G310 Service Manual
PANTECH
R&D
CONFIDENTIAL
18
4.2.3.2 Receiver Part
A. Diplexer: Z701
Diplexer consists of Tx filter, having an antenna port, and dual configuration with the transmitting
path isolated from the receiving path. A signal receives from the antenna of frequency band which
is 942.5
±
17.5MHz for EGSM bands, 1960.2
±
30 MHz forPCS bands and transmits it to dual saw
filter. The Tx filter passes through the output signals of frequency band that is 897.5MHz
±
17.5MHz
for EGSM 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): Z510, Z511
The
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’s
maximum insertion loss is 3.2 dB.
P
Fig.4-7. Receiver part PCB Layout
