Glenayre GL-T8500 User manual
Print Date: 12/17/96 Copyright © 1996 Glenayre
250-Watt Gold Line Power Amplifier Issue 1, Rev. C: 10/21/96
Specifications subject to change without notice
Copyright © 1996 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.
Gold Line GL-T8500
250-Watt, 900-MHz Power Amplifier
USER MANUAL
PN 9110.00160 (old part number = 916-8500-000)
REV C
RELEASED
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160
Document Change Record Issue 1, Rev. C: 10/21/96
Copyright © 1996 Glenayre Print Date: 12/17/96
Document Change Record
Revision: 0, Preliminary
Date: 05/04/95
Changes: none, original
Issue: Rev B
Date: 02/02/96
Changes: new format
Issue: Rev C
Date: 10/21/96
Changes: made released
Glenayre Document Number: 9110.00160 250-Watt Gold Line Power Amplifier
Issue 1, Rev. C: 10/21/96 Table of Contents
Print Date: 12/17/96 Copyright © 1996 Glenayre Page: -i
Table of Contents
1 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.1 Manual Scope . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.2 Applicable Documents. . . . . . . . . . . . . . . . . . . . . 1-1
1.3 Manual Sections . . . . . . . . . . . . . . . . . . . . . . . 1-1
2 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
3 DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.2 Physical Description. . . . . . . . . . . . . . . . . . . . . . 3-1
3.2.1 Mounting Provisions . . . . . . . . . . . . . . . . . . . . . . . .3-1
3.2.2 PA Front. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
3.2.2.1 Driver Board . . . . . . . . . . . . . . . . . . . . . .3-1
3.2.2.2 PA Boards. . . . . . . . . . . . . . . . . . . . . . . .3-4
3.2.2.3 Combiner Board. . . . . . . . . . . . . . . . . . . . .3-4
3.2.2.4 Metering Board . . . . . . . . . . . . . . . . . . . . .3-4
3.2.3 PA Rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
3.2.3.1 Isolator . . . . . . . . . . . . . . . . . . . . . . . . .3-4
3.2.3.2 Fan . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
3.2.3.3 Equipment Connectors . . . . . . . . . . . . . . . . .3-4
3.3 Functional Description. . . . . . . . . . . . . . . . . . . . . 3-5
3.3.1 RF Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5
3.3.2 Isolator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5
3.3.3 Metering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6
4 INSTALLATION AND SETUP . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.1 Installation . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.2 Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.3 Ultimate Disposition . . . . . . . . . . . . . . . . . . . . . 4-1
5 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
6 THEORY OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
6.1 Power Distribution . . . . . . . . . . . . . . . . . . . . . . 6-1
6.1.1 Primary Power . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160
Table of Contents Issue 1, Rev. C: 10/21/96
Page: -ii Copyright © 1996 Glenayre Print Date: 12/17/96
6.1.1.1 Metering Board +25V Signal Flow. . . . . . . . . . . 6-1
6.1.1.2 Power Amplifiers +25V Signal Flow. . . . . . . . . . 6-1
6.1.2 Secondary Power . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
6.1.2.1 Metering Board +13.5V Signal Flow. . . . . . . . . . 6-2
6.1.2.2 Preamplifier Module +13.5V Signal Flow . . . . . . . 6-2
6.1.3 Fan Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
6.2 RF Distribution . . . . . . . . . . . . . . . . . . . . . . . 6-3
6.2.1 Driver Board RF Flow . . . . . . . . . . . . . . . . . . . . . . . 6-3
6.2.2 PA Board RF Flow . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
6.2.3 Combiner Board RF Flow . . . . . . . . . . . . . . . . . . . . . 6-4
6.2.4 Isolator RF Flow . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
6.3 Control Distribution . . . . . . . . . . . . . . . . . . . . . 6-5
6.3.1 AGC Signal Flow. . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
6.3.2 Multiplexer Control Signal Flow . . . . . . . . . . . . . . . . . . 6-6
6.4 Status Distribution . . . . . . . . . . . . . . . . . . . . . . 6-6
