Rf Tunings; Introduction To Rf Tunings; Auto Tuning For Bb5.0 - Nokia RM-237 Service Manual

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RF tunings

Introduction to RF tunings

Important:
• 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 (MJ-122), never with an RF
coupler. Using an RF coupler in the calibration phase will cause a complete mistuning of the RF part.
Important:
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.
For RF attenuations of the module jig, please refer to the Service tools section.

Auto tuning for BB5.0

This phone can be tuned automatically.
Autotune 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
Hardware requirements for auto tuning:
• PC (Windows 2000/XP) with GPIB card
• Power supply
• Product specific module jig
• Cables: XRF-1 (RF cable), USB cable, GBIP cable and DAU-9S
• Signal analyser (TX), signal generator (RX) and RF-splitter
Page 7 –18
Only perform RF tunings if:
After RF component replacements, always use autotuning. Manual tunings are only
Figure 49 Auto tuning concept with CMU200
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RF Troubleshooting and Manual Tuning Guide
or one device including all.
RM-237
Issue 1