User Guide

2115i/2116/2116i (RH-66)
RF Description and Troubleshooting
Page 16 ©2005 Nokia Corporation Company Confidential Issue 1 03/2005
Cell Receiver Check from RF to IQ
Use the following values to check the CDMA Cell Rx functionality from RF to IQ output.
1. Start Phoenix in Local Mode with only the Rx path turned on.
2. Inject a –75 dBm CW signal of 881.82 MHz (i.e. 300 kHz offset from 881.52 MHz
or 10 channels away).
3. Measure a 300 kHz tuning on the analyzer. You should see a typical -21 dBm IQ
tuning for CDMA Cell.
Figure 10: Receiver IQ level on CDMA Cell band
Figure 11 shows the Cell spectrum with an inject tone at -75 dBm, as well as the IQ
output test points. Note that DC is present on the IQ output test points. All test points
should be approximately equal.
dBm
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
Cell I Q Output
Trace A
Centre: 300 kHz Span: 200 kHzAtten: 10 dB
Res BW: 3 kHz Vid BW: 3 kHz Sweep: 100 ms
5/5/2004 3:29:30 PM HP8595ECellIQ.spt
1
1
Trace A
302 kHz
-21.2500 dB
m