I am working FT8 and I got to thinking about this after stretching out the waterfall display as far as it would go (and blowing it up on a 49" screen)... I ran 160m last night and let the software run while I was off doing other things (just monitoring the band, not transmitting). I saw people working DX but I wasn't hearing DX. I was curious what band conditions would show over time. I let things run for probably 15 minutes then came back to it and scrolled through the decoded message list - just hearing NA (Canada and US). In any event, it got me thinking about what I was doing... I don't have any SDR radios (like a Flex), the closest I have is an Elecraft KX3 (my understanding is that it is an SDR - just with a box, display, buttons, and knobs). I also have a Yaesu FT-991A that has a spectrum and waterfall display - but it is very limited (there is 1 IF in that radio that splits out to the receiver/AF and the spectrum = the VFO governs both, you can't sweep the spectrum around the band while leaving the VFO in place live - you can do it paused, where the IF is feeding the AF at the VFO frequency while the band image on the display stays but you can't sweep the two independently live). While I was playing with the waterfall on FT8 I scrolled over to some SSB stations. The bandwidth on SSB is too wide to resolve in the AF spectrum - and the waterfall in WSJT is solely the AF through the soundcard. What I'd be curious about is if there are ways to create a long-term waterfall that can watch over a much wider frequency range at the IF level. Maybe this is a dumb question to those that have been running SDR radios for years and years - but is there software that you are aware of that will do this already? Are there as user-friendly ways of averaging noise and smoothing spectrum graph response rates? What I would like to do is record entire bands to see propagation and activity as an image. For example - on the low bands when the sun starts coming up the band noise increases, and the opposite - as the sun goes down the band noise decreases. Is there a type of waterfall display that will record this - say, over the course of 8-10 hours and not several minutes? As far as bandwidth goes - maybe up to 5-10MHz? I have a service monitor with a spectrum analyzer in it. I used to use it at one point for watching over a commercial band to find activity while I was surveying coordinated channel options. The spectrum analyzer will hold activity until you clear it. By using that function over a wide enough frequency range to get the list of channels in there and watching over a period of time it was possible to see where activity was, but only seeing the spectrum in one plane (an accumulation of data, not a time-base spread/distribution as a waterfall does) was very limited. For example - birdies, spurs, and other environmental artifacts would show up on the spectrum analyzer hold screen skewing the results. If those artifacts could be shown on a waterfall instead they would be very easily identified and skipped over. One antenna I use is a Tarheel model 400 screwdriver mobile antenna. It will load up 160m. I first noticed this on 160 but the spectrum and waterfall displays actually show the resonance of the antenna also. The bandwidth of the antenna is very narrow thus the sensitivity of the antenna on further frequencies adjacent to the resonant frequency fades off. You can visibly see that - best on 160 but 75/80 show it as well to some extent. So anyway - just thinking of waterfall displays here and what is possible to do. It's neat stuff!