1/17/2024 0 Comments Air traffic control listenBoth communication and VOR navigational systems are operated on VHF frequencies. Very High Frequency (VHF)įrequencies in the very high frequency band are most widely used for domestic aircraft communications at the present time. High frequency continues to be used for voice communications for international flights, however, as it can travel a longer distance than VHF. That traffic has since shifted to the very high frequency (VHF) band. In the past, high frequency bands were typically used for domestic voice communications. Most planes have radio direction finders onboard that get a bearing by focusing in on a medium frequency transmission. Medium Frequency (MF)Īviation radio is allocated a small portion of the medium frequency spectrum in a band from 2850 to 3000 KHz. Low frequency is useful even when other forms of communication fail because its long wavelengths are less affected by terrain and it can bounce off the ionosphere to travel long distances around the world. Others were kept operational as backups in case of primary navigation system failures. Today, some low frequency beacons remain and are used for instrument landings. As reliable higher frequency systems were developed, most of the low frequency air nav beacons were shut down. Historically, when aviation radio was first starting out, most air navigation transmissions took place on the low frequency band from 200 KHz to 415 KHz. These frequencies may be used for voice communications or for navigation. Types of Aviation Radio SignalsĪviation radio frequencies are found in the low frequency (LF), medium frequency (MF), high frequency (HF), and very high frequency (VHF) bands. Once the aircraft leaves the airspace of the airport, the pilot will be handed off to a controller at a TRACON (Terminal Radar Approach Control) or an ARTCC Center (Air Route Traffic Control Centers), commonly called Air Traffic Control).Īpproach Control ( TRACON) - Directs several lines of descending aircraft into one smooth flowing line of aircraft as their courses take them closer to the destination airport.ĭeparture Control ( TRACON) - Routes air traffic immediately upon takeoff via a preferential departure route (PDR) leading away from the departure airport as the aircraft ascends to the en route phase of flight. Tower - The Tower Controller is responsible for the aircraft in the immediate area around the airport (Up to 3000 feet and 5 miles from the airport). Ground Control - The ground controller tells the pilot which taxiways to use to arrive at the correct runway. Most airports large enough to have control towers have the following types of channels:ĪTIS ( Automatic Terminal Information Service)- Weather, equipment failures, closed runways and taxiways, current operating runways, special notes, and NOTAM's.Ĭlearance Delivery - The pilot uses this frequency to notify a controller of his flight intentions and to receive flight instructions and clearance for take-off. Airports with control towers usually have an assigned Unicom channel of 122.950. If you do live near an airport, you can find out all the traffic control, weather, and Traffic Advisory frequencies by entering the airport at AirNav.Īt most small airports that don't have control towers, the UNICOM frequency is used by the pilots use to talk to each other, usually 122.700, 122.800, 122.900, 123.000 or 123.050. See LiveATC.Airborne planes can easily be heard from well over 100 miles, so you don't have to live near an airport. Potomac Approach/Departure (WOOLY Sector)Īrchive Access: ZDC Washington Center (SWANN)Īrchive Access: ZDC Washington Center (SWANN) #2 KBWI IFR High Altitude Chart (iFlightPlanner)Īrchive Access: Potomac App (BELAY/BUFFR)Īrchive Access: Potomac App (GRACO/PALEO) KBWI VFR Sectional Chart (iFlightPlanner) KBWI IFR Low Altitude Chart (iFlightPlanner) KBWI ADS-B Flight Tracking (ADSBExchange) ICAO: KBWI IATA: BWI Airport: Baltimore/Washington International Thurgood Marshall AirportĬountry: United States Continent: North America KBWI METAR Weather: KBWI 292354Z 29006KT 10SM FEW045 FEW085 BKN250 28/22 A2978 RMK AO2 SLP083 CB DSNT SE-S MOV E 60011 T02780222 10356 20244 51020 $
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