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2-18 ApexPro™ 2001989-351A

Equipment Overview

The RX network is directly connected by a network crossover cable to an ApexPro

Telemetry System. The RX network should not be tied to any other network.

rcrsysblk

Receiver System Block Diagram

Receiver subsystem (backplane)

The subsystem provides an interface between the quad receiver modules and the

telemetry software running on the ApexPro Telemetry System connected via 10BaseT

Ethernet. The subsystem accommodates up to four quad receiver modules. The

subsystem performs the initial amplification and filtering necessary on the RF input

signals from the transmitter.

Quad receiver modules

The quad receiver module receives the GMSK modulated RF signals from the

transmitter through the receiver subsystem (backplane). The RF signals are mixed to

an intermediate frequency, filtered, and mixed again to baseband and re-filtered. The

baseband signal is separated into its in-phase and quadrature components then

sampled. The DSP takes the samples, demodulates, corrects, and decodes packets of

TLINK data. The information is passed on to the receiver subsystem for further

processing and transport over Ethernet. Each module has four functionally identical

receivers.

GE ApexPro Technical Manual

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