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1

I believe my problem is created by common-mode noise. I redesigned my homemade SA612 mixer. I isolated the antenna ground from the mixer ground, and I also isolated the mixer ground from the output RTL-SDR ground, and now the problem is fixed. Here's how I solved the problem. Since I only have very limited knowledge of electronics and radio, it may contain ...


2

The odd thing is it wasn't showing all memory used or excessive load (1.37) If I remember correctly, the Pentium IV is a single-core architecture with the option for Hyperthreading, which really is just one core with nearly two pipelines. Thus, a load > 1 is actually a heavy load. I would have estimated the load of an RTL-FM reception to be low, but ...


2

It looks to me like you've put a lot of effort into tracking this down. I believe you are on the right track as far as the Pi creating a lot of broadband noise. But I'm wondering if you've tried putting the SDR on a extension USB cable so that you can move it as far from the Pi as possible? I've found that getting farther from a noise source helps a lot. ...


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