EN 60244-9:1994
(Main)Methods of measurement for radio transmitters - Part 9: Performance characteristics for television transposers
Methods of measurement for radio transmitters - Part 9: Performance characteristics for television transposers
Assesses the perfomance characteristics of television transposers. Enables the comparison of the results of measurements made by different observers.
Meßverfahren für Funksender - Teil 9: Übertragungseigenschaften von Fernsehumsetzern
Méthodes de mesure applicables aux émetteurs radioélectriques - Partie 9: Qualité de fonctionnement des réémetteurs de télévision
Décrit les méthodes de mesure pour évaluer la qualité de fonctionnement des réémetteurs de télévision. Permet de comparer les résultats de mesures réalisées par différents observateurs.
Methods of measurement for radio transmitters - Part 9: Performance characteristics for television transposers (IEC 60244-9:1993)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-januar-1999
Methods of measurement for radio transmitters - Part 9: Performance
characteristics for television transposers (IEC 60244-9:1993)
Methods of measurement for radio transmitters -- Part 9: Performance characteristics for
television transposers
Meßverfahren für Funksender -- Teil 9: Übertragungseigenschaften von
Fernsehumsetzern
Méthodes de mesure applicables aux émetteurs radioélectriques -- Partie 9: Qualité de
fonctionnement des réémetteurs de télévision
Ta slovenski standard je istoveten z: EN 60244-9:1994
ICS:
33.060.20 Sprejemna in oddajna Receiving and transmitting
oprema equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
NORME
CEI
INTERNATIONALE
IEC
244-9
INTERNATIONAL
Deuxième édition
STANDARD
Second edition
1993-03
Méthodes de mesure applicables aux émetteurs
radioélectriques
Partie 9:
Qualité de fonctionnement des réémetteurs
de télévision
Methods of measurement of radio transmitters
Part 9:
Performance characteristics for
television transposers
© CEI 1993 Droits de reproduction
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244-9 ©IEC: 1993 – 3 –
CONTENTS
Page
FOREWORD 5
INTRODUCTION 7
Clause
1 Scope 9
2 Normative references 9
3 General terms and definitions 11
4 General conditions of operation 13
5 General conditions of measurements 15
6 General transposer characteristics 19
7 Stability of the characteristic vision levels and output power 31
8 Linear distortion 33
9 Non-linear distortion 41
10 Wave-form distortion 45
11 Unwanted modulation 47
12 Unwanted emissions and changes in pe rf
ormance caused by feedback
from output to input 53
13 Impairments of the pe rf
ormance caused by coupling between
output and input 59
14 Special measurements for data signals in the vision signal 61
15 Method of measurement of the sound channel(s) 61
Annexes
A Input and output signal arrangements 67
B Input impedance 71
C Noise figure and signal-to-noise ratios 75
244-9 © I EC: 1993 - 5 -
INTERNATIONAL ELECTROTECHNICAL COMMISSION
METHODS OF MEASUREMENT
FOR RADIO TRANSMITTERS
Part 9: Performance characteristics
of television transposers
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 cooperation 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, prepared by technical committees on
which all the National Committees having a special interest therein are represented, express, as nearly as
possible, an international consensus of opinion on the subjects dealt with.
3)
They have the form of recommendations for international use 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.
International Standard IEC 244-9 has been prepared by sub-committee 12C: Transmitting
equipment, of IEC technical committee 12: Radiocommunications.
This second edition cancels and replaces the first edition published in 1982 and its amend-
ment 1 (1983) and constitutes a technical revision.
The text of this standard is based on the following documents:
DIS Repo rt on Voting
12C(CO)224 12C(CO)228
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 pa rt of this standard.
Annex C is for information only.
244-9 © IEC: 1993 — 7 —
INTRODUCTION
International Standard IEC 244-9 is one of a series of parts of IEC 244.
A number of existing parts of IEC 244 are currently under review and several of these will
be revised or withdrawn. When this process is complete, this series of publications
will comprise one part dealing with general characteristics, with cross-references to
relevant CCIR publications and the Radio Regulations, and a number of specialized parts,
each dealing with particular types of transmitters.
244-9 © IEC: 1993 — 9 —
METHODS OF MEASUREMENT
FOR RADIO TRANSMITTERS
Part 9: Performance characteristics
of television transposers
1 Scope
This part of IEC 244 contains the method of measurement to assess the performance
characteristics of television transposers. To assess all other characteristics, this standard
is to be used in conjunction with the publications quoted in clause 2.
This standard is intended to be used for type tests and acceptance or factory tests.
It is not mandatory to measure all the described characteristics. Additional measurements
may be carried out by agreement between customer and manufacturer.
The performance characteristics measured in accordance with this standard makes
possible the comparison of the results of measurements made by different observers.
Limiting values for acceptable performance are not covered by this standard but, in
connection with the presentation of measured characteristics, some data are given for
clarity.
2 Normative references
The following normative documents contain provisions which, through reference in this
text, constitute provisions of this part of IEC 244. At the time of publication, the editions
indicated were valid. All normative documents are subject to revision, and parties to agree-
ments based on this part of IEC 244 are encouraged to investigate the possibility of apply-
ing the most recent editions of the normative documents indicated below. Members of IEC
and ISO maintain registers of currently valid International Standards.
