[Elecraft] K# and data modes

[Julian, G4ILO]

Mike-39 wrote:
> 
> 
> 
> Hi Julian -
> 
> Direct keying = FSK
> Audio keying = ASFK
> 
> See http://www.aa5au.com/gettingstarted/rtty_start_intro.htm for some 
> pro/con arguments re: RTTY. I've always used FSK, so it's my preference 
> not to change. I also don't want to deal with the offset between SSB and 
> FSK. Or does the K3 deal with that internally?
> 
> I'm not too sure about the PSK31 scheme either.
> 
> 

I took a look at that article, and it seems to me that the K3 negates all
the arguments it raises against using AFSK. The K3 has a dedicated data mode
so you don't need to worry about disabling compression and switching the
audio source, that's done automatically, and it does let you use narrow
filters on receive. Furthermore it's very easy to set up the audio drive
level so you would have to try very hard to overdrive the TX and produce a
distorted signal.

I'm not sure what you mean about the offset between SSB and FSK. Personally
it has never bothered me that the display is reading the suppressed carrier
frequency while I'm operating somewhere 400 - 2400Hz higher. But in fact
just about all of the sound card software will add the audio frequency on to
the dial frequency so it will log the exact frequency anyway.

-----
Julian, G4ILO. K2 #392  K3 #222.
* G4ILO's Shack - http://www.g4ilo.com
* KComm - http://www.g4ilo.com/kcomm.html
* KTune - http://www.g4ilo.com/ktune.html

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