Glenayre Electronics GL-T8311SA User Manual

GL-T8xx1 Transmitter System Revision K: 08/30/99
GL-T8311, GL-T8321, GL-T8331, GL-T8411, GL-T8521, GL-T8531, and GL-T8611 Transmitters
USER MANUAL PN 9110.00166 (old pn = 916-8B21-001)
REV K
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.
Copyright © 1999 Glenayre
GL-T8xx1 Transmitter System Glenayre Document Number: 9110.00166 Document Change Record Revision K: 08/30/99

Document Change Record

Issue: 1, Preliminary Date: Changes: none, original
Issue: 1, Preliminary Date: 06/19/95 Changes: front page...part number, copyright
Issue: 1, Released, Rev C Date: 04/29/96 Changes: obtained released status
Issue: 1, Released, Rev D Date: 07/08/96 Changes: fan control...metering board...I20 control
Issue: 1, Released, Rev E Date: 02/26/97 Changes: changed jumper table settings on metering board functional diagram
Issue: 1, Released, Rev F Date: 06/18/97 Changes: added new metering bd. info w/pics ... added info to sp ecifications
Issue: 1, Released, Rev G Date: 10/17/97 Changes: changed ty pical PA top view picture reflecting switching of low-pass filter
and directional coupler board on GL-T8521 and GL-T8321 transmitters
Issue: 1, Released, Rev H Date: 12/01/97 Changes: updated schematics of metering boards 2000.00116 and 200 0.00513; delete d
reference for using 2000.0 0513 o n GL-T852 1, GL-T832 1, GL-T8531, or GL-T83 31 t rans­mitters; deleted reference for using 2000.00116 on GL-T8311, GL-T8411, or GL-T86 11 transmitters; updated jumper settings on 2000.00116
Issue: 1, Released, Rev J Date: 05/14/99 Changes: Added information defining the three meter (3m) limitation on the 28Vdc
power cable.
Issue: 1, Released, Rev K Date: 8/30/99 Changes: added RF output measurement at output of PA or circulator in specifications
Copyright © 1999 Glenayre
Glenayre Document Number: 9110.00166 GL-T8xx1 Transmitter System Revision K: 08/30/99 Table of Contents

