A New Broadcasting Station

Radio Record, Volume III, Issue 37, 28 March 1930, Page 33

A New Broadcasting Station

AS station 4ZP, Invercargill, is amongst the most modern of the "B" class stations of New Zealand, listeners (and DX enthusiasts in particular) will be interested in a short description of the installation. The transmitting apparatus stands four feet high and comprises a Hartley oscillator and a Heising modulator. There are three panels. The bottom one contains the transformer, where the power is transformed from 230 volts. to 1000 on each side and passed through four rectifying tubes to rectify the A.C. current to D.C. current. From the rectifying tubes it passés to the filtering and checking system, then through condensers, chokes and filters and up into the transmitting panel. From here the current goes to the oscillating and modulating tubes. The checking of the transmitter is done through 4 metres, the wave length meter, the aerial tuning meter, the hot wire amp. meter and the volt meter. The modulating. meter réquires constant watching, the check on the wave length being through this meter.

The amplifying panel controls the music from the pick-up and microphone. The music is all faded in with a pickup fader. A system of lights acts as a check on the microphone and gramophone pick-ups. There is also a clock pick-up fader for broadcasting chimes over a land line from the post office when the line is put in. Over all is a volume control. . The microphones in the operating room and the studio are the Iatest Western Hlectric models. The whole station is run exactly on the same system as the powerful YA stations. The wavelength used is 258 metres (1160 kilocycles), the same as that of 4ZI,