[Elecraft] K# and data modes

[Greg - AB7R]

In AFSK the K3 is already reading the mark frequency just as in FSK.  If you work 
someone in FSK and then chance to AFSK you should still be on the same freq.  This 
is because even in AFSK the radio is using the pitch combination so that you still 
have the dual peak filter available.  In AFSK you still need to make sure the K3 is 
using the same pitch tones as the soundcard software.  If the software is set for 
2125 and the K3 pitch AFSK is set for 915 you are not going to see very much 
output.  This is one of the more common issues when someone is having a problem 
with AFSK.

-------------------------
73,
Greg - AB7R
Whidbey Island WA
NA-065


On Thu Oct  1 11:55 , "Julian, G4ILO"  sent:

>
>
>
>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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