Senin, 22 September 2008

Very high frequency (VHF)


VHF merupakan radio frequensi yang mempunyai range 30 MHz to 300 MHz dimana frequensi ini di indikasikan sebagai High frequency ( Hf ) , dan level tertinggi selanjutnya adalah
di sebut Ultra HIgh Frequency ( UHF ).
dimana VHF biasa di gunakan untuk FM radio broadcast, television broadcast, land mobile stations (emergency, business, and military), Amateur Radio, marine communications, air traffic control communications and air navigation systems (VOR in particular).

dan secara pembagian nya adalah:
  • 30–46 MHz: Licensed 2-way land mobile communication.
  • 30–88 MHz: Military VHF-FM, including SINCGARS
  • 43–50 MHz: Cordless telephones, 49 MHz FM walkie-talkies and radio controlled toys, and mixed 2-way mobile communication. The FM broadcast band originally operated here (42-50 MHz) before moving to 88-108 MHz.
  • 50–54 MHz: Amateur radio 6 meter band; 50 MHz is an amateur radio band used for a variety of uses including DXing, FM repeaters and radio control
  • 55-72 and 77-88 MHz TV channels 2 through 6, known as "Band I" internationally; see North American broadcast television frequencies
  • 72–76 MHz: Radio controlled models, industrial remote control, and other devices. Model aircraft operate on 72 MHz while surface models operate on 75 MHz, air navigation beacons 74.8-75.2 MHz.
  • 88–108 MHz: FM radio broadcasting (88–92 non-commercial, 92–108 commercial in the United States) (Known as "Band II" internationally)
  • 108–118 MHz: Air navigation beacons VOR
  • 118–137 MHz: Airband for air traffic control, AM, 121.5 MHz is emergency frequency
  • 137-138 Space research,space operations, meteorological satellite
  • 138–144 MHz: Land mobile, auxiliary civil services, satellite, space research, and other miscellaneous services
  • 144–148 MHz: Amateur radio band 2 Meters
  • 148-150 Land mobile, fixed, satellite
  • 150–156 MHz: "VHF Business band," the unlicensed Multi-Use Radio Service (MURS), and other 2-way land mobile, FM
  • 156–158 MHz VHF Marine Radio; narrow band FM, 156.8 MHz (Channel 16) is the maritime emergency and contact frequency.
  • 160-161 MHz Railways
  • 162.40–162.55: NOAA Weather Stations, narrowband FM
  • 175-216 MHz television channels 7 - 13, known as "Band III" internationally. A minority of HDTV channels may appear here.
  • 174–216 MHz: professional wireless microphones (low power, certain exact frequencies only)
  • 216–222 MHz: land mobile,fixed, maritime mobile ,
  • 222–225 MHz: 1.25 meters (US) ( Canada 219-220, 222-225 MHz) Amateur radio
  • 225 MHz and above: Military aircraft radio (225–400 MHz) AM, including HAVE QUICK, dGPS RTCM-104
mungkin ini bisa sedikit memberikan pengetahuan kita tentang VHF ,hmmmm...kira-kira kita sering di kisaran berapa yah???


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