SIST EN 60835-3-14:2002

SLOVENSKI STANDARD
01-oktober-2002
Methods of measurement for equipment used in digital microwave radio
transmission systems - Part 3: Measurements on satellite earth stations - Section
14: Earth stations for satellite news gathering (SNG) (IEC 60835-3-14:1996)
Methods of measurement for equipment used in digital microwave radio transmission
systems -- Part 3: Measurements on satellite earth stations -- Section 14: Earth stations
for satellite news gathering (SNG)
Meßverfahren für Geräte in digitalen Mikrowellen-Funkübertragungssystemen -- Teil 3:
Messungen an Satelliten-Erdfunkstellen -- Hauptabschnitt 14: Erdfunkstellen für
Reportagen über Satellit (SNG)
Méthodes de mesure applicables au matériel utilisé pour les systèmes de transmission
numérique en hyperfréquence -- Partie 3: Mesures applicables aux stations terriennes de
télécommunications par satellite -- Section 14: Stations terriennes pour le reportage
d'actualités par satellite (RAS)
Ta slovenski standard je istoveten z: EN 60835-3-14:1996
ICS:
33.060.30 Radiorelejni in fiksni satelitski Radio relay and fixed satellite
komunikacijski sistemi communications systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

NORME CEI
INTERNATIONALE IEC
INTERNATIONAL 60835-3-14
Première édition
STAN DARD
First edition
1996-03
Méthodes de mesure applicables au matériel
utilisé pour les systèmes de transmission
numérique en hyperfréquence
Partie 3:
Mesures applicables aux stations terriennes
de télécommunications par satellite
Section 14: Stations terriennes pour le
reportage d'actualités par satellite (RAS)
Methods of measurement for equipment used in
digital microwave radio transmission systems
Part 3:
Measurements on satellite earth stations
Section 14: Earth stations for satellite news
gathering (SNG)
© IEC 1996 Droits de reproduction réservés Copyright - all rights reserved
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835-3-14 © IEC:1996 – 3 –
CONTENTS
Page
FOREWORD 5
Clause
1 Scope 7
2 Normative references 7
3 Definition 9
4 General considerations 9
5 Methods of measurement 11
5.1 Antenna and ri parameters 11
5.2 Baseband parameters 15
5.3 Power supply system 17
6 Reference documents 17
835-3-14 © IEC:1996 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
METHODS OF MEASUREMENT FOR EQUIPMENT
USED IN DIGITAL MICROWAVE RADIO TRANSMISSION SYSTEMS -
Part 3: Measurements on satellite earth stations -
Section 14: Earth stations for satellite news gathering (SNG)
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, 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. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 835-3-14 has been prepared by sub-committee 12E: Radio
relay and satellite communication systems, of IEC technical committee 12: Radio-
communications.
The text of this standard is based on the following documents:
FDIS Report on voting
12E/259/FDIS
12E/266/RVD
Full information on the voting for the approval of this standard can be found in the repo
rt
on voting indicated in the above table.

835-3-14 ©
IEC:1996 - 7 -
METHODS OF MEASUREMENT FOR EQUIPMENT
USED IN DIGITAL MICROWAVE RADIO TRANSMISSION SYSTEMS —
Part 3: Measurements on satellite earth stations —
Section 14: Earth stations for satellite news gathering (SNG)
1 Scope
This section of IEC 835-3 deals with measurement methods applicable to satellite news
gathering (SNG) terminals.
2 Normative references
The following normative documents contain provisions which, through reference in
this text, constitute provisions of this section of IEC 835-3. At the time of publication,
the editions indicated were valid. All normative documents are subject to revision, and
parties to agreements based on this section of IEC 835-3 are encouraged to investigate
the possibility of applying the most recent editions of the normative documents indicated
below. Members of IEC and ISO maintain registers of currently valid International
Standards.
IEC 835-1-2: 1992, Methods of measurement for equipment used in digital microwave
radio transmission systems - Part 1: Measurements common to terrestrial radio-relay
systems and satellite earth stations - Section 2: Basic characteristics
IEC 835-3-7: 1995, Methods of measurement for equipment used in digital microwave
radio transmission systems - Part 3: Measurements on satellite earth stations - Section 7:
Figure-of-merit of receiving system
IEC/DIS 835-3-2: Methods of measurement for equipment used in digital microwave radio
transmission systems - Pa 3: Measurements on satellite earth stations - Section 2:
rt
1)
Antenna
IEC/DIS 835-3-13: Methods of measurement for equipment used in digital microwave radio
transmission systems - Part 3: Measurements on satellite earth stations - Section 13:
VSAT systems 1)
1) IEC/DIS 835-3-2 and IEC/DIS 835-3-13 are currently at the stage of final Draft International Standard
12/247/FDIS and 12E(CO)166 respectively.

835-3-14 ©
IEC:1996 – 9 –
3 Definition
For the purpose of this section of IEC 835-3, the following definition applies.
satellite news gathering (SNG): A highly po rt
able news-gathering satellite uplink system
of small size and weight operating in the fixed satellite se rvice (FSS), transported to the
site of a news event, with the purpose of uplinking a local video programme with its
associated sound programme. In addition to this main function, monitoring facilities are
normally provided to assess the main quality parameters of the uplinked picture and sound
signals. A two-way communication channel is available for voice communication between
the SNG terminal and the earth station receiving the uplinked signals.
4 General considerations
A typical example for a satellite network including an SNG terminal is shown in figure 1,
depicting the signal paths linking the satellite earth station, the SNG terminal, and
the receive-only earth stations feeding TV broadcast transmitters, cable TV (CATV)
networks, etc. Two kinds of SNG terminals may be used depending on the application
field. A flyaway SNG system is accommodated in several boxes suitable for delivery in an
aircraft while a vehicle SNG system includes, in addition to the items of a flyaway system,
more comprehensive communications, monitoring, and power supply facilities. An SNG
vehicle is used for the origination of TV broadcast material from locations which cannot be
served by terrestrial means, but which are conveniently accessible by the vehicle.
A typical block diagram of an SNG terminal using digital modulation is shown in figure 2.
According to this diagram, the video signal plus left and right components of the accompa-
nying stereo sound signal are fed to a video/sound encoder, and the composite digital
signal thus generated is used to modulate a quadrature phase shift keying (QPSK)
modulator. This modulated signal is up-converted to the UHF band by using a synthesized
oscillator, which is tuneable for selecting the appropriate satellite transponder channel.
The UHF band signal is again up-converted by a single-frequency oscillator and a broad-
band converter covering the relevant transponder band. In the example shown, this signal
is amplified by a high-power amplifier feeding, via a coupler and a switch, the transmit
bandpass filter. The low-level po rt of the coupler can be connected to an external counter
or spectrum analyzer for carrying out frequency or
...