MIL-STD-188-243A
frequency shall be separated by not less than 700 Hz. Both the higher frequency and the lower frequency shall be within the range of 1600 Hz to 300 Hz. The sweep pattern shall be repeated at a rate of between two to four sweeps per second.
5.4 Emergency Location Beacon-Aircraft (ELBA). ELBA single channel UHF radio equipment is used in search and rescue missions for downed aircraft. The requirements contained in this document for single channel ELBA radio equipment have been based on, and are compatible with, the standards set forth by the ICAO.
5.4.1 Frequency. Emergency location beacon-aircraft shall operate on the frequency of 243.0
MHz.
5.4.2 Frequency Tolerance. The frequency tolerance shall not exceed ±0.001 percent.
5.4.3 Emission Requirements. The antenna emission from a beacon under normal conditions and attitudes of the antenna shall be vertically polarized and omnidirectional in the horizontal plane.
5.4.4 Minimum Radiated Power. The radio's prime power source shall have the capability such that, over a period of 48 hours of continuous operation, at an operating temperature of -20 degrees Celsius, the mean radiated power shall at no time be less than 7.5 mW.
5.4.5 Emission Type. The type of emission shall be A2, Any other type of modulation that meets the requirements of paragraphs 5.4.6, 5.4.7, and 5.4.8 may be used, provided that it will not prejudice the precise location of the beacon by homing equipment.
5.4.6 Emission Interruption. The duration of interruption of the emission, if any, shall be such that it will not prejudice the detection and precise location' of the survival radio by the homing equipment.
5.4.7 Modulation. The carrier shall be amplitude modulated by a factor of at least 85 percent.
5.4.8 Audio Characteristics. The emission shall have a distinctive audio characteristic achieved by modulating the carrier with a varying audio frequency. The audio frequency shall sweep downward from a higher frequency to a lower frequency. The higher frequency and the lower frequency shall be separated by not less than 700 Hz. Both the higher frequency and the lower frequency shall be within the range of 1600 Hz to 300 Hz. The sweep pattern shall be repeated at a rate of between two to four sweeps per second.
6.1 Changes from previous issue. The margins of this specification are marked with vertical lines to indicate where changes from the previous issue were made. This was done as a convenience only and the Government assumes no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the requirements of this document based on the entire content irrespective of the marginal notations and relationship to the previous issue.
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