Vytek Inc PC-US-1 Benutzerhandbuch
OSMAC Base
OSMAC Base
User Manual
Page 39
11 Specifications
Principles of Operation
The
O S M A C B a s e
O S M A C B a s e
is a multi-functional unit which can be used to communicate between the built-in
speaker/microphone, pagers, two -way radios and the telephone interface. The internal circuitry is comprised of
numerous elements as shown on the block diagram below. These include radio transceiver, telephone interface,
microprocessor, front panel I/O, DTMF encoder/decoder, CTCSS encoder/decoder, speech synthesizer (DAC),
microphone amplifier, speaker amplifier, analog filters, limiting amplifier and analog switch matrix. The
microprocessor controls all circuitry as needed for the desired communication function. The encoders generate
needed audio signals and the decoders detect incoming control signals on the received audio. Analog switches
route the analog signals within the unit.
numerous elements as shown on the block diagram below. These include radio transceiver, telephone interface,
microprocessor, front panel I/O, DTMF encoder/decoder, CTCSS encoder/decoder, speech synthesizer (DAC),
microphone amplifier, speaker amplifier, analog filters, limiting amplifier and analog switch matrix. The
microprocessor controls all circuitry as needed for the desired communication function. The encoders generate
needed audio signals and the decoders detect incoming control signals on the received audio. Analog switches
route the analog signals within the unit.
O S M A C B a s e
O S M A C B a s e
Block Diagram
Encoder/Terminal general
Frequencies ..................................................................................450-470MHz, 403-512MHz
Paging Format..............................................................................POCSAG ( tone, numeric, and alpha at 512,
Paging Format..............................................................................POCSAG ( tone, numeric, and alpha at 512,
1200 or 2400bps)
TWO-TONE and GROUP-TONE optional
TWO-TONE and GROUP-TONE optional
Squelch formats ...........................................................................CTCSS or carrier squelch
Serial port protocols ....................................................................TAP, COMP2, COMP1
Pager database maximum size ....................................................1000 individual pagers
Maximum page length.................................................................250 characters
Maximum pre-programmed alarm message..............................40 characters
Maximum number of pager groups...........................................16
Maximum number of pagers per group ....................................75
LCD display size ..........................................................................20 characters X 2 lines
Speaker audio...............................................................................1 watt maximum at <5% THD
Power supply ...............................................................................External 12.0V&5.0VDC, 2A, DIN connector.
Weight ..........................................................................................3.5lbs.
Temperature range ......................................................................-10-+40C
Processor......................................................................................80386EX
Non-volatile flash memory size .................................................2M bytes
Serial port protocols ....................................................................TAP, COMP2, COMP1
Pager database maximum size ....................................................1000 individual pagers
Maximum page length.................................................................250 characters
Maximum pre-programmed alarm message..............................40 characters
Maximum number of pager groups...........................................16
Maximum number of pagers per group ....................................75
LCD display size ..........................................................................20 characters X 2 lines
Speaker audio...............................................................................1 watt maximum at <5% THD
Power supply ...............................................................................External 12.0V&5.0VDC, 2A, DIN connector.
Weight ..........................................................................................3.5lbs.
Temperature range ......................................................................-10-+40C
Processor......................................................................................80386EX
Non-volatile flash memory size .................................................2M bytes
Control Bus
Mic
Speaker
Antenna
Analog
Switch
Matrix
Radio
Transceiver
Front
Panel
Filter
Limiter
Telephone
Interface
Phone Line
DTMF
CTCSS
DAC
Microprocessor
RS232 Port 1
RS232 Port 2
Keyboard
Alarm Inputs