Panasonic EB-GD93, Technical Manual

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RF OVERVIEW
MCUK001001G8 Section 3 Issue 1
Technical Guide – 7 – Revision 0
3 RF OVERVIEW
3.1. Introduction
3.1.1 General Specifications
The telephone is a Dual Band product incorporating two switchable transceivers, one for the 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:
3.1.2. Main PCB Description
All components required for the RF and Logic circuits, excluding the LCD module and backlight LEDs, are contained on the
Main PCB. The Main PCB has six layers with an Any Layer Interstitial Via-Hole (ALIVH) structure which can connect from / to
any layer. Surface and back layer tracks are gold-plated to prevent oxidisation and enable better soldering. The PCB thickness
is 0.7 mm ±0.1 mm.
The majority of RF components are located on both sides of the top half area of the Main PCB. The Keypad PCB back layer
consists mostly of groundplane which is used to provide RF shielding. A metallised plastic chassis has also been designed to
provide smaller walled sections to isolate sensitive RF areas like the synthesiser block from high level interference such as the
PA output and logic noise.
The back cover has a formed shielded enclosure to reduce further spurious emissions and logic noise.
3.2. Functional Description
3.2.1. Frequency Plan
The frequency plan is shown below:
Tx Rx
GSM 900 890-915 MHz 935-960 MHz
GSM 1800 1710-1785 MHz 1805-1880 MHz
GSM 900 GSM 1800
Rx Bandwidth 25 MHz 75 MHz
Tx Bandwidth 25 MHz 75 MHz
Duplex Spacing 45 MHz 95 MHz
Number of Channels 124 374
AFRCN (Channel Numbers) 1-124 512-885
1st Tx Channel 890.2 MHz 1710.2 MHz
Last Tx Channel 914.8 MHz 1784.8 MHz
1st Rx Channel 935.2 MHz 1805.2 MHz
Last Rx Channel 959.8 MHz 1879.8 MHz
Maximum Tx Power 33.0 dBm
(Class 4) (PL5) 30.0 dBm
(Class 1) (PL0)
Minimum Tx Power 5.0 dBm
(PL19) 0.0
(PL15)
Tx Tx IF RFLO Tx IFLO Tx
GSM 900 890 - 915 MHz 270 MHz 1160 - 1185 MHz 540 MHz
GSM 1800 1710 - 1785 MHz 135 MHz 1575 - 1650 MHz 540 MHz
Rx Rx 1st IF Rx 2nd IF RFLO Rx IFLO Rx
GSM 900 935 - 960 MHz 225 MHz 45 MHz 1160 - 1185 MHz 540 MHz
GSM 1800 1805 - 1880 MHz 225 MHz 45 MHz 1580 - 1655 MHz 540 MHz