Abstract
PRACTICAL experience seems to prove that radio transmission can only be utilised to its greatest advantage when wire connexions are used in part of the circuit. In the early days radio was a competitor with wire transmission, but now it co-operates with it, the co-operation being to their mutual advantage. The transmitting stations in a broadcast system are situated outside the cities where the studios are situated, and are connected to them by wires. In Electrical Communication for July, A. Muri, chief engineer of the postal administration at Bern, gives an interesting account of the Swiss broadcast network. For broadcasting purposes, Switzerland is divided into three zones. For French-speaking Switzerland, the main transmitter is at Sottens and is fed by the studios at Lausanne and Geneva. For German-speaking Switzerland, the main transmitter is at Beromiinster and there are two relay transmitters at Bern and Basel. All three transmitters broadcast the same programme, and are fed from the studios at Zurich, Bern, and Basel as required. The main transmitter for Italian-speaking Switzerland is still under construction at Monte Ceneri. When completed it will be erved by the studio at Lugano. In order to meet the equirements for music transmission, circuits having a cut-off frequency of 10,000 are provided. This enables a sound spectrum of 35–7500 cycles per second to be obtained without distortion. In addition, there exist lightly loaded circuits having a cut-off frequency of 6800 cycles, giving a range of 150–5000 cycles for broadcast speech transmission. At present 87 per cent of all the toll circuits are in underground cable.
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The Swiss Broadcast Network. Nature 130, 502–503 (1932). https://doi.org/10.1038/130502c0
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DOI: https://doi.org/10.1038/130502c0