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@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 arch...@mail-archive.com