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2. For reception is difficult to place
Radio noise is the location and that tends to occur such as the following, in the hard-to-reach environmental conditions of
the radio waves, you may not be able to receive radio waves.
◆ Extremely hot or cold places
◆? High-voltage lines (wire), the train of the overhead line,
Airport (communication facility) near the ◆ car, a train, an airplane
◆? TV, refrigerator, personal computers,
appliances and near OA equipment such as
facsimile
◆? Close to the mobile phone in communication ◆ in the reinforced concrete building
? Valley, such as high-rise buildings and mountains, underground