fins of the PA.
8.3
Troubleshooting Procedures
Connect the VDT to the VT-100 connector on the front panel of the DSP exciter. Check the
power amplifier parameters using the VDT, refer to the DSP exciter VDT user manual for
assistance in using the VDT menus for troubleshooting.
8.3.1
Parameter Readings at Time of Fault
When the DSP exciter receives a fault indication from the transmitter or exciter, it records
all of the transmitter parameters at that instant. This is a valuable source of PA troubleshooting data and should always be checked when transmitter problems occur. Connect the
VDT to the VT-100 connector on the front panel of the exciter to access the transmitter fault
information. Refer to the DSP exciter VDT user manual for assistance in reading the transmitter faults. Check the transmitter fault parameters against the normal transmitter
operating parameters. The normal transmitter operating parameters can be obtained from
the factory transmitter test data sheets; or (if available) from the transmitter parameters log
mentioned in sections 4 and 7 of this manual.
Print Date: 05/10/99
Copyright © 1999 Glenayre
Page: 8-1
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
CHECKOUT AND TROUBLESHOOTING
8.3.2
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
GL-C2000 Transmitter Controller Alarms
Another valuable source of PA troubleshooting data is the GL-C2000 alarm history. It is
accessed by connecting the VDT to the VT-100 connector on the front panel of the GLC2000 transmitter controller. Consult the GL-C2000 user manual for assistance in
accessing the controller alarm history.
If the GL-C2000 has a telephone line connected to its modem output, its alarm history can
be accessed remotely through the use of the Glenayre GL-N2000 console, or with a
computer which is running a communication program with VT-100 emulation and has a
2400-baud modem.
The GL-N2000 console equipped with version 3.5 or later software can also perform an
over-the-air connection if telephone lines are not connected to the GL-C2000 controller.
8.3.3
Operational Checks
If the transmitter is operational, valuable troubleshooting information can be obtained by
comparing the present transmitter operating parameters, obtained through the exciter VDT
connection, to the parameters from the factory transmitter data sheets; or (if available) from
the transmitter parameters log.
8.3.4
Power Amplifier Current Measurement
Refer to Table 8-1, PA Board Current. The PA board has provisions to measure the current
flow of the first and second stage.
Table 8-1 PA Board Current
Page: 8-2
PA board function
transistor current measured
first stage
measure Q1 current
second stage
measures Q2 current
Copyright © 1999 Glenayre
Print Date: 05/10/99
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
REMOVAL AND REINSTALLATION
REMOVAL AND REINSTALLATION
25w82009
Caution
When fastening dc connectors, be certain that the
plug is centered directly on its corresponding jack
and that the polarity is correct. Do not make dc
connections while power is applied to the chassis.
The PA is secured to the rails by eight screws.
9.1
PA
9.1.1
Removal
Note
Before removing the PA as a result of fault isolation, be certain that the
fault is with it. The exciter and interconnecting wiring are essential to
proper operation of the power amplifier.
9.1.2
1.
Loosen the eight screws on the front of the PA.
2.
Disconnect I20, dc power in, dc power out, RF in, and RF out from the back of the
PA.
3.
Pull PA out of rack until it is completely out.
Reinstallation
1.
Place PA into location in rack.
2.
Put in eight screws and lightly fasten.
3.
Attach I20, dc power in, dc power out, RF in and RF out to the back of the PA.
4.
Tighten screws.
This procedure is complete. Check out the transmitter to see that it functions properly.
Print Date: 03/26/99
Copyright © 1999 Glenayre
Page: 9-1
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
REMOVAL AND REINSTALLATION
Page: 9-2
Glenayre Document Number: 9110.01306
Rev. A: 03/23/99
Copyright © 1999 Glenayre
Print Date: 03/26/99
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
Rev. A: 03/24/99
GL-T8200
1- to 25-Watt 900-MHz Transmitter System
USER MANUAL
PN 9110.01305
REV A
Specifications subject to change without notice
Copyright © 1999 Glenayre
All rights reserved. No part of this work may be reproduced or copied in any form or by
any means—graphic, electronic, or mechanical, including photocopying, recording,
taping, or information-retrieval system—without written permission of Glenayre.
