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6. SERVICE AND CALIBRATION
6.2.3 Equipment Setup
GSM Test Set(8960)
GPIB Cable
Mobile Switch Cable
GPIB
Power Supply
Cable
Battery SIMulator
PC
Jig
TA
Figure 7-1. Calibration Equipment List
6.2.4 Calibration steps
A. RX Calibration
In order for the RSSI measurements to be within the GSM specifications, some calibration is
necessary. Also, due to AGC implementation, some AGC specific constants need calibration. In
total, three calibrations are required per receive band, AGC calibration, channel compensation and
temperature compensation. Of these, temperature compensation is not needed in replacement of
the circuit. In AGC calibration the reference power fed into the phone via permanent antenna
connector is -74dBm. In channel compensation, the channel numbers in Rx band are;
GSM850 band : 128, 139, 150, 170, 190, 202, 213, 232 and 251
PCS band : 512, 562, 661, 711, 761, and 885.
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