This is a screen grab from my MacPro, running SdrDx (a heavily modified version of CuteSDR 1.00) with the RFSpace SDR-IQ receiver. The band is 20 meters, the antenna is a trapless (resonant) 20 meter inverted vee oriented east-west located in northeastern Montana, USA. Lots of USB signals evident; the tuning indicator shows 8 notches active on the fundamental and first 7 harmonics of 60 Hz. This helps with line noise. The capture is of an unreleased version of SdrDx running under OSX 10.5.8 (Leopard), but I expect to release it within a week or two. It's working well with Leopard and Snow Leopard. Lion has some bugs that cause a crash on exit (the bugs are definitely in Lion) so it's usable there, exit crash notwithstanding. I'm running "brick-wall" 2100 Hz bandwidth here, as a 100-2200 Hz span. Noise blanker is engaged (serious line noise issues, the noise blanker does a good job of eliminating them) otherwise you'd see (and I would hear) about another 10 dB of noise floor.
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