OVER POWER LINES
REMARKABLE NEW SYSTEM
Visions of more economical, telephone service for farmers and other rural dwellers in New Zealand are opened up by the results of successful experiments carried out in the United States, where power lines have been harnessed to c-rry telephone currents. By the use of power lines to link up settlements in sparsely settled country areas farmers are being provided with telephone service without the work and cost of building telephone lines. Conversations are carried along power lines which sing with the music of current used to drive farm machinery, cook meals and light*and heat homes. Neither current interferes with the other, and there is no danger to the person at the i telephone.
As the farmer sits in an easy chair, with the telephone receiver to his ear, an extra-large wall-box equipped with a unit which generates high frequency "carrier" currents, brings in the voice of the person at the other end, or transmits his words. Out on the street pole near his home the carrier currents are guided to the power line by a carrier coupling device. Outside the district telephone office another coupling device leads the carrier current off the power line and down to a piece of mechanism which changes the waves of sound to voice frequency before connection is made with the switchboard. The operator links up calls to telephones within the circuit, whether power lines or telephone lines are used, so that a conversation may travel partly over a power line and partly over a telephone line. Power lines would not, of course, be used in more closely settled districts, as the cost of the special apparatus would then be greater i than telephone lines.
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OVER POWER LINES, Auckland Star, Volume LXXVI, Issue 176, 27 July 1945
OVER POWER LINES Auckland Star, Volume LXXVI, Issue 176, 27 July 1945
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