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8.3. Adjustment Procedure
8.3.1. Equipment Setting for TX/RX adjustment
1. Connect all equipments as above.
2. Please set the cable loss within the GSM tester before proceeding to any tests. It's recommended that each band (GSM 900
/DCS 1800/PCS 1900) tested separately.
3. Power on the handset before executing the main program.
4. Change the handset comport setting: *#369# -> Com port -> GENIE
Notice:
1. Please make sure the RF probe contacts properly during the test process.
2. Remember to set the handset comport setting back to "Off" after adjustment, or it will cause malfunction to earphone.
<A> TX Power
■
TX Power Scaling Factors
■
TX Freq Compensation
<B> RX RSSI (Received Signal Strength Indication)
■
Accurate Gain Control
■
RX Freq Compensation
<C> Battery Calibration
8.3.2. Main Subjects
ARFCN : Absolute Radio Frequency Channel Numbers
Band
TX/Fu(n)
RX/Fl(n)
ARFCN
E-GSM900
Fu(n) = 890+0.2*n
Fl(n) = Fu(n)+45
0 < n < 124
Fu(n) = 890+0.2(n-1024)
975 < n < 1023, Middle: 37
DCS1800
Fu(n) = 1710.2+0.2(n-512)
Fl(n) = Fu(n)+95
512 < n < 885, Middle: 698
PCS1900
Fu(n) = 1850.2+0.2(n-512)
Fl(n) = Fu(n)+80
512 < n < 810, Middle: 661
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Power Supply
PC
3.8 V
GSM Tester
RF Cable
Dummy Battery
D/L Cable