User Guide

Results

By measuring with an oscilloscope at RXIP or RXQP on a working GSM1900 receiver this picture should be

seen. Signal amplitude 108 mVp-p. DC offset 1.0V.

Figure 60 1900 RX I/Q signal waveform

Measurement points in the receiver

Figure 61 RX measurements point of the control voltages to FEM N7700

RH-116; RH-117

RF Troubleshooting Instructions

Issue 1 COMPANY CONFIDENTIAL Page 4 –31