Installation Manual

3.3
Transmitter Subsystem
The Transmitter subsystem on the SLR 1000 Repeater 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.
A frequency synthesizer consisting of synthesizer circuitry and Voltage-Controlled Oscillator (VCO)
circuitry generates the RF carrier. The Controller section of the transceiver board handles the exciter
circuit control signals, monitoring, and audio processing. Included in the transmitter subsystem 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 signal
leakage when the transmitter is de-keyed.
Analog to Digital Converter (ADC) Circuitry
Converts the analog transmitter status signals to the digital format for transfer, upon request, to the
controller section of the Transceiver board.
Return to Process
SLR 1000 Transceiver Board on page 49
Related Links
Transmitter Subsystem Specifications
on page 53
3.3.1
Transmitter Subsystem Specifications
The following contains the SLR 1000 Repeater transmitter subsystem Radio Frequency (RF) operating
specifications.
Table 13: SLR 1000 Repeater Specifications of the Transmitter Exciter Subsystem
Parameter Specifications
VHF UHF
Frequency Range 136–174 MHz 400–512 MHz
Electronic Bandwidth Full Bandwidth
Output Power 10 W
Harmonics -76 dBc
Return to Process
Transmitter Subsystem on page
53
MN003557A01-AF
Chapter 3: SLR 1000 Transceiver Board
53