6.4.1 Mux Analog Status Signal Flow . . . . . . . . . . . . . . . . . . 6-6
6.4.2 PA Fault Signal Flow. . . . . . . . . . . . . . . . . . . . . . . . 6-6
7 MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
8 CHECKOUT AND TROUBLESHOOTING . . . . . . . . . . . . . . . . . . 8-1
9 REMOVAL AND REINSTALLATION . . . . . . . . . . . . . . . . . . . . 9-1
9.1 PA Chassis Removal and Reinstallation . . . . . . . . . . . . . 9-1
9.2 PA RF Module Removal and Reinstallation . . . . . . . . . . . . 9-1
9.3 Metering Board Removal and Reinstallation . . . . . . . . . . . . 9-1
Glenayre Document Number: 9110.00160 250-Watt Gold Line Power Amplifier
Issue 1, Rev. C: 10/21/96 List of Figures
Print Date: 12/17/96 Copyright © 1996 Glenayre Page: -iii
List of Figures
Figure 3-1 250-Watt, 900-MHz Power Amplifier
Front View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Figure 3-2 250-Watt, 900-MHz Power Amplifier
Rear View. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Figure 3-3 PA Simplified-Block Diagram . . . . . . . . . . . . . . . . . . . . . . 3-5
Figure 5-1 Front-Panel View with Cover Removed . . . . . . . . . . . . . . . . . 5-2
Figure 6-1 250-Watt PA Interconnection Diagram. . . . . . . . . . . . . . . . . . 6-8
Figure 6-2 250-Watt PA Functional Diagram . . . . . . . . . . . . . . . . . . . . 6-9
Figure 6-3 250-Watt PA Detailed Functional Diagram . . . . . . . . . . . . . . .6-10
Figure 6-4 Metering Board Functional Diagram . . . . . . . . . . . . . . . . . . .6-12
Figure 9-1 PA Removal and Reinstalllation . . . . . . . . . . . . . . . . . . . . . 9-2
Figure 9-2 PA RF Module Removal and Reinstallation . . . . . . . . . . . . . . . 9-3
Figure 9-3 Metering Board Removal and Reinstallation . . . . . . . . . . . . . . . 9-5
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160
List of Figures Issue 1, Rev. C: 10/21/96
Page: -iv Copyright © 1996 Glenayre Print Date: 12/17/96
Glenayre Document Number: 9110.00160 250-Watt Gold Line Power Amplifier
Issue 1, Rev. C: 10/21/96 List of Tables
Print Date: 12/17/96 Copyright © 1996 Glenayre Page: -v
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 3-1 PA Circuit Boards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Table 6-1 Multiplexer Analog Status Inputs. . . . . . . . . . . . . . . . . . . . . 6-7
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160
List of Tables Issue 1, Rev. C: 10/21/96
Page: -vi Copyright © 1996 Glenayre Print Date: 12/17/96
Glenayre Document Number: 9110.00160 250-Watt Gold Line Power Amplifier
Issue 1, Rev. C: 10/21/96 GENERAL
Print Date: 12/17/96 Copyright © 1996 Glenayre Page: 1-1
1 GENERAL
1.1 Manual Scope
This manual provides information for the 250-watt, 900-MHz Gold Line power amplifier,
part number 265-0082-013. Also included is information for the optional triple isolator,
part number 7914.00010.
1.2 Applicable Documents
This manual is incomplete without additional Gold Line manuals. Refer to Table 1-1 fora
listing and function of these manuals.
1.3 Manual Sections
Table 1-2 lists the sections of this manual with a summary of their contents.
Table 1-1 Applicable Documents
document part number function
GL-T8500/8600 system man-
ual 9110.00163 describes fully racked-up Gold
Line transmitter
VDT manual 9110.00164 describes PA control software
installed in exciter
exciter manual 9110.00172 describes exciter/PA control
equipment in transmitter
250-watt PA 9110.00160 this manual
power supply manual 9110.00159 describes 50A/90A power supply
equipment in transmitter
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160
GENERAL Issue 1, Rev. C: 10/21/96
Page: 1-2 Copyright © 1996 Glenayre Print Date: 12/17/96
Table 1-2 Manual Sections
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 replacement procedures for power amplifier and
selected subassemblies
Glenayre Document Number: 9110.00160 250-Watt Gold Line Power Amplifier
Issue 1, Rev. C: 10/21/96 SPECIFICATIONS
Print Date: 12/17/96 Copyright © 1996 Glenayre Page: 2-1
2 SPECIFICATIONS
Table 2-1 lists the significant equipment-level specifications for the Gold Line power
amplifier.