Print Date: 03/24/99
Copyright © 1999 Glenayre
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
Document Change Record
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
Document Change Record
Revision:
Date:
03/24/99
Changes:
none; original
Copyright © 1999 Glenayre
Print Date: 03/24/99
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
Table of Contents
Table of Contents
8200sys1.toc
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.1
Manual Scope . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.2
Applicable Documents . . . . . . . . . . . . . . . . . . . . . 1-1
1.3
Manual Sections . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.4
About Glenayre . . . . . . . . . . . . . . . . . . . . . . . 1-2
1.5
1.4.1
Product Warranty Information . . . . . . . . . . . . . . . . . . .1-3
1.4.2
Service Warranty Information . . . . . . . . . . . . . . . . . . .1-3
Regulatory-Authority Compliance . . . . . . . . . . . . . . . . 1-3
1.5.1
FCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
1.5.2
Industry Canada . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
1.5.3
Other . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
+DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1
3.2
3.3
3.1.1
Mounting Provisions . . . . . . . . . . . . . . . . . . . . . . . .3-1
3.1.2
Exciter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
3.1.3
Power Amplifier (PA). . . . . . . . . . . . . . . . . . . . . . . .3-2
3.1.4
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
3.1.5
Video Display Terminal (VDT). . . . . . . . . . . . . . . . . . .3-2
Simplified Paging-Site Functional Description . . . . . . . . . . . 3-2
3.2.1
Paging Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
3.2.2
Link Equipment and Transmitter Controller . . . . . . . . . . . .3-2
3.2.3
Paging Transmitter . . . . . . . . . . . . . . . . . . . . . . . . .3-4
3.2.4
Video Display Terminal. . . . . . . . . . . . . . . . . . . . . . .3-4
3.2.5
Ac Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
Site Signal Flows . . . . . . . . . . . . . . . . . . . . . . . 3-4
3.3.1
Site RF-Signal Flow. . . . . . . . . . . . . . . . . . . . . . . . .3-4
3.3.2
Site Audio/Modulation-Signal Flow . . . . . . . . . . . . . . . .3-5
3.3.3
Simplified Block-Diagram Description . . . . . . . . . . . . . . .3-6
3.3.4
Site Control-Signal Flow . . . . . . . . . . . . . . . . . . . . . .3-7
3.3.5
Status-Signal Flow . . . . . . . . . . . . . . . . . . . . . . . . .3-7
INSTALLATION AND SETUP . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.1
Print Date: 04/14/99
Physical Description. . . . . . . . . . . . . . . . . . . . . . 3-1
Site Checks . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.1.1
Transmitter Environment . . . . . . . . . . . . . . . . . . . . . .4-1
4.1.2
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Copyright © 1999 Glenayre
Page: -i
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
Table of Contents
4.1.3
4.2
4.2.1
Tools and Equipment Required. . . . . . . . . . . . . . . . . . . 4-2
4.2.2
Rack Positioning . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.2.3
Rack Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.2.4
Positioning within the Rack . . . . . . . . . . . . . . . . . . . . 4-3
4.2.5
Equipment Cabling . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4.4
Ultimate Disposition . . . . . . . . . . . . . . . . . . . . .
4-4
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
5.1
Controls and Indicators . . . . . . . . . . . . . . . . . . . . 5-1
5.2
Operation . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
5.2.1
Turn Transmitter On and Off . . . . . . . . . . . . . . . . . . . . 5-1
5.2.2
Turn Fans On and Off . . . . . . . . . . . . . . . . . . . . . . . 5-1
5.2.3
Key and Unkey PA . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
THEORY OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Cabinet Power Distribution . . . . . . . . . . . . . . . . . . 6-1
6.1.1
Ac Power Input . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
6.1.2
Dc Power Distribution . . . . . . . . . . . . . . . . . . . . . . . 6-1
Cabinet Signal Distribution . . . . . . . . . . . . . . . . . . 6-1
6.2.1
Control, Data, and Modulation Paths . . . . . . . . . . . . . . . . 6-1
6.2.2
Alarm Reporting . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
7.1
Introduction
7.2
Maintenance Procedures. . . . . . . . . . . . . . . . . . . . 7-1
. . . . . . . . . . . . . . . . . . . . . . . . 7-1
7.2.1
PA Current Check . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
7.2.2
Dc Ripple Check . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
CHECKOUT AND TROUBLESHOOTING . . . . . . . . . . . . . . . . . . 8-1
8.1
8.2
8.3
Page: -ii
Installation . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
6.2
Primary Power Requirement . . . . . . . . . . . . . . . . . . . . 4-1
4.3
6.1
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
Preparation for Checkout Procedures . . . . . . . . . . . . . . . 8-1
8.1.1
Dc-Voltage Verification . . . . . . . . . . . . . . . . . . . . . . 8-1
8.1.2
VDT Power-up Verification . . . . . . . . . . . . . . . . . . . . 8-1
8.1.3
Cooling-Fan Check . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Operational Verification . . . . . . . . . . . . . . . . . . . . 8-1
8.2.1
RF Power and Antenna . . . . . . . . . . . . . . . . . . . . . . . 8-2
8.2.2
Paging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2
Field Replacement of Assemblies . . . . . . . . . . . . . . . . 8-2
Copyright © 1999 Glenayre
Print Date: 04/14/99
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
REMOVAL AND REINSTALLATION. . . . . . . . . . . . . . . . . . . . . 9-1
9.1
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . 9-1
9.2
Exciter Removal and Reinstallation. . . . . . . . . . . . . . . . 9-1
9.3
PA Removal and Reinstallation . . . . . . . . . . . . . . . . . 9-2
8200sys1.toc
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
Table of Contents
Print Date: 04/14/99
Copyright © 1999 Glenayre
Page: -iii
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
Table of Contents
Page: -iv
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
Copyright © 1999 Glenayre
Print Date: 04/14/99
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
List of Figures
List of Figures
Transmitter Front View . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Figure 3-2
Transmitter Simplified Block Diagram . . . . . . . . . . . . . . . . . . 3-6
Figure 4-1
Rear View Showing Dc and Signal Connections . . . . . . . . . . . . . 4-5
8200sys1.lof
Figure 3-1
Print Date: 04/14/99
Copyright © 1999 Glenayre
Page: -v
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
List of Figures
Page: -vi
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
Copyright © 1999 Glenayre
Print Date: 04/14/99
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
List of Tables
8200sys1.lot
List of Tables
Table 1-1
Applicable Documents . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Table 1-2
Manual Sections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Table 2-1
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Table 3-1
Site Equipment List . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Table 4-1
Required Tools and Equipment . . . . . . . . . . . . . . . . . . . . . . 4-2
Print Date: 04/14/99
Copyright © 1999 Glenayre
Page: -vii
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
List of Tables
Page: -viii
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
Copyright © 1999 Glenayre
Print Date: 04/14/99
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
1.1
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
GENERAL
GENERAL
Manual Scope
8200sys1
This manual provides information for the following transmitter:
• 1 to 25-watt, 900-MHz transmitter, model GL-T8200.
