Nokia NPM-6 Series Troubleshooting Instructions page 16

Troubleshooting Instructions
DC level of signal part is 1.35V. DC level can variate about +/-100mV between I and Q
signals and between different bands as well.
For GSM1900 receiver burst mode I or Q signal at ch 661 with input signal
1960.067MHz, level –90 dBm at RF-connector.
Trace2: With wider time scaling both monitoring and own RX bursts are seen, 1
(shorter) is monitoring and 2
Trace1: External LNA VCC supply voltage at burst mode, input level –90 dBm. Measured
from testpoint LNA_VCC.
Page 16
Figure 9: GSM1900 RX I or Q signal (trace2), burst mode.
nd
burst (longer) is own RX burst.
ãNokia Corporation.
CCS Technical Documentation
Issue 1 01/03
st
burst