TEST AND MEASUREMENT
MCUK990801C8
Section 6
Issue 1
Service Manual
– 39 –
Revision 0
Calibration of output power on each power level
To be able to calibrate the ramping gain it is first necessary to switch the unit into Test Mode (Section 6.3.1).
This procedure must be followed for all power levels PL5 to PL19, for low, middle and high channels for GSM 900. GSM 1800
shall be calibrated for all power levels PL0 to PL15 for top middle and bottom channels.
1.
Set the Channel box controls to Channel 62 at Power Level 14, normal burst modulated with random data as follows:
a.
Press the down arrow until CHANGE CH <62> is highlighted and then press ENTER.
b.
Press the down arrow until PL <14> is highlighted. Press the move left arrow until <14> appears in the highlighted field.
Press ENTER.
c.
Press the down arrow until TX DATA <OFF> is highlighted.
Press the move arrow until <NRL R> appears in the highlighted field. Press ENTER.
Figure 6.13: Tx data field
2.
At the GSM test unit measure the Peak Power.
3.
If the measured power is in the range of the target power (see previous table), then proceed to step 10.
4.
At the Channel box press F7 to view the TRIM for the mid-channel.
Figure 6.14: Power level view 1