Nokia NPM-6 Series Troubleshooting Instructions page 15

CCS Technical Documentation
- Set Rx/Tx channel to 37 on EGSM900 band, 700 on GSM1800 band or 661 on
GSM1900 (Defaults)
Apply 942.46771 MHz (channel 37 + 67.710 kHz offset), 1842.86771 MHz (channel 700
+ 67.710 kHz offset) or 1960.06771 MHz (channel 661 + 67.71 kHz) –90 dBm signal to
the RF-connector (remember to compensate for cable attenuation).
Measuring with an oscilloscope on "RXI" or "RXQ" following screens should be seen on a
working EGSM900 , GSM1800 or GSM1900 receiver:
Figure 8:
Figure 8, "RX I/Q signal ,burst mode, input level –90dBm.," on page 15: Receiver I or Q
burst mode signal (channel 37) measured from testpoint RXI or RXQ with 942.467 MHz
signal, input level –90dBm at RF-connector.
Correct signal amplitudes approximately:
• EGSM900~170mVpp
• GSM1800~140mVpp
• GSM1900~160mVpp
Signal part frequency 67.7kHz sine.
Issue 1 01/03
RX I/Q signal ,burst mode, input level –90dBm.
ãNokia Corporation.
Troubleshooting Instructions
Page 15