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392:, and the use of channel 3 overall was mostly confined to medium or smaller markets. The choice allowed the user to select the unused channel in their area so that the connected device would be able to provide video and audio on an RF feed to the television without excessive interference from a broadcast signal.
180:, TVs were designed to only accept signals through the aerial connector: signals originate at a TV station, are transmitted over the air, and are then received by an antenna and demodulated within the TV. When equipment was developed which could use a television receiver as its display device, such as
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Modulating a TV signal with stereo sound is relatively complex; most low-cost home TV modulators produce a signal with monaural audio. Even some units that have two or more audio inputs simply combine the left and right audio channels into one mono audio signal. Some used on very early home computers
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Multi-channel RF modulators are commonly used in home audio/video distribution. These devices have multiple audio and video inputs and one RF output. Audio/video outputs from source devices such as a DVD player, VCR, or DSS receiver are connected to the audio/video inputs on the modulator. The
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Other countries had the RF output for video equipment on different groups of frequencies. For example, equipment sold in Europe, South Africa and Hong Kong used UHF channels 30–39 for this purpose. Equipment sold in Japan used channel 1 or 2 (Channel 13–16 is for cable converters). With other
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modulator is then programmed to broadcast the signals on a certain frequency. That RF broadcast is then received by the connected TV. When the TV is tuned to the programmed channel, the video and audio signal of the source device is accessed. RF modulation can become difficult in a
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video game consoles commonly used this method to connect to the television, which was used as the audio and video device for the game. In many cases, an RF modulator was used to take the composite output from the game and modulate it before sending the signal to the television.
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RF modulators operate on different channels depending on the region and have been integrated into various home electronics. However, they tend to produce lower image quality than a baseband connection due to losses during the modulation and demodulation process. In professional
415:); in this case unless the viewer received cable television service where either channel could be chosen, they would have to tune to the channel with less power to their set, an alternate input, or use an alternate modulator which instead modulated on a different channel.
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Some systems were supplied with an external modulator unit that connected to both the system and to the antenna jacks of a television. One reason for this is that a device which outputs an RF signal must in general be certified by regulatory authorities—such as the U.S.
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jacks, which skip the modulation and demodulation steps, modulators are no longer included as standard equipment, and RF modulators are now largely a third-party product, purchased primarily to run newer equipment such as DVD players with an old television set.
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due to the added device. In some cases the antenna input is always passed through, while in other cases the antenna input is turned off when the device is outputting a signal, and only the device signal is sent onward, to reduce interference.
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system. High pass, low pass, and notch filters must be used to block certain frequencies, or channels, so that the modulator can broadcast the audio/video signal of the source device on that channel.
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radio signal that is played through the car radio. Car FM modulators suffer from loss of quality and interference issues. Later devices which would use these types of modulators would be
495:"Professional" modulators such as those used in the CATV industry generally include vestigial sideband filtering which is generally absent on "consumer" grade modulators.
454:(FCC) — and thus by having an external RF modulator, only the modulator itself needed to be certified, rather than the entire video game system. One example was the
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RF modulators produce a relatively poor picture, as image quality is lost during both the modulation from the source device, and the demodulation in the television.
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Recently, some RF demodulators have been marketed on obscure online markets to allow channel 3 inputs from legacy devices to work on RCA composite in.
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or other composite AV source, and generate a broadcast RF signal that can be fed into a television's aerial/coaxial connector.
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typically shipped with a modulator allowing for use on analog channels 3 and 4. This channel option was provided because
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Both channels being in use and receivable were rare and confined to the outskirts of markets (for instance, channel 3,
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channels being used for RF modulation function in other regions, channel 3/4 output is a misnomer for those regions.
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RF modulators are commonly integrated into VCRs, in video game consoles up to and including the
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to a format that can be handled by a device designed to receive a modulated RF input, such as a
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Device which converts video signals to the format used by over-the-air RF broadcasts
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without requiring dashboard hardware upgrades. For example, a portable CD player's
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had no sound capability at all. Most cheaper modulators (i.e. not intended for
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RF modulators may also be used to take the audio and video signal from a
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Audio RF modulators are used in low-end car audio to add devices like
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The aerial connector is standard on all TV sets, even very old ones.
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725:"How to Connect Your Old School Video Game Consoles to a New TV"
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is connected to the modulator, which outputs a low-power
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3 and 4 were rarely assigned in the same market due to
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radio-electronics.com - NFC Modulation & RF Signal
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may be used, as required by the receiving equipment.
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It also is common to have this type of RF output on
335:RF modulation puts the desired information on to a
144:settings, more sophisticated modulators are used.
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537:. Unsourced material may be challenged and
287:. Unsourced material may be challenged and
601:Learn how and when to remove this message
307:Learn how and when to remove this message
172:Prior to the introduction of specialised
69:Learn how and when to remove this message
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716:
696:"Memories of Analog TV: The 90s and 00s"
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32:This article includes a list of general
753:radagast.org - Modulation and Deviation
232:Since later television designs include
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377:Consumer audiovisual devices sold in
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535:adding citations to reliable sources
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285:adding citations to reliable sources
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38:it lacks sufficient corresponding
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452:Federal Communications Commission
723:Henry, Alan (October 11, 2013).
670:Servicing Satellite TV Equipment
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411:being both available in eastern
362:TV modulators generally feature
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694:Tanny, David (April 22, 2009).
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92:modulator, top cover taken off
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339:at a standardized frequency.
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128:signal, which is used to
124:receiver. Its input is a
102:radio frequency modulator
643:List of video connectors
434:Cable TV Agile Modulator
323:RF modulator inside the
204:video cassette recorders
673:. Newnes. p. 119.
442:, and in 8- and 16-bit
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53:more precise citations.
773:Audiovisual connectors
631:portable media players
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327:manufactured in 1984,
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778:Consumer electronics
531:improve this section
345:frequency modulation
281:improve this section
667:Beer, Nick (1998).
458:, designed for the
383:television channels
212:video game consoles
194:video game consoles
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401:Madison, Wisconsin
364:analog passthrough
357:vestigial sideband
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176:standards such as
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732:. Retrieved
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703:. Retrieved
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629:and similar
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160:of an early
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98:RF modulator
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59:January 2008
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648:Transmitter
615:CD changers
359:filtering.
186:DVD players
166:Microtan 65
158:motherboard
51:introducing
767:Categories
729:Lifehacker
654:References
561:newspapers
224:- through
122:television
34:references
591:July 2023
518:does not
456:Sup'R'Mod
409:Milwaukee
341:Amplitude
268:does not
234:composite
142:broadcast
637:See also
460:Apple II
188:, early
136:source.
130:modulate
126:baseband
88:UM 1286
575:scholar
539:removed
524:sources
405:WTMJ-TV
397:WISC-TV
355:) lack
289:removed
274:sources
238:S-Video
148:History
47:improve
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331:system
249:Design
240:, and
192:, and
164:, the
36:, but
627:iPods
582:JSTOR
568:books
222:First
178:SCART
118:radio
86:ASTEC
736:2016
707:2016
675:ISBN
554:news
522:any
520:cite
490:CATV
471:NTSC
426:Uses
403:and
272:any
270:cite
182:VCRs
156:The
112:and
110:VCRs
533:by
482:YUV
478:RGB
469:or
467:PAL
399:in
343:or
329:PAL
283:by
208:DVD
120:or
96:An
90:UHF
769::
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715:^
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623:FM
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