Motorola Solutions Inc. 99FT4100 Manual De Usuario

Spurious Rejection (ETSI)

75 dB

Audio Distortion

<3%

FM Hum and Noise 25 kHz/ 12.5 kHz

50 dB/ 45 dB

The Transmitter subsystem on the Transceiver board provides the transmitter functions for the station.
The Transmitter subsystem 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 transceiver board. Included in the transmitter subsystem
are:

Consists of a phase-locked loop and Voltage-Controlled Oscillator (VCO), generates a modulated
RF signal at the transmitter carrier frequency.

Allows the controller section to turn on/off the Exciter RF input signal which greatly reduces signal
leakage when the transmitter is de-keyed.

Converts the analog transmitter status signals to the digital format for transfer, upon request, to the
controller section of the Transceiver board.

Table 13: Specifications of Transmitter Exciter Subsystem

Frequency Range

400 – 527 MHz

Electronic Bandwidth

Full Bandwidth

Output Power

10 W

Harmonics

-76 dBc

The Station Control Subsystem is described in this section. A general description, identification of
controls, indicators, and inputs/outputs, a functional block diagram, and functional theory of operation
are provided.

The Controller circuitry performs the digital signal processing, data formatting and audio routing for the
station and provides the external interfaces to the rest of the site.

The Controller section consists of seven main ICs. These are:

MN003557A01-AA

Chapter 3:  SLR 1000 Transceiver Board

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