Transmitter Part - Pantech G310 Service Manual

G310 Service Manual

4.2.4.2 Transmitter Part

A. 6 dB attenuator : Z705, Z706
These passive components are adopted for PAM to operate in a stable output power.
B. ASM(Antenna Switch Module / built in LPF): Z701
These filters pass through the signals of which frequency band of 880~915MHz, 1850 – 1910 MHz
which is the transmit frequency of GSM, PCS system terminal, and it suppresses other images and
spurious frequencies when the terminal transmits GMSK modulated frequencies.
C. Power AMP Module(PAM): Z710
This device amplifies signals ahead of transmiting them through the antenna to provide a
sufficient RF power. It has amplification factor of 28dB and efficiency of about 55% typically in GSM
band and amplification of 27dB and efficiency of about 52% typically PCS band.
D. RF Switch connector: J701
RF Swithc connector used to test Mainboard's RF characteristics.
E. Antenna: Antenna Contact Plate
This device enables signals to be transmitted and received from BTS by Um interface.
External Antenna can be contacted with Mainboard through Antenna Contact Plate.
6dB Attenuator
Fig.4-9. Transmit part PCB Layout
PANTECH
Antenna Contact
Plate
RF Switch
Connector
20
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