Table 2-1 Power Amplifier Specifications
measurement specification
height 8.75 in (22.23 cm)
width 19 in (48.3 cm)
depth 8 in (20.3 cm)
weight 26 lb (12 kg)
RF output power 100 - 250 watts
RF bandwidth 900 - 960 MHz
RF input power 200 - 400 mW
RF impedance 50 ohms
operating voltages 25 vdc, 25 Vdc, 13.5 Vdc
PA 25 Vdc current 72 mA - 33 A
fan 25 Vdc current 750 mA
13.5 Vdc current 3.3 A
ambient temperature -30° - +70° C
humidity 0 - 95% noncondensing
altitude to 10,000 ft (3050 m)
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160
SPECIFICATIONS Issue 1, Rev. C: 10/21/96
Page: 2-2 Copyright © 1996 Glenayre Print Date: 12/17/96
Glenayre Document Number: 9110.00160 250-Watt Gold Line Power Amplifier
Issue 1, Rev. C: 10/21/96 DESCRIPTION
Print Date: 12/17/96 Copyright © 1996 Glenayre Page: 3-1
3 DESCRIPTION
3.1 Introduction
Figure 3-1, 250-Watt, 900-MHz Power Amplifier Front View, and Figure 3-2, 250-Watt,
900-MHz Power Amplifier Rear View,show the Gold Line power amplifier (PA). This is a
250-watt PA intended for use in a GL-T8500 paging transmitter with an RF of 900 MHz
nominal. This PA is characterized by integrated monitoring devices that supply critical
status information to a Gold Line exciter/PA control (exciter). This exciter contains diag-
nostic software that can detect and report a faulty PA circuit board.
3.2 Physical Description
3.2.1 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.
Two quarter-turn fasteners secure the front panel to the PA. Most PA circuit boards may be
replaced while the PA is mounted in the rack.
3.2.2 PA Front
Figure 5-1 shows the front view of the PA with thefront panel removed. This exposes the
RF and shielded compartments, which contain the PA circuit boards. Table 3-1 lists the PA
circuit boards.
3.2.2.1 Driver Board
The driver board (A1) contains the preamp module, the intermediate PA (IPA), and the PA
drivers (driver-1 and driver-2). These devices, in addition to one resistor, are mounted
directly on the PA heat sink. The driver board contains three connectors: two on the front
(J1 and J2) and one on the back (J3). Two RG316-type cables (not shown) are attached to
the front of the board.
Table 3-1 PA Circuit Boards
nomenclature part number location
driver board A1 263-0082-022 RF compartment
PA1 board A2 263-0082-007 RF compartment
PA2 board A3 263-0082-007 RF compartment
combiner board A4 263-0082-021 RF compartment
metering board A5 263-0082-018 shielded compartment
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160
DESCRIPTION Issue 1, Rev. C: 10/21/96
Page: 3-2 Copyright © 1996 Glenayre Print Date: 12/17/96
v0222.hgl
Figure 3-1 250-Watt, 900-MHz Power Amplifier
Front View
Glenayre Document Number: 9110.00160 250-Watt Gold Line Power Amplifier
Issue 1, Rev. C: 10/21/96 DESCRIPTION
Print Date: 12/17/96 Copyright © 1996 Glenayre Page: 3-3
v0221.hgl
Figure 3-2 250-Watt, 900-MHz Power Amplifier
Rear View
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160
DESCRIPTION Issue 1, Rev. C: 10/21/96
Page: 3-4 Copyright © 1996 Glenayre Print Date: 12/17/96
3.2.2.2 PA Boards
Two PA boards, PA1 (A2) and PA2 (A3), contain the power amplifiers. The PA boards are
identical but are mounted with different orientations. Each PA board contains an A and a B
pair of power amplifiers. These amplifiers and six resistors are mounted directly on the PA
heat sink. Connectors J1 and J3 and an RG142-type cable (not shown) are attached to the
front of each board.
3.2.2.3 Combiner Board
The combiner board combines the outputs of the PA boards. The combiner board contains
a resistor, mounted directly on the PA heat sink. Connectors J1, J2, and J3 are on the front
of the board. An RG393-type cable is attached to the back of the board. This cable termi-
nates with a type-N connector and extends through the rear of the PA.
3.2.2.4 Metering Board
The metering board contains the monitoring circuits for the PA. A bank of nine automotive
spade-type fuses protect the PA. A transistor is mounted directly on the PA heat sink. The
metering board contains connectors J1, J2, J4, J5, and P1 on the front and J3 on the back.
The board contains one LED (DC POWER).
3.2.3 PA Rear
Figure 3-2 shows the back view of the PA. The PA back panel conceals the fan compart-
ment. The isolator and fan are mounted on the back panel. The PA equipment connectors
terminate on cables that are routed through grommeted holes in the back panel.
3.2.3.1 Isolator
The standard isolator (shown) improves the intermodulation performance of the PA by 25
dB. This isolator is mounted on its own heat sink, which extends into the fan compartment.
