User's Manual
Table Of Contents
- Foreword
- General Safety and Installation Standards and Guidelines
- MOTOTRBO SLR 5000 Series Repeater Supplemental Safety and Installation Requirements
- Environmental Information
- Document History
- Contents
- List of Figures
- List of Tables
- List of Procedures
- Related Publications
- Summary of Bands Available
- Commercial Warranty
- SLR 5000 Series Repeater
- SLR 5000 Series Satellite Receiver
- SLR 5000 Series Modem
- SLR 5000 Series Power Amplifier
- SLR 5000 Series Power Supply
- SLR 5000 Series Front Panel
- SLR 5000 Series Back Panel
- SLR 5000 Series Test Equipment And Service Aids
- SLR 5000 Series Performance Check or Testing
- SLR 5000 Series Programming and Tuning
- SLR 5000 Series Maintenance and Disassembly/Reassembly
Parameter Specifications
VHF UHF
Spurious Rejection (TIA603D) 95 dB
Spurious Rejection (ETSI) 90 dB
Audio Distortion <1%
FM Hum and Noise 25 kHz/12.5 kHz -50 dB/-45 dB
3.3
Transmitter Exciter Subsystem
The Exciter Subsystem in the Modem Module (in conjunction with the Power Amplifier Module)
provides the transmitter functions for the station. The Exciter circuitry generates a low-level modulated
Radio Frequency (RF) signal which is input to the Power Amplifier (PA) module for further amplification
and output to the transmit antenna. A coaxial cable is used to connect the Tx exciter output to the PA
module. See Figure 8: Modem Module Connector Locations on page 52 for the exact location of this
connector. The Exciter Module interfaces directly with the controller section, which provides control
signals and monitoring, and routes transmit data to the Exciter.
The RF carrier is generated by a frequency synthesizer consisting of synthesizer circuitry and Voltage-
Controlled Oscillator (VCO) circuitry. Exciter circuit control signals, monitoring, and audio processing
are handled by the controller section of the Modem Module. The power leveling circuitry of the
transmitter system is located in the Power Amplifier Module and passed onto the exciter stages
through the PA-Modem interface flex cable. See Figure 8: Modem Module Connector Locations on
page 52 for the location. Included in the exciter section are:
• Frequency Synthesizer Circuitry – Consists of a phase-locked loop and Voltage-Controlled
Oscillator (VCO), generates a modulated RF signal at the transmitter carrier frequency.
• RF Isolation Switch – Allows the controller section to turn on/off the Exciter RF input signal which
greatly reduces the signal supplied to the Power Amplifier module.
• Analog to Digital Converter (ADC) Circuitry – Converts the analog Exciter status signals to the
digital format for transfer, upon request, to the controller section of the Modem Module.
• Low Level Amplifiers – Amplify and buffer the modulated RF signal from the VCO for delivery to the
Power Amplifier Module.
3.3.1
Specifications
Table 12: Specifications of Transmitter Exciter Subsystem
Parameter Specifications
VHF UHF
Frequency Range 136–174 MHz UHF R1, 400–470 MHz
UHF R2, 450–527 MHz
Electronic Bandwidth Full Bandwidth
Output Power 6 W 6.2 W
Harmonics -20 dBc
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Chapter 3: SLR 5000 Series Modem
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