Motorola Solutions Inc. 99FT4100 Manual De Usuario

The Transceiver board covers the following bands with unique models:

• 400 – 527 MHz

The Transceiver board includes the receiver circuitry for the station. A cable connects the board
connector to an N-type connector on the upper left hand side of the repeater.

See 

Figure 10: SLR 1000 Repeater Transceiver Board Connector Locations on page 45

 for the

location of this connector. The receiver section performs highly-selective bandpass filtering and dual
down-conversion of the desired RF signal. A custom Receiver IC then performs an analog-to-digital
conversion of the desired received signal and outputs the digitized signal to the controller section via a
serial synchronous interface. Included in the receiver section is:

Consists of a phase-locked loop and Voltage-Controlled Oscillator (VCO), generates the first LO
injection signal.

Provides bandpass filtering of the station Receiver RF input.

Performs filtering, amplification, and the first down conversion of the Receiver RF signal.

Consists of receiver-specific parts of a transceiver IC which performs the second down conversion,
filtering, amplification, and analog-to-digital conversion of the receive signal.

Converts analog Receiver status signals to digital format for transfer to the controller circuitry
located on the Transceiver board.

Table 12: Specifications of Receiver Subsystem

Frequency Bands

400 – 527 MHz

Selectivity 25 kHz/ 12.5 kHz (TIA603D)

75 dB/ 50 dB

Selectivity 25 kHz/ 12.5 kHz (TIA603)

75 dB/ 65 dB

Selectivity 25 kHz/ 12.5 kHz (ETSI)

70 dB/ 63 dB

Sensitivity (12 dB SINAD)

0.3 uV

Sensitivity (5% BER)

0.3 uV

Intermodulation Rejection (TIA603D)

80 dB

Intermodulation Rejection (ETSI)

70 dB

Spurious Rejection (TIA603D)

85 dB

MN003557A01-AA
Chapter 3:  SLR 1000 Transceiver Board

46  

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