Glenayre GL-T8200 User manual

Print Date: 03/23/99 Copyright © 1999 Glenayre
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Rev. A: 03/23/99
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.
GL-T8200
1- to 25-Watt, 900-MHz Power Amplifier
USER MANUAL
PN 9110.01306
REV A

GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Glenayre Document Number: 9110.01306
Document Change Record Rev. A: 03/23/99
Copyright © 1999 Glenayre Print Date: 03/23/99
Document Change Record
Revision: Revision A
Date: 03/23/99
Changes: none, original

Glenayre Document Number: 9110.01306 GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
Rev. A: 03/23/99 Table of Contents
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Print Date: 04/14/99 Copyright © 1999 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 Physical Description. . . . . . . . . . . . . . . . . . . . . . 3-1
3.1.1 Mounting Provisions . . . . . . . . . . . . . . . . . . . . . . . .3-1
3.1.2 PA Chassis Rear Connector Panel . . . . . . . . . . . . . . . . .3-1
3.2 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
4 INSTALLATION AND SETUP . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.1 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
4.2 Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4.2.1 Expected Exciter . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
4.2.2 Setup Using VDT . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
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 Fan Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
6.1.2 High-Current Power to PA Board. . . . . . . . . . . . . . . . . .6-1
6.1.3 Metering Circuit Regulators . . . . . . . . . . . . . . . . . . . .6-1
6.2 RF Flow . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Glenayre Document Number: 9110.01306
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6.3 PA Board . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
6.3.1 Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
6.3.2 Internally Generated Voltages . . . . . . . . . . . . . . . . . . 6-3
6.4 Exciter Interface . . . . . . . . . . . . . . . . . . . . . . . 6-5
6.4.1 Exciter Interface Connector Pinout. . . . . . . . . . . . . . . . . 6-5
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 MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
7.1 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
7.2 Power Calibration . . . . . . . . . . . . . . . . . . . . . . 7-1
8 CHECKOUT AND TROUBLESHOOTING . . . . . . . . . . . . . . . . . . 8-1
8.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . 8-1
8.2 Checkout Procedures . . . . . . . . . . . . . . . . . . . . . 8-1
8.2.1 VDT Power-Up Verification . . . . . . . . . . . . . . . . . . . . 8-1
8.2.2 Dc Voltage Verification . . . . . . . . . . . . . . . . . . . . . . 8-1
8.3 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
9 REMOVAL AND REINSTALLATION . . . . . . . . . . . . . . . . . . . . 9-1
9.1 PA . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
9.1.1 Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
9.1.2 Reinstallation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1

Glenayre Document Number: 9110.01306 GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
Rev. A: 03/23/99 List of Figures
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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

GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Glenayre Document Number: 9110.01306
List of Figures Rev. A: 03/23/99
Page: -iv Copyright © 1999 Glenayre Print Date: 04/14/99

Glenayre Document Number: 9110.01306 GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
Rev. A: 03/23/99 List of Tables
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Print Date: 04/14/99 Copyright © 1999 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 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

GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Glenayre Document Number: 9110.01306
List of Tables Rev. A: 03/23/99
Page: -vi Copyright © 1999 Glenayre Print Date: 04/14/99

Glenayre Document Number: 9110.01306 GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
Rev. A: 03/23/99 GENERAL
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1
GENERAL
1.1 Manual Scope
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.
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-T8200 system manual 9110.01305 describes fully racked-up GL-
T8200 transmitter
DSP VDT manual 9110.00259 describes DSP exciter software in-
stalled 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

GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Glenayre Document Number: 9110.01306
GENERAL Rev. A: 03/23/99
Page: 1-2 Copyright © 1999 Glenayre Print Date: 05/10/99
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 removal and reinstallation procedures for the PA

Glenayre Document Number: 9110.01306 GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
Rev. A: 03/23/99 SPECIFICATIONS
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2 SPECIFICATIONS
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 1 to 25
RF bandwidth (MHz) exceeds exciter bandwidth
RF input power (mW) factory-set
attenuation 200-400
RF input connector type-N female
RF output connector output of PA type-N female
input and output RF
impedance (ohms) 50
VSWR max 1.5
dc input power
voltage (Vdc)
current, idle/operating (A) 28
Mechanical and Environmental
humidity 5 to 95%, noncondensing
ambient storage temperature -30o to 70oC
ambient operating
temperature -30oto 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)

GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Glenayre Document Number: 9110.01306
SPECIFICATIONS Rev. A: 03/23/99
Page: 2-2 Copyright © 1999 Glenayre Print Date: 03/29/99

Glenayre Document Number: 9110.01306 GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
Rev. A: 03/23/99 DESCRIPTION
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3 DESCRIPTION
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.

GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Glenayre Document Number: 9110.01306
DESCRIPTION Rev. A: 03/23/99
Page: 3-2 Copyright © 1999 Glenayre Print Date: 05/10/99
v0222.hgl
Figure 3-1 PA Front Isometric View

Glenayre Document Number: 9110.01306 GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
Rev. A: 03/23/99 DESCRIPTION
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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.

GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Glenayre Document Number: 9110.01306
DESCRIPTION Rev. A: 03/23/99
Page: 3-4 Copyright © 1999 Glenayre Print Date: 05/10/99
3.2.3 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 VSWR-
detection 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.

Glenayre Document Number: 9110.01306 GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
Rev. A: 03/23/99 INSTALLATION AND SETUP
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4 INSTALLATION AND SETUP
4.1 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 commonhand tools are necessary if at all, since equipment integration
is usually completed at the factory.
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.
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

GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Glenayre Document Number: 9110.01306
INSTALLATION AND SETUP Rev. A: 03/23/99
Page: 4-2 Copyright © 1999 Glenayre Print Date: 05/11/99
4.1.5 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.
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.
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

Glenayre Document Number: 9110.01306 GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
Rev. A: 03/23/99 INSTALLATION AND SETUP
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4.2 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.
Table 4-3 Exciter/PA Connector Pinout (For DSP Exciter)
PA
J6-x description direction PA J6-x description direction
1 analog 1 to exciter 9 analog 2 to exciter
2 analog 3 to exciter 10 analog 4/aux. for
C.S. to exciter
3 AGC reference from
exciter 11 PA fault to exciter
4 PA ground 12 PA ground
5 PA ground 13 mux select 1 from
exciter
6 mux select 2 from
exciter 14 mux select 3 from exciter
7 key input from
exciter 15 nc
8 reflected sample
(combiner) to exciter

GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Glenayre Document Number: 9110.01306
INSTALLATION AND SETUP Rev. A: 03/23/99
Page: 4-4 Copyright © 1999 Glenayre Print Date: 05/11/99
Figure 4-1 PA Rear View