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For a
Telecommand (TC) to be effective, it must be compiled into a pre-arranged format (which may follow a standard structure), modulated onto a carrier wave which is then transmitted with adequate power to the remote system. The remote system will then demodulate the digital signal from the carrier,
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to process and complete the command. The strength of the transmitting LED can vary and determines the required positioning accuracy of the remote in relevance to the receiver. Infrared remotes have a maximum range of approximately 30 feet and require the remote control or transmitter and receiver to
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which did not require batteries and used ultrasonic technology. There are four aluminum rods inside the transmitter that produce high frequency sounds when they are hit at one end. Each rod is a different length, which enables them to produce varying sound pitches, which control the receiving unit.
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to the light-emitting diode (LED) usually located at the front of the remote. To transfer the information from the remote to the receiver, the LED turns the electrical signals into an invisible beam of infrared light that corresponds with the binary code and sends this light to the receiver. The
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sent to control a remote system or systems not directly connected (e.g. via wires) to the place from which the telecommand is sent. The word is derived from
149:). Systems that need remote measurement and reporting of information of interest to the system designer or operator require the counterpart of telecommand,
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decode the TC, and execute it. Transmission of the carrier wave can be by ultrasound, infra-red or other electromagnetic means.
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Often the smaller new remote controlled airplanes and helicopters are incorrectly advertised as radio controlled devices (see
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This technology was widely used but had certain issues such as dogs being bothered by the high frequency sounds.
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and it is transformed into an electrical signal for the command and is sent to the receiver’s integrated circuit/
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or not depending on the circumstances (in space, delay may be of days), as was the case of
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Ultrasonic is a technology used more frequently in the past for telecommand. Inventor
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To prevent unauthorised access to the remote system, TC
415:"How does an infrared remote control work? - Curiosity"
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438:. Inventors.about.com. 2012-04-09. Archived from
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436:"History of the Television Remote Control"
364:"HowStuffWorks "How Remote Controls Work""
333:. Novosti-kosmonavtiki.ru. Archived from
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177:Remote guidance of weapons or missiles
417:. Curiosity.discovery.com. 2011-07-07
16:Method of controlling a remote system
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396:. News.softpedia.com. 17 March 2008
394:"How Infrared Remote Controls Work"
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99:August 2012
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317:References
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137:= remote (
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311:Telemetry
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169:Examples
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