IEC 60244-3 : 1.0

METHODS OF MEASUREMENT FOR RADIO TRANSMITTERS - WANTED AND UNWANTED MODULATION

International Electrotechnical Committee

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FOREWORD
PREFACE
INTRODUCTION
Clause
1. Object
2. Scope
SECTION ONE - GENERAL TERMS RELATING TO WANTED MODULATION
3. General notes on modulation
4. Amplitude modulated emissions
5. Angle-modulated emissions
6. Pulse-modulated emissions
SECTION TWO - MEASUREMENTS RELATING TO WANTED MODULATION
7. Modulation factor of amplitude-modulated emissions
    with full carrier
8. Utilization factor of amplitude-modulated emissions
9. Frequency (or phase) deviation, frequency shift and
    centre-frequency variation of angle-modulated emissions
10. Utilization factor of angle-modulated emissions
11. Utilization factor or modulation factor of pulse-modulated
    emissions
SECTION THREE - CHARACTERISTICS OF TRANSMITTERS RELATING
                TO WANTED MODULATION
12. Input voltage for rated modulation, modulation input ratio
    and utilization factor/input voltage characteristic
13. Maximum long-term utilization (or modulation) factor and
    maximum short-term modulation input ratio
SECTION FOUR - VARIATION IN THE CARRIER CAUSED BY MODULATION
14. General notes on carrier-amplitude variation
15. Carrier-amplitude variation in transmitters for
    radiotelephony or sound broadcasting with full carrier
16. Carrier-amplitude variation in radiotelephony
    transmitters with reduced carrier
SECTION FIVE - UNWANTED MODULATION, INCLUDING HUM AND
               NOISE MODULATION
               (Under consideration)

Abstract

244-3A FIRST SUPPLEMENT 1971 244-3B SECOND SUPPLEMENT 1972 Describes the conditions and methods of measurement for assessing the performance of transmitters with respect to wanted and unwanted modulation. The methods of measurement described are restricted to those properties that may be liable to ambiguous interpretation due to the application of different methods and conditions of measurement and are intended for type tests and acceptance tests but may also be used for factory tests.