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1、BRITISH STANDARD BS 6160-2: 1981 IEC 489-2: 1978 Methods of Measurement for radio equipment used in the mobile services Part 2: Transmitters employing A3 or F3 emissions UDC 621.396.9 182.3:621.317:621.396.61 * A3, F3 Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 08:06:45 GMT+00:00 2006, Un
2、controlled Copy, (c) BSI BS 6160-2:1981 This British Standard, having been prepared under the direction of the Electronic Equipment Standards Committee, was published under the authority of the Executive Board and comes into effect on 30 October 1981 BSI 04-2000 The following BSI references relate t
3、o the work on this standard: Committee reference EEL/25 Draft for comment 80/28652 DC ISBN 0 580 12313 8 Cooperating organizations The Electronic Equipment Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following: British Electrica
4、l and Allied Manufacturers Association (BEAMA) British Radio Equipment Manufacturers Association* Cable and Wireless Limited Cable Television Association of Great Britain Department of Industry (National Physical Laboratory) Electrical, Electronic, Telecommunications and Plumbing Union Electricity S
5、upply Industry in England and Wales Electronic Components Industry Federation Electronic Engineering Association* Institution of Electronic and Radio Engineers* Oil Companies Materials Association Post Office* Post Office Engineering Union Scientific Instrument Manufacturers Association The organiza
6、tions marked with an asterisk in the above list, together with the following, were directly represented on the Technical Committee entrusted with the preparation of this British Standard: British Broadcasting Corporation Home Office Independent Broadcasting Authority Ministry of Defence Radio, Elect
7、rical and Television Retailers Association Radio Society of Great Britain Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 08:06:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6160-2:1981 BSI 04-2000i Contents Page Cooperating
8、 organizationsInside front cover National forewordii Section 1. Supplementary definitions and conditions of measurement 1Scope1 2Object1 3Supplementary terms and definitions1 4Standard test conditions1 5Supplementary test conditions1 6Characteristics of the measuring equipment2 Section 2. Methods of
9、 measurement 7Frequency error2 8Terminal radio-frequency power3 9Radiated radio-frequency power7 10Input power and overall efficiency10 11Inter-transmitter intermodulation11 12Modulation characteristic11 13Audio-frequency harmonic distortion factor13 14Audio-frequency intermodulation distortion13 15
10、Modulation limiting13 16Residual modulation due to hum and noise13 17Transmitter attack time14 18Transmitter performance under conditions deviating from standard test conditions15 Appendix A Recommended characteristics of the measuring equipment16 Appendix B Guide for construction of a radiation tes
11、t site (30 m)16 Appendix C Example of a mains power line stabilization network (also known as artificial mains network)19 Figure 1 Input-signal measuring arrangement2 Figure 2 Measuring arrangement for terminal spurious narrow-bandwidth radio-frequency components4 Figure 3 Measuring arrangement for
12、terminal spurious transmitter noise6 Figure 4 Measuring arrangement for terminal adjacent-channel power7 Figure 5 Measuring arrangement for radiated spurious transmitter noise9 Figure 6 Measuring arrangement for radiated adjacent-channel power11 Figure 7 Measuring arrangement for modulation12 Figure
13、 8 Measuring arrangement for residual modulation14 Figure B.1 Measuring arrangement for transmitter at 30 m18 Figure C.1 Mains power line stabilization network (also known as artificial mains network)20 Figure C.2 Vector diagram of interference voltages20 Figure C.3 Example of a mains power line sta
14、bilization network21 Table I20 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 08:06:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6160-2:1981 ii BSI 04-2000 National foreword This British Standard has been prepared under the direction of the Elect
15、ronic Equipment Standards Committee. It is identical with IEC Publication 489-2:1978 “Methods of measurement for radio equipment used in the mobile services. Part 2: Transmitters employing A3 or F3 emissions”, published by the International Electrotechnical Commission (IEC). This Part should be read
16、, where applicable, in conjunction with Part 1 of this standard. NOTEThe emission designations A3 and F3 used in this British Standard are those which were given in Article 2 of the ITU1) Radio Regulations prior to the World Administrative Radio Conference held in 1979 (WARC 79). New designations fo
17、r emissions were agreed at WARC 79 and will be incorporated into this British Standard when the changes are made to the corresponding part of IEC Publication 489. Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard w
