DUTCH SHORT-WAVE BROADCASTS

Sun (Auckland), Volume III, Issue 795, 16 October 1929, Page 16

DUTCH SHORT-WAVE BROADCASTS

For the convenience of listeners on short-wave receivers who get or wish to get the Dutch station PCJ, Philip’s Radio have drawn up a schedule of PCJ's transmissions specially intended for New Zealand. PCJ’s wave length is 31.3 metres. The station is on the air New Zealand time on Fridays from 5.30 a.m. till 7.30 a.m., and 9.30 a.m. till 2.30 p.m., and on Saturdays from 5.30 a.m. till 7.30 a.m., and 9.30 a.m. till 5.30 p.m. TRANSATLANTIC RADIOPHONE When a person in New York is speaking to a friend in England by medium of the transatlantic radiophone the voice current from New York is received at the radio transmitting station at Dawrenceville over an ordinary telephone line. Here the voice current is transferred to the radio circuit and amplified many times. The room in which this operation is performed is completely sheathed in copper, which prevents the radio waves from coming back and impairing the operation of the apparatus indoors. From the telephone “line terminal room” the voice current passes to a "control turret”; after passing through this, the voice current is further amplified and then passes to the modulator. Into this modulator there is also sent a current of' very high frequency, at a range of 5,000,000 to 25,000,000 cycles a second. The carrier wave modulated by the voice wave now passes to the final amplifiers, of which water-cooled valves form an integral part. The plate voltage of the valves in the filial amplifier is about 10,000. From the final amplifier the current is carried to the desired antenna by open wires on short poles.