Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1991-03-18
1992-09-15
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
455103, H04N 538
Patent
active
051482797
ABSTRACT:
A multi-channel microwave transmission system that employs a single antenna. A local oscillator set at a predetermined frequency provides a single to the local oscillator port of a mixer; the signal first passes through a narrow bandpass filter. The input port of the mixer receives a signal carrying fifty television channels; a microwave absorption filter and a bandpass filter positioned between the source of the multi-channel signal and the input port prevent the predetermined local oscillator frequency from intermodulating the multi-channel signal. A bandpass filter having a notch that rejects the predetermined local oscillator frequency is positioned between the output port of the mixer and the power amplifier stage of the device. In the power amplifier stage, another bandpass filter having a notch rejecting the predetermined frequency of the local oscillator is provided. The power amplifier stage feeds an inexpensive parabolic antenna of the type sold in retail outlets. The mixer converts the incoming television signals to microwave frequencies using the superheterodyne principle.
REFERENCES:
patent: 3987396 (1976-10-01), Kreger
patent: 4262361 (1981-04-01), Hauer
patent: 4475242 (1984-10-01), Rafal et al.
Groody James J.
Mason, Jr. Joseph C.
Powell Mark R.
Smith Ronald E.
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