Radio communications systems

Details Radio communications systems Radio communications systems

1980-01-22

1981-09-15

Bookbinder, Marc E.

Telecommunications

Transmitter and receiver at separate stations

Distortion, noise, or other interference prevention,...

455 98, 455108, 455118, H04B 100

Patent

active

042901448

ABSTRACT:
A radio communications system for aircraft, particularly useful at UHF frequencies and in aircraft travelling at high speed and low level where rapid phase and amplitude fluctuations degrade intelligible speech transmission. The system comprises a transmitter in a first aircraft, the transmitter including an upshift frequency translator for transferring the frequency band of an input signal from a microphone to a higher band, and further including an amplitude modulator for modulating the frequency translated signals; and a receiver in a second aircraft arranged to receive and demodulate the transmitted signals, the receiver including a high pass filter for removing noise from the demodulated signal, and a downshift frequency translator for transferring the frequency band of the filter output to a lower band.

REFERENCES:
patent: 1841142 (1932-01-01), Mathes
patent: 3492580 (1970-01-01), Berman
patent: 3803490 (1974-04-01), Almering et al.

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