User Guide

RM-11

Troubleshooting - RF (Part 2) CC Technical Documentation

RX Troubleshooting

Figure 22: RM-11 RX system block diagram

Receiver Schematic

• An external signal source is injected to the RF input. The signal is then traced

throughout the receiver chains.

• Agilent call box 8960 is recommended. Press the Call Setup button, then the

Active Cell soft button, and then select CW.

• Inject a CW signal for PCS (1960MHz) or Cell/AMPS (881.52MHz) at a fixed

25dBm power level.

The numbers below indicate the general RF signal flow and probing locations. More

details are shown in the following pages.

Figure 23: RF signal flow and probing locations

Cell

LNA

PCS

LNA

Cell

RFA

PCS

RFA

AMPS

CDMA

VGA

RX IC "ALFRED"

LOA

UHF

VCO

Batman RX Down-converter

DEMOD

ADC

BBFIL/BBAMP

AMPS

FILTER

CDMA

FILTER

DIPLEX FILTER

PCS RF FILTER

CELL RF FILTER

CELL DUPLEX FILTER

PCS DUPLEX FILTER