– 8–4 –
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.
8.3.2. Main Subjects
<A> TX Power
8
TX Power Scaling Factors
8
TX Freq Compensation
<B> RX RSSI (Received Signal Strength Indication)
8
Accurate Gain Control
8
RX Freq Compensation
<C> Battery Calibration
Band
TX/Fu(n)
RX/Fl(n)
ARFCN
E-GSM900
Fl(n)=Fu(n)+45
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
ARFCN: Absolute Radio Frequency Channel Numbers
Fu(n)=890+0.2*n
Fu(n)=890+0.2(n-1024)
0 n 124
975 n 1023, Middle: 37