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khgsm2007 said:hi again
thank u very much every one , actually ur links & info are very helpfull
But i have remote car switch , iam trying to understand the way it operates, It uses HT12E as digital data Encoder & one transistor as transmitter
is that FSK technique , if so how the transmitted data rescieved & decoded.
any help will be appreciated
Thanx in advance
BR
audioguru said:Remember using a modem on a telephone line to access the internet?
An old modem used FSK between two or more audio frequencies.
My first modem was 14.4kB/sec and I could hear it alternate between two frequencies. A 56k modem sounds like a lot of noise.