Hand-held transmitter for the emission of coded electromagnetic

Details Hand-held transmitter for the emission of coded electromagnetic Hand-held transmitter for the emission of coded electromagnetic

1988-02-05

1989-10-31

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

340825320, 34082557, 341176, 455 91, H04B 102

Patent

active

048780529

ABSTRACT:
The invention relates to a hand-held transmitter and a receiver tuned to e.g. for remote control of garage doors, the transmitter consisting of a current/voltage supply (100), a coding unit (200) generating coded electromagnetic pulses and with an adjustable code, a pulse shaper (300), an HF oscillator (400), an HF output stage (500), a filter (600) and an antenna (700). In order to simplify the construction of such a transmitter, it is suggested according to the invention that the oscillator (400) comprise a circuit which enables a reliable oscillation build-up pattern in a relatively wide range of frequencies around the rated frequency and that the filter (600) connected between the output stage (500) and the antenna (700) be a steeply flanked low-pass filter.

REFERENCES:
patent: 3854094 (1974-12-01), Towler
patent: 4063410 (1977-12-01), Welling
patent: 4485382 (1984-11-01), Moore
patent: 4590471 (1986-05-01), Pieroway et al.
patent: 4771440 (1988-09-01), Fromm

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