Methods of measurement on receivers for television broadcast transmissions - Part 1: General considerations - Measurements at radio and video frequencies

Deals with the standard conditions and methods of measurement on television receivers that conform to the terrestrial broadcast television standards specified by the ITU-R. Such receivers may be used for direct off-air reception, reception via cabled networks or as a monitor for prerecorded video, home movies and games among other applications. Deals with the determination of performance and permits the comparison of equipment by listing the characteristics which are useful for specifications and by laying down uniform methods of measurement for these characteristics. performance requirements are not specified.

Meßverfahren für Empfänger von Fernseh-Rundfunksendungen - Teil 1: Allgemeine Vorschriften, Messungen bei Radio- und Videofrequenzen

Méthodes de mesures applicables aux récepteurs de télévision - Partie 1: Considérations générales - Mesures aux domaines radiofréquences et vidéofréquences

Se rapporte aux conditions et méthodes de mesures applicables aux récepteurs de télévision prévus pour la réception hertzienne terrestre. Ces derniers doivent être conformes aux systèmes de télévision spécifiés par l'UIT-R. De tels récepteurs peuvent être utilisés pour la réception hertzienne directe, pour la réception au travers des réseaux câblés, ou 'etre configurés en moniteur pour la visualisation par exemple de signaux vidéo enregistrés ou issus de consoles de jeux. Permet la détermination du niveau de performances d'équipements, ainsi que leur comparaison, en dressant la liste des caractéristiques représentatives, et en proposant des méthodes uniformes de mesures. Les performances exigées ne sont pas spécifiées.

Methods of measurement on receivers for television broadcast transmissions -- Part 1: General considerations – Measurements at radio and video frequencies (IEC 60107-1:1997)

General Information

Status
Published
Publication Date
04-May-1997
Current Stage
6060 - Document made available
Due Date
05-May-1997
Completion Date
05-May-1997

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SLOVENSKI STANDARD
SIST EN 60107-1:1999
01-april-1999
Methods of measurement on receivers for television broadcast transmissions --
Part 1: General considerations – Measurements at radio and video frequencies
(IEC 60107-1:1997)

Methods of measurement on receivers for television broadcast transmissions -- Part 1:

General considerations - Measurements at radio and video frequencies
Meßverfahren für Empfänger von Fernseh-Rundfunksendungen -- Teil 1: Allgemeine
Vorschriften, Messungen bei Radio- und Videofrequenzen
Méthodes de mesures applicables aux récepteurs de télévision -- Partie 1:

Considérations générales - Mesures aux domaines radiofréquences et vidéofréquences

Ta slovenski standard je istoveten z: EN 60107-1:1997
ICS:
33.160.25 Televizijski sprejemniki Television receivers
SIST EN 60107-1:1999 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 60107-1:1999
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SIST EN 60107-1:1999
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SIST EN 60107-1:1999
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SIST EN 60107-1:1999
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SIST EN 60107-1:1999
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SIST EN 60107-1:1999
NORME
CEI
INTERNATIONALE
IEC
60107-1
INTERNATIONAL
Troisième édition
STANDARD
Third edition
1997-04
Méthodes de mesures applicables
aux récepteurs de télévision –
Partie 1:
Considérations générales –
Mesures aux domaines radiofréquences
et vidéofréquences
Methods of measurement on receivers
for television broadcast transmissions –
Part 1:
General considerations –
Measurements at radio and video
frequencies
 IEC 1997 Droits de reproduction réservés  Copyright - all rights reserved

Aucune partie de cette publication ne peut être reproduite ni utilisée No part of this publication may be reproduced or utilized in

sous quelque forme que ce soit et par aucun procédé, électronique any form or by any means, electronic or mechanical, including

ou mécanique, y compris la photocopie et les microfilms, sans photocopying and microfilm, without permission in writing from

l'accord écrit de l'éditeur. the publisher
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: +41 22 919 0300 IEC web site http: //www.iec.ch
e-mail: inmail@iec.ch
CODE PRIX
Commission Electrotechnique Internationale
PRICE CODE XJ
International Electrotechnical Commission
Pour prix, voir catalogue en vigueur
For price, see current catalogue
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SIST EN 60107-1:1999
60107-1  IEC:1997 – 3 –
CONTENTS
Page

