Transmitter for transmitting an FSK-modulated signal

Details Transmitter for transmitting an FSK-modulated signal Transmitter for transmitting an FSK-modulated signal

1982-09-27

1985-11-26

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 63, 332 9T, 455 41, H04B 500, H04L 2712

Patent

active

045557926

ABSTRACT:
A transmitter for transmitting FSK-modulated signals by way of an inductive aerial. A large frequency deviation, such as with FFSK-modulated signals, and a high transmission rate may cause the occurrence of a non-constant envelope. Electronic equipment arranged in the vicinity is then subjected to a greater degree of interference than with a small modulation depth and a low transmission rate. By generating in the transmitter an aerial current whose amplitude is inversely proportional to the frequency, tuning is not necessary to obtain a constant voltage envelope.

REFERENCES:
patent: 3095539 (1963-06-01), Bennett et al.
patent: 3812929 (1974-05-01), Farque
patent: 3934202 (1976-01-01), Missale
patent: 3939422 (1976-02-01), Deise
patent: 4083008 (1978-04-01), Eschke
patent: 4087755 (1978-05-01), LeGrand
patent: 4170764 (1979-10-01), Salz et al.
patent: 4199821 (1980-04-01), Munday
Mims, III, Engineer's Notebook II, Radio Shack, 1982, p. 114.
IEEE Transactions on Communications: Jun. 20, 1972, pp. 429-435.

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