18、ithout deviation. Some terminology and certain conventions are not identical with those used in British Standards. There is no corresponding British Standard for IEC 244-6, referred to in 9.6.1. The Technical Committee has reviewed the provisions of IEC 244-6 and has decided that they are acceptable
19、 for use in conjunction with this standard. There are no corresponding British Standards for IEC 106, IEC 244-1, and C.I.S.P.R. Publications No. 2 and No. 4 but the references are for information only and therefore the validity of this standard is not affected. NOTETextual errors. In clause 1, line
20、2, “10 KHz” should be read as “10 kHz”. In 16.1.2, items b) and d), the unit, for signal level should be read as “dB (4V)”. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance
21、with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 22, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had
22、 amendments incorporated. This will be indicated in the amendment table on the inside front cover. 1) International Telecommunications Union. Cross-references International StandardCorresponding British Standard IEC 489-1:1979BS 6160 Methods of measurement for radio equipment used in the mobile serv
23、ices Part 1:1981 General definitions and standard conditions of measurement (Identical) Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 08:06:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6160-2:1981 BSI 04-20001 Section 1. Supplementary definitions and conditions of measurement 1 Scope Th
24、is standard refers specifically to mobile radio transmitters having audio-frequency bandwidths generally not exceeding 10 KHz for the transmission of voice and other types of signals, using: a) angle modulation (phase/frequency modulation), or b) double-sideband amplitude modulation with full carrie
25、r. The standard is intended to be used in conjunction with IEC Publication 489-1-1: General Definitions and Standard Conditions of Measurement. The supplementary terms and definitions and the conditions of measurement set forth in this standard are intended for type tests and may be used also for ac
26、ceptance tests. 2 Object The object of this standard is to standardize the definitions, the conditions and the methods of measurement used to ascertain the performance of transmitters within the scope of this standard and to make possible a meaningful comparison of the results of measurements made b
27、y different observers and on different equipment. 3 Supplementary terms and definitions For the purpose of this standard, the following supplementary definitions apply. 3.1 input simulation network (see Figure 1, page 2) a weighting network which modifies the characteristics of an audio-frequency ge
28、nerator so that it simulates the amplitude/frequency characteristics of a device which produces an electrical input signal as a result of a physical change 3.2 rated radio-frequency output power the power specified by the manufacturer which, under specified conditions of operation, should be availab
29、le at the transmitter output terminals when the latter are connected to a specified load 3.3 maximum usable amplitude deviation the value to which the peak amplitude deviation must be limited for technical or operational reasons 3.4 maximum permissible frequency (or phase) deviation the value to whi
30、ch the peak frequency (or phase) deviation must be limited by an agreed convention for a particular class of service 4 Standard test conditions Unless otherwise specified, all measurements shall be performed under the general test conditions as stated in IEC Publication 489-1 and the supplementary t
31、est conditions given below. 5 Supplementary test conditions 5.1 Input signal arrangements, modulation limiting and pre-emphasis for transmitters having accessible antenna terminals 5.1.1 Input-signal source The input-signal source shall consist of one of more audio-frequency generators connected to
32、the transmitter input terminals as shown in Figure 1. 5.1.2 Input-signal voltage The audio-frequency input-signal voltage is the voltage across terminals 1 and 2 of the arrangement shown in Figure 1. The input-signal voltage should be expressed in terms of the individual voltages of this signal. 5.1
33、.3 Standard test modulation Standard test modulation is the modulation due to a sinusoidal input signal of 1 000 Hz at a level to produce: 60 % of maximum usable amplitude deviation; 60 % of maximum permissible frequency (or phase) deviation. 5.1.4 Standard input-signal voltage The standard input-si
34、gnal voltage is the input voltage required to produce standard test modulation. 5.1.5 Modulation limiting The modulation limiter, if present, shall be adjusted for normal operation unless otherwise specified. 5.1.6 Pre-emphasis Pre-emphasis networks, if included in the transmitter, shall be operativ