1.2
Applicable Documents
This manual is incomplete without additional manuals. Refer to Table 1-1 for a list of
applicable documents, their part numbers, and a brief description of each.
Table 1-1 Applicable Documents
1.3
document
part number
description
9100.XXXXX
9100.XXXXX
assembled GL-T8200 manual. Requestors
should ask for option manuals which match
their configuration.
GL-T8200 system manu- 9110.001305
al
this document
DSP VDT manual
9110.00259
describes DSP exciter software installed in
exciter
DSP exciter User Manual 9110.01021
describes DSP exciter hardware equipment
in transmitter
GL-C2000 User Manual
describes GL-C2000 controller hardware
and software
9110.01248
GL-T8200 power ampli- 9110.001306
fier manual
describes 1 to 25 watt, 900-MHz power
amplifier
power supply manual
describes GL2728 power supply equipment
9110.00622
Manual Sections
Refer to Table 1-2. This table lists the sections in this manual, and provides a brief description of the content of each section.
Print Date: 05/10/99
Copyright © 1999 Glenayre
Page: 1-1
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
GENERAL
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
Table 1-2 Manual Sections
section
contents
1. General
introduction and purpose of manual
2. Specifications
significant system measurements; also see individual equipment manuals
3. Description
introduction and principle characteristics of the equipment
4. Installation & Setup
initial installation and activation of the equipment
5. Operation
operation of equipment
6. Theory of Operation
detailed functional description of transmitter
7. Maintenance
procedures to be performed on specific intervals to maintain
optimum performance of the equipment
8. Checkout and Trouble- verification of proper operation, correction to proper operashooting
tion
9. Removal and Reinstal- replacement procedures for assemblies which do not have
lation
their own, separate equipment manuals
1.4
About Glenayre
Questions regarding the equipment or this manual should be directed to:
U.S.A.
Glenayre Customer Service - RF
One Glenayre Way
Quincy, Illinois 62305-3726
Phone: (217) 223-3211
Fax: (217) 221-6259
CANADA
Glenayre Customer Service - RF
1450 Kootenay Street
Vancouver, B.C.V5K 4R1
Phone: (604) 293-1611
Fax: (604) 293-4301
UNITED KINGDOM
SINGAPORE
Glenayre Electronics (UK) Ltd.
Glenayre Electronics Pte Ltd.
Unit 22, Challenge House
No. 8 Ang Mo Kio
Sherwood Drive
Industrial Park 2
Bletchley, Milton Keynes, MK3 6JD 569500 Singapore
Phone: 44 (1908) 484800
Phone: 65 483-8787
Fax: 44 1908 484801
Fax: 65 483-9663
For additional Glenayre contacts, refer to
www.glenayre.com/corporate/contacts/default.asp .
Page: 1-2
Copyright © 1999 Glenayre
Print Date: 05/10/99
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
1.4.1
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
GENERAL
Product Warranty Information
8200sys1
Glenayre warrants to the original purchaser that Glenayre products are free from defects in
material and workmanship for a period of twenty-four months from the original invoice
date, subject to the provisions herein. Glenayre will repair or replace at its option, FOB our
factory, free of charge within one year from the date of shipment, any component, assembly
or subassembly of our manufacture found to be defective under conditions of normal use.
The unit, if repaired, will be returned to its original specifications. Failures caused by unauthorized modifications, force majeure, lightning, physical, environmental, or electrical
damage including use with incompatible equipment are specifically excluded from this
warranty. Glenayre disclaims any and all liability for loss or other damage whether direct,
consequential or of any nature whatsoever, resulting from product failure.
This warranty is in lieu of all other warranties expressed or implied and covers only those
items manufactured by Glenayre. Equipment supplied by, but not manufactured by
Glenayre, is subject only to any warranty offered by the manufacturer of said equipment.
1.4.2
Service Warranty Information
Return of a defective item must be authorized by Glenayre prior to shipment. A Return
Authorization number can be obtained from Glenayre Customer Service. When requesting
a Return Authorization number, give the serial number of the unit. A description of the fault
should accompany the unit on its return and the RA number must be shown on labels
attached to the item(s). The cost of shipping to Glenayre is to be paid by the customer.
Shipping from Glenayre will be prepaid by the customer, and shipped via surface mail. If
express shipping is required, the unit will be shipped collect.
Any repair service performed by Glenayre under this limited warranty is warranted to be
free from defects in material or workmanship for ninety days from the date of repair. All
other terms of this limited warranty apply to the service warranty.
1.5
Regulatory-Authority Compliance
1.5.1
FCC
Refer to Table 2-1 for authorizations.
1.5.2
Industry Canada
Refer to Table 2-1 for authorizations.
1.5.3
Other
Refer to Table 2-1 for authorizations. Type approvals have been applied for in all major
markets. Refer to Paragraph for more information.
Print Date: 05/10/99
Copyright © 1999 Glenayre
Page: 1-3
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
GENERAL
Page: 1-4
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
Copyright © 1999 Glenayre
Print Date: 05/10/99
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
SPECIFICATIONS
SPECIFICATIONS
8200sys2
Table 2-1 contains transmitter and power supply specifications. The ac power supply is a
purchased item. Refer to the power supply manual, PN 9110.00622, for more specifications. Refer also to the exciter and PA manuals for detailed specifications. Test and
measurement equipment is, where possible, calibrated in accordance with standards established by the National Institute of Standards and Technology (NIST).
