European Broadcasters
In Germany, carrier current transmission was called Drahtfunk. In Switzerland, Telefonrundspruch used telephone lines. In the Soviet Union, PLC was very common for broadcasting since the 1930s because of its low cost and accessibility, and because it made reception of uncensored over-the-air transmissions more difficult. In Norway the radiation of PLC systems from powerlines was sometimes used for radio supply. These facilities were called Linjesender.
In all cases the radio programme was fed by special transformers into the lines. To prevent uncontrolled propagation, filters for the carrier frequencies of the PLC systems were installed in substations and at line branches.
An example of the programs formerly carried by "wire broadcasting" in Switzerland:
- 175 kHz Swiss Radio International
- 208 kHz RSR1 "la première" (French)
- 241 kHz "classical music"
- 274 kHz RSI1 "rete UNO" (Italian)
- 307 kHz DRS 1 (German)
- 340 kHz "easy music"
Systems using telephone wires were incompatible with ISDN use which required the same bandwidth for digital data. The Swiss and German systems have been discontinued, but in Italy Filodiffusione still has several hundred thousand subscribers.
Read more about this topic: Carrier Current
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