Pantech G310 Service Manual

Pantech G310 Service Manual Manual pdf 19 page image

G310 Service ManualPANTECH R&D CONFIDENTIAL184.2.3.2 Receiver PartA. Diplexer: Z701Diplexer consists of Tx filter, having an antenna port, and dual configuration with the transmittingpath isolated from the receiving path. A signal receives from the antenna of frequency band whichis 942.5 17.5MHz for EGSM bands, 1960.2 30 MHz forPCS bands and transmits it to dual sawfilter. The Tx filter passes through the output signals of frequency band that is 897.5MHz 17.5MHzfor EGSM bands, 1880.2 30 MHz for PCS bands from the power amplifier and transmits it to theantenna. The maximum insertion loss is about 0.8 dB for the receiving bands at 25 o C and about1.35 dB for the transmitting bands at 25 o C.B. SAW filter (BPF / Band select filter): Z510, Z511The Z510 filter is for the EGSM band signals which range 942.5 17.5MHz with low insertion loss.And the Z511 filter passes the PCS bands that cover 1960.2 3MHz.These filters degrade other band signals with high passing loss of 30~60 dB. The EGSM and PCS’smaximum insertion loss is 3.2 dB.PFig.4-7. Receiver part PCB Layout