[Elecraft] DATA A mode and WSJT-X

[david Moes]

I can duplicate the same effect here with my K3   uncheck the Flatten 
box at the bottom of the waterfall Flatten is for rigs that tend to have 
a hump in the middle of the audio  but with K3/KX3  which are flat to 
start this feature will have a negative effect

Flatten on http://i.imgur.com/eFN20vG.jpg

Flatten off  http://i.imgur.com/cpQoPEX.jpg


David Moes
President: Peterborough Amateur Radio Club.
dmoes at nexicom.net
VE3DVY,  VE3SD

On 1/23/2015 23:51, Edouard Lafargue wrote:
> I tried JT65 for the first time today (there is a first for everything,
> right?), and to my surprise, I discovered that for some reason, the DATA
> mode is not usable on that program!
>
>    Not 100% sure the mailing-list allows images in emails, so I will try to
> describe the issue as clearly as possible:
>
>      - In USB mode, with a flat EQ, I get a flat spectrum apart from the
> actual JT9/JT65 chirps, from 200Hz to 3000 Hz
>      - In DATA A mode, on the other hand, I get a peak around 100Hz, nothing
> until 300Hz, then a huge noise peak raising from 300Hz, peaking at 500hz
> and going slowly down to 1kHz. Then a big dip in signal/noise centered
> around 2kHz. In other words, very distorted signal!
>
>       Image speaks for itself: http://imgur.com/QyqpzEh
>
>        I am pretty sure this does not come from the radio, with a simple
> audio waterfall displaying at the same time in another program I don't see
> this artifact, but I wonder if anyone else has seen this and can explain
> it? Could it be an FFT artifact linked to the sampling rate of the
> soundcard and an internal sampling rate of the radio in DATA mode?
> Something else ??
>
>      Kind of scratching my head on this one, maybe smarter/more experience
> Hams on the list will have an answer!
>
>     Oh yes: WSJT-X is running on a Mac, not that it should really matter.
>
> 73 de Ed, W6ELA
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