Receiver Diagnostic Using Signal Tracing And Call Box - Nokia 2255 Manual

2255 (RM-97)
RF Description and Troubleshooting
Cell I Q Output
dBm
Trace A
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
Centre: 300 kHz
Res BW: 3 kHz
5/5/2004 3:29:30 PM

Receiver Diagnostic using Signal Tracing and Call Box

Use 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 box
8960 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.
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1
Atten: 10 dB
Vid BW: 3 kHz
CellIQ.spt
Figure 25: Receiver IQ level on CDMA Cell band
©2005 Nokia Corporation
Nokia Customer Care
Span: 200 kHz
Sweep: 100 ms
HP8595E
Company Confidential
1
Trace A
302 kHz
-21.2500 dBm
ISSUE 1 10/2005