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The following list shows specific aeronautical transponder codes (typically called squawk codes), and ranges of codes, that have been used for specific purposes in various countries. Traditionally, each country has allocated transponder codes by their own scheme with little commonality across borders.
The code is received by any aircraft receiver monitoring the radio frequency on which the SELCAL code is broadcast. A SELCAL decoder is connected to each aircraft's radio receiver. When a SELCAL decoder on an aircraft receives a signal containing its own assigned SELCAL code, it alerts the aircraft's crew by sounding a chime, activating a light ...
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Selcall (selective calling) is a type of squelch protocol used in radio communications systems, in which transmissions include a brief burst of sequential audio tones. . Receivers that are set to respond to the transmitted tone sequence will open their squelch, while others will remain
60 - Voltage or Current Balance Relay; 60N - Neutral Current Unbalance; 60P - Phase Current Unbalance; 61 - Density Switch or Sensor; 62 - Time-Delay Stopping or Opening Relay; 63 - Pressure Switch Detector; 64 - Ground Protective Relay; 64F - Field Ground Protection; 64R – Rotor Earth Fault; 64REF – Restricted Earth Fault Differential; 64S ...
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This is a list of all airline codes. The table lists the IATA airline designators , the ICAO airline designators and the airline call signs (telephony designator). Historical assignments are also included for completeness.
Otter Tail initially used the SEL-21 for its fault location and event recording functions. SEL uses OTTER and TAIL as default passwords for their relays as an homage to their very first customer. In 1985, SEL built its first building and employed eleven people. In 2009, SEL became 100% employee-owned under an employee stock ownership plan (ESOP).