Electronic – If mobile phones have to go through such extensive FCC/CE/EMI testing, why do they interfere with the radio


It seems that to sell a GSM mobile phone, companies like Apple, Motorola, Sony Ericsson and many others invest a considerable amount of money in EMI testing them. Yet they still interfere with my stereo, radio, computer speakers, and other devices. Why?

Best Answer

The interference caused by GSM phones is an intentional radiator that is within the required limits of regulations.

I tend to blame the other devices for not shielding well enough. Any wireless device is going to have harmonics, its just a way of life and it just so happens that one of the harmonics with many GSM devices is in an audible range.