1、CEPT T/R*ZO-OZE 2326414 0006303 3 (3 TfR20-02 Page E 1 Recommendation T/R 20-02 (The Hague 1972, revised at Mlaga-Torremolinos 1975), Stockholm 1976 and 1977, Ostend 1979, Cannes 1983, and Odense 1986) LOW-POWER RADIO TRANSMITTER-RECEIVERS INTENDED TO PROVIDE VOICE RADIOCOMMUNICATION IN THE 27 MHz B
2、AND (PR 27 RADIO EQUIPMENT) Recommendation proposed by the “Radiocommunications” Working Group T/WG 3 (R) Text of the revised Recommendation adopled by the “Telecommunications” Commission: “The European Conference of Postal and Telecommunications Administrations, considering (a) that, tanks to techn
3、ical progress, low-power transmitter-receivers, operated on collective frequencies, are avail- (b) that the use of such equipment can cause problems to Administrations, in the technical field as well as with respect (c) that it would be desirable for Administrations to have common regulations at the
4、ir disposal in order to simplify (d) that harmonization of the parameters for PR 27 equipment to the greatest extent possible is highly desirable, (e) that it would be advatageous to Administrations and the users and manufacturers of PR 27 radio equipment for (f) that the object should be the mutual
5、 recognition by CEPT members of such test reports, (g) that technical regulations with a common basis and the clear identification of PR 27 radio equipment would able to the public, to regulation, such problems, O test reports to be exchanged between Administrations in accordance with Recommendation
6、 T/R 7 1-02, facilitate frontier crossings for this type of equipment, recommends 1. that, to the extent that their national regulations permit, CEPT members allow such equipment to be used for any purpose and by any person, subject to the common technical and administrative conditions specified bel
7、ow, 2. that, to the extent that their national regulations permit, Administrations adopt rules for the authorization of PR 27 radio equipment in conformity with the conditions set out in Annex I of this Recommendation, 3. that the technical characteristics of PR 27 radio equipment be in conformity w
8、ith those mentioned in Annex II of this Recommendation, 4. that for type approval tests the methods of measurement described in Annex III of this Recommendation be used, 5. that test reports shall be in conformity with Recommendation T/R 71-02, 6. that in drawing up test reports Administrations foll
9、ow, as far as possible, the order of tests and numbering of clauses used in Annex III and adopt the terminology of Annexes II and III of this Recommendation.” O CEPT T/R*ZO-OZE 2326414 0006304 5 TIR 20-02 E Page 3 Table of contents Page Annex I . Conditions for the use of PR 27 radio equipment . 5 A
10、nnex II . Annex III . Technical specifications for PR 27 radio equipment Methods of measurement for PR 27 radio equipment 6 8 . 1 . SCOPE OF SPECIFICATIONS . 8 2 . TEST CONDITIONS, POWER SOURCES, AND AMBIENT TEMPERATURES 2.1. Normal and extreme test conditions 8 2.2. Test power source . 2.3. Normal
11、test conditions . 8 2.4. Extreme test conditions . 9 2.5. Procedure for tests at extreme temperatures 9 3 . GENERAL CONDITIONS . 9 Arrangement for test signals applied to the receiver input . 3.2. Receiver mute or squelch facility . 10 3.3. Receiver rated audio output power 10 3.4. Normal test modul
12、ation . 10 3.5. Artificial antenna . 10 3.6. Test fixture 3.7. 3.8. . 8 8 3.1. 10 10 10 12 4 . TRANSMITTER 13 Test site and general arrangements for measurements involving the use of radiated fields Arrangement for test signals at the input of the transmitter 4.1. Frequency error 13 4.2. Transmitter
13、 carrier power 13 4.3. Adjacent channel power . 14 4.4. Spurious emissions of the transmitter . 17 5 . RECEIVER 17 5.1. Maximum usable sensitivity . 17 5.2. Adjacent channel selectivity . 18 5.3. Spurious response rejection . 18 5.4. Intermodulation response 19 5.5. Spurious emissions of the receive
14、r . 19 6.1. Choice of model for type approval 20 6.2. Single-channel equipment 20 6.3. Multi-channel equipment 20 . 6 . PRESENTATION OF SINGLE- AND MULTI-CHANNEL EQUIPMENT FOR TYPE APPROVAL 20 7 . ACCURACY OF MEASUREMENTS . 20 Appendix A . Guidance on the use of radiation test sites 21 O Previous pa
15、ge is blank i Edition of September IS. 1988 ! 1 1. 2. 3. 4. 5. 6. 7. 8. 9. 1 o. 11. O CEPT T/R*20-02E W 232b414 000b305 i M TIR 20-02 E Page 5 Annex 1 CONDITIONS FOR THE USE OF PR 27 RADIO EQUIPMENT The use of PR 27 radio equipment either shall be granted by means of a general permission (general au
16、thorization), or shall be subject to the least possible restrictive conditions. A minimum age, determined by the Administrations in accordance with their national regulations, can be required for the operations of PR 27 radio equipment. If a licence is required, it shall be granted without regards t
17、o the applicants nationality. PR 27 radio equipment may be used either as base station, or as mobile station. PR 27 radio equipment shall not be used either on board aircrafts of any kind, or as aeronautical station. Transmission and reception shall take place on the same channel (single frequency,
