August 19, 2012

Power supply quality impact on RF noise

I suspected that the PSU that came with the MK802 generate a bit of noise so I decided to compare it with a high quality PSU. Measurements with an oscilloscope on the USB port power line indicated that it seem to be true. So I prepared some python scripts to collect RF data from my RTL-SDR device to see how it affected the RF noise. The plot below shows the result. Red is the original power supply for MK802 and the blue is a "Nordic Power" high quality power supply. As seen it does get a few dB better with high quality power supply.

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