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About RF Receivers
RF receivers are electronic devices that separate radio signals from one another and convert specific signals into audio, video, or data formats. RF receivers use an antenna to receive transmitted radio signals and a tuner to separate a specific signal from all of the other signals that the antenna receives. Detectors or demodulators then extract information that was encoded before transmission. There are several ways to decode or modulate this information, including amplitude modulation (AM) and frequency modulation (FM). Radio techniques limit localized interference and noise. With direct sequence spread spectrum, signals are spread over a large band by multiplexing the signal with a code or signature that modulates each bit. With frequency hopping spread spectrum, signals move through a narrow set of channels in a sequential, cyclical, and predetermined pattern.
Selecting RF receivers requires an understanding of modulation methods such as AM and FM. On-off key (OOK), the simplest form of modulation, consists of turning the signal on or off. Amplitude modulation (AM) causes the baseband signal to vary the amplitude or height of the carrier wave to create the desired information content. Frequency modulation (FM) causes the instantaneous frequency of a sine wave carrier to depart from the center frequency by an amount proportional to the instantaneous value of the modulating signal. Amplitude shift key (ASK) transmits data by varying the amplitude of the transmitted signal. Frequency shift key (FSK) is a digital modulation scheme using two or more output frequencies. Phase shift key (PSK) is a digital modulation scheme in which the phase of the transmitted signal is varied in accordance with the baseband data signal.
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Engineering Web: RF Receivers
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RF Transmitters/Receivers Information | Business.com RF Transmitters/Receivers Home » Directory » Electronics & Semiconductors » RF See Business.com, Inc. Information |
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RF Micro Devices :: RF Solutions & Wireless Communication... Optical Receivers Power Doublers Push-Pull Amplifiers General Purpose RF Overview Amplifiers (Broadband, General Purpose) See RF Micro Devices, Inc. (RFMD) Information |
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RF Video > Applications : Tektronix The problem could be caused by MPEG table errors, or merely from the RF power dropping below the operational threshold or the "cliff" point. See Tektronix, Inc. Information |
