RF modulator
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An RF modulator is an electronic device used to convert signals from devices such as media players, VCRs and game consoles to a format that can be handled by a device designed to receive a modulated R
ASTEC UM 1286 UHF modulator, top cover taken off
The motherboard of an early microcomputer, the Microtan 65, showing the silver-cased ASTEC 1111EM36 UHF TV modulator at top left
RF modulator inside the Commodore 64 manufactured in 1984, PAL system
Signal modulation
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Signal modulation is the process of varying one or more properties of a periodic waveform in electronics and telecommunication for the purpose of transmitting information.
RF modulator
…handled by a device designed to receive a modulated RF input, such as a radio or television receiver. Its input is a baseband signal, which is used to modulate a radio frequency source. RF modulators operate on different channels depending on the region and have been integrated into various home electronics…
Waterfall plot of a 146.52 MHz radio carrier, with amplitude modulation by a 1,000 Hz sinusoid. Two strong sidebands at + and - 1 kHz from the carrier frequency are shown.
A carrier, frequency modulated by a 1,000 Hz sinusoid. The modulation index has been adjusted to around 2.4, so the carrier frequency has small amplitude. Several strong sidebands are apparent; in principle, an infinite number are produced in FM, but the higher-order sidebands are of negligible magnitude.