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4.
TECHNICAL DESCRIPTION
4.1.
RF Overview
4.1.1
General Specifications
The telephone is a triple band product incorporating three switchable transceivers, GSM 900 (EGSM 900) band,
GSM 1800 (DCS 1800) band, and GSM 1900 (PCS 1900) band. The transmit and receive bands are given in the table below:
Other notable technical features are as follows:
Rx Bandwidth
Tx Bandwidth
Duplex Spacing
Number of Channels
ARFCN (Channel Numbers)
1st Tx Channel
Last Tx Channel
1st Rx Channel
Last Rx Channel
Maximum calibrated Tx Power, Voice Call 32.25 dBm
Minimum calibrated Tx Power, Voice Call
4.1.2
Description of PCBs
The handset, which is in the form of a clamshell, contains three printed circuit boards. The main PCB is based on an 8 layer
methodology, constructed using ALIVH-G material. It carries all the RF components on the top half and the baseband
components (Logic circuits) on the lower half. The key pad is mounted on the reverse side of the main PCB. The RF circuit
area is shielded by two metal screens. One compartment contains the Antenna Switch Module (ASM), Power Amplifier
Module (PAM), TX SAW filter and limiter amplifier. The other shielded compartment contains the transceiver IC (Smarti-DC +),
TCXO, 3rd Harmonic (H3) filters, and the RX SAW filters. The logic and Bluetooth circuits are shielded by one screen each.
The second PCB is a flexible printed circuit. One side of its assembly consists of all the components and connectors required
for the sub LCD module, camera and main display. The third is a 4 layer PCB constructed using FR4 material. This board
contains the mini-SD and SIM card holders, as well as the vibrator.
PROVISIONAL ISSUE
EGSM 900
880-915 MHz
DCS 1800
1710-1785 MHz
PCS 1900
1850-1910MHz
EGSM 900
35 MHz
35 MHz
45 MHz
174
975 - 1023
0 - 124
880.2 MHz
(Ch 975)
914.8 MHz
(Ch 124)
925.2 MHz
(Ch 975)
959.8 MHz
(Ch 975)
(Class 4) (PL5)
5.0 dBm
(PL19)
Tx
Rx
925-960 MHz
1805-1880 MHz
1930-1990MHz
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 512)
29.25 dBm
(Class 1) (PL0)
0.0 dBm
(PL15)
− 4-1 −
GSM 1900
60MHz
60MHz
80MHz
299
512 - 810
1850.2MHz
(Ch 512)
1909.8MHz
(Ch 810)
1930.2MHz
(Ch 512)
1989.8MHz
(Ch 810)
29.25 dBm
(Class 1)
0.0 dBm
(PL15)
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