– 5–1 –
5.1. RF Overview
5.1.1. Introduction
5. TECHNICAL DESCRIPTION
■
General Specifications
The telephone is a Dual Band product incorporating two switch able 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 salient technical features are as follows:
■
Main PCB Description
All components required for the RF and Logic circuits, excluding the LCD module, are contained on a single
printed circuit board (PCB). The PCB has six layers with lay1-2 and layer 5-6 build-up Surface and back layer
tracks are gold-plated to prevent oxidization and enable better soldering. The PCB mother broad thickness is 1
mm
±
0.1 mm; MMI is 0.4 min
±
0.05 mm. All RF components are located on one side of the bottom half area of
the PCB, with the baseband components (Logic circuits) occupying the lower half of the PCB. A metallised shield
shields the RF circuit area. The top half of the back case has been designed to provide a shielded enclosure to
reduce further spurious emissions and logic noise.
Tx
Rx
E-GSM 900
880 - 915 MHz
925 - 960 MHz
GSM 1800
1710 - 1785 MHz
1805 - 1880 MHz
GSM 850
824 - 849 MHz
869 - 894 MHz
GSM 1900
1850 - 1910 MHz
1930 - 1990 MHz
E-GSM 900
GSM 1800
GSM 850
GSM 1900
Rx Bandwidth
35 MHz
75 MHz
25 MHz
60 MHz
Tx Bandwidth
35 MHz
75 MHz
25 MHz
60 MHz
Duplex Spacing
45 MHz
95 MHz
45 MHz
80 MHz
Number of Channels
174
374
124
299
AFRCN(Channel Numbers) 0 - 124
975 - 1023
512 - 885
128 - 251
512 - 810
1st Tx Channel
880.2 MHz
(Ch975)
1710.2 MHz
(Ch512)
824.2 MHz
(Ch128)
1850.2 MHz
(Ch512)
Last Tx Channel
914.8MHz
(Ch124)
1784.8 MHz
(Ch885)
848.8 MHz
(Ch251)
1909.8 MHz
(Ch810)
1st Rx Channel
925.2 MHz
(Ch 975)
1805.2 MHz
(Ch512)
869.2 MHz
(Ch128)
1930.2 MHz
(Ch512)
Last Rx Channel
959.8 MHz
(Ch124)
1879.8 MHz
(Ch885)
893.8 MHz
(Ch251)
1989.8 MHz
(Ch810)
Maximum Tx power
33.0dBm
{Class 4}(PL5)
30dBm
{Class 1}(PL0)
33.0dBm
{Class 4}(PL5)
30dBm
{Class 1}(PL0)
Minimum Tx power
5.0dBm
(PL19)
0.0dBm
(PL15)
5.0dBm
(PL19)
0.0dBm
(PL15)
Содержание EBG60 - CELL PHONE
Страница 19: ... 5 2 5 1 2 RF Function Block Figure 5 1 RF Function Block Diagram ...
Страница 35: ... 5 18 5 15 POWER SUPPLIES 5 15 1 Introduction ...
Страница 77: ... 8 19 Modify Cable lose ...
Страница 89: ... 11 1 11 LAYOUT DIAGRAMS 11 1 Main PCB ...
Страница 90: ... 11 2 11 2 Key PCB ...