Auto Tuning; Introduction To Rf Tunings - Nokia N900 Service Manual

RX-51
Cellular RF troubleshooting
Figure 25 Cellular RF test points 2

Auto tuning

Introduction to RF tunings

RF tuning is always performed with the help of a product-specific module jig, never with an RF coupler. Using
an RF coupler in the tuning phase will cause a complete mistuning of the RF part.
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. For RF attenuations of the module jig and RF cable, please refer to the Service Tools section.
Auto tuning
This phone can be tuned automatically.
Auto tuning is designed to align the phone's RF part easier and faster. It performs calibrations, tunings and
measurements of RX and TX. The results are displayed and logged in a result file, if initiated.
Hardware set up
Service concept for RF testing and RF/BB tuning
For hardware requirements for auto tuning, please refer to
in section 'Service Tools and Service Concepts'.
Phoenix preparations
Nokia_firmware_RX-51_EUROPE_10.014_v41.0.exe . This
Install the phone specific data package, for example
defines phone specific settings.
Auto tuning procedure
1 Make sure the phone (in the jig) is connected to the equipment. Otherwise some menus will not be shown
in Phoenix.
2 To go to autotune, select Tuning (Alt-U)→Auto-Tune (Alt-A) from the menu.
Tune button.
3 Start autotuning by clicking the
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