Appendix A: RF Troubleshooting
4.1.2
4.1.3
4.2
4.2.1
4.2.2
Hinku WCDMA LNA output ok?....................................................................................................................99
4.2.3
4.2.4
4.2.5
4.2.6
RAP3G faulty?................................................................................................................................................ 108
4.3
4.3.1
4.3.2
4.3.3
Are TX-IQ signals ok? .................................................................................................................................. 111
4.3.4
4.3.5
5.
5.1
5.1.1
5.1.2
5.2
5.3
GSM Transmitter phase error ok? .................................................................................................................... 113
5.4
5.5
TX power vs. time ok? ......................................................................................................................................... 113
6.
6.1
6.1.1
6.1.2
6.2
6.3
6.3.1
6.3.2
6.3.3
6.3.4
Are TX-IQ signals ok? .................................................................................................................................. 115
6.3.5
6.3.6
6.4
6.5
Troubleshooting pictures................................................................................................................................... 117
6.5.1
6.5.2
6.5.3
6.5.4
6.5.5
6.5.6
GSM RX IQ (DC Offset 0.4 V)........................................................................................................................ 120
6.5.7
6.5.8
TX Modulation spectrum (GSM) ............................................................................................................... 122
6.5.9
RFBUS............................................................................................................................................................... 123
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