Page 12 Advertisements Column 1

Press, Volume CI, Issue 29714, 6 January 1962, Page 12

TV TOPICS

QUESTION: Why cannot TV Receivers be fitted with a small, simple Channel Selector? The present 10channc! type seems excessive for what we will ever be likely to require.

ANSWER: Channel Selectors are a ma jor piece of equipment in any Receiver, the ones being fitted in N.Z. are the same as those fitted to sets the world over. Each channel setting in the selector is made to a preset frequency (wave-length) to receive the signals as sent from the transmitter. As very high frequencies are used in television, it is not possible to use an adjustable tuner as used in a household radio, hence the channel selector must have sufficient settings to cope with any possible requirements. To ensure there is no interference from other transmitters, each adjacent station uses a different frequency. Wellington, Auckland and Christchurch are operating at present on Channels 1. 2 and 3. When further transmitters are installed in a few years you will find that Auckland will, for the sake of example, be on Channels 2. 5 and 8. Wellington say 1 and 7 and Christchurch 3 and 9, etc. Another possibility, also, is that in the future we may be able to tune into distant stations by the way of the method adopted overseas at present using booster transmitters which pick up a signal and relay it to places which cannot normally receive the transmission. Also, from latest reports, experiments are very well advanced using space satellites which pick up the signals transmitted and reflect them to distant locations.