The cat sensor does the work for you and keeps your cat safe. 1  With the Litter-Robot, maintenance is easy and infrequent. We recommend emptying the waste drawer once every 7-10 days for a single cat household, and more often if you have multiple cats.
It's simple. Radio waves travel unbelievably fastâat the speed of light (300,000 km or 186,000 miles per second). Analog radio. Ocean waves carry energy by making the water move up and down. In much the same way, radio waves carry energy as an invisible, up-and-down movement of electricity and magnetism.
am radio ranges from 535 to 1705khz kilohertz or thousands of cycles per second of electromagnetic energy these are the numbers you see on your am radio dial n ote in the tan area at the left of the illustration below that am radio waves are of a lower frequency than either fm radio or tv waves or the most part fm and tv signals are line of sight although this means that fm stations don t interfere with each other this characteristic creates a couple of other problems first these waves go in a straight line and don t bend around the earth as am ground waves do