Telecommunications – Transmitter and receiver at separate stations – Frequency or phase modulation
Patent
1989-05-12
1991-08-20
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
Frequency or phase modulation
455339, 333168, H04B 700, H03H 712
Patent
active
050420852
ABSTRACT:
The RF data communication band pass filter is a fixed device that filters both RF multi-level data signals and binary-level data signals. The RF data communication band pass filter comprises a low pass filtering means having a corner frequency of approximately 2900 Hertz and as high pass filtering means of approximately 340 Hertz. By using precision components the overall group delay envelope is such that both multi-level RF data signals and binary-level RF data signals are adequately filtered without substantial harmonic distortion or spectral distortion. In addition, the communication band pass filter meets the strictest of international RF data communication requirements.
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patent: 4437075 (1984-03-01), Darmouni
patent: 4481489 (1984-11-01), Kurley
patent: 4581750 (1986-04-01), Dreleman
patent: 4646305 (1987-02-01), Tretter et al.
patent: 4714905 (1987-12-01), Bernstein et al.
Charouel Lisa
Eisenzopf Reinhard J.
Krause Joseph P.
Markison Timothy W.
Motorola Inc.
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