NEW PORTABLE AMPLIFIERS
|F you’ve ever sat in the sight of the NZBS team handling the relay from a concert by the National Orchestra you may have wondered about the function of the portable equipment that the technicians use. The Listener learned some thing about this the other day when N R. Palmer, supervising engineer at NZBS Head Office, told us about the new Outside Broadcasts concert amplifiers now in use throughout the country "When we do a major outside broad-cast-a concert, an opera. or some cther
complex event-we have to take along portable equipment to amplify and control the outputs of the various microphones used," Mr. Palmer explained. "The output from the amplifier is then carried to a. programme line and fed to the station control room, where it is handled as a programme in the ordinary way." : \ These portable amplifiers had to be designed to suit the class of work to which they would be applied, Mr. Palmer said. Naturally they should be as small and light as possible, and until recently the NZBS had standardised on a general purpose amplifier with facilities for controlling four microphones. For a complex broadcast, however, it has been necessary to use two or more of these four-channel units together. This gave a satisfactory result technically, but it was difficult and inconvenient in operation. "For about three years the Head Office Engineering Section _has_ been working intermittently on the design of a new O.B, concert amplifier, and the units we have recently put into use represent the final result of this work," said Mr. Palmer. "The new amplifier can deal with a broadcast requiring up to eight microphones. The controls are grouped on the front of the unit on one panel, with the necessary keys, indicating lights, and programme meters (level indicators) all conveniently placed." The new amplifier was designed entirely by NZBS engineers, and the units now in use were built by a Wellington radio manufacturing company. Two of the units have gone to each of the main centres and one to each of the YZ stations,
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New Zealand Listener, Volume 29, Issue 731, 17 July 1953, Page 9
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346NEW PORTABLE AMPLIFIERS New Zealand Listener, Volume 29, Issue 731, 17 July 1953, Page 9
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