Crescend Technologies VB0001 Operations Manual

INSTALLATION & SERVICE

MANUAL

MODEL H100

CONTINUOUS DUTY

POWER AMPLIFIER

Crescend Technologies
2255 Lois Drive, Suite 1
Rolling Meadows, IL 60008

450-470 MHz

May 17, 2000

Tel: [phone]
Fax: [phone]
Web Site: www.crescendtech.com

Par.

No.

1-1 Introduction
1-2 General Description
1-3 Functional and Physical Specifications
1-4 Equipment Changes
1-5 Ordering Information

TABLE OF CONTENTS

Section 1

General Description

Section 2

Installation

Page

No.

4
4
4
4
4

2-1 Introduction
2-2 Electrical Service Recommendations
2-3 Unpacking and Inspection
2-4 Installation Instructions

2-5

3-1 Introduction
3-2

3-3
3-4 Variable Input Switch 9

4-1 Introduction
4-2 RF Input Signal
4-3 RF Output Load
4-4 Functional Description
4-5 H100 Amplifier Module
4-5.1 Main Amplifier

Amplifier Module Alarm and Control
Connector

Section 3

Operating Instructions

Location and Function of Amplifier
Module Control and Indicators

Initial Start-Up and Operating
Procedures

Section 4

Principles of Operation

6
6
6
6

7

8
8

8

10
10
10
10
10
10

4-5.2 Loop Control 11
4-5.3 Amplifier Monitoring 11
4-5.4 Amplifier Module Cooling 11
4-6 Power Distribution 11

Rev 1. 2

TABLE OF CONTENTS (Continued)

Section 5

Maintenance

5-1 Introduction 12
5-2 Periodic Maintenance 12
5-3 Test Equipment Required for Test 12
5-4 Cleaning air Inlets/Outlets
5-5 Performance Test
5-5.1 Amplifier Performance Test
5-6 Field Replaceable Parts and Modules 14
5-6.1 H100 Power Amplifier Module 14
5-6.2 Cooling Fans 14
5-6.3 Fuse 15

Section 6

Troubleshooting

13
13
13

6-1 Introduction
6-2 Troubleshooting
6-3 Return for Service Procedure
6-3.1 Obtaining an RMA
6-3.2 Repackaging for Shipme nt

16
16
16
16
16

Figure LIST OF ILLUSTRATIONS Page

4-1 Variable Input Switch 10
4-2 H100 Block Diagram 11
5-1 Amplifier Test Setup diagram 15

LIST OF TABLES

Table Page

1-1 Major Amplifier Components 4
1-2 H100 Amplifier Functional Specifications 5
1-3 Load Mismatch Tolerance 5

2-1

Amplifier Module Alarm and Control
Connections

7

3-1 H100 Amplifier Module Control and Indicators 8
5-1 Periodic Maintenance 12
5-2 Test Equipment Required 12
6-1 Troubleshooting 16

Rev 1. 3

1. GENERAL DESCRIPTION

1.1. INTRODUCTION

This manual contains information and procedures for installation, operation, of Crescend’s H100
Continuous Duty Power Amplifier. The manual is organized into five sections as follows:

Section 1. General Description
Section 2. Installation
Section 3. Operating Instructions
Section 4. Principles of Operation
Section 5. Maintenance
Section 6: Troubleshooting

1.2. GENERAL DESCRIPTION

The H100amplifier is designed for trunking and conventional repeater applications requiring high duty
cycles. The H100 amplifier operates from RF power sources of 250 milliwatts up to 25 watts. The

amplifier consists of an input attenuator, a predriver amplifier, a microprocessor circuit control, and two
stages of amplification followed by a 7-pole distributed low-pass filter and associated control circuitry.
The H100 amplifier has a microprocessor control board that maintains a constant output power under
varying signal input and output load conditions. A system functional block diagram of the Model H100
amplifier is contained in section 4 of this manual.

1.3. FUNCTIONAL AND PHYSICAL SPECIFICATIONS

Functional and physical specifications for the H100 amplifier are listed in tables 1-2 and 1-3.

1.4. EQUIPMENT CHANGES

Crescend Technologies, Inc. reserves the right to make minor changes without notice, including but
not necessarily limited to component substitution and circuitry changes. Such changes may or may not
be incorporated in this manual, although it is our intention to keep each manual as up-to-date as
possible. To that end, we ask that you, our customer, share with us information acquired in field
situations which might be of assistance to another user. If you share it with us, we’ll pass it around.

1.5. ORDERING INFORMATION

Table 1-1 following gives the part numbers and descriptions to be used when ordering either an entire
amplifier or replacement fans.

Table 1-1. Major Amplifier Components

MODEL NUMBER DESCRIPTION

H100 250 mW – 25 W 450-470 MHz Amplifier
800-00889-001 Fan Assembly

Rev 1. 4

Table 1-2. H100 Amplifier Functiona l Specifications

Frequency Range: 450-470 MHz.
Operating Voltage: +28 Vdc (±1.0 Vdc)
Current Draw 9 Amperes Typical; 11 Amperes Maximum
Duty Cycle: 100%
Power Input: 250 mW - 25 W.
Power Output: 100 Watts
Spurious & Harmonics. -70 dBc (Minimum)
Input/Output Impedance 50 ohms (Nominal)
Load VSWR Tolerance See Chart
Input/Output Connector: Type N Female
Vertical Mounting: 10.47”
Horizontal Mounting: 3.38’
Depth. 17.0”
Weight: 20 Pounds Nominal
Cooling Method: Fan Forced Air Over Heatsink
Operating Temp. Range: 0 °C. to +60 °C.
Storage & Transport: -10 °C. to +70 °C.
Humidity: 80% at +40 “C. (Non condensing)
Altitude: 10,000 Feet Maximum
OPTIONS

INDICATORS

DC PWR ON, LOW OUTPUT, LOW INPUT,
HIGH INPUT, HIGH VSWR, OVER TEMP.,

Remote Control/Display Panel

NOTES: Manufacturer’s Rated Output Power of this Equipment is for Single Carrier

Operation.

All specifications apply at +28 Vdc operating voltage.

Table 1-3. Load Mismatch Tolerance

Full Power, Sustained Operation 2:1 Maximum

L.E.D. POWER BAR METER

CONTROLS

PWR CONTROL (-10 dB)

Sustained Operation at Reduced Power 3:1
Microprocessor Shutdown 10:1

Rev 1. 5