Table 2-1 Specifications
characteristic
(unit of
measurement)
condition, model
specification
Electrical
RF output power
(W)
continuous duty, at PA 1-25
RF output connector
Physical and Environmental
dimensions
16 RU in standard EIA 28 x 19 x 9 in (71 x 48 x 22 cm)
cabinet (can be reduced to 14 RU in nonstandard configurations)
weight
50 lb (23 kg)
elevation
continuous operation
at rated power
to 10,000 ft (3050 m) (see temperature derating factor)
temperature
operating
-30 to +60 degrees C
storage
-30 to +70 degrees C
temperature derating factor
above 5000 ft
(1525 m)
0.5 degrees C per 100 m
humidity
operating, noncondensing
5 to 95%
Certification
Print Date: 05/10/99
country
model
identifier
USA
GL-T8200
BFL-GL-T8200
Canada
GL-T8200
Copyright © 1999 Glenayre
Page: 2-1
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
SPECIFICATIONS
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
Table 2-1 Specifications (continued)
characteristic
(unit of
measurement)
condition, model
other
specification
Contact Glenayre Sales for country-by-country type-approval information
Electrical (power supply)
Page: 2-2
ac input voltage
(Vac)
195 to 265
ac input frequency
(Hz)
47 to 440
ac input current (A)
4 max at 195 Vac to 265 Vac
Copyright © 1999 Glenayre
Print Date: 05/10/99
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
8200sys3
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
+DESCRIPTION
+DESCRIPTION
The purpose of the paging transmitter is to provide a modulated, high-level RF signal,
which sets off pagers within the coverage area of its associated antenna. The paging transmitter receives modulation and control information from the transmitter controller, which
receives information from a control site. In a simulcasting environment, the control site
may feed several paging sites at once.
3.1
Physical Description
Figure 3-1 shows a front view of the PA chassis. Refer to the transmitter ID label on the
rear of the unit for identification purposes.
3.1.1
Mounting Provisions
3.1.1.1
Transmitter Controller
The transmitter controller, normally a GL-C2000, is mounted above the exciter and may be
packaged with blank panels.
Table 3-1 Site Equipment List
equipment
part number
function
power amplifier
GL-T8200
1000.02186
amplifies 900 MHz RF for broadcast
digital DSP
exciter with I20 option
DSP EX/I20 OPT
generates then modulates RF; controls PA
I/O activities, receives fault signals and
takes action based on status
GL-S2164 Receiver
See receiver manual for
configurations and part
No.
receives data and commands from the
system controller
GL-C2000 (typical)
transmitter controller
GL-C2000
controls paging transmitter activities;
performs I/O functions for paging site
power supply module
3.1.2
ac switching power supply which converts
main power to dc voltage for the transmitter
Exciter
The exciter is one rack unit high. It is racked where shown and is held in place with four
machine screws. The top cover is removable for access to subassemblies, jumpers, and
adjustments contained in the unit. All but one of its connectors are on the back of the unit.
The front of this unit has a connector which allows the VDT to be connected to it.
Print Date: 05/10/99
Copyright © 1999 Glenayre
Page: 3-1
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
+DESCRIPTION
3.1.3
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
Power Amplifier (PA)
The transmitter PA is mounted in the rack by screws which are inserted into the angle
brackets on either side of the chassis. Access to PA fuses is gained from the front; access to
the fan and I/O connections is from the rear.
A chassis-mounted fan draws air across the PA heat sink and out the back.
Most exciter and PA fault isolations can be performed with the units mounted in the rack.
It is not recommended to troubleshoot the PA if is is defective. A defective PA should be
sent back to Glenayre.
3.1.4
Power Supply
The power supply is contained in a separate chassis which is mounted separately from the
transmitter, normally as the lowest assembly in the rack. The power supply used is an ac
switching power supply which converts main power to dc voltage for the transmitter. Refer
to power supply manuals for details.
3.1.5
Video Display Terminal (VDT)
A video display terminal (VDT) is not part of the racked-up equipment; instead, it is a piece
of test equipment which the user brings to the site when setup, maintenance, or troubleshooting is necessary; or it is used as a monitoring device. Refer to the VDT manual for
details, including cable requirements.
3.2
Simplified Paging-Site Functional Description
3.2.1
Paging Site
The following paragraphs provide a block diagram-level functional description of a typical
paging site.
Refer to Figure 3-2. This figure shows basic signal flows between the various paging site
equipment pieces. The communications device which the transmitter uses in order to
communicate with the control site is not shown and may vary from application to
application.
3.2.2
Link Equipment and Transmitter Controller
A link receiver, satellite receiver, microwave drop, telephone link, or other similar device
is used for communication between the transmitter controller and the control site. The
particular device depends on the application.
The transmitter controller is typically a model GL-C2000. There are various ways of interfacing the transmitter controller to the I/O portions of the exciter. Refer to the transmitter
controller manual and the exciter manual for details.
Page: 3-2
Copyright © 1999 Glenayre
Print Date: 05/10/99
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
+DESCRIPTION
8200sys3
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
Figure 3-1 Transmitter Front View
Print Date: 05/10/99
Copyright © 1999 Glenayre
Page: 3-3
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
+DESCRIPTION
3.2.3
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
Paging Transmitter
The paging transmitter converts the digital signal from the transmitter controller into
modulated and amplified RF power.
Operation is in response to commands from the transmitter controller via the DSP exciter.
The transmitter monitors its functions and reports its status to the VDT and the GL-C2000
via the exciter. The transmitter controller permits the transmitter to be controlled and
monitored from a remote location. Local control and monitoring are performed through a
VT-100 video deplay terminal (VDT).
