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2. Select data source and band, then press Start. It is recommended to have saved data from a known good
phone to the PC.
3. Connect the module jig RF output to the measurement instrument. The power must be tuned in only high
TX PA mode in all bands of GSM900, GSM1800 and GSM1900.
4. For each band, tune the power by adjusting the coefficient in the Tx Power Level Tuning window in Phoenix
until the target level is reached (measured on the spectrum analyzer). Remember to take into account the
external power loss, that is, the loss of the cable and the external attenuator at the spectrum analyzer input.
The coefficient must be tuned for the base level and other power levels (PL) marked with bold letters in
Phoenix (GSM900: PL19 / 15 / 5, GSM1800/1900: PL15, 11, 0). The target power levels are specified as listed
in the following table:
GSM900
PL 5
PL 15
PL 19
Base PL
5. When the tuning for the levels marked with bold letters has been completed, press Calculate coefficients to
calculate the other power levels with non-bold letters.
Page 7–34
Figure 135 Phoenix Power Level Tuning menu
Table 29 Spectrum analyzer settings for Tx level tuning
GSM1800
32.5 dBm
PL 0
13.0 dBm
PL 11
5.0 dBm
PL 15
-30.0 dBm
Base PL
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GSM1900
29.5 dBm
PL 0
8.0 dBm
PL 11
0.0 dBm
PL 15
-30.0 dBm
Base PL
RM-25
RF troubleshooting
29.5 dBm
8. 0dBm
0.0 dBm
-30.0 dBm
9235618 (Issue 2)
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