According to the appendix in the Kindle user guide:
Kindle generates, uses, and can radiate radio frequency (RF) energy and, if not used in accordance with its instructions, may cause harmful interference to radio communications and electronic equipment. External RF signals may affect improperly installed or inadequately shielded electronic operating systems, entertainment systems and personal medical devices. While most modern electronic equipment is shielded from external RF signals, if in doubt, check with the manufacturer. For personal medical devices (such as pacemakers and hearing aids), consult with your physician or the manufacturer to determine if they are adequately shielded from external RF signals.
This device has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. However, there is no guarantee that interference will not occur in a particular installation.
This device meets the FCC Radio Frequency Emission Guidelines and is certified with the FCC as the FCC ID number found on the back of the device.
This will only happen with the international models as it is a function of the GSM radio. At & T, Cingular, T-Mobile cell phones do this as well.
How does this affect you? Well, if you have Whispernet on while listening to a radio you might hear a “Morse Code” type of noise. Like reading in bed? If you have a clock radio on the night stand you may hear the same noise even if the clock radio is off.
You might want to make sure that Whispernet is turned off if you take your Kindle to a stage theater or church. With current technology, most theaters use wireless microphones for amplification and even a closed circuit TV, so the crew can see what’s going on, on-stage. Any sort of cellular wireless service can interfere. Because of FCC rules, most of these wireless systems aren’t allowed to filter interference.
Yes, it is hard to live without your Amazon Kindle, and it has made a home in your purse briefcase, but just know that you may be causing interference. So in addition to exercising good manners, turning off your Kindle is a smart choice.
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