The DSP exciter combines functions of an RF exciter and a PA controller. The exciter
generates modulation using digital signal processing (DSP) to achieve accurate, stable
modulation that does not vary with time or temperature. The PA-control section monitors
transmitter status signals in the form of fault logic and voltage samples. The microprocessor
in the exciter reports PA status to the transmitter controller, VDT, and the exciter front
panel. If a malfunction occurs, the transmitter enters a reduced operating condition,
depending on the seriousness of the fault. PA control and status monitoring are performed
by the microprocessor, which consolidates control logic from the transmitter controller or
the locally operated VDT. Both the exciter and transmitter controller receive continuous
status reports from the microprocessor. The exciter is the control and status-monitoring
interface between the transmitter and the user.
The DSP exciter provides up to 400 milliwatts of RF drive.
A power-reference signal from the PA is fed back to the exciter, via the PA board, to allow
control and monitoring of output power. The exciter-supplied control voltage functions as
AGC control for the PA.
3.2.4
Video Display Terminal
The VDT, though not part of the transmitter, is required for setup, local control, and local
monitoring of the transmitter. The VDT can be any laptop or desktop terminal with a VT100 type program. The VDT interfaces the transmitter through the connector on the front
of the exciter. The VDT software is menu-driven.
3.2.5
Ac Power Supply
Refer to Figure 3-1. The switching power supply is mounted below the PA. The power
supply is two rack units high. The front panel contains a dc power on indicator.
3.3
Site Signal Flows
3.3.1
Site RF-Signal Flow
The on-frequency carrier is created by the VCO circuitry in the DSP exciter. It is then
modulated with paging information, amplified, and sent to the PA via connector J3 on the
back of the DSP exciter. Through coaxial cable, the carrier goes to the back of the PA,
where it is further amplified to a preset level under control of a microprocessor within the
exciter. The amplified carrier is cabled from the PA output to a low-pass filter and a triple
Page: 3-4
Copyright © 1999 Glenayre
Print Date: 05/10/99
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
+DESCRIPTION
isolator and then to a cabinet-mounted lightning protector/connector for connection to the
antenna system. Note that some installations have a ten-MHz reference signal cabled from
the transmitter controller to connector J8 on the back of the DSP exciter.
3.3.2
Site Audio/Modulation-Signal Flow
8200sys3
Modulation information arrives at the site either through a link receiver or by wireline. The
digital signal is first routed through the transmitter controller, which checks for and
responds to appropriate embedded commands. Paging information is supplied to the
exciter. The exciter modulates this signal using digital signal processing, then up-converts
this modulated signal to final output frequency. This modulated RF from the exciter is
supplied to the PA, which amplifies the signal to the RF output level. This modulated,
amplified RF from the PA is supplied to an antenna network for transmission.
Print Date: 05/10/99
Copyright © 1999 Glenayre
Page: 3-5
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
+DESCRIPTION
3.3.3
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
Simplified Block-Diagram Description
Refer to Figure 3-2. The interface between the transmitter and the transmitter controller is
the I20 interface. Refer to the exciter manual for details.
Figure 3-2 Transmitter Simplified Block Diagram
Page: 3-6
Copyright © 1999 Glenayre
Print Date: 05/10/99
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
3.3.4
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
+DESCRIPTION
Site Control-Signal Flow
Transmitter paging-site control is done two ways:
• remotely (normally operation), and
8200sys3
• locally.
In either case, the paging transmitter is keyed when the transmitter controller commands it,
via the DSP exciter, to key.
Control functions are shared by the transmitter controller and the DSP exciter, which
controls the power amplifier. The DSP exciter also controls the power amplifier locally by
responding to commands from the VDT.
Control signals enter and exit the paging site via the transmitter controller, which has
overall control of the paging site. The transmitter controller is part of the larger paging
control system even though it is racked with paging-site equipment. The transmitter
controller has control functions which include these:
• transmitter alarm-gathering
• transmitter-alarm dispatching
• simulcast-parameter implementation
• remote control.
Remote control of the paging site is done through commands being sent to the transmitter
controller from the external paging control system.
Control commands originating from a remote site are supplied to the exciter through the
controlling device. Control and setup commands may be applied to the exciter locally
through the VDT. A microprocessor within the exciter interprets each command and
responds by performing the appropriate function.
3.3.5
Status-Signal Flow
The exciter monitors transmitter status signal in the form of fault logic and voltage samples.
The microprocessor within the exciter reports transmitter status to the controlling device,
VDT, and the exciter front panel. If a transmitter malfunction occurs, a reduced operating
condition is entered, depending on the seriousness of the fault.
Print Date: 05/10/99
Copyright © 1999 Glenayre
Page: 3-7
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
+DESCRIPTION
Page: 3-8
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
Copyright © 1999 Glenayre
Print Date: 05/10/99
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
8200sys4
4.1
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
INSTALLATION AND SETUP
INSTALLATION AND SETUP
Site Checks
4.1.1
Transmitter Environment
The transmitter environment should be clean and well ventilated. Additionally, the temperature inside the transmitter room should be maintained within the equipment specifications.
Refer to Table 4-2. The lower temperature limit is generally less of a problem due to the
heat produced by the equipment during operation, but it can become a problem in the colder
months of the year. The upper temperature limit is often a problem, especially in the
summer months. In accordance with local building codes and the permission of the building
owners, the advice of local heating and air conditioning professionals is recommended
prior to installation.
4.1.2
Inspection
Inspect the equipment to be certain that the shipment is complete. Compare items received
to the packing list. The packing list shows two portions of the equipment and options
specified on the sales order: the portion presently being shipped, and the portion still on
back order. It does not report the portion of the sales order that has already been shipped.