35、e unless otherwise specified. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 08:06:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6160-2:1981 2 BSI 04-2000 5.2 Output-signal measuring arrangements for transmitters having accessible antenna terminals NOTEIn this standard, the term “antenna”
36、 is synonymous with “aerial”. 5.2.1 Test load A non-radiating load, with an impedance and power rating specified by the transmitter manufacturer, to replace the antenna including any associated transmission line when the transmitter is being tested. 5.2.2 Connections to the measuring equipment Care
37、must be taken to ensure that measuring equipment and any coupling devices do not adversely affect the transmitter loading conditions. 5.3 Output-signal measuring arrangements for transmitters without accessible antenna terminals The test load shall be the antenna supplied by the manufacturer. For ab
38、solute measurements, a test site equipped with radiation measurement instruments shall be used. For relative measurements, a radiation coupling system, for example a test fixture having stable characteristics over the range of measurement frequencies, shall be used. In this case, the output terminal
39、s of the test fixture shall be treated as the output terminals of the transmitter. 5.4 Limitations of the measuring audio-frequency band Because some properties, for example noise and audio-frequency harmonic distortion, depend upon the audio-frequency bandwidth of the test equipment, reproducible r
40、esults can be obtained only when the band of audio-frequencies occupied by the demodulated signal is restricted to specified limits. This restriction may be accomplished by means of a band-limiting filter preceding any audio-frequency measuring device. The filter may be incorporated within the measu
41、ring equipment. When measuring residual hum and noise, only the low-pass portion of the filter should be specified. 6 Characteristics of the measuring equipment Recommended characteristics of the measuring equipment are given in Appendix A. Section 2. Methods of measurement 7 Frequency error 7.1 Def
42、inition Frequency error is the difference between the unmodulated carrier frequency and the assigned frequency. The frequency error is expressed in parts per 106 or in hertz. For the purpose of this measurement, the assigned frequency is any one of the nominal frequencies. NOTES may be a simulation
43、network (see Sub-clause 3.1), an impedance matching network, through connection, or any other specified network. Figure 1 Input-signal measuring arrangement Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 08:06:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6160-2:1981 BSI 04-20003 NOTEThis
44、 definition is in conformity with the general definition of frequency error given in Section 2 of IEC Publication 244-1, Methods of Measurement for Radio Transmitters, Part 1: General Conditions of Measurement, Frequency, Output Power and Power Consumption. Assigned frequency is defined in the Inter
45、national Telecommunication Union (ITU) Radio Regulations. 7.2 Method of measurement The frequency error is determined by measuring the carrier frequency in the absence of modulation. The carrier frequency may be measured with any suitable measuring device with an accuracy that is at least ten times
46、more precise than the frequency tolerance given in the equipment specification. If required, the measurements may be repeated on each channel for which the transmitter is equipped to operate. 8 Terminal radio-frequency power This clause is applicable to transmitters equipped with suitable antenna te
47、rminals. 8.1 General The terminal radio-frequency power output of a transmitter may contain: a carrier component (Sub-clause 8.2); modulation components determining transmission quality (Clauses 12, 13 and 14); other modulation components, for example those contributing to the adjacent channel power
48、 (Sub-clause 8.5); spurious narrow bandwidth components (Sub-clause 8.3); noise, both inside the band (Clause 16) and outside, where it is called spurious transmitter noise (Sub-clause 8.4), and inter-transmitter intermodulation products (Clause 11). Measurements are normally made at the antenna ter
49、minals. Additional measurements may be made at the audio, control and power terminals, using specified terminations. 8.2 Carrier power 8.2.1 Definition The carrier power is the average power supplied to a transmission line by a transmitter during one radio-frequency cycle in the absence of modulation. NOTEThis definition is in conformity with that given in the ITU Radio Regulations. In this standard, the transmission line may be replaced by a test load. 8.2.2 Method of measurement Measure the output power in the absence of mo