a system which permits the selective calling of individual aircraft over radiotelephone channels linking a ground station with the aircraft
an automatic signaling system used in aircraft to notify the pilot that the aircraft is receiving a call
Это интересно
Each aircraft operated by an airline is assigned a particular four-tone combination for identification purposes. A ground station keys the signal when trying to contact a particular aircraft. The signal is decoded by the airborne selcal system and the crew is alerted. The system can operate on VHF (very high frequency) as well as HF (high frequency) frequencies. A total of 10,920 codes can be generated by the system.
Это интересно
Valdkond ICAO lisade põhjal loodud klassifikaatori järgi: Lennuliikluse korraldamine
With the selective calling system known as SELCAL, the voice calling is replaced by the transmission of coded tones to the aircraft over the radiotelephony channels. A single selective call consists of a combination of four pre-selected audio tones whose transmission requires approximately 2 seconds.
The purpose of the SELCAL system is to permit the selective calling of individual aircraft over radiotelephone channels linking the ground station with the aircraft, and is intended to operate on en-route frequencies with existing HF and VHF ground-to-air communications transmitters and receivers with a minimum of electrical and mechanical modification.
На странице корпусного менеджера SkELL пользователь может познакомиться с контекстами употребления и с распространёнными сочетаниями слова, а также с синонимами и другими близкими по значению словами. Данные выбраны компьютером aвтомaтически и могут содержать ошибки.
