Pantech PG-1210 Service Manual

Also see for PG-1210: User manual

Pantech PG-1210 Service Manual Manual pdf 17 page image

PG-1210 Service Manualswitching bands. The transmit output path is automatically selected by the ARFCN bits and theBANDIND bits.4.2.4.2 Transmitter PartA. 3 dB attenuatorThese passive components are adopted for PAM to operate in a stable output power.B. ASM (Antenna Switch Module / built in LPF)These filters pass through the signals of which frequency band of 824~849MHz,1710MHz~1785MHz, 1850MHz~1910MHz which is the transmit frequency of GSM850, DCS,PCS system terminal, and it suppresses other images and spurious frequencies when theterminal transmits GMSK modulated frequencies.C. Power AMP Module(PAM)This device amplifies signals ahead of transmiting them through the antenna to provide a sufficientRF power. It has amplification factor of 28dB and efficiency of about 49% typically in GSM850 bandand amplification of 20dB and efficiency of about 53% typically in DCS/PCS band.4.2.5 VC-TCXO(Voltage Controlled Temperature Compensated Crystal Oscillator)This is the mobile station’s reference frequency source. Its frequency is 26MHz, this signal isapplied to the XOUT Buffer in Si4210 and the XOUT Buffer provides the 13MHz system referenceclock.16PANTECH