Duplex diversity operation of vehicular mobile radio installation - comparing buffered radiotelephone reception quality signals for actuation of transistor-switched antenna selection relay

Duplex diversity operation of vehicular mobile radio installation - comparing buffered radiotelephone reception quality signals for actuation of transistor-switched antenna selection relay

Two receiving antennas (A1, A2) are connected selectively by a diversity relay (HT1) actuated by a transistor (T1). Voltages (U1, U2) representing the quality of their received signals are applied through buffer operational amplifiers (OP2, OP4) to a discriminator (OP3). Whichever antenna provides b...

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Bibliographische Detailangaben
Hauptverfasser: REICHMANN, PETER., 4650 GELSENKIRCHEN, DE, PAULUS, PETER. DR., 4400 MUENSTER, DE, SCHUENEMANN, UWE. DR., 4100 DUISBURG, DE
Format: Patent
Sprache:eng ; ger
Schlagworte:
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION
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Beschreibung
Zusammenfassung:Two receiving antennas (A1, A2) are connected selectively by a diversity relay (HT1) actuated by a transistor (T1). Voltages (U1, U2) representing the quality of their received signals are applied through buffer operational amplifiers (OP2, OP4) to a discriminator (OP3). Whichever antenna provides better reception is selected for the greater part of the time, and the other is switched-in only for the duration required for refreshment of the corresp. memory capacitor (C3 or C5) to the actual quality value. USE/ADVANTAGE - Esp. on motor vehicle, interference arising from different directional effects of individual antennas is suppressed and multipath fading is minimised.