Raspberry Pi make RF Noise?!

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Hi
I have a huge problem. I will run some Raspberry Pi 2 with an SDR over the Network Software.
I try some but when I power up an Pi the noise level increase dramatically.
So what do I wrong? My Pc is running 24/7 and generate an small amount of noise.
 

n9mxq

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Are you sure it's the Pi, and not the USB power supply used to power it? Short of building a metal case for the Pi (properly insulated and grounded) you probably won't find much commercially.
 

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The Pi is in an Metal Case. What kind of Power supply is recommend?
 

n9mxq

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Brand name. Good quality. Stay away from the cheap stuff. Whatever is best in your area.. I've found that 2a supplies from cell phones are usually fairly quiet. The ones that come with the phone. Not aftermarket.

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I have a Plug from my Tablet but the are the same crap.
How about some cheap bench power supply?
 

n9mxq

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If it's a quality supply with filtering.

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