Nokia 2125 Troubleshooting Manual page 18

2125/2125i/2126/2126i/2128i (RH-71)
RF Description and Troubleshooting
PCS I Q Output
dBm
Trace A
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
Centre: 500 kHz
Res BW: 3 kHz
5/5/2004 3:37:55 PM
Figure 13 shows the PCS 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, and all test
points should be approximately equal.
Figure 13: PCS spectrum (left) and IQ output test points (right)
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2
Atten: 10 dB
Vid BW: 3 kHz
PcsIQ.spt
Figure 12: Receiver IQ Level on PCS Band
©2005 Nokia Corporation
Span: 200 kHz
Sweep: 100 ms
HP8595E
RX_QN
RX_IP
RX_IN
RX_QP
Company Confidential
2 Trace A
503 kHz
-22.4500 dBm
ISSUE 1 08/2005