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INSTALLATION AND SERVICE
Crescend Technologies
140 E. State Parkway
Schaumburg, IL 60173
Copyright Crescend Technologies
MANUAL
C7 SERIES
CONTINUOUS DUTY
POWER AMPLIFIER
RACK OF C7 AMPLIFIERS
December 20, 2015
Tel:
847 908 5400
Fax:
847 908 5408
Email:
sales@CrescendTech.com
Web Site: www.CrescendTech.com
040003A005 Rev 1
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Table of Contents
Summary of Contents for Crescend Technologies C7 SERIES
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Page 1: Power Amplifier
INSTALLATION AND SERVICE MANUAL C7 SERIES CONTINUOUS DUTY POWER AMPLIFIER RACK OF C7 AMPLIFIERS December 20, 2015 Crescend Technologies Tel: 847 908 5400 140 E. State Parkway Fax: 847 908 5408 Schaumburg, IL 60173 Email: sales@CrescendTech.com Web Site: www.CrescendTech.com Copyright Crescend Technologies... -
Page 2: Table Of Contents
Location of Status Indicators Initial Start-Up Section 4 Principles of Operation Introduction RF Input Signal RF Output Load Functional Description 4.4.1 Main RF Path 4.4.2 Loop Control 4.4.3 VSWR Protection 4.4.4 Thermal Protection Amplifier Cooling Copyright Crescend Technologies 040003A005 Rev 1... - Page 3 List of Illustrations Figure C7 Series Single Amplifier, Front View C7 Series Single Amplifier, Rear View FPR-5 Rack, Front Right View C7 Series Amplifiers in Rack, Rear View C7 Series Status Indicators, Front Panel Amplifier Test Setup diagram List of Tables Table...
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Page 4: General Description
1.2. PRODUCT DESCRIPTION The Crescend Technologies C7 Series of RF power amplifiers are designed for trunking and conventional repeater applications. Rack mountable and designed to accept a range of input powers for a given rated output power, each amplifier covers a broad range of frequencies without retuning. -
Page 5: Functional And Physical Specifications
Figure 1-2. C7 Series Single Amplifier, Rear View 1.3. FUNCTIONAL AND PHYSICAL SPECIFICATIONS Functional and physical specifications for the C7 Series amplifiers are listed in Tables 1-1 and 1-2. 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. -
Page 6: C7 Series Amplifier Functional Specifications
Table 1-1. C7 Series Amplifier Functional Specifications Frequency Range: See Table 1-2 (Range Set at Factory) Operating Voltage: +13.8 ±0.7 Vdc Current Consumption: See Table 1-2 Duty Cycle: 100% Power Input: See Table 1-2 (Range Set at Factory) Power Output (Single Carrier Operation):... -
Page 7: Frequency Ranges, Input/Output Power, Current
<-70 5-10 10-20 20-50 NOTES: Manufacturer’s Rated Output Power of this Equipment is for Single Carrier Operation. All specifications above apply at +13.8 ± 0.1 VDC operating voltage, ambient temperature of 25°C ± 5°C. Copyright Crescend Technologies 040003A005 Rev 1... -
Page 8: Installation
INTRODUCTION This section contains installation recommendations, unpacking, inspection, and installation instructions for the C7 Series of amplifiers. Carefully read all the material in this section prior to equipment unpacking or installation. Also read and review the operating procedures in Section 3 prior to installing the equipment. It is important that the licensee perform these tasks correctly and in good faith. -
Page 9: Installation Instructions
2. Keep DC wires as short as possible to minimize inductance induced voltage transients. 3. Size DC Wires properly to handle the load current to minimize voltage drop. Figure 2-1. FPR-5 Rack, Front Right View Copyright Crescend Technologies 040003A005 Rev 1... -
Page 10: Amplifier Summary Alarm And Power Cutback Control
Figure 2-2. C7 Series Amplifiers in Rack, Rear View 2.5. AMPLIFIER SUMMARY ALARM The summary alarm connections is made through a filtered feedthrough connector on the rear of the amplifier (see Table 2-1). Table 2-1. Summary Alarm Connection APPROPRIATE FUNCTION... -
Page 11: General Operating Information
The location and function of the C7 amplifier status indicators and is shown in Figure 3-1 and described in detail in Table 3-1. Figure 3-1. C7 Series Status Indicators, Front Panel Table 3-1. C7 Series Amplifier Status Indicators STATUS LED... -
Page 12: Initial Startup
4. Turn on external exciter/transceiver and apply RF input signal. The fan should turn on after approximately 3 seconds. 5. Turn off RF input signal. The fan should continue running, but turn off after approximately 6-8 seconds. Copyright Crescend Technologies 040003A005 Rev 1... -
Page 13: Principles Of Operation
PRINCIPLES OF OPERATION 4.1. INTRODUCTION This section contains principles of operation of the C7 Series of RF Power Amplifiers. 4.2. RF INPUT SIGNAL The amplifiers are set at the factory to work over different input power ranges. The available range of inputs for different frequency ranges may be found in Table 1-2. -
Page 14: Maintenance
Replace immediately with a similar to insure long term reliability. Heat is one of the biggest factors in reducing the reliability of your amplifier. Make sure the fan has access to cool and clean airflow within the rack. Copyright Crescend Technologies 040003A005 Rev 1... -
Page 15: Test Equipment Required For Test
Table 5-2 and the test setup is shown in Figure 5-1. Watt Meter Watt Meter Power Supply Signal Coupler Coupler Attenuator Spectrum Generator Amplifier 30 dB Analyzer Figure 5-1. Amplifier Test Setup Diagram Copyright Crescend Technologies 040003A005 Rev 1... -
Page 16: Troubleshooting
Replace fan if necessary Check ambient temperature (not to exceed spec - see Table 1-2) Copyright Crescend Technologies 040003A005 Rev 1... -
Page 17: Return For Service Procedure
To ensure safe shipment of the amplifier, it is recommended to use the packaging designed for the amplifier. The original packaging material is reusable. If it is not available, contact Crescend’s Customer Service Department for packing materials and information. Copyright Crescend Technologies 040003A005 Rev 1...
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