Nokia NPM-2NX Troubleshooting Manual page 32

NPM-2NX
Troubleshooting
2) Set phone to TDMA mode and select RF Test UI in Phoenix (Maintenance => Testing
=> RF Test).
3) Make sure that signal generator allows phone TX power going to its output. Use low
power level, for example 10. Set channel to 380 and select "Write Init".
4) Set spectrum analyzer settings as following:
- Center frequency: 268.08 MHz, Span: 200 kHz
- RBW: 3 kHz, reference level: 0 dBm
5) Connect spectrum analyzer probe on the inductor L818 and record RX VHF VCO signal
level and frequency. Signal level should be around -25 dBm and frequency 268.08 MHz.
6) Set spectrum analyzer settings as following:
- Center frequency: 2030.88 MHz, Span: 200 kHz
- RBW: 3 kHz, reference level: 10 dBm
7) Connect spectrum analyzer probe to VCO output pad and record UHF VCO signal level
and frequency. Signal level should be around -5 dBm and frequency 2030.88 MHz.
8) Repeat measurement for channels 991 and 799.
Step 3. RX chain checking
1) Set signal generator frequency to 881.4091125 and level to -50 dBm.
2) Set phone to TDMA mode and select RF Test UI in Phoenix (Maintenance => Testing
=> RF Test).
3) Make sure that signal generator allows phone TX power going to its output. Use low
Page 32 ãNokia Corporation
CCS Technical Documentation
Issue 1 07/02