Duplex transmitting-receiving station

Details Duplex transmitting-receiving station Duplex transmitting-receiving station

H - Electricity

04

B

325/22

H04B 7/00 (2006.01) B61L 25/04 (2006.01) H04B 1/50 (2006.01) H04B 1/40 (2006.01)

Patent

CA 1116698

ABSTRACT OF THE INVENTION DUPLEX TRANSMITTING-RECEIVING STATION A duplex transmitting-receiving station operates with frequency-shift keying (FSK) for the transmission of digital information. The transmitter section includes an FSK modulated oscillator (2) and the receiver section has a frequency conversion mixer (5) employing the transmitter oscillator (2) as local oscillator, and an FSK discriminator (7-13). In order to counteract the effect of the trans- mitter modulation on the received signal, the discriminator is provided with means (7-12) which vary the discriminator frequency in sympathy with the modulation of the oscillator. This can be achieved by electronic switching means (11,12) for switching of filters (7, 8, 9, 10) tuned to different frequencies, or by a second frequency conversion using an auxiliary local oscillator whose frequency is varied.

311702

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