[Elecraft] DATA A mode and WSJT-X

[Matt Zilmer]

And JT9 is even worse (addictive).  If you're a QRP junkie, there's
nothing like a 500 mW contact, halfway around the world.

73,
matt
W6NIA

On Sat, 24 Jan 2015 15:58:20 +0000 (UTC), you wrote:

>Be Careful with JT-65 it can be addicting
>I have nearly every state on every band from 160-10 (and a number of them on 6)
>Plus 104 countries (some on nearly every band as well)
>And it all started from me just "trying" it one day.
>
>
>
>
>
>
>      From: Edouard Lafargue <edouard at lafargue.name>
> To: Mark <elecraft at mailman.qth.net> 
> Sent: Friday, January 23, 2015 11:51 PM
> Subject: [Elecraft] DATA A mode and WSJT-X
>   
>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
>______________________________________________________________
>Elecraft mailing list
>Home: http://mailman.qth.net/mailman/listinfo/elecraft
>Help: http://mailman.qth.net/mmfaq.htm
>Post: mailto:Elecraft at mailman.qth.net
>
>This list hosted by: http://www.qsl.net
>Please help support this email list: http://www.qsl.net/donate.html
>Message delivered to hlyingst at yahoo.com
>
>
>  
>______________________________________________________________
>Elecraft mailing list
>Home: http://mailman.qth.net/mailman/listinfo/elecraft
>Help: http://mailman.qth.net/mmfaq.htm
>Post: mailto:Elecraft at mailman.qth.net
>
>This list hosted by: http://www.qsl.net
>Please help support this email list: http://www.qsl.net/donate.html
>Message delivered to mzilmer at roadrunner.com
Matt Zilmer, W6NIA
--
"Give me six hours to chop down a tree and I will
spend the first four sharpening the axe." -A. Lincoln