Ken;

EMI can be a serious problem. The device in question works at about 27 mHz, and transmits EMI at multiples of the transmitting frequency as well at the fundamental frequency.

Germany has strict laws about EMI and such matters are controlled by the Post Office. Electric Razors and model trains can cause EMI. In the United States the FCC regulates emission of these types, but is very lax in comparison to Germany.

Computers cause EMI due to switching power supplies, and internal circuitry (gates, etc.). My previous background was in military air to ground transmitters and receivers, and data link computers, electronics engineering under NASA and commercial broadcasting, and we measured all these parameters and more. As a Radio Amateur (WA6FCO)since 1958, I am well acquainted with EMI. Also, I had a First Class FCC Radio Telephone License (now called a General License) and was a Chief Engineer at a radio and television station. Now there is a source of EMI! :)

Keep the CB, its output cable and antenna away from computers and computer network components and cables. :)

Here is a hint about coaxial cable such as is used on CB transceivers: It attenuates RF by about –40 db. It works as a radiator in the real world and can be a serious issue. So if the coaxial cable coming out of the CB is near a power line or other equipment, it can cause a problem.

With the proper equipment you could define the RF output and spectrum of the CB at different points within the environment under question. The simple solution is "keep the CB away - far away"! :)

Tom


>We have a location that has been having bizzare database problems. We fix it and it's damaged again very soon. Then someone noticed that a CB radio was sitting on top of the PC. They moved it and so far there has not been any more problems.
>
>Has anyone else heard of such a thing? I would have thought a PC would have any shielding it needs to stop that from happening. I hope this is the reason so that the problems are no more, but I'm surprised it make a difference.
>
>If this is somehting that cna happen, is there a good way to test for these types of problems.