Induction field Clause Samples

Induction field radio system The induction field radio system is a frequency-modulated system normally operated on a carrier frequency of 3175 kHz allocated by the International Telecommunications Union (ITU). This allocation is shared by other radio services, which may occasionally interfere. The basic feature of the induction field radio hearing aid system is its localized wireless transmission in which the induction field is strong near the transmitter but rapidly becomes weaker with increasing distance; a low power battery-operated version is limited to a range of about 12 metres. When several systems are in use in a confined area, the receiver responds only to the strongest signal. This system is particularly useful when the speaker, wearing a portable transmitter and associated microphone, must move about in company with the listeners, for example on guided tours in museums and art galleries.