2255 (RM-97)RF Description and Troubleshooting Nokia Customer CarePage 28 ©2005 Nokia Corporation Company Confidential ISSUE 1 10/2005Figure 25: Receiver IQ level on CDMA Cell bandReceiver Diagnostic using Signal Tracing and Call BoxUse the following steps to trace a receiver signal. Refer to diagrams above.1. Inject an external signal source of –25dBm into the RF input. An Agilent call box8960 is recommended.2. Press the Call Setup button, press the Active Cell soft button, and select CW.Inject a CW signal for Cell 881.82MHz or 881.22 (CH-384 offset by 300KHz) at a fixed–75dBm power level.dBm0-10-20-30-40-50-60-70-80-90-100Cell I Q OutputTrace ACentre: 300 kHz Span: 200 kHzAtten: 10 dBRes BW: 3 kHz Vid BW: 3 kHz Sweep: 100 ms5/5/2004 3:29:30 PM HP8595ECellIQ.spt11 Trace A302 kHz-21.2500 dBm
