User's Manual

APPLICANT: MOTOROLA EQUIPMENT TYPE: ABZ89FC5819
User / Operational Manual
Functional Description / Operation of Modules (Draft)
EXHIBIT D1-6
Exciter Overview
The Exciter Modules (in conjunction with the Power Amplifier Module) provides the transmitter functions for the
station. Contained within a metal clamshell housing, the Exciter board generates a low-level modulated Radio
Frequency (RF) signal which is input to the power amplifier module for further amplification and output to the
transmit antenna. The Exciter Modules interfaces directly with the Station Control Module (SCM), which provides
control signals and monitoring, and routes transmit audio to the Exciter.
The RF carrier is generated by a frequency synthesizer consisting of synthesizer circuitry and Voltage-Controlled
Oscillator (VCO) circuitry. Exciter module control signals, monitoring, and audio processing are handled by the
Station Control Module (SCM). The Exciter Modules differ only in the range of operation. Unless otherwise noted,
the information provided in this section applies to all models.
The Exciter board contains the following circuitry:
• 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 SCM to turn on/off the Exciter RF output signal to the power amplifier
module
• Analog to Digital Converter (ADC) Converter Circuitry – converts the analog Exciter status signals to the
digital format for transfer, upon request, to the SCM
• Local Power Supply Regulation/Filtering – accepts +8V, +10V and +14.2V inputs and provides +5V, +10V,
and +12V operating voltages
Input and Output Connections - The following shows the Exciter module input and output external connections.
Specifications of Exciter Module
Parameter Specification
Frequency Ranges 851–870 MHz (800 MHz) and 935–941 MHz (900 MHz)
Electronic Bandwidth Full Bandwidth
Output Power 13–18 dBm (800 MHz), 14 – 18 dBm (900 MHz)
Current Draw (Maximum) 0.05A from 14.2 VDC supply
0.15A from 10 VDC supply
0.2A from 8 VDC supply
Harmonics -20 dBc