Heterodyne receiver and communication system with...

Details Heterodyne receiver and communication system with... Heterodyne receiver and communication system with...

2008-05-20

2008-05-20

Urban, Edward F. (Department: 2618)

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

C455S352000, C455S345000, C455S575900, C340S426160, C340S426200, C340S007330

Reexamination Certificate

active

11148281

ABSTRACT:
The heterodyne receiver includes an antenna, a local oscillator, a mixer mixing a signal received by the antenna with a local oscillation signal generated by the local oscillator to produce an IF signal, and a demodulator demodulating the IF signal. The local oscillator is configured to set a frequency of the local oscillation signal at such a frequency that a frequency of the IF signal becomes a predetermined intermediate frequency when any one of intended signals having frequencies within a predetermined frequency range is being received by the antenna, and to fix the frequency of the local oscillation signal at a predetermined oscillation frequency when any one of the intended signals is not being received by the antenna.

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