[读书学习] Electromagnetic spectrum 电磁谱

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2010-5-30 23:04

在美国

United States

A brief summary of some UHF frequency use:

    * 300–420 MHz: Government use, including meteorology, military aviation, and federal two-way use
    * 420–450 MHz: Government radiolocation and amateur radio (ham - 70 cm band)
    * 433 MHz: Short range consumer devices including automotive, alarm systems, home automation, temperature sensors
    * 450–470 MHz: UHF business band, General Mobile Radio Service, and Family Radio Service 2-way "walkie-talkies", public safety
    * 470–512 MHz: TV channels 14–20
    * 512–698 MHz: TV channels 21–51 (channel 37 used for radio astronomy)
    * 698–806 MHz: Was auctioned in March 2008; bidders got full use after the transition to digital TV was completed on June 12, 2009 (formerly TV channels 52–69)
    * 806–824 MHz: Public safety and commercial 2-way (formerly TV channels 70–72)
    * 824–851 MHz: Cellular A & B franchises, terminal (mobile phone) (formerly TV channels 73–77)
    * 851–869 MHz: Public safety and commercial 2-way (formerly TV channels 77–80)
    * 869–896 MHz: Cellular A & B franchises, base station (formerly TV channels 80–83)
    * 902–928 MHz: ISM band: cordless phones and stereo, radio-frequency identification, datalinks, amateur radio (33 cm band)
    * 929–930 MHz: Pagers
    * 931–932 MHz: Pagers
    * 935–941 MHz: Commercial 2-way radio
    * 941–960 MHz: Mixed studio-transmitter links, SCADA, other.
    * 960–1215 MHz: Aeronautical Radionavigation
    * 1240–1300 MHz: Amateur radio (ham - 23 cm band)
    * 1452–1492 MHz: Military use (therefore not available for Digital Audio Broadcasting, unlike Canada/Europe)
    * 1710–1755 MHz: AWS mobile phone uplink (UL) Operating Band
    * 1850–1910 MHz: PCS mobile phone—order is A, D, B, E, F, C blocks. A, B, C = 15 MHz; D, E, F = 5 MHz
    * 1920–1930 MHz: DECT Cordless telephone
    * 1930–1990 MHz: PCS base stations—order is A, D, B, E, F, C blocks. A, B, C = 15 MHz; D, E, F = 5 MHz
    * 2110–2155 MHz: AWS mobile phone downlink (DL) Operating Band
    * 2300–2310 MHz: Amateur radio (ham - 13 cm band, lower segment)
    * 2310–2360 MHz: Satellite radio (Sirius and XM)
    * 2390–2450 MHz: Amateur radio (ham - 13 cm band, upper segment)
    * 2400–2483.5 MHz: ISM, IEEE 802.11, 802.11b, 802.11g, 802.11n Wireless LAN, IEEE 802.15.4-2006, Bluetooth, ZigBee, Microwave oven