1、STD-CEPT T/R 24-02 E-ENGL I1988 232b414 0034654 298 W T/R 2442 E Page 1 Disbibution: B Recommendation T/R 24-02 (Cannes 1983) DEVICES FOR DETECTING AVALANCHE VICTIMS BY MEANS OF LOW-POWER RADIO EQUIPMENT Recommendation proposed by the ”Radiocommunications” Working Group TIWG 3 (R) Text of the Recomm
2、endation adopted by the “Telecommunications ” Commission: The European Conference of Postal and Telecommunications Administrations, considering (a) that the rapidly expanding interest in mountaineering leads to a growing need for means of detecting people in danger, in particular avalanche victims,
3、(b) that various types of radio equipment for detecting avalanche Victims have been developed, operating on different frequencies, (c) that harmonking the main technical characteristics would increase the chances of success in rescue operations, (d) that it would therefore be desirable for the admin
4、istrations to apply common regulations in order to advance the harmonisation of equipment, recommends 1. that the CEPT members encourage the production of radio equipment for detecting avalaiiche victims in accordance with the technical cations set out in Annex I, 2. that the CEPT memks take the nec
5、essary measures with a view to promothg the use of radio equipment of an approved type in accordance with the specifications set out in Annex I, 3. that the CEFT members take the necessary measures to guarantee the freedom of 2. Alkaline batteries: 0.9 times the nominal voltage of the battery, 3. Ot
6、her types of batteries: In the case of equipment using other power sources or able to operate with several power soufces, the extreme test voltages shali be as indicated by the manufacturer with the agreement of the persons carrying out the tests. They will be specified in the measurement report. th
7、e voltage at the end of use as indicated by the manufacturer of the equipment. Edition of September 15, 1988 5.5. Performance of tests at extreme temperatures Before the meamements are made, the equipment must have reached its thermal equilibrium in the test chamber. The power supply to the equipmen
8、t will be cut until such time as thermal equilibrium has been reached. If the thermal equilibrium is not checked by measurement, a period of at least one hour or any other period determined by the persons carrying out the tests will be chosen as being the time necessary for this equilibrium to be re
9、ached. In order to avoid excessive condensation, a suitable order for the measurements and a suitable humidity setting in the test chamber shall be selected. Before starting tests at the extreme temperatures, the equipment shall be placed in the test chamber and shall remain there until such time as
10、 thermal equilibrium has been reached. An electric current shall then be passed through the equipment for four minutes in transmission conditions, after which time the equipment must meet the specifications. In addition, the equipment must be placed in a chamber in which the tempaahue has been reduc
11、ed to - 25“ C (2 3“ C) and kept at this temperature for a period of at least ten hours. The temperature must then be increased to - 15“ C (I 3“ C) and kept at this temperature for at least 2 hours. 5.6. Humidity cycle The equipment (device 1 and device 2) must be placed in a chamber at a temperature
12、 of 30“ C (+ 3“ C) with a degree of humidity of 95% (I 2%). The temperature shall then be reduced to 7“ C (I 3“ C) with a degree of humidity of 95% (I 2%) in such a way as to produce condensation. The chamber shall be kept in these conditions for 30 minutes. The temperature shall then be increased a
13、gain to 30“ C with a humidity of 95%. and the cycle shall recommence. This must be repeated three times in total. At the end of the test the chamber shall be kept at a temperature of 7“ C and at a degree of humidity of 95% for 30 minutes. Once this period has been completed, a performance check must
14、 be made. 6. MEASUREMENTS ON THE TRANSMITER AND THE RECEIVER 6.1. Frequency deviation of the transmitter 6.1.1. Definition The frequency deviation of the transmitter is the difference between the measured kequency of the carrier wave and its nominal value. 6.1.2. Method of measurements A coupler sha
15、ll be used between the transmitter and the frequency meter. The manufacturer may be asked by the persons carrying out the tests to supply means of eliminating any intermittent transmission system fiom the carrier for the convenience of the tests. The measurement shall be made under normal test condi
16、tions (paragraph 5.3.) then under extreme test conditions, whereby paragraphs 5.4.1. and 5.4.2. shall be applied simultaneously. Edition of September 15,1988 STD-CEPT TIR 24-02 E-ENGL 2988 232b4L4 00L4b58 933 E Tm24-ZE Page 6 6.1.3. 6.2. 6.2.1. 6.2.2. 6.2.3. 6.3. 6.3.1. 6.3.2. 6.3.3. Limits Transmis
17、sion on 2,275 Hz: The frequency deviation must not exceed f 20 Hz Transmission on 457 kHz: The frequency deviation must not exceed * 200 Hz. Field intensities produced by the transmitter Definition For the purposes of these specifications, the field intensity produced by the transmitter shall be the
18、 field intensity at a specific distance defined by the method of measurement. Method of measurement The transmitter shall be placed in any position at a distance of 3 m from a magnetic-field measuring selective receiver, calibrated to peak value. The field intensity shall be recorded for the positio
19、n of the receiver which produces the maximum field intensity. Limits In the case of 2,275 Hz: 4 dm. in the case of 457 kHz: 80 pNm. Spurious radiation from the equipment Definition For the purposes of these specifications, spurious radiation shall be trmsmisSions on any frequency other than those of
20、 the carrier and sideband components resulting from the normal modulation process. Method of measurement The equipment shall be placed in any position at a disiance of 3 m from a magnetic-field measuring selective receiver, calibrated to peak value, for frequencies up to 30 MHz. The field intensity
21、shall be recorded for the position of the equipment which produces the maximum field intensity. Limits 80 pA/m below 5 MHz; 40 pA/m between 5 and 10 MHZ; 10 pA/m above 10 h4H.z. i) Under certain mitions, it may be necessary to reduce the measuring distance to 1 m (resulting in limit values 21 times
22、higher), this mist then be mentioned in the test report. Edition of September 15, 1988 W 2326434 0014340 397 Adrn AUT BEL CZE T/R 23-02 Devices for detecting avalanche victims by means of low-power radio equipment Imp1 Remarks Yes No Not applicable Planned F FIN G GRC HNG I D I Yes DNK 1 No Yes No No Planned No Other equipment is authorised on other frequencies HRV I IRL Planned YeS No ISL LIE NOR POL POR ROU Yes Yes Yes Planned No Yes S SUI SVN TUR Yes Yes Yes Yes 2.9.1 997. Regulation on technical requirements for radio stations, art. 17 (Off.Gaz. of SVN, No. 50/97)
