irishrepublicanarmy's definitions
1) The identifying code letters or numbers of a radio or television transmitting station, assigned by a regulatory body. Also called call sign or call letters.
2) (military) code word for aircraft, ship, etc, used in radio communications.
2) (military) code word for aircraft, ship, etc, used in radio communications.
by IRISHREPUBLICANARMY December 26, 2003
Get the callsign mug.the PRC doesn't stand for anything.
the PRC-77 (and the improved PRC-770) are military VHF FM transcievers, that have been used sence 1960, and are slowly being phased out because the US Army likes them.
Frequency Coverage:
30.0000 to 76.0000 MHz
channel spacing:
50 kHz
channels:
920
Power Output:
5 watts
Range:
10 miles on a bad day
5 miles when the VC are shooting at you
30 miles when you get back to base
PRC-77s are used as manpack radios (straped to the back of GIs and used for unit-to-unit communications), if you've ever seen the movie "Platoon", the PRC-77 is the radio that all the Americans are carrying on thier backs.
or they are installed as radios in Humvees and tanks. (i.e. all the antennas on military viecles are connected to PRC-77s.
widly copied by every NATO member, so all the good guys can talk to each other.
the PRC-77 (and the improved PRC-770) are military VHF FM transcievers, that have been used sence 1960, and are slowly being phased out because the US Army likes them.
Frequency Coverage:
30.0000 to 76.0000 MHz
channel spacing:
50 kHz
channels:
920
Power Output:
5 watts
Range:
10 miles on a bad day
5 miles when the VC are shooting at you
30 miles when you get back to base
PRC-77s are used as manpack radios (straped to the back of GIs and used for unit-to-unit communications), if you've ever seen the movie "Platoon", the PRC-77 is the radio that all the Americans are carrying on thier backs.
or they are installed as radios in Humvees and tanks. (i.e. all the antennas on military viecles are connected to PRC-77s.
widly copied by every NATO member, so all the good guys can talk to each other.
by IrishRepublicanArmy October 21, 2003
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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
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