INTERFERENCE
What actually causes the noise in neighbouring receiving sets when reaction is applied to the aerial in such a way as to make it oscillate? The receiving set then acts as a transmitter and sends out a continuous wave. As the set is tuned to a broadcasting wave-length this wave will be very near the frequency of the carrier wave used by the broadcasting station. Either of these waves alone would be inaudible, but when they are present in a receiver simultaneously beats, are formed between them which occur at audible frequency and give rise to a note in the phones or loud speaker. If the tuning condenser is turned so as to bring the wave-lengths nearer to or further from one another the beats will alter in frequency. And the received note will rise or fall accordingly, giving rise to the all too familiar 'howls' and 'chirps' asociated with a set when in the state of oscillation.
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Bibliographic details
Ellesmere Guardian, Volume XLVI, Issue 3256, 21 September 1928, Page 6
Word Count
159INTERFERENCE Ellesmere Guardian, Volume XLVI, Issue 3256, 21 September 1928, Page 6
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