SIST EN 60835-1-3:2002/A1:2002

SLOVENSKI STANDARD
SIST EN 60835-1-3:2002/A1:2002
01-oktober-2002
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 3: Transmission characteristics -
Amendment A1 (IEC 60835-1-3:1992/A1:1995)
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 3: Transmission characteristics
Meßverfahren für Geräte in digitalen Mikrowellen-Funkübertragungssystemen -- Teil 1:
Messungen an terrestrischen Richtfunksystemen und Satelliten-Erdfunkstellen --
Hauptabschnitt 3: Übertragungseigenschaften
Méthodes de mesure applicables au matériel utilisé pour les systèmes de transmission
numérique en hyperfréquence -- Partie 1: Mesures communes aux faisceaux hertziens
terrestres et aux stations terriennes de télécommunications par satellite -- Section 3:
Caractéristiques de transmission
Ta slovenski standard je istoveten z: EN 60835-1-3:1995/A1:1995
ICS:
33.060.30 Radiorelejni in fiksni satelitski Radio relay and fixed satellite
komunikacijski sistemi communications systems
SIST EN 60835-1-3:2002/A1:2002 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 60835-1-3:2002/A1:2002

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SIST EN 60835-1-3:2002/A1:2002

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SIST EN 60835-1-3:2002/A1:2002

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SIST EN 60835-1-3:2002/A1:2002
NORME CEI
INTERNATIONALE IEC
INTERNATIONAL
60835-1-3
STANDARD 1992
AMENDEMENT 1
AMENDMENT 1
1995-03
Amendement 1
Méthodes de mesure applicables au matériel
utilisé pour les systèmes de transmission
numérique en hyperfréquence -
Partie 1:
Mesures communes aux faisceaux hertziens
terrestres et aux stations terriennes de
télécommunications par satellite -
Section 3: Caractéristiques de transmission
Amendment 1
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 3: Transmission characteristics
© CEI 1995 Droits de reproduction
réservés — Copyright — all rights reserved
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SIST EN 60835-1-3:2002/A1:2002
835-1-3 Amend.l © IEC:1995 - 3 -
FOREWORD
This amendment has been prepared by sub-committee 12E: Radio relay and satellite
communication systems, of IEC technical committee 12: Radiocommunications.
The text of this amendment is based on the following documents:
DIS
Report on voting
12E(CO)167 12E/252/RVD
Full information on the voting for the approval of this amendment can be found in the
repo rt on voting indicated in the above table.
Page 3
CONTENTS
Add the following items:
6 Delay difference between two transmission paths 5
6.1 Definitions and general considerations 5
6.2 Method of measurement 5
6.3 Presentation of results 7
6.4 Details to be specified 9
Figures
8 Example of space diversity receiving system where delay difference
could be a problem 9
9 Arrangement for measuring delay difference between two branches of
a diversity system 11
10 Delay difference measurement: CRT display for a synchronized switch 11
11 Delay difference measurement: CRT display for a non-synchronized switch 11
12 Arrangement for measuring the switch-over characteristics as a function
of delay difference 13
13 Measurement of absolute delay of an i.f. component or sub-assembly 15

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SIST EN 60835-1-3:2002/A1:2002
835-1-3 Amend.1 © IEC:1995 - 5 -
Page 23
Add the following new clause:
6 Delay difference between two transmission paths
6.1 Definitions and general considerations
ant parameter with
The delay difference between two transmission paths is an impo rt
respect to the availability of radio links for the following reasons:
- the delay difference should be kept within certain limits in order to achieve slipless
switching between any main and a stand-by channel;
- the delay difference greatly influences the performance of functions such as
diversity switching and combining between any two channels.
NOTE - This clause refers only to i.f. delay-difference measurements. Baseband delay-difference
measurements are dealt with in IEC 835-2-5: 1993, Methods of measurement for equipment used in
digital microwave radio transmission systems - Part 2: Measurements on terrestrial radio-relay systems -
Section 5: Digital signal processing sub-system.
In terrestrial systems, means are provided to equalize delay differences either manually or
automatically. In order to assess the performance of these methods, the limiting delay
values which can be equalized by such techniques shall be measured using simulated
transmission paths during factory tests.
Figure 8 shows an example of a space diversity receiving system.
Another parameter to be measured is the absolute delay of receiver components during
rtance in
production or acceptance testing. For example, this measurement is of great impo
satellite earth station systems where "frequency-hopping" is used. In this case, the delay
difference between switched transmission paths should be adjusted to minimum.
Such absolute delay equalization can be carried out at the i.f. inte rfaces of the concerned
radio link receivers using commercially available test equipment.
6.2 Method of measureme
...