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5.3.1.1 Emergency locator transmitters shall operate on a frequency of 406.025 MHz plus or minus 2 kHz. The transmitted frequency shall not vary more than plus or minus 5 kHz in five years including the initial frequency offset. It shall not vary more than 2 parts in 10 to the ninth power in 100 milliseconds.
5.3.1.2 The period between transmissions shall be 50 seconds plus or minus 5 per cent.
5.3.1.3 Over a period of 24 hours of continuous operation at an operating temperature of –20 degrees Celsius, the transmitter power output shall be within the limits of 5 W plus or minus 2 dB.
5.3.1.4 The 406 MHz ELT shall be capable of transmitting a digital message.
[NBAA Note: The above technical specifications can be found in FAA Technical Standard Order (TSO) C-126, available at http://av-info.faa.gov/tso/Tsocur/C126.doc]
5.3.2 Transmitter identification coding
5.3.2.1 Emergency locator transmitters operating on 406 MHz shall be assigned a unique coding for identification of the transmitter of aircraft on which it is carried.
5.3.2.2 The emergency locator transmitter shall be coded in accordance with either the aviation user protocol or one of the serialized user protocols described in Appendix 1 to this chapter, and shall be registered with the appropriate authority.
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ICAO Annex 10 – Volume III, PART II
CHAPTER 5. EMERGENCY LOCATOR TRANSMITTER (ELT) FOR SEARCH AND RESCUE
5.1 GENERAL
5.1.1 Until 1 January 2005, emergency locator transmitters shall operate either on both 406 MHz and 121.5 MHz or on 121.5 MHz.
Note. – From 1 January 2000, ELT’s operating on 121.5 MHz will be required to meet the improved technical characteristics contained in 5.2.1.8.
5.1.2 All installations of emergency locator transmitters operating on 406 MHz shall meet the provisions of 5.3.
5.1.3 All installations of emergency locator transmitters operating on 121.5 MHz shall meet the provisions of 5.2.
5.1.4 From 1 January 2005, emergency locator transmitters shall operate on 406 MHz and 121.5 MHz simultaneously.
5.1.5 All emergency locator transmitters installed on or after 1 January 2002 shall operate simultaneously on 406 MHz and 121.5 MHz.
5.1.6 The technical characteristics for the 406 MHz component of an integrated ELT shall be in accordance with 5.3.
5.1.7 The technical characteristics for the 121.5 MHz component of an integrated ELT shall be in accordance with 5.2.
5.1.8 States shall make arrangements for a 406 MHz ELT register. Register information regarding ELT shall be immediately available to search and rescue authorities.
5.2 SPECIFICATION FOR THE 121.5 MHZ COMPONENT OF EMERGENCY LOCATOR TRANSMITTER (ELT) FOR SEARCH AND RESCUE
Note 1. – Information on technical characteristics and operational performance of 121.5 MHz ELTs is contained in RTCA Document DO-183 and European Organization for Civil Aviation Equipment (EUROCAE) Document ED.62.
Note 2. – Technical characteristics of emergency locator transmitters operating on 121.5 MHz are contained in ITU-R Recommendation M.690-1. The ITU designation for an ELT is Emergency Position – Indication Radio Beacon (EPIRB).
5.2.1 Technical characteristics
5.2.1.1 Emergency locator transmitters (ELT) shall operate on 121.5 MHz. The frequency tolerance shall not exceed plus or minus 0.005 per cent.
5.2.1.2 The emission from an ELT under normal conditions and attitudes of the antenna shall be vertically polarized and essentially omnidirectional in the horizontal plane.
5.2.1.3 Over a period of 48 hours of continuous operation, at an operating temperature of minus 20 degrees Celsius, the peak effective radiated power (PERP) shall at no time be less than 50 mW.
5.2.1.4 The type of emission shall be A3X. Any other type of modulation that meets the requirements of 5.2.1.5, 5.2.1.6, and 5.2.1.7 below may be used provided that it will not prejudice precise location of the beacon by homing equipment.
　
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