Table of Contents

1 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.1 Manual Scope . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.2 Applicable Documents. . . . . . . . . . . . . . . . . . . . . 1-1
1.3 About Glenayre . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.3.1 Product Warranty Information . . . . . . . . . . . . . . . . . . .1-4
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1.3.2 Service Warranty Information . . . . . . . . . . . . . . . . . . .1-4
2 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
3 DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1 Conceptual Description . . . . . . . . . . . . . . . . . . . . 3-1
3.2 Physical Description. . . . . . . . . . . . . . . . . . . . . . 3-1
3.2.1 Mounting Provisions . . . . . . . . . . . . . . . . . . . . . . . .3-1
3.2.1.1 PA and Exciter Assemblies . . . . . . . . . . . . . . .3-1
3.2.1.2 Power Supply . . . . . . . . . . . . . . . . . . . . . .3-1
3.2.1.3 Video Display Terminal. . . . . . . . . . . . . . . . .3-2
3.3 Simplified Paging-Site Functional Description . . . . . . . . . . . 3-3
3.3.1 Paging Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3
3.3.2 Communications Equipment and Transmitter Controller. . . . . .3-3
3.3.3 Paging Transmitter . . . . . . . . . . . . . . . . . . . . . . . . .3-3
3.3.3.1 DSP Exciter . . . . . . . . . . . . . . . . . . . . . . .3-3
3.3.3.2 Power Amplifier RF Compartment . . . . . . . . . . .3-7
3.3.3.3 Metering Board . . . . . . . . . . . . . . . . . . . . .3-7
3.3.3.4 Power Supply . . . . . . . . . . . . . . . . . . . . . .3-7
3.3.3.4.1 Ac-Powered Sites. . . . . . . . . . . . . . . . . . .3-7
3.3.3.4.2 Dc-Powered Sites. . . . . . . . . . . . . . . . . . .3-7
3.3.4 Video Di splay Terminal. . . . . . . . . . . . . . . . . . . . . . .3-7
3.4 Site Signal Flows . . . . . . . . . . . . . . . . . . . . . . . 3-8
3.4.1 Site RF-Signal Flow. . . . . . . . . . . . . . . . . . . . . . . . .3-8
3.4.2 Site Audio-Signal Flow . . . . . . . . . . . . . . . . . . . . . . .3-8
3.4.3 Site Control-Signal Flow . . . . . . . . . . . . . . . . . . . . . .3-8
3.4.4 Status-Signal Flow . . . . . . . . . . . . . . . . . . . . . . . . .3-9
Copyright © 1999 Glenayre Page: -i
GL-T8xx1 Transmitter System Glenayre Document Number: 9110.00166 Table of Contents Revision K: 08/30/99
4 INSTALLATION AND SETUP . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.1 Inspection . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.2.1 Tools and Equipment Required. . . . . . . . . . . . . . . . . . . 4-1
4.2.2 Rack Positi oning . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.2.3 Rack Grounding . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
4.2.4 Positioning within the Rack . . . . . . . . . . . . . . . . . . . . 4-2
4.2.5 Primary Power Requirements. . . . . . . . . . . . . . . . . . . . 4-2
4.2.5.1 Special Considerations . . . . . . . . . . . . . . . . . 4-3
4.2.6 Equipment Cabling . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4.2.6.1 Ac Connections. . . . . . . . . . . . . . . . . . . . .4-3
4.2.6.2 Dc Connections. . . . . . . . . . . . . . . . . . . . .4-3
4.2.6.3 Dc-Only Sites. . . . . . . . . . . . . . . . . . . . . . 4-3
4.2.7 PA Chassis Connections . . . . . . . . . . . . . . . . . . . . . . 4 -3
4.2.8 Metering Board Connections . . . . . . . . . . . . . . . . . . . . 4-4
4.2.9 System Connectors . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
4.2.10 I20 Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
4.3 Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
4.4 Ultimate Disposition . . . . . . . . . . . . . . . . . . . . . 4-10
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 Fan(s) Control . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
5.2.3 Key and Unkey PA . . . . . . . . . . . . . . . . . . . . . . . . . 5 -2
6 THEORY OF OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
6.1 Metering Board . . . . . . . . . . . . . . . . . . . . . . . 6-1
6.1.1 Dc-Power Di stribution . . . . . . . . . . . . . . . . . . . . . . . 6-1
6.1.2 Control-Signal Distribution. . . . . . . . . . . . . . . . . . . . . 6-1
6.1.2.1 Transmitter Keying . . . . . . . . . . . . . . . . . . .6-1
6.1.2.2 Power-Output Control . . . . . . . . . . . . . . . . . 6-1
6.1.2.3 Signal Measurement and Alarm Gathering. . . . . . . 6-6
6.1.2.4 PA Fault. . . . . . . . . . . . . . . . . . . . . . . . . 6-6
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Glenayre Document Number: 9110.00166 GL-T8xx1 Transmitter System Revision K: 08/30/99 Table of Contents
7 MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
7.1 General. . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
7.2 PA-Current Check . . . . . . . . . . . . . . . . . . . . . . 7-1
7.3 Dc-Ripple Check . . . . . . . . . . . . . . . . . . . . . . . 7-2
8 CHECKOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
8.1 General. . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
8.2 Checkout Procedures . . . . . . . . . . . . . . . . . . . . . 8-1
8.2.1 Dc-Vol tage Verification . . . . . . . . . . . . . . . . . . . . . .8-1
8.2.2 VDT Power-up Verification . . . . . . . . . . . . . . . . . . . .8-2
8.2.3 Cooling-Fans Check . . . . . . . . . . . . . . . . . . . . . . . .8-2
9 REMOVAL AND REINSTALLATION. . . . . . . . . . . . . . . . . . . . . 9-1
9.1 Transmitter Chassis . . . . . . . . . . . . . . . . . . . . . . 9-1
9.2 Power Supply . . . . . . . . . . . . . . . . . . . . . . . . 9-1
9.3 PA RF Compartment . . . . . . . . . . . . . . . . . . . . . 9-1
9.4 Exciter Removal and Reinstallation. . . . . . . . . . . . . . . . 9-2
9.5 Metering Board Removal and Reinstallation . . . . . . . . . . . . 9-3
9.6 Fan Removal and Reinstallation . . . . . . . . . . . . . . . . . 9-4
Copyright © 1999 Glenayre Page: -iii
GL-T8xx1 Transmitter System Glenayre Document Number: 9110.00166 Table of Contents Revision K: 08/30/99
Page: -iv Copyright © 1999 Glenayre
Glenayre Document Number: 9110.00166 GL-T8xx1 Transmitter System Revision K: 08/30/99 List of Figures

