User Guide

CC Technical Documentation Troubleshooting - GPS
RM-11
Issue 1 02/2004 ©2004 Nokia Corporation Confidential Page 3
Troubleshooting - Global Positioning System (GPS) Engine
The RM-11 handset supports 800 AMPS and 800 CDMA / 1900 CDMA + GPS with
IS 2000 capability. The RM-11 engine supports CDMA and GPS functionality for
Enhanced 911 (E911) services.
GPS circuitry utilizes RF signals from satellites stationed in geosynchronous orbit to
determine the 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
Figure 1: GPS general block diagram
GPS RF Schematic
Figure 2: GPS RF schematic
AD
C
Synthesiser
TRF510
1
LNA
FilterFilter
4
AGC
Amp
Xtal
16.368MHz
IF = 4.092MHz
Ref
Clk
Rx
Data
Out
GPS
Baseband
Cellular Baseband
GPS RF
RF input GPS RF chip (N001)
Filter 2 (Z002)
Filter 1 (Z001)
Circuits Located on Bottom Layer
Circuits Located on Top Layer