Telecommunications – Receiver or analog modulated signal frequency converter – With wave collector
Patent
1980-02-25
1982-02-23
Bookbinder, Marc E.
Telecommunications
Receiver or analog modulated signal frequency converter
With wave collector
455134, 455135, H04B 708
Patent
active
043172296
ABSTRACT:
A plurality of horizontally directive antenna sectors are arranged in a configuration to receive signals from remote transmitters over a given angle in the horizontal plane. A scanning system is operative in one of several modes to sequentially couple each sector to a receiver. In its first mode, each sector is sequentially scanned with the peak signal level therefrom being compared to a reference level. If the signal level on any sector exceeds the reference level the scanner activates to its second mode wherein scanning of all sectors continues for a predetermined interval after which the system advances to a selective scanning mode wherein scan is limited to that sector with the largest stored signal level relative to the reference level, and to those sectors adjacent said sector for a predetermined time interval. At the end of this interval, scanning is inhibited and the receiver is coupled to that sector which exhibited the strongest relative signal level during the scanning sequences. In this listen mode, if the signal level from the sector falls to a minimum level or a coded squelch is undetected for a given period, the system reverts to the first scanning mode.
The system periodically updates the reference levels to account for changes in background noise or the presence of an interfering signal.
REFERENCES:
patent: 3206679 (1965-09-01), Miller
patent: 3537011 (1970-10-01), Escoula
patent: 3670275 (1972-06-01), Kalliomaki et al.
patent: 4101836 (1978-07-01), Craig et al.
patent: 4255740 (1981-03-01), Ferrie
Craig Timothy P.
Erickson Paul M.
Stimple James R.
Bookbinder Marc E.
Gillman James W.
Motorola Inc.
Scheer James A.
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