List of Figures

Figure 3-1 Transmitter Chassis Isometric Front View . . . . . . . . . . . . . . . . 3-2
Figure 3-2 Typical PA Top Views . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Figure 3-3 Transmitter Functional Diagram . . . . . . . . . . . . . . . . . . . . . 3-9
Figure 4-1 Transmitter Rear View with Door Open . . . . . . . . . . . . . . . . . 4-5
Figure 4-2 Transmitter Chassis Pictorialized Schematic . . . . . . . . . . . . . . . 4-6
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Figure 5-1 Metering Board Assembly 2000.00116. . . . . . . . . . . . . . . . . . 5-3
Figure 5-2 Metering Board Assembly 2000.00513. . . . . . . . . . . . . . . . . . 5-4
Figure 6-1 Metering Board 2000.00116 Functional Diagram . . . . . . . . . . . . 6-2
Figure 6-2 Metering Board 2000.00513 Functional Diagram . . . . . . . . . . . . 6-4
Copyright © 1999 Glenayre Page: -v
GL-T8xx1 Transmitter System Glenayre Document Number: 9110.00166 List of Figures Revision K: 08/30/99
Page: -vi Copyright © 1999 Glenayre
Glenayre Document Number: 9110.00166 GL-T8xx1 Transmitter System Revision K: 08/30/99 List of Tables

List of Tables

Table 1-1 Applicable Documents . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Table 2-1 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Table 4-1 Tools and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Table 4-2 PA Chassis Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Table 4-3 Metering Board Connectors. . . . . . . . . . . . . . . . . . . . . . . . 4-4
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Table 4-4 Exciter J6-to-Metering Board DB-15 J6 Pin F unctions . . . . . . . . . 4-7
Table 4-5 Metering Board Jumper Table for Transmitter Setups (w/ assembly 2000.00116)4-8 Table 4-6 Metering Board Jumper Table for Transmitter Setups (w/ assembly 2000.00513)4-8 Table 4-7 Detail of J1 Connections (DB-25) between
Metering Board and PA RF Compartment . . . . . . . . . . . . . . . . 4-9
Table 5-1 Metering Board Fuses, Indicators, and Tes t Points . . . . . . . . . . . . 5-2
Table 6-1 Input-Select Metering Lines from Exciter . . . . . . . . . . . . . . . . 6-6
Copyright © 1999 Glenayre Page: -vii
GL-T8xx1 Transmitter System Glenayre Document Number: 9110.00166 List of Tables Revision K: 08/30/99
Page: -viii Copyright © 1999 Glenayre
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Glenayre Document Number: 9110.00166 GL-T8xx1 Transmitter System Revision K: 08/30/99 GENERAL

1 GENERAL

1.1 Manual Scope

This manual provides information for the following transmitters:
• 325-watt, 280-MHz transmitter, model GL-T8521
• 325-watt, 320-MHz transmitter, model GL-T8531
• 125-watt, 280-MHz transmitter, model GL-T8321
• 125-watt, 320-MHz transmitter, model GL-T8331
• 450-watt, 150-MHz transmitter, model GL-T8611
• 225-watt, 150-MHz transmitter, model GL-T8411
• 125-watt, 150-MHz transmitter, model GL-T8311.

1.2 Applicable Documents

This manual is incomplete without additional manuals. See Table 1-1, Applicable Docu­ments, for a listing and function of these manuals.
Copyright © 1999 Glenayre Page: 1-1
GL-T8xx1 Transmitter System Glenayre Document Number: 9110.00166 GENERAL Revision K: 08 /30/99
Table 1-1 Applicable Documents
Document Part number Note
GL-T8xx1 Transmitter System Manual 9110.00166 this manual Assembled GL-T8411 manual 9100.00738 can provide a complete set of manuals for a transmitter Assembled GL-T8611 manual 9100.00739 can provide a complete set of manuals for a transmitter DSP VDT Manual 9110.00259 describes dSP exciter software installed in exciter DSP exciter User Manual 9110.00172 describes DSP exciter hardware equipment in transmitter GL-C2000 User Manual 9110.01167 describes GL-C2000, v. 330, controller hardware and soft-
ware GL-T8521/8531 PA User Manual 9110.00167 describes 325-watt PA, 280 and 300 MHz GL-T8321/8331 PA User Manual 9110.00168 describes 125-watt PA, 280 and 300 MHz GL-T8611 PA User Manual 9110.00255 describes 450-watt, 150-MHz PA GL-T8411 PA User Manual 9110.00256 describes 225-watt, 150-MHz PA GL-T8311 PA User Manual 9110.00247 describes 125-watt, 150-MHz PA Dc Breaker / Fuse Panel User Manual 9110.00258 describes the dc control panel for all dc or external supplies GL-T8311 w/I20 Upgrade 9110.00804 describes upgrade process for C2000 controller GL-T8411 w/I20 Upgrade 9110.00271 describes upgrade process for C2000 controller GL-T8611 w/I20 Upgrade 9110.00803 describes upgrade process for C2000 controller Power Supply User Manual 9110.00257 describes ferroresonant ac-to-dc power supply Power Supply User Manual 9130.00001 describes switching ac-to-dc power supply
Page: 1-2 Copyright © 1999 Glenayre
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Glenayre Document Number: 9110.00166 GL-T8xx1 Transmitter System Revision K: 08/30/99 GENERAL