FOREWORD ................................................................................................................... 13

Clause

1 General .................................................................................................................... 15

1.1 Scope ............................................................................................................. 15

1.2 Normative references ..................................................................................... 15

2 General explanation of terms .................................................................................... 19

2.1 Definitions ...................................................................................................... 19

2.2 Types of receivers ........................................................................................... 19

2.3 Peripheral connectors ..................................................................................... 21

3 General notes on measurement ................................................................................ 21

3.1 General conditions........................................................................................... 21

3.1.1 Operation conditions ......................................................................... 21

3.1.2 Test room ......................................................................................... 21

3.1.3 Presentation of results ...................................................................... 21

3.1.4 Environmental conditions .................................................................. 21

3.1.5 Precautions during measurement ...................................................... 23

3.1.6 Power supply .................................................................................... 23

3.1.7 Stabilization period ........................................................................... 25

3.2 Test signals..................................................................................................... 27

3.2.1 Video test signals .............................................................................. 27

3.2.2 Audio test signals .............................................................................. 41

3.2.3 Teletext test signals .......................................................................... 41

3.3 Radiofrequency (r.f.) television signal ............................................................. 89

3.3.1 Carrier levels .................................................................................... 89

3.3.2 Reference modulation ....................................................................... 89

3.3.3 Test channels .................................................................................... 91

3.4 Radiofrequency input signals ........................................................................... 95

3.4.1 Radiofrequency input signal level ...................................................... 95

3.4.2 Radiofrequency input arrangements .................................................. 95

3.4.3 Radiofrequency input to built-in antennas .......................................... 97

3.5 Measuring system and test instruments .......................................................... 103

3.5.1 Measuring system ............................................................................. 103

3.5.2 Baseband test signal generators ....................................................... 103

3.5.3 Television test modulator .................................................................. 103

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60107-1  IEC:1997 – 5 –
Clause Page

3.5.4 RF signal generator .......................................................................... 105

3.5.5 Spectrum analyzer ............................................................................ 105

3.5.6 Video noise meter ............................................................................. 105

3.5.7 Oscilloscope ..................................................................................... 105

3.5.8 Vectorscope ...................................................................................... 105

3.5.9 Audio level/distortion meter ............................................................... 105

3.5.10 Passive devices ................................................................................ 107

3.5.11 Luminance meter and colorimeter ..................................................... 107

3.5.12 Other optical measuring instruments ................................................. 107

3.6 Standard measuring conditions ....................................................................... 111

3.6.1 Standard input signal levels .............................................................. 111

3.6.2 Standard output signal levels ............................................................ 111

3.6.3 Standard receiver settings ................................................................. 115

3.6.4 Standard viewing conditions .............................................................. 117

3.6.5 General conditions ............................................................................ 119

4 Initial tests under general operating conditions.......................................................... 121

4.1 Electrical and mechanical performance ........................................................... 121

4.2 Power consumption ........................................................................................ 123

5 Characteristics of radiofrequency channel................................................................. 125

5.1 Tuning characteristics ..................................................................................... 125

5.1.1 Operating frequency and its stability .................................................. 125

5.1.2 Fine tuning frequency range .............................................................. 127

5.1.3 Automatic frequency control (AFC) .................................................... 127

5.1.4 Tuning sensitivity .............................................................................. 131

5.1.5 Mechanical properties of tuning system ............................................. 131

5.1.6 Performance characteristics of presettable tuning systems ................ 133

5.1.7 Tuning steps ..................................................................................... 135

5.2 Sensitivity ....................................................................................................... 143

