Apple AirPort Time Capsule 802.11n (1st Generation) - Manual (Page 30)

30 Chapter 3 Tips and Troubleshooting
 If you place your Time Capsule in an entertainment center with your stereo
equipment, avoid surrounding your Time Capsule with audio, video, or power cables.
Place your Time Capsule so that the cables are to one side. Maintain as much space
as possible between your Time Capsule and the cables.
 Try to place your Time Capsule at least 25 feet (7.6 meters) from any microwave oven,
2.4 or 5 gigahertz (GHz) cordless phone, and other sources of interference.
 Do not place other objects (books, papers, small pets, etc.) on top of the Time
Capsule. It may interfere with Time Capsule cooling.
Items That Can Cause Interference with AirPort
The farther away the interference source, the less likely it is to cause a problem.
The following can interfere with AirPort communication:
 Microwave ovens
 Direct Satellite Service (DSS) radio frequency leakage
 The original coaxial cable that came with certain types of satellite dishes. Contact the
device manufacturer and obtain newer cables.
 Certain electrical devices such as power lines, electrical railroad tracks, and power
stations
 Cordless telephones that operate in the 2.4 or 5 GHz range. If you have problems
with your phone or AirPort communication, change the channel your base station or
Time Capsule uses, or change the channel your phone uses.
 Nearby base stations using adjacent channels. For example, if base station A is set to
channel 1, base station B should be set to channel 6 or 11.