If you have a computer software showing a waterfall, and you have a rig that also shows a waterfall, which would you trust for adjusting the squelch? Are they all supposed to be 'about the same'? I've run into this issue with waterfalls on both Fldigi and JT modes, and between these waterfalls and a rig waterfall as well (on my 'Elmer's rig, not mine). Normally I adjust the squelch in Fldigi while tuned on the JT segment (7.076 for example) then open a JT program, not adjusting this program's squelch. If I get a clean Fldigi waterfall, just opening up the JT one, I notice it doesn't look as clean. Procedurally I just ignore the JT one. Does the waterfall on the program you're using for RX need to be the one you are adjusting the noise level for? It is always possible this newbie is doing something wrong. Maybe it shouldn't even be different, or I've got a setting off. My 'Elmer has a rig waterfall and also runs digital modes. So which waterfall should he adjust the noise levels for? I would think with weak-signal modes even a small difference could be significant. But for SSB/CW, he/I wouldn't use a computer, so there wouldn't be a conflict. We'd just use the rig one.