User Guide

CCS Technical Documentation Troubleshooting - GPS

RH-27

Troubleshooting - Global Positioning System (GPS) Engine

The RH-27 handset supports 800 Amps and 800 CDMA / 1900 CDMA + GPS with IS 2000

capability. The RH-27 engine supports CDMA and GPS functionality for Enhanced 911

(E911) services.

GPS circuitry utilizes RF signals from satellites stationed in geosynchronous orbit to

determine latitude and longitude of the handset. The GPS circuitry and the cellular

engine (CE) circuitry are completely separate in the handset. The GPS circuitry is located

almost exclusively on the secondary side of the PWB, underneath the display module.

GPS General Block Diagram

GPS RF Schematic

ADC

Synthesiser

TRF5101

LNA

FilterFilter

AGC

Amp

Xtal

16.368MHz

IF = 4.092MHz

Ref Clk

Rx Data

Out

GPS

Baseband

Cellular Baseband

GPS RF

F Input

Filter 1 (Z001)

Filter 2 (Z002)

GPS RF Chip (N001)

Circuits located on Bottom Layer

Circuits located on Top Layer