User's Manual

Copyright Crescend Technologies 2 Rev B
GENERAL DESCRIPTION
Warning! Changes or modifications not expressly approved by the party
responsible for compliance could void the users’ authority to operate the
equipment.
Compliance
This device complies with part 15 of the FCC rules. Operation is
subject to the following two conditions: (1) This device may not cause harmful
interference, and (2) this device must accept any interference received, including
interference that may cause undesired operation.
1.1. INTRODUCTION
This manual contains information and procedures for installation, operation, and general
maintenance of Crescend’s VHF Continuous Duty Power Amplifier.
1.2. PRODUCT DESCRIPTION
The Crescend Technologies VHF 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, the amplifier covers a broad range of
frequencies. 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.
The amplifier front panel includes status LED indicators for DC and Alarm conditions. RF
Input, RF Output, DC, summary alarm and power cutback connections are found on the
back of the amplifier. A fan is used to cool the amplifier.
Table 1-1. 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: 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