5.2.1 General measuring conditions ........................................................... 143

5.2.2 Gain-limited sensitivity ...................................................................... 143

5.2.3 Noise-limited sensitivity ..................................................................... 145

5.2.4 Synchronizing sensitivity ................................................................... 145

5.2.5 Colour sensitivity ............................................................................... 147

5.2.6 Coefficient of reflection at the antenna input ...................................... 147

5.2.7 Automatic gain control (AGC) static characteristics ........................... 151

5.2.8 Automatic gain control (AGC) dynamic characteristics ....................... 151

5.2.9 Colour killing ..................................................................................... 153

5.2.10 Maximum usable single r.f. input signal level ..................................... 155

5.2.11 Maximum usable multiple r.f. input signal level .................................. 155

5.3 Selectivity and response to undesired signals ................................................. 161

5.3.1 General ............................................................................................ 161

5.3.2 Two-signal selectivity ........................................................................ 163

5.3.3 Intermediate frequency interference ratio .......................................... 165

5.3.4 Adjacent channel interference ratio ................................................... 169

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SIST EN 60107-1:1999
60107-1  IEC:1997 – 7 –
Clause Page

5.3.5 Image interference ratio .................................................................... 171

5.3.6 Intermodulation interference ratio ...................................................... 175

5.3.7 Cross-modulation interference ratio ................................................... 179

5.3.8 IF beat interference ratio ................................................................... 183

5.3.9 Spurious frequency interference ratio ................................................ 183

5.3.10 Internally generated interference ....................................................... 185

6 Characteristics of luminance and chrominance channels ........................................... 193

6.1 Characteristics of the luminance channel ......................................................... 193

6.1.1 General measuring conditions ........................................................... 193

6.1.2 Amplitude response to video frequency ............................................. 193

6.1.3 Group delay characteristics to video frequency .................................. 195

6.1.4 Linear waveform response ................................................................ 197

6.1.5 Line-time non-linearity ....................................................................... 201

6.1.6 Chrominance to luminance intermodulation ....................................... 203

6.1.7 Black level and its stability ................................................................ 205

6.1.8 Cross luminance (SECAM system) .................................................... 207

6.2 Characteristics of chrominance channels ........................................................ 215

6.2.1 General measuring conditions ............................................................ 215

6.2.2 Chrominance automatic gain control characteristics ........................... 215

6.2.3 Differential gain and differential phase .............................................. 217

6.2.4 Amplitude response to modulation frequency ..................................... 219

6.2.5 Linear waveform response in chrominance channel ........................... 221

6.2.6 Luminance/chrominance delay inequality ........................................... 225

6.2.7 Line-time non-linearity of chrominance signals .................................. 229

6.2.8 Colour signal reproduction characteristics ......................................... 231

6.2.9 Stability of colour synchronization ..................................................... 233

6.2.10 Phase stability of subcarrier oscillator ............................................... 233

6.2.11 Cross-colour distortion ...................................................................... 237

6.2.12 Group delay characteristics at subcarrier frequency ........................... 241

6.2.13 Chrominance amplifier and limiter in SECAM receivers ...................... 245

6.3 Demodulation characteristics of chrominance signals inherent in each

colour system (NTSC, PAL and SECAM) ......................................................... 269

6.3.1 Errors of chrominance signal demodulation angle – NTSC system ..... 269
6.3.2 Errors of chrominance signal demodulation angle – PAL system ........ 273
6.3.3 Effects of phase distortion on incoming signal for small picture

areas – PAL system .......................................................................... 275

6.3.4 Direct and delayed signal amplitude matching – SECAM system ........ 277

6.3.5 Colour flaming on luminance transients – SECAM system ................. 279

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SIST EN 60107-1:1999
60107-1  IEC:1997 – 9 –
Clause Page
6.3.6 Influence of the reference frequency deviation of the FM

demodulator in SECAM colour decoders ........................................... 281

6.3.7 Deviation of the r.f. de-emphasis frequency adjustment in SECAM

colour decoders ................................................................................ 285

6.3.8 Colour crosstalk (SECAM system) ..................................................... 287

7 Characteristics of displayed pictures ......................................................................... 301

7.1 General properties of the picture ..................................................................... 301

7.1.1 General measuring conditions ........................................................... 301

7.1.2 Geometric distortion .......................................................................... 301

7.1.3 Over- and under-scanning and centring ............................................. 309

7.1.4 Luminance and contrast .................................................................... 313

7.1.5 Colour purity of colour CRT ............................................................... 317

7.1.6 White uniformity of colour CRT ......................................................... 317

7.1.7 Convergence and registration errors ................................................. 319

7.1.8 White balance ................................................................................... 321

7.1.9 Resolution ........................................................................................ 321

7.1.10 Interference due to asynchronicity of mains frequency with field

scanning frequency ........................................................................... 323

