IRISHREPUBLICANARMY's definitions

AFC

Automatic Frequency Control, a device used in FM recievers to prevent drift.

My DX-397 has an AFC.

by IrishrepublicanarmY January 1, 2004

ELT

Emergency Locator Transmitter. The ELT is a small radio transmitter that is installed in an aircraft and is designed to being transmitting upon impact (the crash) or it can be manually switched on. The ELT transmits a distincive signal on the international emergency frequencies of 121.5 MHz (VHF) and 243.0 MHz (UHF). This signal is picked up by ground stations, search and resuce aircraft (see Civil Air Patrol and Coast Guard, and satelites. Direction-finding equipment is then used to "home-in" on the signal and locate the downed aircraft.

Click on the recording above to listen to the sound of real ELT radio signal.

by IrishRepublicanArmy January 18, 2004

GPS

Global Positioning System

Complex network of satellites that transmit signals to ground receviers in cars, boats, airplanes (see also VOR). The GPS receiver uses the signals from the satellites (which are over 15,000 miles away!) and uses them to find your location, anywhere in the world, with incredable accuracy.

Without GPS, countless losers who can't use a VOR would be lost"

by IrishRepublicanArmy October 15, 2003

ADF

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.

"In most of the third world, the ADF navigation system is the only way to go"

by IrishRepublicanArmy October 21, 2003

703

The area code for Northern Virginia

for more information about the NOVA area, look at theses definitions:
Fairfax County Public Schools
Virginia
NOVA
Chantilly High School
Fairfax High School

by IrishRepublicanArmy January 5, 2004

South Lakes High School

South Lakes for short, its pretty ghetto, even Fairfax High School is better.

See South Lakes for definitions by people that really go there.

by IRISHREPUBLICANARMY January 7, 2004

white noise

(Repeater Term) is a scientific term used to describe a spectrum of broad band noise generated in a receiver's detector and sampled to control the receiver's squelch. This term is often incorrectly used in repeater work to describe the sounds heard when the received transmission is noisy and hard to understand, usually attributed to a weak signal and the repeater receiver limiters are not engaged.

Many people do not understand the correct usage of 'white noise'

by IrishRepublicanArmy January 1, 2004