Crescend Technologies C7 SERIES Manuel
Copyright Crescend Technologies 040003A005 Rev 1
INSTALLATION AND SERVICE
MANUAL
C7 SERIES
CONTINUOUS DUTY
POWER AMPLIFIER
RACK OF C7 AMPLIFIERS
December
20, 2015
Crescend Technologies
140 E. State Parkway
Schaumburg, IL 60173
Tel: 847 908 5400
Fax: 847 908 5408
Email: sales@CrescendTech.com
Web Site: www.CrescendTech.com
Copyright Crescend Technologies 2 040003A005 Rev 1
TABLE OF CONTENTS
Section 1
Par. No. General Description Page No.
1.1 Introduction 4
1.2 Product Description 4
1.3 Functional and Physical Specifications 5
1.4 Equipment Changes 5
Section 2
Installation
2.1 Introduction 8
2.2 Electrical Service Recommendations 8
2.3 Unpacking and Inspection 8
2.4 Installation Instructions 9
2.5 Amplifier Summary Alarm and Power Cutback Control 10
Section 3
General Operating Information
3.1 Introduction 11
3.2 Location of Status Indicators 11
3.3 Initial Start-Up 12
Section 4
Principles of Operation
4.1 Introduction 13
4.2 RF Input Signal 13
4.3 RF Output Load 13
4.4 Functional Description 13
4.4.1 Main RF Path 13
4.4.2 Loop Control 13
4.4.3 VSWR Protection 13
4.4.4 Thermal Protection 13
4.5 Amplifier Cooling 13
Copyright Crescend Technologies 3 040003A005 Rev 1
TABLE OF CONTENTS (Continued)
Section 5
Par. No. Maintenance Page No.
5.1 Introduction 14
5.2 Periodic Maintenance 14
5.3 Cleaning Air Inlets/Outlets 14
5.4 Test Equipment Required for Test 15
5.5 Performance Test 15
Section 6
Troubleshooting
6.1 Introduction 16
6.2 Troubleshooting 16
6.3 Return for Service Procedure 17
6.3.1 Obtaining an RMA 17
6.3.2 Repackaging for Shipment 17
Figure List of Illustrations
1-1 C7 Series Single Amplifier, Front View 4
1-2 C7 Series Single Amplifier, Rear View 5
2-1 FPR-5 Rack, Front Right View 9
2-2 C7 Series Amplifiers in Rack, Rear View 10
3-1 C7 Series Status Indicators, Front Panel 11
5-1 Amplifier Test Setup diagram 15
Table List of Tables
1-1 C7 Series Amplifier Functional Specifications 6
1-2 Frequency Ranges, Input/Output Power, Current,
Spurious and Harmonics 7
2-1 Summary Alarm Connection 10
3-1 C7 Series Amplifier Status Indicators 11
5-1 Periodic Maintenance 14
5-2 Test Equipment Required 15
6-1 Troubleshooting 16
Copyright Crescend Technologies 4 040003A005 Rev 1
1. GENERAL DESCRIPTION
1.1. INTRODUCTION
This manual contains information and procedures for installation, operation, and
maintenance of Crescend’s C7 Series Continuous Duty Power Amplifier. The manual is
organized into six 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. 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. Closed loop power control is used to maintain a constant
output power under varying voltage, signal input, frequency and output load conditions.
Several design features work to protect the amplifier under adverse conditions.
Having the same features as our popular Crescend C5 models, the design of the C7
amplifiers allows for up to 5 amplifiers in 4U of rack space. Designed to be fully modular
and space efficient, the 5-pack series also provides continuous duty operation. Rack FPR-5
sold separately.
The C7 front panel (Figure 1-1) includes status LED indicators for DC and Alarm
conditions. RF Input, RF Output, DC and summary alarm connections are found on the
back of the amplifier (Figure 1-2).
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Figure 1-1. C7 Series Single Amplifier, Front View
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.
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 information with us acquired in field situations, which might be of assistance to
another user.
Copyright Crescend Technologies 6 040003A005 Rev 1
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): See Table 1-2 (Range Set at Factory)
Input Return Loss: -10 dB (Maximum)
Spurious & Harmonics: See Table 1-2
Input/Output Impedance: 50 Ohms (Nominal)
Load VSWR Tolerance: VSWR Protected above 2.5:1 (Nominal)
Input/Output Connector: Type N Female
Vertical Mounting: 7.0 in
Horizontal Mounting: 3.4 in
Depth: 19.0 in
Weight: 10 lbs (4.6 kg) (Nominal)
Cooling Method: Fan Forced Air Over Heat Sink
Operating Temp. Range: -30 °C to +60 °C
Storage & Transport: -40 °C to +70 °C
Humidity: 80% at +40 °C (Non-Condensing)
Altitude: 10,000 Feet (Maximum)
Front Panel Display: INDICATORS
DC ON (Green), LOW OUTPUT (Red),
HIGH VSWR (Red), OVER TEMP (Red)
Alarm and Pins: SUMMARY ALARM
Summary of Low Output, High VSWR and
Over Temp Alarms
Copyright Crescend Technologies 7 040003A005 Rev 1
Table 1-2. Frequency Ranges, Input/Output Power, Current, Spurious and Harmonics
Input Power
Range (W) Rated Output
Power (W)
Typ
Current
(A)
Max
Current
(A)
Spurious and
Harmonics
(dBc)
2-5
5-10
10-20
20-50
100 (P10) 20 23 <-65
0.1-0.2
0.2-0.5
0.5-1
1-2
2-5
5-10
10-20
50 (P5) 11 12 <-70
0.1-0.2
0.2-0.5
0.5-1
1-2
2-5
5-10
10-20
20-50
100 (P10)
110 (P11)
150 (P15)
18
22
26
23
25
28
<-65
<-65
<-67
0.1-0.2
0.2-0.5
0.5-1
1-2
2-5
5-10
10-20
20-50
50 (P5)
100 (P10) 11
21 12
25 <-70
<-70
0.1-0.2
0.2-0.5
0.5-1
1-2
2-5
5-10
10-20
20-50
80 (P8) 20 24 <-70
0.1-0.2
0.2-0.5
0.5-1
1-2
2-5
5-10
10-20
20-50
80 (P8) 20 24 <-70
Frequency
Range (MHz)
30-36 (AA)
36-42 (AB)
42-50 (AC)
136-174 (DE)
136-144 (DA)
136-174 (DB)
152-162 (EA)
162-174 (EB)
360-400 (UXL)
450-512 (UH)
764-870 (JK)
928-942 (L)
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 8 040003A005 Rev 1
2. INSTALLATION
2.1. 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. If applicable, carefully read Parts 73 and 74 of the Federal
Communications Commission (FCC) rules to determine how they apply to your installation.
