Facts and figures

The following links give an overview of the latest developments in radio technology together with descriptions of various radio systems.

Electromagnetic waves are produced to transfer information between wireless systems. The propagation characteristics of these waves are dependent on the selected frequency, climatic and geographical conditions as well as the time of day and other environmental factors.

These complex propagation characteristics lead to the development of the most diverse radio systems in the broadcasting, mobile radio and radio relay sectors in addition to radar, medical and other industrial applications.

The following links give a description of the various broadcasting (only in German or French) and telecommunications radio systems.

The effect of the human body on wireless microphone transmission

The allocation of the 700 MHz band to mobile communications will further reduce the spectrum available to wireless microphones. New frequency bands will have to be found to accommodate these applications. The human body plays a very important role in wireless microphone transmission and must be taken into account.

Assessment of the notching efficiency of PLC-2G networks

In its role as Swiss regulatory authority, since 2001 OFCOM has performed various measurement campaigns. The results showed that the limit values of the applicable reference standard, NB30, were markedly exceeded by internal and external PLC equipment. On the basis of the results, the question is raised as to whether such equipment meets the fundamental requirements of the European Electromagnetic Compatibility Directive.

Satellite Broadcasting

This report describes the developments in the satellite broadcasting sector. In Europe, the commercial operators ASTRA and EUTELSAT are of particular interest for the reception of TV and radio broadcasts.

Power Line Communication at Solothurn

In its capacity as Swiss regulator, in 2004 OFCOM carried out a measurement programme in the Swiss city of Solothurn in order to make a statistical assessment of the interference level emitted inside buildings by domestic electrical equipment for data transmission using PLC technology. The assessment related to modems of the HomePlug standard, which dominate the European market without any real competition. The modems are for domestic use and are freely available on the Swiss market.

Power Line Communication at Fribourg

In the year 2002 a PLC network had been installed at the Swiss city of Fribourg. With the goal to find out, if and to what extend radio services in the short wave range would be disturbed, the Swiss Federal Office of Communication (OFCOM) accomplished extensive measurements on site. The already existent man made noise at urban and rural areas has been analysed and accounted for as well.

Links

Studies

Research Foundation Mobile Communication