IEC 215: 1987,
Safety requirements for radio transmitting equipment
Amendment 1 (1990)
IEC 244-1: 1968,
Methods of measurement for radio transmitters — Part 1: General
conditions of measurement frequency, output power and power consumption (revision
under consideration)
IEC 244-5: 1992,
Methods of measurement for radio transmitters — Part 5: Performance
characteristics of television transmitters
IEC 244-10: 1986,
Methods of measurement for radio transmitters — Part 10: Methods of
measurement for television transmitters and transposers employing insertion test signals
244-9 © IEC: 1993 - 11 -
IEC 244-12-1: 1989, Methods of measurement for radio transmitters - Part 12: Guideline
for drawing up descriptive leaflets for transmitters and transposers for sound and tele-
vision broadcasting - Characteristics to be specified
IEC 244-12-2: 1989, Methods of measurement for radio transmitters - Part 12: Guideline
for drawing up descriptive leaflets for transmitters and transposers for sound and tele-
vision broadcasting - Specification sheets
IEC 244-13: 1991, Methods of measurement for radiotransmitters - Part 13: Performance
characteristics for FM sound broadcasting
IEC 487-1: 1984, Methods of measurement for equipment used in terrestrial radio-relay
systems - Part 1: Measurements common to sub-systems and simulated radio-relay
systems
IEC 864-1: 1986, Standardization of interconnections between broadcasting transmitters
or transmitter systems and supervisory equipment - Part 1: Interface standards for
systems using dedicated interconnections
Amendment 1 (1987)
CCIR Recommendation 468-4: 1986, Measurement of audio frequency noise voltage level
in sound broadcasting
CCIR Recommendation 567-1: 1986, Transmission performance of television circuits de-
signed for use in international connections
CCIR Recommendation 653: 1986, Teletext systems
CCIR Repo rt 624-3: 1986, Characteristics of television systems
CCIR Report 795-2: 1986, Transmission of two or more sound programmes or information
channels in television.
3 General terms and definitions
3.1 Television transposer
The term "television transposer" is used in this standard to refer to the equipment in a tele-
vision relay station which is connected between the feeder terminations of the receiving
aerial and the transmitting aerial and in which a frequency transposition is performed
without demodulation and modulation.
In some television relay stations, equipment is used in which no frequency transposition
takes place. Such equipment is termed an "active deflector". Most of the measurements
described in this standard also apply to active deflectors.
3.2 Description of the television system and other relevant information
See annex A of IEC 244-5.
244-9 © IEC: 1993 - 13 -
3.3 Definition of performance characteristics
The definitions are given in the clause describing the method of measurements, and are in
line with those given in IEC 244-12.
3.4 Standard video test signals
The video test signals are identified by a letter symbol. They are described in annex B of
IEC 244-5.
3.5 Definitions relating to the transposer output signal
3.5.1 Rated output power
The rated output power is defined as the peak envelope power of the vision signal. The
term "rated output power" is used for various measurements in this standard.
3.5.2 Reference output level
The reference output level is the level corresponding to the specified rated output power.
3.6 Definitions relating to the transposer input signal
3.6.1 Input voltage
The voltage of the vision signal at the input of a transposer with negative (or positive)
modulation of the vision carrier is the r.m.s. voltage, expressed in millivolts (dB(mV)) or
microvolts (dB(mV)), of a sinusoidal signal with an amplitude corresponding to the peak
envelope level of the vision signal.
3.6.2 Reference input level
The reference input level (100 % or 0 dB) is the level corresponding to the peak envelope
above) which produces the rated output
value of a vision signal of given voltage (see 3.6.1
power after appropriate adjustment of the transposer gain controls.
3.6.3 Input voltage range
The input voltage range of a transposer is the range of input voltages within which the
transposer's performance specification applies.
4 General conditions of operation
The transposer shall be tested under the following conditions:
a) Any device for the suppression of unwanted signals, irrespective of whether or not it
is located inside the transposer, shall be considered as a part of the transposer for the
purpose of this standard.
244-9 © I EC: 1993 — 15 —
b)
Unless otherwise specified, the measurements shall be made under normal operat-
ing conditions and at rated output power. If required, they shall be repeated under
extreme environmental conditions, in accordance with the equipment specification.
The power supply voltage and environmental conditions shall be stated with the
measurement results.
c) Due to practical limitations on the position of receiving and transmitting aerials,
there will be some coupling between them.
Where such coupling is specified, all the transposer tests shall be carried out with the
coupling simulated by feeding part of the output signal to the input of the transposer by
means of directional couplers inserted in the input and output connections of the
transposer. For further details, see figures A.1 to A.3 of annex A.
5 General conditions of measurements
Because a television transposer is a piece of equipment with radio-frequency input and
output, most of the measurements are based on radio-frequency input and output signals
only. Some measurements shall be carried out on video and audio signals using a
DSB (double-sideband) modulator or test transmitter and a VSB (vestigial-sideband)
demodulator.
5.1 Measuring arrangements
For the purposes of measurement, the transposer can be considered in terms of input and
output characteristics, and of transmission performance.
Depending on the particular measurements, one of the three measuring arrangements
described below may be employed.
Details of the arrangements are given in annex A.
— Arrangement A (figure A.1 of annex A)
The arrangement is built up from three (four) radio-frequency generators, each con-
nected to a passive matching and combining network. The combined output is con-
nected to the transposer input via an adjustable attenuator.
With this arrangement, the tests do not rely upon the process of modulation and de-
modulation as
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