Otherwise, what I'm seeing makes sense in terms of the experiments I'm carrying out, which wasn't the case with Touchstone Pro. I can also see the radio stations in the FM broadcast band and there's nothing I can do about that without a radio-proof room. It is well known that the Realtek RTL2832U hardware dongle produces signals at 28.8 MHz and its harmonics and I can see these clearly. I discovered this when I found RTLSDR Scanner, which produces a spectrum that I can explain in every detail.
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To cut a long story short, Touchstone Pro is making some bad mistakes in the signal processing and the output spectrum is polluted by artifacts that are not actual input signals. I started with RF Viewer and Touchstone Pro from NutsAboutNets. He did not fund an EMI study in the first place and is reluctant to spend money now on equipment, but I hate just guessing so I'm trying to put together a simple EMI evaluation setup on my own nickel. I got into this low-cost spectrum analyzer thing because a client of mine wants to reduce the EMI (electro-magnetic interference) from a product I designed. I did have installation problems and it took a lot of effort to get around that, but the author was helpful. This is an excellent application specifically it does exactly what it claims to do whereas the commercial program, Touchstone Pro, is seriously broken.
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