7.1.11 Sound to picture interference ............................................................ 325

7.1.12 Other characteristics of the picture .................................................... 327

7.2 Synchronizing quality ...................................................................................... 343

7.2.1 Synchronizing range ......................................................................... 343

7.2.2 Pulling on whites ............................................................................... 345

7.2.3 Pulling on field synchronization pulses .............................................. 345

7.2.4 Quality of interlace ............................................................................. 347

7.3 Picture size stability versus changes of CRT beam current .............................. 353

7.3.1 Picture breathing (static loading influences on picture geometry) ........ 353

7.3.2 Local picture distortion (dynamic loading influences on picture

geometry) ......................................................................................... 353

7.4 Characteristics inherent in projection type displays ......................................... 359

7.4.1 General ............................................................................................ 359

7.4.2 Luminance uniformity ........................................................................ 359

7.4.3 Uniformity of chromaticity .................................................................. 361

7.4.4 Viewing angle and dependence of luminance uniformity on the angle . 363

7.4.5 Dependence of chromaticity on viewing angle .................................... 365

7.4.6 Screen gain and luminous flux index of a projector ............................ 367

7.4.7 Blanking ........................................................................................... 371

7.5 Characteristics inherent in LCD displays ......................................................... 377

7.5.1 General ............................................................................................ 377

7.5.2 Luminance uniformity ........................................................................ 377

7.5.3 Variation of luminance with time ........................................................ 377

7.5.4 Uniformity of chromaticity .................................................................. 379

7.5.5 Viewing angle and dependence of luminance uniformity on the angle . 379

7.5.6 Dependence of chromaticity on viewing angle..................................... 379

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SIST EN 60107-1:1999
60107-1  IEC:1997 – 11 –
Clause Page

7.6 Characteristics inherent in widescreen displays................................................ 379

7.6.1 General ............................................................................................ 379

7.6.2 Display mode..................................................................................... 379

7.6.3 Methods of measurement .................................................................. 379

8 Characteristics inherent in the receivers using double-rate scan displays .................. 381

8.1 General .......................................................................................................... 381

9 Disturbance on the picture due to signals inserted into the field blanking interval....... 383

9.1 Introduction .................................................................................................... 383

9.2 Method of measurement ................................................................................. 383

9.3 Presentation of results .................................................................................... 385

10 Characteristics inherent in teletext signals ................................................................ 385

10.1 General .......................................................................................................... 385

10.2 General measuring conditions.......................................................................... 385

10.3 Characteristics of teletext signal ..................................................................... 385

Annexes

A Analytical description of the offset-carrier colour bar signal ...................................... 387

B Calculation of the relative amplitude and the group delay by the response

of a modulated sine-squared pulse .......................................................................... 391

C Bibliography .......................................................................................................... 393

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SIST EN 60107-1:1999
60107-1  IEC:1997 – 13 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_____________
METHODS OF MEASUREMENT ON RECEIVERS
FOR TELEVISION BROADCAST TRANSMISSIONS –
Part 1: General considerations –
Measurements at radio and video frequencies
FOREWORD

1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, the IEC publishes International Standards. Their preparation is

entrusted to technical committees; any IEC National Committee interested in the subject dealt with may

participate in this preparatory work. International, governmental and non-governmental organizations liaising

with the IEC also participate in this preparation. The IEC collaborates closely with the International Organization

for Standardization (ISO) in accordance with conditions determined by agreement between the two

organizations.

2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an

international consensus of opinion on the relevant subjects since each technical committee has representation

from all interested National Committees.

3) The documents produced have the form of recommendations for international use and are published in the form

of standards, technical reports or guides and they are accepted by the National Committees in that sense.

4) In order to promote international unification, IEC National Committees undertake to apply IEC International

Standards transparently to the maximum extent possible in their national and regional standards. Any

divergence between the IEC Standard and the corresponding national or regional standard shall be clearly

indicated in the latter.

5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any

equipment declared to be in conformity with one of its standards.

6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject

of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 60107-1 has been prepared by subcommittee 100A: Multimedia

end-user equipment, of IEC technical committee 100: Audio, video and multimedia systems

and equipment.

