Technical Description; Rf Overview - Panasonic EB-X70 Service Manual

4 TECHNICAL DESCRIPTION

4.1. RF Overview

4.1.1 General Specifications
The telephone is a triple band product incorporating three switchable transceivers, EGSM 900 band,GSM 1800 (DCS 1800)
band and GSM 1900 band. The transmit and receive bands are given in the table below:
EGSM 900
GSM 1800
GSM 1900
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 Tx Power
Minimum Tx Power
4.1.2 Description of PCBs
The handset is of clam-shell design and uses two printed circuit boards (PCBs).
The Main PCB is constructed of eight-layer FR4 material. All RF components are located on one side of the top half area of
the Main PCB, with the baseband components (Logic circuits) occupying the lower half of the Main PCB. The RF circuit area
is shielded by two metal screens. The Logic and Bluetooth circuits are shielded by one screen each.
The keypad is mounted on the reverse side of the Main PCB.
The second PCB is of flexible printed circuit type. All components and the connectors for the Sub LCD module, camera,
receiver, main display (x2) are located on one side of this assembly.
PMCD030901C8
Service Manual
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Tx
880-915 MHz
1710-1785 MHz
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 124)
33.0 dBm
(Class 4) (PL5)
5.0 dBm
(PL19)
Section 4
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TECHNICAL DESCRIPTION
Rx
925-960 MHz
1805-1880 MHz
1910-1990MHz
GSM 1800
75 MHz 60MHz
75 MHz 60MHz
95 MHz 80MHz
374 299
512 - 885 512 - 810
1710.2 MHz 1850.2MHz
(Ch 512) (Ch 512)
1784.8 MHz 1909.8MHz
(Ch 885) (Ch 885)
1805.2 MHz 1930.2MHz
(Ch 512) (Ch 512)
1879.8 MHz 1989.8MHz
(Ch 885) (Ch 885)
30.0 dBm 30.0 dBm
(Class 1) (PL0) (Class 1)
0.0 dBm 0.0 dBm
(PL15) (PL15)
GSM 1900
Issue 1
Revision 0