kzam11 Posted April 3, 2005 Report Share Posted April 3, 2005 i want project FSK TX Quote Link to comment Share on other sites More sharing options...
Kevin Weddle Posted April 3, 2005 Report Share Posted April 3, 2005 I believe FSK is what they use for the internet. It involves the presence of a frequency to indicate a bit. Actually a block of known data is converted to a frequency. Sometimes two different frequencies are used to indicate a 1 and 0. I don't know that you could use a PLL because they are often written to as to the frequency of the carrier. This writng procedure is costly with repect to time. A VCO by itself is not accurate enough. Depending on the type of FSK used, I would just use two oscillators that are enabled by a transistor that is selected to output the frequency. Quote Link to comment Share on other sites More sharing options...
audioguru Posted April 3, 2005 Report Share Posted April 3, 2005 Frequency Shift Keying: 2 frequencies, one is a logic high and the other is a logic low.Google has 295,000 articles about it. ;D Quote Link to comment Share on other sites More sharing options...
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