电视接收频率范围.doc

电视接收频率范围我国电视和调频广播的频率范围是：48.5MHz960MHz，属于超短波与分米波频段，其部分波段是微波，应当引起严密关注。国家环保总局对北京中央广播电视塔、上海东方明珠塔和天津天塔电磁辐射验收的结果表明，塔高均在400米以上，发射总功率在2(点击:5958) 我国电视和调频广播的频率范围是：48.5MHz960MHz，属于超短波与分米波频段，其部分波段是微波，应当引起严密关注。国家环保总局对北京中央广播电视塔、上海东方明珠塔和天津天塔电磁辐射验收的结果表明，塔高均在400米以上，发射总功率在200kw以上的城市高大电视塔周围及高层电磁辐射环境功率密度为几个Wcm2，均小于该频段40Wcm2的国标标准。电视频道频段划分:VHF频段：L段，15频道，称波段；H段，612频道,称波段 ；UHF频段：1368频道。其中56频道与1213频道之间的频段为增补频段，分别为A波段与B波段波段频道频率范围图象载频伴音载频本机振荡I波段(米波)DS12348.656.556.564.564.572.549.7557.7565.7556.2564.2572.2586.7594.75102.75II波段(米波)457684849277.2585.2583.7591.75114.25122.25III波段(米波)6789 10 11 12167175175183183191191199199207207215215223168.25176.25184.25192.25200.25208.25216.25174.75182.75190.75198.75206.75214.75222.75205.25213.25221.25229.25237.25245.25253.25IV波段(分米波)DS 131415 1617181920 21 2223 24470478478486486494494502502510510518518526526534534542542550550558558566471.25479.25487.25495.25503.25511.25519.25527.25525.25543.25551.25559.25477.75485.75493.75501.75509.75517.75525.75533.75541.75549.75557.75565.75508.25516.25524.25532.25540.25548.25556.25564.25572.25580.25588.25596.25V波段(分米波)25 26272829303132333435 36 373839404142606614614622622631631638638646646654654662662670670678678686686694694702702710710718718726726734734742742750607.25615.25623.25631.25639.25647.25655.25663.25671.25679.25687.25695.25703.25711.25719.25727.25735.25743.25613.75621.75629.75637.75645.75653.75661.75669.75677.5685.75693.75701.75709.75717.75725.75733.75741.75749.75644.25652.25660.25668.25676.25684.25692.25700.25708.25716.25724.25732.25740.25748.25756.25764.25772.25780.25V波段(分米波)DS4344454647484950515253545556575859606162636465666768750758758766766774774782782790790798798806806814814822822830830838838846846854854862862870870878878886886894894902902910910918918926926934934942942950950958751.25759.25767.25775.25783.25791.25799.25807.25715.25823.25831.25839.25847.25855.25863.25871.25879.25887.25895.25903.25911.25919.25927.25935.25943.25951.25757.75765.75773.75781.75789.75797.75805.75813.75821.75829.75837.75845.75853.75861.75869.75877.75885.75893.75901.75909.75917.75925.75933.75941.75949.75957.75788.25796.25804.25812.25820.25828.25836.25844