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7 ADJUSTMENT PROCEDURES
7.1. RF Calibration Procedure
NOTE: See Section 6.2 for a list of the equipment and setup procedures required to perform the following adjustment
and calibration procedures.
The following procedures MUST be performed after replacement or repair of the PCB. Failure to do so may result in incorrect
operation of the telephone.
The following adjustments MUST be made on BOARD with 3.7 V DC applied directly to the battery connector.
There are two distinct calibration procedures to adjust RF performance. These procedures are:
1.
Ramping gain (Section 7.2)
2.
RSSI (Section 7.3)
Battery calibration includes checks on voltage, temperature and charging. These procedures are described in Section 7.4.
Adjustment data selected during calibration is stored in Flash ROM.
7.2. Ramping Gain
The carrier power must be measured and calibrated for each power level at channel 62.
7.2.1.
E-GSM 900
Power Level
(PL)
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
MCUK010801C8
Service Manual
Output Power (dBm)
Target
Nominal
Min
32.05
31.8
30.7
30.2
29
28.5
27
26.5
25
24.5
23
22.5
21
20.5
19
18.5
17
16.5
15
14.5
13
12.5
11
10.5
9
8.5
7
6.5
5
4.5
Spec
Max
Min
32.3
31.8
31.2
30.0
29.5
28
27.5
26
25.5
24
23.5
22
21.5
20
19.5
18
17.5
16
15.5
14
13.5
12
11.5
10
9.5
8
7.5
6
5.5
4
Section 7
– 37 –
ADJUSTMENT PROCEDURES
Change / dB
Max
32.8
3.5
31.8
4
30
4.5
28
4.5
26
4
24
4.5
22
4
20
4.5
18
4
16
4
14
4
12
4
10
4
8
3.5
6
3.5
Revision 0
Issue 1
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