Samsung SCH-i830 Service Manual page 12

Circuit Description
2-4-2. Transmitter
Antenna(ANT1)
Antenna(ANT1) sends signal to the base station and receives the signal from the base station.
It covers GSM TX band, CDMA RTX band, GPS band, DCS RTX band.
RF Switch(U1201)
It(U902) is used to switch the PCS path, the CDMA path GSM/DCS path and the GPS path,
The RF signal pass through CDMA path when CELL_MODE is high.
PCS_MODE, CELL_MODE and GPS_MODE are digital signals from MSM6500 GPIO.
ASM(DUF1200)
Antenna Switch Module(DUF1200) allows Rx frequency range(881.49 ±12.5 MHz)
to come to the RX path and also allows Tx frequency range to go out to antenna
by switching between RX block and TX block..
Power Amp(PAM1101)
Power amplifier module(PAM1101) amplifies signal to be sent to the base station
through the antenna.
Up-Converter(VCO1101)
The up-converter(VCO1101) generate Tx RF signal by receiving the tune voltage
that correspond proper frequency.
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