1.3 About Glenayre

For an updated list of Glenayre locations, refer to www.glenayre.com/corporate/ contacts/default.asp .
Questions regarding Glenayre equipment or this manual should be directed to:
U.S.A. CANADA Glenayre Customer Service - RF Glenayre Customer Service - RF One Glenayre Way 1570 Kootenay Street Quincy, Illinois 62301 Vancouver, B.C. V5K 5B8 Canada Phone: (217) 223-3211 Phone: (604) 293-1611 Fax: (217) 223-3284 Fax: (604) 293-4301
UNITED KINGDOM SINGAPORE Glenayre Electronics (UK) Ltd. Glenayre Electronics Pte. Ltd. Unit 22, Challenge House Block 5012 Ang Mo Kio Avenue 5 Sherwood Drive, Bletchley TechPlace II Unit 0503 Milton Keynes, MK3 6JD UK Singapore 2056 Phone: 44 1 908 644 642 Phone: (65) 481-1828 Fax: 44 1 908 644 643 Fax: (65) 481-2838
Copyright © 1999 Glenayre Page: 1-3
GL-T8xx1 Transmitter System Glenayre Document Number: 9110.00166 GENERAL Revision K: 08 /30/99

1.3.1 Product Warranty Information

Glenayre warrants to the original purchaser that Glenayre products are free from defects in material or workmanship for a per iod of twenty-four m onths from the or iginal invoice date, subject to the provisions herein. Glenayre will repair or replace at its option, FOB our factory , free of char ge within one year f rom the date of shipment, any component, assem bly 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 impl ied and co vers on ly 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.

1.3.2 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 numb er of the unit. A description of the faul t 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 un it will be shipped collect.
Any repair service performed by G lenayre under this lim ited 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.
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Glenayre Document Number: 9110.00166 GL-T8xx1 Transmitter System Revision K: 08/30/99 SPECIFICATIONS

2 SPECIFICATIONS

Transmitter specifications are subject to change without notice. See Table 2-1, Specifica­tions, for various transmitter specifications. Listed specifications are applicable as of the
manual printing date.
Also refer to the exciter, power supply , power amplifier , and other related manuals for more 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 condition specification

RF Characteristics

RF output power tx model: frequency range
GL-T8521: 275 to 329 MHz GL-T8321: 275 to 329 MHz GL-T8331: 275 to 329 MHz GL-T8611: 138.0 to 175.0 MHz GL-T8411: 138.0 to 175.0 MHz GL-T8411EC 168.0 to 175.0 MHz GL-T8311: 138.0 to 175.0 MHz power measured directly at output of PA chassis, before any devices in the antenna network
RF output in watts 100 to 325 40 to 125 40 to 125 200 to 450 100 to 225 75 to 200 20 to 125

Physical Characteristics

Chassis dimensions overall standard EIA cabinet H x W x D inches : (cm)
5.25 x 19 x 16.5 : (13.3 x 48.3 x 16.5)
Weights by transmitter model PA chassis with exciter
GL-T8521 GL-T8321 GL-T8331 GL-T8611 GL-T8411 GL-T8311
32 lb (14.5 kg) 22 lb (10.0 kg) 22 lb (10.0 kg) 37 lb (16.8 kg) 16 lb (7.3 kg) 27 lb (12.3 kg)

