Radio communication apparatus capable of isolating a...

H - Electricity – 04 – B

Patent

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H04B 1/40 (2006.01) H04B 1/56 (2006.01)

Patent

CA 2102565

In a radio communication apparatus which uses a common carrier frequency on transmission and reception operations selectively carried out in the apparatus, a frequency divider is located between a modulator operated by a predetermined modulation frequency and a modulating local oscillator which oscillates a modulating frequency equal to an integral multiple N of the predetermined modulation frequency. The frequency divider has a frequency division factor equal to N and supplies a frequency divided signal of the predetermined modulation frequency to the modulator during the transmission operation under control of a control circuit. During the reception operation, the frequency divider is put into an inactive state by the control circuit to isolate the modulating local oscillator and the modulator.

Dans un appareil de radiocommunication qui utilise la même fréquence de porteuse pour les opérations d'émission et de réception effectuées de façon sélective, un diviseur de fréquence est monté entre un modulateur piloté par une fréquence de modulation prédéterminée et un oscillateur de modulation local qui oscille à une fréquence de modulation égale à un multiple entier N de la fréquence de modulation prédéterminée. Ce diviseur de fréquence a un facteur de division de fréquence égal à N et fournit un signal à fréquence divisée égale à la fréquence de modulation prédéterminée au modulateur durant les opérations d'émission sous contrôle du circuit de commande. Durant les opérations de réception, le diviseur de fréquence est rendu inactif par le circuit de commande pour isoler l'oscillateur de modulation local et le modulateur.

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