GB310 Service Manual
1
PANTECH
is 881.5
±
12.5MHz for GSM850 bands, 1960.2
±
30 MHz for PCS bands and transmits it to dual
saw filter. The Tx filter passes through the output signals of frequency band that is 836.5MHz
±
12.5MHz for GSM850 bands, 1880.2
±
30 MHz for PCS bands from the power amplifier and
transmits it to the antenna. The maximum insertion loss is about 0.8 dB for the receiving bands at
25
o
C and about 1.35 dB for the transmitting bands at 25
o
C.
B. SAW filter (BPF / Band select filter): F301, F303
The
F301
filter is for the GSM850 band signals which range 881.5
±
12.5MHz with low insertion loss.
And the
F303
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 GSM850 and
PCS’s maximum insertion loss is 3.2 dB.
Fig.4-7. Receiver part PCB Layout
Antenna
Swithch
Module
GSM
SAW
Filter
PCS
SAW
Filter
RF Transcever
