/RDS-TFT2HE, /RDS-TFT3HE & /RDS-TFT4HE
ELETTRONICA
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User Manual
Rev. 1.0 - 01/02/22
1. Introduction
1.1 Main Highlights
• The RDS encoder is made with full digital technology capable to generating a
very high quality of modulation and of spectral purity.
• It supports all popular services including TMC, TDC, IH and EWS.
• The card can be programmed using any UECP SPB490 compatible software.
• The programming software is also supplied, obviously compatible with SPB490,
capable to managing all the functions and services available on the hardware
in addition to the personalized management of PS messages.
• The card is equipped with at least two serial ports, which can be used
respectively for programming and for dynamic data (e.g. TMC data).
• The firmware can be updated via serial port without the need of hardware
settings and without service interruption.
1.2
RDS System Description
The Radio-Data-System is proper for the transmission of information in mono/
stereo programs of VHF/FM (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.
The broadcasted binary signal is in advance put out on a differential codification.
The registry of transmission is at packages of lenght 104 bits (87.6 ms) named
GROUPS, each of them composed of 4 blocks of 26 bits.
Every block is composed of 16 bits of information and of 10 bits of protection, which
are properly studied to allow the recovery of an erroneous word with a maximum
of 5 wrong bits.
They are provided with 16 separete blocks of which 6 are still not defined; every
group begins with a PI identification code (Program Identification) which has
the double intent to synchronize the receiver and to identify the channel which
transmits the signal.
