User Guide

Figure 26 WCDMA power window

RF tunings

Introduction to RF tunings

Important: Only perform RF tunings if:

• one or more of the RF components have been replaced

• flash memory chip is replaced or corrupted.

RF calibration is always performed with the help of a product-specific module jig, never with an RF coupler.

Using an RF coupler in the calibration phase will cause a complete mistuning of the RF part.

Important: After RF component replacements, always use autotuning. Manual tunings are only

required in rare cases.

Cable and adapter losses

RF cables and adapters have some losses. They have to be taken into account when the phone is tuned. As

all RF losses are frequency dependent, the user has to act very carefully and understand the measurement

setup.

The following table shows the RF attenuation values for product specific module jig:

Attenuation values for module jig MJ-141

Band Tuning

Channel

Attenuation

Tolerance RX Attenuation

Tolerance

GSM 850 190 0 +/- 0.1 -0.4 +/- 0.1

GSM 900 37 -0.1 +/- 0.1 -0.4 +/- 0.1

GSM 1800 700 -0.5 +/- 0.1 -0.7 +/- 0.1

GSM 1900 661 -0.7 +/- 0.1 -0.7 +/- 0.1

RM-244

RF troubleshooting

Issue 1 COMPANY CONFIDENTIAL Page 4 –15