The optional triple isolator (not shown) improves the intermodulation performance of the
PA by 75 dB, and is mounted on the PA. Both isolators contains three connectors: two type-
N and one BNC.
3.2.3.2 Fan
A single fan provides cooling for the PA and standard isolator. The fan is located within the
fan compartment and is covered by a finger guard. The fan runs continuously whenever
power is applied by the power supply equipment.
3.2.3.3 Equipment Connectors
There are five equipment connectors in addition to those on the isolator. Two 1/4-inch ring
lugs are designated as plus (red) and minus (black). A 9-pin plug-and-socket connector is
designated as P2. A DB15-type connector is designated as PA CONTROL. A BNC
connector is designated as P3.
Glenayre Document Number: 9110.00160 250-Watt Gold Line Power Amplifier
Issue 1, Rev. C: 10/21/96 DESCRIPTION
Print Date: 12/17/96 Copyright © 1996 Glenayre Page: 3-5
3.3 Functional Description
Figure 3-3 shows a simplified, functional diagramof the PA. The driver, combiner, and PA
boards constitute the RF amplifier circuitry of the PA. Monitoring and controlling this RF
amplifier is the metering board. Figure 3-1 shows the RF amplifier, isolator, and metering
circuitry within the PA.
Figure 3-3 PA Simplified-Block Diagram
3.3.1 RF Amplifier
The RF amplifier receives its RF input through the BNC connector P3. A detector circuit
in the RF amplifier monitors this RF input. The RF input is amplified by means of four
amplifier stages. Each amplifier stage receives its dc input power through the metering
circuit. Power detectors at critical locations throughout the RF amplifier provide sample
voltages to the metering circuit. The amplified output of the RF amplifier is applied to the
input type-N connector on the isolator.
3.3.2 Isolator
The isolator prevents intermodulation of the RF signal that may occur from nearby trans-
missions. The RF signal is routed through input and output type N connectors. A detector
circuit in the isolator monitors the reflected power (VSWR) present at the output type-N
connector. A sample voltage representing the VSWR level is output through the BNC
connector. The optional triple isolator functions identically to the standard isolator except
with a higher level of intermodulation prevention.
BNC
STATUS/
CONTROL
RF
AMPLIFIER
RF
IN
A
AA
A
A
AA
A
A
AA
A
A
AA
A
A
AA
A
A
AA
A
A
AA
A
AAAA
ISOLATOR
A
AA
A
A
AA
A
A
AA
A
A
AA
A
A
AA
A
A
AA
A
A
AA
A
AAAA
AA
A
AA
A
AA
A
AA
A
AA
A
AA
A
AA
A
AAA
AAAA
A
AAA
A
AAA
AAAA
AAAA
AAAA
RF
OUT
METERING
METERED
POWER
STATUS
VOLTAGES
DC
IN
25V
AAAA
A
AA
A
A
AA
A
A
AA
A
A
AA
A
A
AA
A
A
AA
A
A
AA
A
A
AA
A
A
AA
A
A
AA
A
A
AA
A
A
AA
A
A
AA
A
A
AA
A
AAAA
13.5V
TYPE N TYPE N
DB-15
VSWR
SAMPLE
BNC
1/4 LUGS
P2
POWER
AMPLIFIER
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160
DESCRIPTION Issue 1, Rev. C: 10/21/96
Page: 3-6 Copyright © 1996 Glenayre Print Date: 12/17/96
3.3.3 Metering
The metering board performs control and status reporting for the PA. The metering board
accepts a 25-Vdc power input through the 1/4-inch lugs and a 13.5-Vdc power input
through connector P2. These voltages are regulated and distributed.
Glenayre Document Number: 9110.00160 250-Watt Gold Line Power Amplifier
Issue 1, Rev. C: 10/21/96 INSTALLATION AND SETUP
Print Date: 12/17/96 Copyright © 1996 Glenayre Page: 4-1
4 INSTALLATION AND SETUP
4.1 Installation
The PA is shipped already installed in a cabinet. To remove or reinstall the PA, refer to
Section 9.
4.2 Setup
Setup of the PA is performed at the system level using an exciter/PA control unit. Refer to
the GL-T8500 system manual. The system manual includes instructions for these
applicable setup procedures:
•adjust forward power
•set low power alarm
•calibrate reflected power
4.3 Ultimate Disposition
Caution
This equipment may contain hazardous materials.
Check with the local EPA or other environmental
authority before disposing of this equipment.
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160
INSTALLATION AND SETUP Issue 1, Rev. C: 10/21/96
Page: 4-2 Copyright © 1996 Glenayre Print Date: 12/17/96
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