My KX3 is connected to my computer through a SignaLink USB device. I only operate digital modes, either with fldigi or wsjt-x, and always in DATA-A mode. The waterfall display in both these programs shows a pronounced increase in levels at the low and high ends of the audio passband. So much so that the background noise goes into "yellow", or even "red".
A picture of this is at http://imgurl.org?di=5S2I That was taken with no antenna connected at all, VFO at 14070, in DATA-A mode. Bandwidth was set to 4kHz. The radio has the ATU and roofing filter options installed. Since DATA-A is supposed to disable all equalization and compression, I thought at first that the SignaLink was introducing this, but if I use the PBT knob to descrease the bandwidth to 2 kHz, the "yellow" regions move toward the center - though the effect is most pronounced whan the BW is 4kHz. This makes me think it is an artifact of the DSP algorithms. If I change the mode to SSB so I can re-enable RX EQ, I can dial-down the ends a bit. Also notice that outside of the silent region just outside the chosen bandwidth, the noise level rises again. This is not generally a problem so far. Is this expected behavior? It makes it difficult to see signals that fall toward the ends of the passband. In extreme cases I retune the VFO to make them fall in the center. ______________________________________________________________ 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