18、simplex trafic). PR 27 radio equipment shall not be operated in conjunction with satellites. Connection of PR 27 radio equipment to the switched public telecommunications network shall be prohibited. PR 27 radio equipment shall be type approved. With the exception of directional antennae with gain i
19、n the horizontal plane, all types of external antennae may be allowed. Concerning the marking and the free circulation from one country to another of PR 27 radio equipment a reference is made to Recommendation T/R 20-02. 1 Previous page is blank Edition of September 15, 1988 I CEPT T/R*20-02E 232643
20、4 000630b 9 TIR 20-02 E Page 6 Annex II TECHNICAL SPECIFICATIONS FOR PR 27 RADIO EQUIPMENT 1. FREQUENCY BAND The frequency band for PR 27 equipment shall be 26.960 MHz-27.410 MHz. 2. CARRIER FREQUENCIES AND CHANNEL NUMBERS For PR 27 equipment the following carrier frequencies are available. Carrier
21、Chan. Carrier frequencies No. frequencies 26.965 MHz 1 27.105 MHz 26.975 MHz 2 27.115 MHz 26.985 MHz 3 27.125 MHz 27.005 MHz 4 27.135 MHz 27.015 MHz 5 27.155 MHz 27.025 MHz 6 27.165 MHz 27.035 MHz 7 27.175 MHz 27.055 MHz 8 27.185 MHz 27.065 MHz 9 27.205 MHz 27.075 MHz 10 27.215 MHz 27.085 MHz 11 27.
22、225 MHz Chan. No. 12 13 14 15 16 17 18 19 20 21 22 If an Administration wishes to grant authorization for the use of supplementary frequencies, a choice should be made from the frequencies mentioned in the list below. Carrier Chan. Carrier Chan. frequencies No. frequencies No. 27.235 MHz 24 27.325 M
23、Hz 32 27.245 MHz 25 27.335 MHz 33 27.255 MHz 23 27.345 MHz 34 27.265 MHz 26 27.355 MHz 35 27.275 MHz 27 27.365 MHz 36 27.285 MHz 28 27.375 MHz 37 27.295 MHz 29 27.385 MHz 38 27.305 MHz 30 27.395 MHz 39 27.315 MHz 31 27.405 MHz 40 3. CHANNEL SEPARATION The channel separation for PR 27 equipment shall
24、 be 10 kHz. 4. MULTI-CHANNEL EQUIPMENT Multi-channel equipment may be used, provided that such equipment is only designed for the authorized channels. Precautions should be taken against extension of the usable frequency range by the user. For instance the physical and electrical design of the chann
25、el switching system shall permit operation in not more than the authorized channels (22 or 40 channels). If for the determining of the transmitter frequency use is made of a synthesizer and/or of a PLL system, arbitrary input codes may only lead to the authorized channels. For the determination of t
26、he transmitter frequency only 1 crystal may be used. In the case of PLL systems or synthesizers this crystal is also the reference crystal. 5. TYPE OF MODULATION Only frequency or phase modulation shall be allowed (F3E/G3E). 6. FREQUENCY ERROR The frequency error of the transmitter shall not exceed
27、0.6 kHz. Edition of September 15, 1988 CEPT T/R*20-02E m 2326414 0006307 O = i O 7. 8. 9. 1 o. 11. 12. 13. 14. 15. O T/R 20-02 E Page 7 POWER Both the transmitter carrier power, and the effective radiated power of an equipment with an integral antenna, shall not exceed 4 watts. The equipment shall b
28、e constructed in such a way that an increase of output power cannot easily be achieved by actions, undertaken by the user of the equipment. ADJACENT CHANNEL POWER The adjacent channel power shall not exceed a value of 20 microwatt. SYNTHESIZERS AND PLL SYSTEMS If- for determining the transmitter fre
29、quency-use is made of a synthesizer and/or a phase locked loop system, the transmitter shall be inhibited when synchronisation is absent. SPURIOUS EMISSIONS OF THE TRANSMITTER (a) With the transmitter operating the power of spurious emissions shall not exceed 4 nanowatts in the following frequency b
30、ands: 41 MHz- 68 MHz 87.5 MHz-118 MHz 162 MHz-230 MHz 470 MHz-862 MHz The power of spurious emissions in other frequencies of the specified ranges (see Annex III) shall not exceed 0.25 microwatt on any arbitrary frequency below 1,000 MHz and 1 microwatt on any arbitrary frequency above 1,000 MHz. (b
31、) With the trunsmitter in stund-by the power of any spurious emission in the specified range of frequencies (see Annex III) shall not exceed 2 nanowatts for frequencies below 1,000 MHz and 20 nanowatts for frequencies above 1,000 MHz. MAXIMUM USABLE SENSITIVITY The maximum usable sensitivity shall n
32、ot exceed 6 dB (pV) relative to e.m.f. Equipment which is not equipped with a terminal that can be used for the connection of an external antenna is not submitted to this requirement. ADJACENT CHANNEL SELECTIVITY The adjacent channel selectivity shall not be less than 60 dB relative to an e.m.f. of
33、one microvolt. Equipment which is not equipped with a terminal that can be used for the connection of an external antenna is not submitted to this requirement. SPURIOUS RESPONSE REJECTION At any frequency separated from the nominal frequency of the receiver by more than one channel spacing, the spur
