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05-22-2006, 10:50 PM | #1 |
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How are rc control signals sent to reciever over the channel
Hello, I am REALLY wondering how these rc systems work. I have been looking online and cant quite nail it down. I am wondering how the control signal from the transmitter is actually getting to the reciever. I know the signal is encoded in the RF signal, but HOW? Is it like FM voice modulation where the frequency shift of someone speaking is encoded into RF such that the transmitted frequency is shifted up or down? With FM voice the transmitted frequency gets higher or lower very rapidly and that shift in frequency causes audio to come out on the other end. So HOW does the PPM or PCM signal from an RC transmitter get to the RC reciever and control the aircraft?
I am using the 50mHz band for some of my airplanes and I have other ham radios that can pick up that signal. I have been listening to my transmitted signals and just cant quite figure this out I know there is SOME kind of audible signal, thats what sparked me to use FM voice modulation as an example. Steve |
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05-23-2006, 06:33 AM | #2 |
RCC Master Contributor
I am: Bob H
Join Date: Oct 2002
Location: Mississauga, Ontario
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See these links for reference
http://webpages.charter.net/rcfu/Hel.../RadioOps.html PCM - http://en.wikipedia.org/wiki/Pulse-code_modulation PPM - http://en.wikipedia.org/wiki/Pulse_position_modulation http://zone.ni.com/devzone/conceptd....256EE4007354B2 Last, but not least Google - http://www.google.com/search?hl=en&l...dio+control%22
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Bob Hudson, MAAC 9709L |
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