Posted: 7/16/2013 7:42:05 AM EDT
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Is FSK just pertinent to RTTY? Do all the other encoding methods require AFSK?
ETA: I ask this because Im a bit confused in regards to what is actually going on. i *think* that RTTY can use FSK because its just a stream of 0s and 1s over the computers interface pretty much directly to the air interface of marks and spaces, whereas the other modes that use multiple tones require AFSK for those multiple tones? |
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FSK could be used for all digital modes, but AFSK is easier especially when the mode uses multiple tones like Olivia etc..
The problem using FSK for multiple tone modes is that the rigs don't support it. I suppose a guy could build or modify a rig to support multiple tone digi-modes...but why when AFSK works just fine. 
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Quoted:
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I suppose a guy could build or modify a rig to support multiple tone digi-modes...but why when AFSK works just fine. Because it might lead to the next breakthrough in Amateur data communication. You never know. The TS 480 has filters built in for digital modes with center frequencies at 1000Hz, 1500 Hz, and the standard RTTY shift and tones. FSK means literally shifting the frequency of the transmitter to "generate" the tones in the receiver. FSK used to be the best way to keep the digital signals pure, It was very easy with older rigs to over drive the AFSK tones and splatter. In my TS 480 I keep the "B" menu settings for digital work and the "A" menu for SSB and CW. HTH 73, Rob |