Automatic Direction Finder
or
Automatic Direction Finding System
a navagation system used by aircraft and sea-going ships. It consists of one or more ground stations that transmit a signal in the 225 to 500 kHz (.225 to .500 MHz) range. Because of the low-frequnecy of these signals, their range is very good and not limited by the line-of-sight range of the VOR system. The recevier in the airplane/boat uses a loop antenna to "home-in" on the station. There is also a long-wire receiving antenna installed on many aircraft. Most ADF receivers can also recieve the AM broadcast band (530 to 1710 kHz) so pilots can also home in on powerful broadcast stations.
ADF signals should not be used in thunderstorms because the high amount of electro-magnetic interferance that lightening causes.
Many pilots can't even use the ADF system, which is a shame, becuase of better systems such as VOR and the GPS systems.
or
Automatic Direction Finding System
a navagation system used by aircraft and sea-going ships. It consists of one or more ground stations that transmit a signal in the 225 to 500 kHz (.225 to .500 MHz) range. Because of the low-frequnecy of these signals, their range is very good and not limited by the line-of-sight range of the VOR system. The recevier in the airplane/boat uses a loop antenna to "home-in" on the station. There is also a long-wire receiving antenna installed on many aircraft. Most ADF receivers can also recieve the AM broadcast band (530 to 1710 kHz) so pilots can also home in on powerful broadcast stations.
ADF signals should not be used in thunderstorms because the high amount of electro-magnetic interferance that lightening causes.
Many pilots can't even use the ADF system, which is a shame, becuase of better systems such as VOR and the GPS systems.
by IrishRepublicanArmy October 21, 2003
USAF radio code for command post or any other station that somewhat has command over something. Not used in UHF communications band. It is mostly the VHF tactical communications band (30 to 50 MHz)
by IrishRepublicanArmy November 07, 2003
An English company formed in 1600 to develop trade with the new British colonies in India and southeastern Asia; in the 18th century it assumed administrative control of Bengal and held it until the British army took over in 1858 after the Indian Mutiny
I have no idea why I am putting this definition in here, after all, its an urbandictionary, and this is history.
by IRISHrepublicanARMY December 29, 2003
by IrishRepublicanArmy December 22, 2003
by IrishRepublicanArmy February 19, 2004
for more information about the NOVA area, look at theses definitions:
Fairfax County Public Schools
Virginia
NOVA
Chantilly High School
Fairfax High School
Fairfax County Public Schools
Virginia
NOVA
Chantilly High School
Fairfax High School
by IrishRepublicanArmy January 05, 2004