Duplex microwave radio system

Details Duplex microwave radio system Duplex microwave radio system

H - Electricity

04

B

325/10

H04B 7/15 (2006.01) B61L 25/04 (2006.01) G01N 31/22 (2006.01) H03C 3/09 (2006.01) H04B 1/38 (2006.01) H04B 1/40 (2006.01) H04B 7/00 (2006.01)

Patent

CA 1113155

-1- ABSTRACT OF THE INVENTION DUPLEX MICROWAVE RADIO SYSTEM The invention concerns a duplex microwave radio system which serves to transmit analogue or digital data between mobile transmitting-receiving stations which move along given paths and fixed transmitting-receiving relay stations which are arranged at given intervals along these paths and operate in both directions of the path. The relay stations on a path are connected to a main, central transmitting-receiving station. Such systems are of use in, for example, railway systems. The invention provides that each mobile and/or relay station comprises a transmitting section including a microwave oscillator (3), frequency stabilisation and modulation means (4), and a receiving section including a microwave frequency- conversion mixer (5), an amplifier (6) and a demodulator, the output of the transmitting section and the input of the receiving section being connected to first and second arms of a circulator (7) having a third arm lying between the first two, the third arm being connected via a 3-dB coupler (8) to a pair of antennae means (9,10) whose radiation directions are offset by 180°, the arrangement being such that, in use, a signal from the microwave oscillator (3) passes, attenuated from the first to the second arm of the circulator (7) to provide a local oscillator signal for the mixer (5). (Figure 1)

311701

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