The two are exchanged using the button marked with a double-headed arrow. The display shows an active frequency of 123.5 MHz and a standby frequency of 121.5 MHz. For bands named Air, see Air (disambiguation) § Artists.Ī typical aircraft VHF radio. So if the ground frequency is 121.600, it may be shorted to ".6" ("point six").This article is about the radio spectrum used in aviation. So in reading back ground frequencies, the "121" may be assumed. Ground frequencies: previously ground frequencies were assigned frequencies beginning in 121.The following conventions have varying degrees of acceptance in the US. Sometimes for brevity, sometimes as another way to read back a frequency assignment to make sure it was received correctly, and occasionally out of laziness. In the VHF band, frequency designations read over the radio are often abbreviated. At hub airports, deice trucks often (not always) have dedicated frequencies these dedicated frequencies often do not have a corresponding FCC license because its mobile to mobile and coordinated by ASRI. These ramp frequencies are seldom published by the FAA.Īirline deice trucks at small and midsized stations often use the corresponding operations frequency. Most ramp frequencies are found in the 128.825-132.000 range. The ramp controllers provide permission for aircraft to enter and park at their gates, push back from the gate and start, and maintain the flow of traffic in their alleyways. SourceĪt large airports (DFW, DEN, DTW, ORD, LAX, among many others), the ramps are controlled by the airlines, not the FAA air traffic control. The licensee in FCC licenses is almost always ASRI, thus obfuscating the license's user. Coordinating and FCC licensing is handled by ASRI. Operations such as pilot to FBO, pilot to airline ground operation station, pilot to dispatch via a radio network such as San Francisco Radio, and deice trucks are found almost exclusively between 128.825-132.000. ARINC is now owned by Collins Aerospace and ASRI is owned by a consortium of U.S. ASRI was spun off from Aeronautical Radio, INC (ARINC) in 2010. The frequencies between 128.825-132.000 and 136.500-136.975 MHz are managed and coordinated by Aviation Spectrum Resources, Inc (ASRI). VHF en route frequencies changed effective :ġ29.4000 Northeast USA / Great Lakes Area / Canada West Coast and Anchorageġ29.9000 Maritime Net (Northeast Coast USA)ġ31.9500 Pacific Net (West Coast USA and Hawaii)Īircraft Communications Addressing and Reporting System ( ACARS)ĪCARS data is used to send messages to and from commercial airlines' aircraft.īalloon Operations 123.3000 Common air-to-ground (pilot-to-chase crew), shared with glider ops.ġ23.5000 Common air-to-ground (pilot-to-chase crew), shared with glider ops.
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