Report shipping loss or damage to carrier within 15 days of receipt. Remove any packing
material from the rack and check each assembly. Pay particular attention to the power
amplifier modules and power supply; check them closely and remove any foreign material
in the chassis or air cooling passages. Be certain to disconnect primary power from the
power supply before removing any equipment covers
4.1.3
Primary Power Requirement
The primary power source must be capable of delivering adequate power to the equipment.
Refer to the power supply manual. Electrical connections made to this equipment must be
made in accordance with local electrical codes.
• A switching power supply which operates in 115-Vac range and 230-Vac range. Refer to
power supply manual for specifications.
• Dc-to-dc converters may be used in some configurations.
The wire used to deliver the primary power must be large enough to safely carry the
required current. If the run of wire is too long, a larger size wire must be used to prevent
excessive voltage drop.
Print Date: 05/10/99
Copyright © 1999 Glenayre
Page: 4-1
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
INSTALLATION AND SETUP
4.2
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
Installation
Refer to Figure 4-1, for general information.
4.2.1
Tools and Equipment Required
Refer to Table 4-1. Equipment listed by brand name may be substituted with equivalent.
For installation, only common hand tools are necessary if at all, since installation is usually
completed at the factory.
Table 4-1 Required Tools and Equipment
nut driver - 5/16 in (7.9 mm)
screw driver - #2 flat blade and # 3 flat blade
screw driver - #2 Phillips and #3 Phillips
Bird 4421 RF power meter
Bird 8327 dummy load
barrel connector - type-N
cable - 1 M long (max) with type-N ends
Fluke 77 DVM
4.2.2
Rack Positioning
Cooling and cabling restraints require that equipment pieces be racked so that there is
adequate ventilation for exhaust air. The front and back of the rack should have at least ten
inches of free space. The cabinet should be placed as close as possible to the transmitting
antenna, and to the primary power source as a secondary consideration. To gain reasonable
access to the back, 30 inches (75 cm) of free space should be allowed..
Caution
Never place the rack where moisture, steam,
condensation, or standing water, can come in
contact with it. The host room may need to be air
conditioned or additionally ventilated to remove
excess heat generated by this equipment.
4.2.3
Rack Grounding
The rack cabinet must be connected to a reliable earth ground. Connect the earth ground
point to the ground stud provided in the bottom of the cabinet; use four gauge or larger
copper conductor.
Page: 4-2
Copyright © 1999 Glenayre
Print Date: 05/10/99
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
4.2.4
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
INSTALLATION AND SETUP
Positioning within the Rack
When it is used in a normal, one-transmitter-per-cabinet rackup, the transmitter should be
placed just above the power supply.
8200sys4
The transmitter is normally shipped already installed in a cabinet. To remove or reinstall
the transmitter, refer to Section 9.
DANGER
Rotating fan blades are a hazard to maintenance
personnel who access equipment from the rear.
4.2.5
Equipment Cabling
4.2.5.1
Ac and Dc Connections
Refer to Figure 4-1. Be certain that the site-environmental requirement for available ac
power has been met. A grommeted hole in the cabinet is recommended for ac power input
cable. The ac input is fused at the back of the power supply. Generally, all ac connections
internal to the rack are made at the factory and should not need to be modified. The highcurrent positive supply and negative return to the PA are between power-supply DC
OUTPUT and the large jacks in the middle of the PA (as viewed from the rear). The PA
board has fusing which connects to the transmitter controller, DSP exciter, receiver, or any
other equipment.
4.2.5.2
Dc-Only Sites
This option is available. Some installations do not use ac input power. If the transmitter is
not racked and wired at the factory, be sure to connect as shown in the documentation
supplied with the retrofit option.
4.2.5.3
Signal Connections
Refer to Figure 4-2. Generally, all control and signal connections internal to the rack are
made at the factory and should not need to be modified.
antenna-receiver
If a receiver is used, refer to the receiver manual for details.
receiver-transmitter controller
A cable runs from the rear of the receiver to the transmitter controller. Refer to the receiver
manual and the transmitter controller manual for details. Alternately, a telephone line is
connected to the transmitter controller. Some installations may have additional connections
to the transmitter controller.
transmitter-controller-exciter
A multiconductor cable runs between the transmitter controller EXCITER connector to
exciter J4. If the transmitter’s 10-MHz output is used, it goes from transmitter controller 10
MHz OUTPUT to exciter J8.
Print Date: 05/10/99
Copyright © 1999 Glenayre
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GL-T8200 1- to 25-Watt 900-MHz Transmitter System
INSTALLATION AND SETUP
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
exciter-PA
A multiconductor cable runs from exciter J6 to PA J6. The RF signal is via a coaxial jumper
from exciter J3 to PA RF input (left side of PA).
PA-transmitting antenna
PA RF output connector (point at which rated power is measured) goes to a type-N
connector on the cabinet.
4.3
Setup
Refer to the VDT manual and VDT screens for most setup information.
4.4
Ultimate Disposition
Caution
This equipment may contain hazardous materials.
Check with the local EPA or other environmental
authority before disposing of this equipment.
Page: 4-4
Copyright © 1999 Glenayre
Print Date: 05/10/99
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
INSTALLATION AND SETUP
8200sys4
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
Figure 4-1 Rear View Showing Dc and Signal Connections
Print Date: 05/10/99
Copyright © 1999 Glenayre
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GL-T8200 1- to 25-Watt 900-MHz Transmitter System
INSTALLATION AND SETUP
Page: 4-6
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
Copyright © 1999 Glenayre
Print Date: 05/10/99
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
5.1
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
OPERATION
OPERATION
Controls and Indicators
8200sys5
These assemblies within the transmitter have controls and indicators:
• PA/compartment - see PA manual
• exciter - see exciter manual
• power supply-see Paragraph 5.2.1.