This third edition cancels and replaces the second edition published in 1977, amendment 1

(1987) and constitutes a technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
100A/5/FDIS 100A/40/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.
Annexes A and B form an integral part of this standard.
Annex C is for information only.
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SIST EN 60107-1:1999
60107-1  IEC:1997 – 15 –
-%4(/$3�/&�-%!352%-%.4�/.�2%#%)6%23
&/2�4%,%6)3)/.�"2/!$#!34�42!.3-)33)/.3�
0ART����’ENERAL�CONSIDERATIONS�
-EASUREMENTS�AT�RADIO�AND�VIDEO�FREQUENCIES
�� ’ENERAL
1.1 3COPE

This part of IEC 60107 deals with the standard conditions and methods of measurement on

television receivers that conform to the terrestrial broadcast television standards specified by

the ITU-R*. Such receivers may be used for direct off-air reception, reception via cabled

networks or as a monitor for prerecorded video, home movies and games among other

applications. This part does not include the measurements specific to the sound channels

which are dealt with by other parts: IEC 60107-2, 60107-3, 60107-4, and 60107-5.
Measurements for the non-broadcast signals are dealt with by IEC 60107-6.

This part of IEC 60107 deals with the determination of performance and permits the

comparison of equipment by listing the characteristics which are useful for specifications and

by laying down uniform methods of measurement for these characteristics. Performance

requirements are not specified.

This part of IEC 60107 does not deal with general safety matters, for which reference is

required to IEC 60065, or other appropriate IEC safety standards, nor with radiation and

immunity, for which reference is required to CISPR 13 and CISPR 20.
1.2 .ORMATIVE�REFERENCES

The following normative documents contain provisions which, through reference in this text,

constitute provisions of this part of IEC 60107. At the time of publication, the editions indicated

were valid. All normative documents are subject to revision and the parties to agreements

based on this part of IEC 60107 are encouraged to investigate the possibility of applying the

most recent editions of the normative documents indicated below. Members of ISO and IEC

maintain registers of currently valid International Standards.

IEC 60065: 1985, 3AFETY�REQUIREMENTS�FOR�MAINS�OPERATED�ELECTRONIC�AND�RELATED�APPARATUS�FOR

HOUSEHOLD�AND�SIMILAR�GENERAL�USE
Amendment 2 (1989) which incorporates amendment 1
Amendment 3 (1992)
IEC 60068-1: 1988, %NVIRONMENTAL�TESTING� �0ART����’ENERAL�AND�GUIDANCE

IEC 60107-2: 1997, -ETHODS� OF� MEASUREMENT� ON� RECEIVERS� FOR� TELEVISION� BROADCAST

TRANSMISSIONS� �0ART����!UDIO�CHANNELS� �’ENERAL�METHODS�AND�METHODS�FOR�MONOPHONIC

CHANNELS

IEC 60107-3: 1988, 2ECOMMENDED�METHODS�OF�MEASUREMENT�ON�RECEIVERS�FOR�TELEVISION

BROADCAST�TRANSMISSIONS� �0ART����%LECTRICAL�MEASUREMENTS�ON�MULTICHANNEL�SOUND�TELEVISION

RECEIVERS�USING�SUBCARRIER�SYSTEMS
_________
* Former CCIR.
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SIST EN 60107-1:1999
60107-1  IEC:1997 – 17 –

