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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.
5.2.1.4 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.
Note.- Some ELTs are equipped with an optional voice
capability (A3E) in addition to the A3X emission.
5.2.1.5 The carrier shall be amplitude modulated at a
modulation factor of at least 0.85.
5.2.1.6 The modulation applied to the carrier shall have
a minimum duty cycle of 33 per cent.
5.2.1.7 The emission shall have a distinctive audio
characteristic achieved by amplitude modulating the carrier
with an audio frequency sweeping downward over a range of
not less than 700 Hz within the range 1 600 Hz to 300 Hz and
with a sweep repetition rate' of between 2 Hz and 4 Hz.
5.2.1.8 After 1 January 2000 the emission shall include
a clearly defined carrier frequency distinct from the
modulation sideband components; in particular, at least 30 per
cent of the power shall be contained at all times within plus or
minus 30 Hz of the carrier frequency on 121.5 MHz.
5.3 SPECIFICATION FOR UHF EMERGENCY
LOCATOR TRANSMITTER (ELT)
OPERATING ON 406 MHZ
5.3.1 Technical characteristics
Note 1.- Transmission ~haracteri~~tfiocrs emergency
locator transmitters operating on 406 MHz are contained in
CCIR Recommendation 633.
Note 2.- Information on technical chamcteristics and
operarional peflormanre of 405 MHz ELTs is contained in
RTCA Document 00-204 and European Organization for
Civil Aviation Electronics (EUROCAE) Document ED.62.
5.3.1.1 UHF 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
711 1/96
No. 71 350 ANNEX 10 - VOLUME I11
Part I1 Annex 10 - Aeronautical Telecommunicntions
5 kHz in five years including the initial frequency offset. It
shall not vary more than 2 parts in 10' 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°C, the transmitter
power output shalI 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.
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 or 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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No. 71
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APPENDIX 1 TO CHAPTER 5. EMERGENCY LOCATOR
TRANSMITTER CODING
(see Chapter 5, 5.3.2)
Note.- A detailed description of beacon coding is con- 2.2 The short message format described in CCW
tained in Document CCIR Recommendation 633. The following Recommendation 633 shall be used, making use of bits
information is specific to emergency locator transmitters used I through 11 2.
in aviation.
2.3 Protected field
1. GENERAL 2.3.1 The protected field consisting of bits 25 through
85 is protected by an error correcting code, and is the portion
1.1 ~h~ UHF emerg-e ncy- locator transmitter ~. ELT, , of the message which must be unique in every distress beacon.
operating on 406 MHz has the capacity to transmit a programmed
digital message which contains information related 2.3.2 A message format flag is indicated by bit 25 and
to the ELT andlor the aircraft on which it is carried. shall be value "0" to indicate the short message format.
1.2 The ELT shall be uniquely coded in accordance with
1.3 below and be registered with the appropriate authority.
Note.- The registration of an ELT will nomally be made
in a data base of the registering authority of the State on
whose register the aircraft equipped with the ELT is entered.
Any movement of the ELT through, for example, the sale of the
ELT or of'the aircraj? into which it is installed will nomally
be reported to the registering authorily.
1.3 The ELT digital message shall contain either the
transmitter serial number or one of the following information
　
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