Emergency locating transmitter

Details Emergency locating transmitter Emergency locating transmitter

1988-09-09

1991-05-07

Kuntz, Curtis

Telecommunications

Interference signal transmission

455 99, 455102, H04K 300

Patent

active

050143409

ABSTRACT:
A transmitter generates three signals for sequential transmission. These signals are an unmodulated r.f. carrier, an r.f. carrier amplitude modulated by a first audio frequency waveform and an r.f. carrier amplitude modulated by a second audio frequency waveform which is distinguishable from the first and which may be employed as a means for identifying a particular transmitter. The composite, sequentially transmitted signal may be varied in terms of the individual signal transmission sequence, the duration of the individual signals, overall composite signal repetition rate and the frequency of the second audio waveform. Various combinations of signal variations may be employed to transmit different information.

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patent: 4216545 (1980-08-01), Flickshu et al.
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patent: 4296496 (1981-10-01), Sadler
patent: 4394777 (1983-07-01), Wren
patent: 4485358 (1984-11-01), Andren et al.
patent: 4584708 (1986-04-01), Eilers et al.
patent: 4612667 (1986-09-01), Hansen
patent: 4764978 (1988-08-01), Argo et al.

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