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4 TECHNICAL DESCRIPTION
4.1. RF Overview
4.1.1
General Specifications
The telephone is a Dual Band product incorporating two switchable transceivers, one for the E-GSM 900 band and another for
the GSM 1800 (DCS 1800) band. The transmit and receive bands for the mobile are given in the table below:
Other notable technical features are as follows:
Rx Bandwidth
Tx Bandwidth
Duplex Spacing
Number of Channels
AFRCN (Channel Numbers)
1st Tx Channel
Last Tx Channel
1st Rx Channel
Last Rx Channel
Maximum Tx Power
Minimum Tx Power
4.1.2
Main PCB Description
All RF components are located on one side of the top half area of the PCB, with the baseband components (Logic circuits)
occupying the lower half of the PCB. The RF circuit area is shielded by two metal screens and the Logic circuits area by one
screen.
The LCD Module and keypad are mounted on the reverse side of the PCB.
MMCD020801C8
Service Manual
Tx
E-GSM 900
880-915 MHz
GSM 1800
1710-1785 MHz
35 MHz
35 MHz
45 MHz
174
0-124
975 - 1023
880.2 MHz
(Ch 975)
914.8 MHz
(Ch 124)
925.2 MHz
(Ch 975)
959.8 MHz
(Ch 124)
33.0 dBm
(Class 4) (PL5)
5.0 dBm
(PL19)
Section 4
– 7 –
Rx
925-960 MHz
1805-1880 MHz
E-GSM 900
GSM 1800
75 MHz
75 MHz
95 MHz
374
512-885
1710.2 MHz
(Ch 512)
1784.8 MHz
(Ch 885)
1805.2 MHz
(Ch 512)
1879.8 MHz
(Ch 885)
30.0 dBm
(Class 1) (PL0)
0.0 dBm
(PL15)
TECHNICAL DESCRIPTION
Issue 1
Revision 0
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