5.2
Operation
The transmitter normally operates within the paging system in an unattended manner. A
control site remotely commands the transmitter controller, which, in turn, controls the
exciter and PA. Local control is not intended for operation, but for setup, checkout, or maintenance. Refer to the appropriate section:
• Section 7, MAINTENANCE
• Section 8, CHECKOUT AND TROUBLESHOOTING
• Section 9, REMOVAL AND REINSTALLATION.
Also refer to the VDT manual.
5.2.1
Turn Transmitter On and Off
The transmitter turns off and on whenever the power supply is energized. When the PA is
on, it remains in a standby condition until keyed.
5.2.2
Turn Fans On and Off
The fan does not contain an on/off switch, but turns on and off whenever the primary power
equipment is turned on and off. The fan runs continuously whenever primary power is on.
DANGER
Rotating fan blades are a hazard to maintenance
personnel who access equipment from the rear.
5.2.3
Key and Unkey PA
The PA does not contain a key switch, but is keyed and unkeyed by the exciter. The exciter
must be keyed and unkeyed remotely through transmitter controller or locally through a
video display terminal (VDT). Refer to the controller manual for remote key and unkey
instructions or to the VDT manual for local key and unkey instructions.
Print Date: 04/14/99
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GL-T8200 1- to 25-Watt 900-MHz Transmitter System
OPERATION
Page: 5-2
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
Copyright © 1999 Glenayre
Print Date: 04/14/99
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
6.1
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
THEORY OF OPERATION
THEORY OF OPERATION
Cabinet Power Distribution
8200sys6
Refer to Figure 4-2.
6.1.1
Ac Power Input
Ac power is routed from the ac mains to the power supply, which produces the dc voltage
for the cabinet. Refer to the power supply manual. The input voltage and frequency should
be within the specifications of the power supply. All electrical wiring should be done in
compliance with local electrical codes.
6.1.2
Dc Power Distribution
High current for the power amplifier is routed from the power supply connectors directly
to the main dc input on the power amplifier. Operating power for all assemblies is routed
to a PA board which is connected to all assemblies in the cabinet which require 28 volts.
The PA board has several conductors which route power from the power supply to PA
circuits and other equipment within the rack cabinet.
6.2
Cabinet Signal Distribution
Refer to Figure 4-2.
6.2.1
Control, Data, and Modulation Paths
The transmitter controller is usually a GL-C2000. It receives information at its link input
connector from a receiver, normally mounted within the cabinet, or else receive information from dedicated telephone lines. A connector from the DIGITAL LINK OUTPUT is
routed to the exciter, which provides control and modulated RF drive to the PA. RF drive
is delivered via a separate coaxial cable.
A reference signal from the exciter determines the nominal output power. Depending on the
exciter interface, the level may be remotely adjustable. The REF SAMPLE signal is fed to
the exciter, which uses it to control the power via a reference voltage. The reference voltage
serves as an AGC input, which adjusts the gain of the power amplifier.
6.2.2
Alarm Reporting
Any alarms generated within the PA are summed to the PA-fault output, which is relayed
to the exciter and transmitter controller for system response and alarm reporting.
Print Date: 03/26/99
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GL-T8200 1- to 25-Watt 900-MHz Transmitter System
THEORY OF OPERATION
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Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
Copyright © 1999 Glenayre
Print Date: 03/26/99
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
7.1
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
MAINTENANCE
MAINTENANCE
Introduction
8200sys7
Maintenance procedures in this section are listed below.
• PA-current check
• dc ripple check
7.2
Maintenance Procedures
7.2.1
PA Current Check
Occasionally, the power amplifier device currents should be compared to the levels listed
on the data sheet that accompanied the transmitter. Be sure that the operating RF output is
the same as listed on the data sheet. Also refer to the PA manual.
1.
Put transmitter in local mode.
2.
Key transmitter.
3.
Monitor power amplifier currents on VDT.
4.
Make comparison between data sheet and monitor.
Monitored currents should not vary more than ten percent from data sheet levels. An
exception is when original components or modules have been replaced or modified; in this
case, a new benchmark should be noted for future reference.
7.2.2
Dc Ripple Check
This procedure assumes that an ac power supply is part of the configuration. Occasionally
the ac supply should be checked for excessive ripple. The supply should be under normal
operating load for this procedure.
1.
Put transmitter in local mode.
2.
Key transmitter.
3.
Connect oscilloscope between ground and supply output.
4.
Set oscilloscope to read ripple.
The observed ripple level should be less than the specification given in the power supply
manual.
Print Date: 03/24/99
Copyright © 1999 Glenayre
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GL-T8200 1- to 25-Watt 900-MHz Transmitter System
MAINTENANCE
Page: 7-2
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
Copyright © 1999 Glenayre
Print Date: 03/24/99
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
CHECKOUT AND TROUBLESHOOTING
CHECKOUT AND TROUBLESHOOTING
8200sys8
Checkout procedures can be performed at any time to verify that the transmitter and related
paging site equipment is functioning properly. After the checkout procedures are successfully completed, the site can be returned to normal service. Refer to the VDT user manual
and the VDT menus for more details on checkout procedures.
8.1
Preparation for Checkout Procedures
8.1.1
Dc-Voltage Verification
Once powered, verify that equipment is powered and refer to list below.