34、ious response rejection shall not be less than 60 dB relative to an e.m.f. of one microvolt. Equipment which is not equipped with a terminal that can be used for the connection of an external antenna is not submitted to this requirement. INTERMODULATION RESPONSE The intermodulation response rejectio
35、n shall not be less than 60 dB relative to an e.m.f. of one microvolt. Equipment which is not equipped with a terminal that can be used for the connection of an external antenna is not submitted to this requirement. SPURIOUS EMISSIONS OF THE RECEIVER The power of any spurious emission in the specifi
36、ed ranges of frequencies (see Annex III) shall not exceed 2 nanowatt on any discrete frequency below 1,000 MHz and 20 nanowatt above 1,000 MHz. Edition of September 15, 1988 CEPT T/R*20-02E 2326434 0006308 2 T/R 20-02 E Page 8 Annex III METHODS OF MEASUREMENT FOR PR 27 RADIO EQUIPMENT 1. 2. 2.1. 2.2
37、. 2.3. 2.3.1. 2.3.2. 2.3.2.1. 2.3.2.2. SCOPE OF SPECIFICATIONS This Annex describes the methods of measurement of the parameters, specified in Annex II of this Recommendation. It applies to equipment with a socket for an external antenna as well as to equipment with an integral antenna. In this spec
38、ification, an integral antenna is defined as one which is designed to be connected permanently to the transmitter/receiver without the use of a connector and/or the use of a feeder. In the case of equipment which is intended for use with a integral antenna as well as for equipment with an socket for
39、 an external antenna, the equipment shall be measured as equipment intended for use with an external antenna and shall meet the appropriate limits. In addition to this, the transmitter characteristics: - transmitter carrier power, - spurious emissions of the transmitter, and the receiver characteris
40、tic: spurious emissions of the receiver, shall be measured as for equipment for use with an integral antenna and the appropriate limits shall be met. TEST CONDITIONS, POWER SOURCES, AND AMBIENT TEMPERATURES Normal and extreme test conditions Type approval tests shall be made under normal test condit
41、ions, and also, where stated, under extreme test conditions. The test conditions and procedures shall be as specified in 2.2. to 2.5. Test power source During type approval tests the power source of the equipment shall be replaced by a test power source, capable of producing normal and extreme test
42、voltages as specified in 2.3.2. and 2.4.2. The internal impedance of the test power source shall be low enough for its effect on the test results to be negligible. For the purpose of tests, the voltage of the power source shall be measured at the input terminals of the equipment. If the equipment is
43、 provided with a permanently connected power cable, the test voltage shall be that measured at the point of connection of the power cable to the equipment. In equipment with incorporated batteries the test power source shall be applied as close to the battery terminals as practicable. During tests t
44、he power source voltages shall be maintained within a tolerance of f 3% relative to the voltage at the beginning of each test. Normal test conditions Normal temperature and humidity The normal temperature and humidity conditions for tests shall be any convenient combination of tempera- ture and humi
45、dity within the following ranges : Temperature + 15“ C to + 35“ C Relative humidity 20% to 75% Note. When it is impracticable to carry out the tests under the conditions stated above, a note to this effect, stating the actual temperature and relative humidity during the tests, shall be added to the
46、test report. Normal test power source Mains voltage and frequency The normal test voltage for equipment to be connected to the mains shall be the nominal mains voltage. For the purpose of these specifications, the nominal voltage shall be the declared voltage or any of the declared voltages for whic
47、h the equipment was designed. The frequency of the mains voltage shall be within the range 49 to 51 Hz. Regulated lead-acid battery power sources on vehicles When the radio equipment is intended for operation from the usual types of regulated lead-acid battery power sources on vehicles, the normal t
48、est voltage shall be 1.1 times the nominal voltage of the battery (6 volts, 12 volts, etc.). Edition of September 15, 1988 CEPT T/R*20-02E = 232bYL4 0006309 4 2.3.2.3. 2.4. 2.4.1. 2.4.2. 2.4.2.1. 2.4.2.2. 2.4.2.3. 2.5. 2.5.1. 3. 3.1. TIR 20-02 E Page 9 Other power sources For operation from other po
49、wer sources or types of battery (primary or secondary), the normal test voltage shall be that declared by the equipment manufacturer and accepted by the testing authorities. Extreme test conditions Extreme temperatures For tests at extreme temperatures, measurements shall be made in accordance with the procedures specified in Clause 2.5., at the upper and lower temperatures of -10C and +Soc Extreme test voltages Mains voltage and frequency The extreme test voltage for equipment to be connected to an AC mains source shall be the nominal mains voltage f 10%. The frequency of the mains volta