2.2. ELECTRICAL SERVICE RECOMMENDATIONS
Crescend Technologies recommends that proper AC line conditioning and surge
suppression be provided on the primary AC input to the +13.8 VDC power source. All
electrical service should be installed in accordance with the National Electrical Code, any
applicable state or local codes, and good engineering practice. Special consideration
should be given to lightning protection of all systems in view of the vulnerability of most
transmitter sites to lightning. Lightning arrestors are recommended in the service entrance.
Straight, short ground runs are recommended. The electrical service must be well
grounded. Each amplifier should have its own circuit breaker.
2.3. UNPACKING AND INSPECTION
This equipment has been operated, tested and calibrated at the factory. Only in the event
of severe shocks or other mistreatment should any substantial readjustment be required.
Carefully open the container(s) and remove the amplifier module(s). Retain all packing
material that can be reassembled in the event that the unit must be returned to the factory.
CAUTION: Exercise care in handling equipment during inspection to
prevent damage caused by rough or careless handling.
Visually inspect the amplifier module for damage that may have occurred during shipment.
Check for evidence of water damage, bent or warped chassis, loose screws or nuts, or
extraneous packing material in the connector or fans. Inspect the rear panel connector for
bent connector pins. If the equipment is damaged, a claim should be filed with the carrier
once the extent of any damage is assessed. We cannot stress too strongly the importance
of IMMEDIATE careful inspection of the equipment and the subsequent IMMEDIATE filing
of the necessary claims against the carrier if necessary. If possible, inspect the equipment
in the presence of the delivery person. If the equipment is damaged, the carrier is your first
area of recourse. If the equipment is damaged and must be returned to the factory, write or
phone for a return authorization. Crescend may not accept returns without a return
authorization. Claims for loss or damage may not be withheld from any payment to
Crescend, nor may any payment due be withheld pending the outcome thereof. WE
CANNOT GUARANTEE THE FREIGHT CARRIER’S PERFORMANCE.
Copyright Crescend Technologies 9 040003A005 Rev 1
2.4. INSTALLATION INSTRUCTIONS
The C7 amplifier is designed for installation in a rack (Figures 2-1 and 2-2) that permits
access to the rear of the rack for connection of DC power, RF, and monitor cable. The
amplifier must have a minimum of 3 inches of open space in front of and behind the rear fan
to allow adequate ventilation.
To install the amplifier proceed as follows:
1. Install FPR-5 subrack into a 19 inch equipment rack using the front and rear
mounting points
2. Install amplifier in subrack and secure in place with two thumbscrews on front
panel.
3. Connect a 50 ohm antenna cable and load to the RF OUT connector on rear of
amplifier.
4. Connect the transceiver/exciter output to RF IN connector on rear of amplifier.
5. If monitoring of PA is desired, connect alarm cable to “ALARM” pin on rear of
amplifier module. See section 2.5 for more details.
6. Measure primary DC input voltage. DC input voltage should be +13.8 +/- 0.1VDC.
Turn off DC voltage.
WARNING: Turn off external primary DC power before connecting DC power cables.
7. Connect positive primary power wire (+13.8VDC) to terminal marked +13.8VDC
and negative primary power wire to GND terminal on rear of amplifier.
8. Check your work before applying DC voltage to the system. Make certain all
connections are tight and the DC wires are going to the correct terminals.
9. Refer to Section 3 for initial start-up procedures.
NOTE:
1. Make sure power supply DC is well filtered and well behaved with minimal
voltage overshoot.
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 10 040003A005 Rev 1
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
PIN FUNCTION DESCRIPTION CONDITION APPROPRIATE
LOAD
Alarm: < 1 VDC
Normal Operation: > 8 VDC
(up to Vcc)
> 10 kOhm,
< 100pF
ALARM Summary
Alarm
Indicates when:
1. The output power is low,
or
2. VSWR cutback is
activated, or
3. Thermal cutback is
activated
Alarm: < 1 VDC
Normal Operation: 4 - 5 VDC
1.8 kOhm between pin and ground,
<500 pF
(TTL compatible)
Table des matières
