Measuring Analogue Rx I/Q Signals Using Oscilloscope; Fig 10 Signal Amplitudes - Nokia NPL-4 Series Troubleshooting Instructions

NPL-4/5/RM-104
Troubleshooting Instructions

Measuring analogue RX I/Q signals using oscilloscope

Measuring with an oscilloscope on "RXIINN", (R421) or "RXQINN", (R423) is recom-
mended only if RSSI reading does not provide enough information. Input level = -60dBm.
- Start Phoenix Service Software and open FBUS connection.
- Select → Scan Product (Ctrl-R)
Wait until phone information is shown in the lower right corner of the screen.
- Set operating mode to "local mode"
- Select → Testing → RF Controls
Wait until the RF Controls window is popped up.
- Select → Band →GSM 850 or GSM 900 or GSM1800 or GSM1900
Active unit → RX
Operation mode → continuous
RX/TX Channel → 190 or 37 or 700 or 661
AGC → 12
Following diagram should be displayed on an oscilloscope' s screen if the GSM 900
receiver is working properly:
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Figure 10: Signal Amplitudes
Nokia Customer Care
Issue 2 05/05