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2 PC's - 1 causes noise 1 does not

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by drawhowz

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2 PC's on the same desk - 1 causes noise on radios in other rooms in the house, 1 does not. What could be causing this problem , and how do I solve it.

The PC that does not, is a 233 Mhz clone. The PC that does cause the noise on the radios is in a tower case and is an AMD 500 k6 processor. The cause of the noise problem has been isolated to the computer itself not the periperals or the monitor.

Can any one help me?

Thanks in advance.

5 replies

by sgt_shultz

well, i guess i would say that emi is leaking out of the tower pc. does the case look completely closed? does it have metal covers over all the unused slots? can you rig up a metal shield (cookie sheet?) and see if you can figure out where the emi is coming out? i wonder if an power line filter on the radio would help...

by timwalsh

There are numerous international agencies that regulate electronic emissions of electronic devices. Most use Class A and Class B designations.

Class A devices are devices that are designed for use strictly in a business or industrial environment. Class B devices must meet more stingent emissions tests to make them suitable for a residential environment.

All this is a long winded way of saying that my bet is that the noisy computer was probably not designed to meet Class B standards. The only way to bring into standards would be to replace all components that don't meet those standards. I would start with the power supply as it is probably the "noisiest" electronic component. The next step would be to replace the case with one that has proper shielding.

If you are interested, the following URL provides a list of the different regulatory agencies, the areas of the world they govern, and the pertinent regulations:

http://www.elotouch.com/support/agencies.asp

(remove any embedded spaces from the URL)

Hope this helps.

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