F800 CIRCUIT DESCRIPTION
2 (25)
Uppgjord (även faktaansvarig om annan) -
Prepared (also subject responsible if other)
Nr
-
No.
KL/ECS/S/LT Magnus Lindahl
ECS/S/LT-96:5044
Dokansv/Godk -
Doc respons/Approved
Kontr
-
Checked
Datum
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Date
Rev
File
KI/ECS/S/LTC
1996-06-06
A
965044.DOC
INTRODUCTION
The Ericsson F800 base station can operate in simplex, semi duplex and duplex mode
or as a repeater station. The unit can be configured to operate as a stand alone, tone
controlled repeater station or base/repeater station in MRS3000 or MRS5000 system.
It is also possible to set up F800 as a carrier controlled repeater station.
F800 is available in both simplex and duplex versions for VHF (68-88 MHz, 146-174
MHz) and UHF (378-470 MHz) bands. A link version for low UHF (370-415 MHz) is
also available. Nominal output power in base and repeater versions are 20 W and in
link version the output power is set to 6 W. If required the output power can be
reduced to two (2) watt. In standard versions the radio has 16 channels but with an
option 255 channels can be used.
The F800 base station is housed in a 19” cabinet intended for rack mounting or with
installation brackets, wall mounting. The cabinet contains a radio unit, line interface
and also has room for built-in filters if required. F800 is powered with external 12V DC
via a 2-pole connector found on the rear of the cabinet. Line and RF connectors are
also found on the rear of the cabinet. In addition to the mentioned connectors there
are connectors for transmitter synchronisation and alarms located at the rear. In OEM
version there is an OEM connector also found at the rear.
Application examples are described in document ECS/S/XT-95:7049,
ECS/S/LT-96:1013, ECS/S/LT-96:1018.
For easy service and maintenance the radio unit is fitted in a cassette and the line
interface is fitted in a slot.
Radio unit
The radio unit includes two sub-units, PCBs, a radio board and a processor board. A
third board, option board, is used whenever any of the options are used. All PCBs are
installed in a die-cast enclosure. All connections between the radio unit and the other
facilities in the cabinet are made through connectors on the rear end of the radio unit
and the corresponding connectors in the cassette.
Processor board
The processor board incorporates an 8-bit microprocessor with periphery circuits for
controlling the frequency generator and transmitter on the radio board and AF paths
found both on the processor board and optional boards. The required software is
stored in one EPROM, Z2. All customer specific parameters are stored in an
EEPROM, Z4. The processor board interfaces external units and provides DC power
to external units. The processor board is used in all versions of F800.
