R.V.R. Elettronica SDC100, User Manual, Page: 25 / 88

SDC100
21 / 42 User Manual Rev. 3.0 - 09/10/01
c) To automatically change over from a station which doesn’t transmit traffic
news.
The R.D.S. is proper for the transmission of information in mono/stereo programs
of VHF/MF (87.5-108 Mhz).
It satisfies the requested requirements to the transmission of supplementary data
on radio programs:
1) Compatibility with the current mono/stereo transmissions;
2) Absence of interferences towards the adjacent programs;
3) Compatibility with other identification systems which are already working.
The system, selected by an international specialistic team, allows the data
transmission at a speed of 1187.5 bit/sec with phase modulation at two levels ,
carrier wave 57 MHz and range ±2 Khz.
This board implements the synchronization with the pilot tone and the generation
ofmthe modulated subcarrier, using the data provided by the CPU card.
8.7.1 CPU Card
The CPU card is fixed to the R.D.S. board.
This board generates the bit stream that is transmittes on the RDS channel. It is
programmed externally via the serial interface.
The main characteristics of the CPU board are:
•
Microprocessor: 80C552
•
Eprom size: 64KBytes
•
Static RAM size: 32KBytes
•
Communication interfaces: RS232-RS485 and I 2 C Bus
•
Self-diagnosys Leds: 9, red