Service Conditions

Elevation continuous operation at rated
power
Temperature operating -30 to +60 degrees C
storage -40 to +70 degrees C Temperature derating factor above 5000 ft (1525 m) 2 degrees C per 1000 ft (305 m) Humidity operating, noncondensing 0 to 95 percent
Copyright © 1999 Glenayre Page: 2-1
to 10,000 ft (3050 m) (see temperature der­ating factor)
GL-T8xx1 Transmitter System Glenayre Document Number: 9110.00166 SPECIFICATIONS Re vision K: 08/30/99
Table 2-1 Specifications (continued)
characteristic condition specification

Voltage Requirements and Power Consumption

Dc input voltage all models 28 V Ripple on dc input up to 120 Hz
over 120 Hz
Tx power consumption @ 28 Vdc GL-T8521
GL-T8321 GL-T8331 GL-T8611 GL-T8411 GL-T8411EC GL-T8311

Performance Specifications

Spurious output by model
GL-T8311 GL-T8411 GL-T8611 GL-T8321 GL-T8331 GL-T8521
Harmonic output by model
GL-T8311 GL-T8411 GL-T8611 GL-T8321 GL-T8331 GL-T8521
1.5Vp-p max 50 mVp-p max
1200 W 900 W 900 W 1500 W 1000 W 1000 W 450 W
-90 dBc (-80 dBc above 170 MHz)
-90 dBc
-90 dBc
-80 dBc
-80 dBc
-80 dBc
-90 dBc
-90 dBc
-90 dBc
-80 dBc
-80 dBc
-80 dBc
RF output stability all models 0.5 dB over temperature range Intermodulation of PA w/ circ. all models -40 dB Adjacent ch noise 4 level FSK all models (25 kHz s p acing) -70 dB Alternate ch noise 4 level FSK 25 kHz spacing
GL-T8311 GL-T8411 GL-T8611 GL-T8321 GL-T8331
GL-T8521 Frequency stability all models 0.005 parts per millio n Cabinet radiation all models 0.25 uW (maximum) FM hum and noise all models -40 dB in 15 kHz bandwidth Keyup / keydown time all models 10 ms to +1.5 / -1.0 dB of rated power
Page: 2-2 Copyright © 1999 Glenayre
-90 dBc
-100 dBc
-100 dBc
-100 dBc
-100 dBc
-100 dBc
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Glenayre Document Number: 9110.00166 GL-T8xx1 Transmitter System Revision K: 08/30/99 DESCRIPTION

3 DESCRIPTION

3.1 Conceptual 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 fro m the transmitter controller, which receives information from a control site. In a simulcasting environment, the control site may feed several paging sites at once. This transmitter is a computer controlled device. All user initiated operations are accomplished using the video display terminal connected through the exciter.

3.2 Physical Description

Refer to Figure 3-1, Transmitter Chassis Isometric Front View, which shows a front view of the PA chassis which is used in all models in this transmitter series. It is virtually impos­sible to identify the transmitter from the front view; refer to Figure 3-2, Typical PA Top Vi ews. Positive iden tification can only be done by removing the PA top cover since each transmitter has a unique PA compartment.

3.2.1 Mounting Provisions

The transmitter chassis is mounted in the rack by screws which are inserted int o the angle brackets on either side of the chassis. Access to the excit er and PA compartment is gained from the front; access to the metering board, fans, and I/O connections is gained from the rear.
3.2.1.1 PA and Exciter Assemblies
The transmitter chassis contains slide-out locations for the following:
• PA RF compartment (2 RU)
• exciter (1 RU)
Rear-mounted fans blow air across the PA heat sink and out the front.
The PA compartment and exciter are mounted on slides which allow them to be accessed or removed by loosening th e knurled thumb fasteners on either side of the assembly. Most exciter maintenance operations can be performed with the exciter mounted in the rack. Most PA maintenance can be performed with the transmitter chassis mounted in the rack.
3.2.1.2 Power Supply
The power supply is contained in a separate chassis which is mounted separately from the transmitter chassis. The power supply may be an ac p ower supply, which converts 50/60­Hz mains power to dc voltage for the transmitter, or it may be a dc-to-dc converter. Refer to the power supply manual for details.
Copyright © 1999 Glenayre Page: 3-1
GL-T8xx1 Transmitter System Glenayre Document Number: 9110.00166
g
DESCRIPTION Revision K: 08/30/99
3.2.1.3 Video Display Terminal
A video display terminal (VDT) is not necessarily 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 requ irements.
l

Figure 3-1 Transmitter Chassis Isometric Front View

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