IEC 60107-4: 1988, 2ECOMMENDED�METHODS�OF�MEASUREMENTS�ON�RECEIVERS�FOR�TELEVISION

BROADCAST�TRANSMISSIONS� �0ART����%LECTRICAL�MEASUREMENTS�ON�MULTICHANNEL�SOUND�TELEVISION

RECEIVERS�USING�THE�TWO�CARRIER�&-�SYSTEM

IEC 60107-5: 1992, 2ECOMMENDED�METHODS�OF�MEASUREMENT�ON�RECEIVERS�FOR�TELEVISION

BROADCAST�TRANSMISSIONS� �0ART����%LECTRICAL�MEASUREMENTS�ON�MULTICHANNEL�SOUND�TELEVISION

RECEIVERS�USING�THE�.)#!-�TWO�CHANNEL�DIGITAL�SOUND�SYSTEM

IEC 60107-6: 1989, 2ECOMMENDED�METHODS�OF�MEASUREMENT�ON�RECEIVERS�FOR�TELEVISION

BROADCAST�TRANSMISSIONS� �0ART����-EASUREMENTS�UNDER�CONDITIONS�DIFFERENT�FROM�BROADCAST

SIGNAL�STANDARDS
IEC 60569: 1977, )NFORMATIVE�GUIDE�FOR�SUBJECTIVE�TESTS�ON�TELEVISION�RECEIVERS

IEC 60933-1: 1988, !UDIO��VIDEO�AND�AUDIOVISUAL�SYSTEMS� �)NTERCONNECTIONS�AND�MATCHING

VALUES� �0ART�������PIN�CONNECTOR�FOR�VIDEO�SYSTEMS� �!PPLICATION�.O���
Amendment 1 (1992)

IEC 60933-2: 1991, !UDIO��VIDEO�AND�AUDIOVISUAL�SYSTEMS� �)NTERCONNECTIONS�AND�MATCHING

VALUES� �0ART�������PIN�CONNECTOR�FOR�VIDEO�SYSTEMS� �!PPLICATION�.O���

IEC 60933-5: 1992, !UDIO��VIDEO�AND�AUDIOVISUAL�SYSTEMS� �)NTERCONNECTIONS�AND�MATCHING

VALUES� �0ART����9�#�CONNECTOR�FOR�VIDEO�SYSTEMS� �%LECTRICAL�MATCHING�VALUES�AND�DESCRIPTION

OF�THE�CONNECTOR

CISPR 13: 1990, ,IMITS�AND�METHODS�OF�MEASUREMENT�OF�RADIO�INTERFERENCE�CHARACTERISTICS�OF

SOUND�AND�TELEVISION�BROADCAST�RECEIVERS�AND�ASSOCIATED�EQUIPMENT
Amendment 3 (1995) which incorporates amendments 1 and 2

CISPR 20: 1996, ,IMITS�AND�METHODS�OF�MEASUREMENT�OF�IMMUNITY�CHARACTERISTICS�OF�SOUND�AND

TELEVISION�BROADCAST�RECEIVERS�AND�ASSOCIATED�EQUIPMENT
ITU-R BT.471-1: 1994, .OMENCLATURE�AND�DESCRIPTION�OF�COLOUR�BAR�SIGNALS

ITU-T J.63: 1990, )NSERTION�OF�TEST�SIGNALS�IN�THE�FIELD�BLANKING�INTERVAL�OF�MONOCHROME�AND

COLOUR�TELEVISION�SIGNALS
ITU-R BT.470-4: 1995, 4ELEVISION�SYSTEMS

ITU-R BT.814-1: 1994, 3PECIFICATIONS�AND�ALIGNMENT�PROCEDURES�FOR�SETTING�OF�BRIGHTNESS�AND

CONTRAST�OF�DISPLAYS
CIE 15.2: 1986, #OLORIMETRY

CIE 46: 1979, !�REVIEW�OF�PUBLICATIONS�ON�PROPERTIES�AND�REFLECTION�VALUES�OF�MATERIAL�REFLECTION

STANDARDS

C.W. Rhodes, 4HE�����4�MODULATED�SINE�SQUARED�PULSE�FOR�.43#��)%%%�4RANSACTIONS�ON

"ROADCASTING��VOL��"#�����.O�����-ARCH�����

C.A. Siocos, #HROMINANCE�TO�LUMINANCE�RATIO�AND�TIMING�MEASUREMENTS�IN�COLOR�TELEVISION�

)%%%�4RANSACTIONS�ON�BROADCASTING��6OL��"#�����.O�����-ARCH������
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SIST EN 60107-1:1999
60107-1  IEC:1997 – 19 –
�� ’ENERAL�EXPLANATION�OF�TERMS
2.1 $EFINITIONS

For the purpose of this part of IEC 60107-1, the following general definitions apply:

2.1.1 SIGNAL�STRENGTH�� The signal strength is considered to be equal to the r.m.s. value of

unmodulated radiofrequency signal having the same peak envelope amplitude as that of the

modulated television sign
...

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