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sorry if this is in the wrong category, not sure where to put it.

I am currently having what seems to be an interference issue with my PC.

First i noticed quite a high amount of packet loss (>2%) using my PCie wireless adapter when pinging my wifi router. This lead to me thinking that my pcie card is defective. I then bought a cheap usb wifi dongle.

Now the weird thing with this is that when i use it in the back of my pc case where the mobo usb ports are i get the same or higher amount of packet loss. But when i use it in the front usb port that is on my pc case i get less than 1 percent packet loss.

I don't know much about electricity but i got this multimeter that has a NCV feature which stands for non contact voltage detector. It basically has two claws that you can put around a wire to see if it has current flowing trough it. It seems to also detect static electricity. If i rub the claw on synthetic clothing it starts to beep.

So i decided to test this on my pc case and yes it starts beeping. Now i don't know if this is normal or not for pc's to have an electrical field but this most certainly has an effect on my wifi performance. Another thing to note is that when i use the usb wifi dongle with my laptop there is almost no packet loss (4 packets lost of the 33000 let it run all night).

I'm using a cheap surge protector/voltage regulator at the moment. The brand is FORZA. Im thinking that this could be an electricity/psu/mobo issue.

The Pc used to shock me a bit when it was plugged in a non grounded outlet but it's grounded now. Does that mean my mobo is touching the metal casing or something?

any ideas?
 

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computer parts put out a decent bit of electromagnetic interference. THey have features called Spread Spectrum that "shakes" the frequency +/- a few decimal places from your targetr so that the power of the EM is diluted a little bit and is not concentrated on a single frequency.

As for voltage on the tower, no that isnt really normal. That would mean you have a grounding problem. Since you mentioned the PC did not used to have a ground connection and now it does, I would have to guess your house's electrical has issues and is not wired to modern standards well enough. Any power filtering done in the PSU and power strips and all that will have capacitors and resistors between line and ground, and if ground has issues then the whole thing will have issues.
 
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