Transmitter Tunings; Tx I/Q Tuning - Nokia NHL-2NA Series Troubleshooting Instructions

NHL-2NA

Transmitter Tunings

TX I/Q Tuning

• Spectrum analyzer needed
• Tx IQ Tuning allows changing the Tx I DC Offset, Tx Q DC Offset, Amplitude dif-
ference and Phase difference
• Must be done separately on both bands!
• Start TX I/Q Tuning at EGSM (GSM900), then continue at GSM1800 band.
• Remember to take jig and cable attenuations into account!
• Select Maintenance => Tuning => Tx_IQTuning
• Select "Load from product" => Start
• The tuning is done by setting each of the sliders to desired value. The sliders can
be changed only when the tuning is ongoing.
• The order of tuning should be same as the order of the sliders e.g. the Tx I DC Off-
set is tuned first and Phase difference is tuned last.
• Use <=, =>, PgUp or PgDn keys
Page 38 ¤Nokia Corporation
CCS Technical Documentation
Issue 1 07/02