Frequency division duplex transmitter which attenuates the diffe

Details Frequency division duplex transmitter which attenuates the diffe Frequency division duplex transmitter which attenuates the diffe

1996-05-24

1999-03-09

Olms, Douglas W.

Multiplex communications

Duplex

Communication over free space

455 91, 455 24, H04J 100, H04B 140

Patent

active

058810544

ABSTRACT:
Intermediate frequency Fif output from a first frequency mixer passes through IF filter which attenuates a noise level at a frequency of a difference between receiving frequency Frx and output frequency FL2 from a second local oscillator to a level such that the a transmitting noise produces no receiving sensitivity suppression, whereby the intermediate frequency becomes one that possesses a sufficiently low noise level compared to a sensitivity level of a receiver. After the intermediated frequency is converted to a transmitting frequency by a second frequency mixer, in the intermediate frequency which increases its noise level by a gain obtained by the circuit components disposed behind first frequency mixer, a receiving band noise is removed by a transmitting filter having an attenuation amount at a receiving band equal to the gain obtained by the circuit component disposed behind the first frequency mixer.

REFERENCES:
patent: 5475677 (1995-12-01), Arnold

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