[Elecraft] K3 DATA A vs USB for JT65/JT9

[Mike Reublin NF4L]

Per page 31 of the K3 owners manual sez....

DATA A can be used for all audio-shift transmission modes, including AFSK and PSK-31. VFO A shows the transmit suppressed carrier frequency and USB is normal for DATA A. Compression is automatically set to 0 to reduce transmitted signal distortion.

AFSK A is also an audio-shift transmission but is optimized for RTTY. VFO A displays the RTTY mark frequency and LSB is normal. The built-in text decoder and the dual-passband RTTY filter can be used.

73, Mike NF4L
 
> On Mar 17, 2015, at 12:41, Fred Jensen <k6dgw at foothill.net> wrote:
> 
> Can you 'splain the difference between AFSK and DATA A?  I have been running RTTY in AFSK using MMTTY and the sound in/out from my "radio laptop."  Just two stereo cables using LINE IN/OUT on the back of the K3, no other interface hardware.  VOX for PTT.  It seems to work fine, am I missing something?
> 
> 73,
> 
> Fred K6DGW
> - Northern California Contest Club
> - CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015
> - www.cqp.org
> 
> On 3/16/2015 7:55 PM, Don Wilhelm wrote:
>> Sam,
>> 
>> You are doing it right.
>> 
>> DATA A mode is like SSB with the following exceptions:
>> 1) TX EQ is disabled in DATA A mode
>> 2) Audio compression is disabled in DATA A mode.
>> 3) one can set the audio input to LINE IN for DATA A mode - no need to
>> change it from MIC audio when using data modes.
> 
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