Transmitter-receiver employing automatic channel hunting and sel

Details Transmitter-receiver employing automatic channel hunting and sel Transmitter-receiver employing automatic channel hunting and sel

1976-03-25

1978-01-17

Griffin, Robert L.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

325 55, 325470, 343179, H04B 140

Patent

active

040694542

ABSTRACT:
A transmitter-receiver is disclosed for multichannel systems wherein a search for an idle channel is carried out with the help of a second intermediate frequency which is modulated with the station's own call number or with a call number not otherwise used in the system and which is injected into the receiver portion. If, during the channel search, a selective call receiver, adjusted to this call number, responds, the channel is determined to be idle because the additional IF voltage is higher than the IF noise voltage.

REFERENCES:
patent: 3426279 (1969-02-01), Berman
patent: 3443228 (1969-05-01), Brenner et al.
patent: 3535636 (1970-10-01), Muilwijk

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