Two special cases

1. In certain districts where two of the programmes are very strong, a listener may sometimes notice a background of one of them when his receiver is tuned to the other. This is caused almost invariably by the effect of nearby domestic pipework, electric wiring, etc., on the aerial. The remedy is to provide a more efficient aerial erected well clear of such objects, preferably on a chimney stack.

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2. Listeners who live very close to a transmitting station may find it difficult to eliminate that particular transmission. This can in many cases be cured by realignment of the internal circuits of the receiver, which will restore its original selectivity, but when this is insufficient, a good aerial should be used, to provide strong signals of the desired programmes, and a tuned wave-filter used to eliminate the local transmission. The manufacturer of the receiver will in most cases be able to supply or specify a suitable wave-filter, which should be connected between the aerial downlead and the aerial terminal of the receiver.

Published by the British Broadcasting Corporation, 35 Marylebone High Street, London, W.1, and printed by The Broadwater Press Ltd, Welwyn Garden City, Herts.

[No. 2184/5]

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BBC ENGINEERING INFORMATION DEPARTMENT // AUGUST 1951