Jörg in the Elecraft KX3 group on Facebook had an interesting observation: with WJST's waterfall, if the "flatten" mode is on, it produces some unusual artifacts in the presence of sharp spectrum drop-offs, and indeed if I turn off the "flatten" feature and manually set the zero point for the waterfall, the artifacts go away.
It's still an open question as to why the data-a mode has a steep drop-off at 400Hz when the PBT settings on the rig would seem to indicate otherwise, and the same drop-off isn't there in USB mode. I see searching on "400 Hz" that GM4JJJ had the same question here on the last back in July 2015, but never really got an answer. I basically have the same question as this one: https://www.mail-archive.com/elecraft@mailman.qth.net/msg183837.html Nick On 2 January 2017 at 12:06, Nicklas Johnson <n...@n6ol.us> wrote: > I'm seeing some unexpected audio artifacts when using DATA A mode with the > latest production firmware on my KX3, on all bands. This is something I > observe when the PBT BW is set all the way wide (4KHz) and FC is centered. > > In DATA mode, there's an audio drop-off between 200 and 325 Hz, with an > almost completely dead audio "hole" between 250 and 300 Hz. Then there's > some additional noise between 350 and 500 Hz. > > If I switch to USB mode (with no EQ or audio effects applied, naturally), > all of these artifacts go away, and it's perfectly smooth across the > spectrum. No drop-off, no noise. > > Pictures of the waterfalls for comparison here: http://imgur.com/a/AjHu4 > > Am I doing something wrong, or is there something I should check? I've > taken the usual steps, but it's plausible I've missed something. > > Nick > > -- > *N6OL* > Saying something doesn't make it true. Belief in something doesn't make > it real. And if you have to lie to support a position, that position is not > worth supporting. > -- *N6OL* Saying something doesn't make it true. Belief in something doesn't make it real. And if you have to lie to support a position, that position is not worth supporting. ______________________________________________________________ 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
