Glenayre Electronics GL-T8200 Users manual
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 Glenayre Document Number: 9110.01306
Document Change Record 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 GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
Rev. A: 03/23/99 Table of Contents
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
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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
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GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Glenayre Document Number: 9110.01306
Table of Contents Rev. A: 03/23/99
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
Page: -ii Copyright © 1999 Glenayre Print Date: 04/14/99
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Glenayre Document Number: 9110.01306 GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
Rev. A: 03/23/99 List of Figures
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 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
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
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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 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
1
GENERAL
1.1 Manual Scope
This manual provides information for th e 1 to 25-watt, 900-MHz power amplifier, part
number 1000.02186.
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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 Appl icable Documents
document part number function
GL-T8200 system manual 9110.01305 describes fully racked-up GL-
T8200 transmitter
1.3 Manual Sections
DSP VDT manual 9110.00259 describes DSP excit er 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
power supply manual 9110.00622 describes GL2728 power supply
Table 1-2 lists the sections of this manual with a summary of their contents.
9110.01306 this manual
equipment
Print Date: 05/10/99 Copyright © 1999 Glenayre Page: 1-1
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Glenayre Document Number: 9110.01306
GENERAL Rev. A: 03/23/99
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 po wer 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 p roper operati on, correct ion to p roper
operation of power amplifier
9. Removal and Reinstallation removal and reinstallation procedures for the PA
Page: 1-2 Copyright © 1999 Glenayre Print Date: 05/10/99
Glenayre Document Number: 9110.01306 GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
Rev. A: 03/23/99 SPECIFICATIONS
2 SPECIFICATIONS
Table 2-1 lists the significant equipment-level specifications for the power amp lifier.
Table 2-1 Power Amplifier Specifications
measurement condition specification
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Electrical
RF output power (W) continuous, at
1 to 25
output of PA
RF bandwidth (MHz) exceeds exciter bandwidth
RF input power (mW) factory-set
200-400
attenuation
RF input connector type-N female
RF output connector output of PA type-N female
input and output RF
50
impedance (ohms)
VSWR max 1.5
dc input power
voltage (Vdc)
28
current, idle/operating (A)
Mechanical and Environmental
humidity 5 to 95%, noncondensing
-30
o
to 70oC
o
to 60oC
ambient storage temperature -30
ambient operating
temperature
temperature derating factor
o
0.5
C per 100 m
above 5000 feet (1500 m)
vibration Mil-Std 810E, Method 514.4
Category 1
maximum operating
to 10,000 ft (3050 m)
elevation
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)
Print Date: 03/29/99 Copyright © 1999 Glenayre Page: 2-1
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
3 DESCRIPTION
This is a 1- to 25-wa tt PA intended for use on th e 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
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Refer to Figure 3-1 and Figure 3-2. The PA consis ts 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 P A i s mounted to the front of most standard 19-inch equipm ent racks by m eans of eight
screws. The front panel o f 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 th e P A . The PA chassis rear connector panel
has an RF input connector , an RF output co nnector , a dc power inpu t 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 Glenayre Document Number: 9110.01306
DESCRIPTION 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 GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
Rev. A: 03/23/99 DESCRIPTION
v0221.hgl
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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.
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GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Glenayre Document Number: 9110.01306
DESCRIPTION Rev. A: 03/23/99
3.2.3 Isolator
intermodulation prevention An isolator receives the RF output of the PA chassis. It prevents intermodulation of th e RF
signal that may occ ur from nearby transmissi ons and red uces radiated ha rmonics. A sampl e
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 an d filtered,
providing a dc voltage proportional to the VSWR connector on the third isolator, w hich
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 whet her 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 f orward output signal is obtained from the for ward-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 GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
Rev. A: 03/23/99 INSTALLATION AND SETUP
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.
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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 variation s are generall y not pos sible. Co oling 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 connection s 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 Glenayre Document Number: 9110.01306
INSTALLATION AND SETUP Rev. A: 03/23/99
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.
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
GROUND TB1-2 power supply
negative return
auxiliary dc outputs auxiliary power See Table 4-4.
fan supplies voltage to
PA fan
Anderson power pole (+) red
Anderson po wer pole (-) black
4.1.5.1 RF Output
Connect the antenna network to the lightning protector output. T he 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 GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
Rev. A: 03/23/99 INSTALLATION AND SETUP
Table 4-3 Exciter/PA Connector Pinout (For DSP Exciter)
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
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3 AGC reference from
exciter
4 PA ground 12 PA ground
5 PA ground 13 mux select 1 from
6 mux select 2 from
exciter
7 key input from
exciter
8 reflected sample
(combiner)
to exciter
PA
J6-x description direction
to exciter
C.S.
11 PA fault to exciter
exciter
14 mux select 3 from
exciter
15 nc
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 forw ard power
• set low-power alarm
Figure 3-2 shows controls, test points, and fuses on the PA board.
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GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Glenayre Document Number: 9110.01306
INSTALLATION AND SETUP 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 GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
Rev. A: 03/23/99 INSTALLATION AND SETUP
Table 4-4 PA Board Fuses
PA board fuse label connection
F1 (3A) powers remaining circuitry of
PA board
F2 (5A) R9000 J2-2
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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
Print Date: 05/11/99 Copyright © 1999 Glenayre Page: 4-5
GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Glenayre Document Number: 9110.01306
INSTALLATION AND SETUP Rev. A: 03/23/99
Page: 4-6 Copyright © 1999 Glenayre Print Date: 05/11/99
Glenayre Document Number: 9110.01306 GL-T8200 1- to 25-Watt 900-MHz Power Amplifier
Rev. A: 03/23/99 OPERATION
5OPERATION
5.1 Controls and Indicators
The PA has no indicators nor controls which are suitable for user adjustment.
5.2 Operation
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The transmitter normally operates within the paging system in an unattended manner . Local
control is not intended for operati on, 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 O ff
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 fro m the exci ter when it is keyed. The ex cite r is nor mally key ed an d unkey ed
remotely through transmitter controller, but it can be keyed and unkeyed locally throu gh 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 Glenayre Document Number: 9110.01306
OPERATION Rev. A: 03/23/99
Page: 5-2 Copyright © 1999 Glenayre Print Date: 05/10/99
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