8.1.2
1.
On power supply, PWR ON indicator is on.
2.
On G/L exciter front panel, DC POWER indicator is on.
3.
On the transmitter controller, the POWER indicator is on.
4.
On receiver (if used), the POWER indicator is on.
VDT Power-up Verification
Verify that the VDT is powered and correctly attached to the exciter; continue with the
checklist below.
• The VDT should have a cursor displayed and blinking; or,
• the VDT should have an instructional prompt displayed; or,
• the VDT should have an auto-loaded program running.
8.1.3
Cooling-Fan Check
Once the transmitter is powered, verify that the fan is operating; it should operate whenever
the transmitter is powered.
8.2
Operational Verification
The following procedures use the VDT and its various menus to control the transmitter
locally. Be certain to disable remote operation of the transmitter before performing local
tests in order to avoid unintentional keying of the equipment.
Print Date: 03/24/99
Copyright © 1999 Glenayre
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GL-T8200 1- to 25-Watt 900-MHz Transmitter System
CHECKOUT AND TROUBLESHOOTING
8.2.1
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
RF Power and Antenna
Check the transmitter’s RF output and the antenna’s reflected power with the RF-output
procedure.
RF Output and Antenna Checks
1.
Using coax jumper no longer than 1 meter, attach calibrated thruline wattmeter between antenna network and cabinet RF output connector.
2.
Key transmitter and measure output power; it should be within ten percent of expected output. Note that the expected output must take into account the attenuation of the
coaxial cable and connectors after the isolator output. Expected attenuation is typically 0.5 to 2 dB. The transmitter power specification is for output from the PA output
connector, not the transmitter cabinet. Adjust power output, if necessary.
3.
If RF output is low or none, check exciter drive with thruline wattmeter and VDT;
nominal output is 20 mW.
4.
Measure reflected power on meter (Also compare with VDT indication.) and calculate VSWR. VSWR should be less that 1.2.
5.
Using VDT, read and record PA currents.
6.
Unkey transmitter.
7.
Remove dummy load.
8.
Key transmitter. Transmitter shuts down immediately, indicating that transmitter has
detected excessive VSWR and has cut off RF output. A high-VSWR fault is recorded
on VDT.
9.
Unkey transmitter.
10. Reconfigure transmitter system normally. Verify that the PA currents correspond to
full-power values obtained in step 5.
This procedure is complete.
8.2.2
Paging
Pager function should be checked after the RF output has been verified. Determine that the
transmitter system sets off local pagers. Check pagers in all formats used by the system.
Use the normal pager-activation procedure to attempt to set off pagers. Check that pagers
are activated as expected and are not falsely activated. Note that some pagers may be
activated in a delayed manner if the system is busy or if the paging system batches paging
types so that pages of the same format go out together, rather than being dispatched in the
order in which the control site receives them.
Once pager activation has been verified, the station may be placed into service.
8.3
Field Replacement of Assemblies
Section 9 contains replacement procedures for rack assemblies which fail checkout. Refer
to the individual equipment manuals for more detailed replacement procedures.
Page: 8-2
Copyright © 1999 Glenayre
Print Date: 03/24/99
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
REMOVAL AND REINSTALLATION
REMOVAL AND REINSTALLATION
8200sys9
The following paragraphs discuss removing and reinstalling the various assemblies which
make up the transmitter. Refer to the individual equipment manuals for information on
subassemblies which may be replaced in the field.
DANGER
Remove all input power to the cabinet before
performing a removal or reinstallation procedure.
Note
The user may choose to remove the PA and exciter before removing the
transmitter chassis in order to lighten the chassis for handling.
9.1
Power Supply
Refer to the power supply manual for removal and reinstallation of the power supply.
9.2
Exciter Removal and Reinstallation
Also refer to the exciter manual. The local reference oscillator, if used, can be adjusted
while the unit is mounted in the rack.
Removal
1.
From rear of transmitter chassis, label and remove signal connectors on rear of exciter. Note that some DB-style connectors require loosening screws which hole the mating receptacles in contact with one another.
2.
Remove red (+) and black (-) wire from the exciter by loosening retaining screws.
Tape exposed end of red wire so that it does not inadvertently come in contact with
chassis.
3.
Unfasten BNC RF output plug on right side of chassis.
4.
Label and remove any other connections to exciter.
5.
On chassis front, turn screw fasteners ccw to loosen; pull exciter chassis forward and
out of transmitter chassis.
This procedure is complete.
Print Date: 03/24/99
Copyright © 1999 Glenayre
Page: 9-1
GL-T8200 1- to 25-Watt 900-MHz Transmitter System
REMOVAL AND REINSTALLATION
Glenayre Document Number: 9110.01305
Rev. A: 03/24/99
Reinstallation
When replacing the exciter, be certain that all variable subassemblies in the replacement
exciter are correct for system requirements. Subassemblies and settings which must be
matched include those included in the list below.
• VCO/RF amplifier (must be for the correct frequency band)
• firmware chips (must be of the correct revision and type)
• controller interface (must be of the proper type and revision for interfacing with the transmitter controller)
• power level (approximately 10-20 mW).
Refer to the exciter manual for additional information.
1.
Slide replacement exciter into top location of transmitter chassis.
2.
Refasten front-panel screw fasteners.
3.
Reattach and resecure connectors removed during removal process.
This procedure is complete. Refer to the exciter manual and VDT manual to check out and
realign replacement exciter.
9.3
PA Removal and Reinstallation
Refer to the PA manual.
Page: 9-2
Copyright © 1999 Glenayre
Print Date: 03/24/99

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