SIST ETS 300 638 E1:2003

Transmission and Multiplexing (TM); Digital Radio Relay Systems (DRRS); Fixed point-to-point radio link equipment for the transmission of digital signals and analogue video signal operating in the frequency bands 10 GHz and 14 GHz with 20 MHz alternate channel spacing

To specify parameters for digital and analogue radio relay systems in frequency bands with about 20 MHz channel spacing using an alternated polarisation channel arrangement.

Prenos in multipleksiranje (TM) – Digitalni radiorelejni sistemi (DRRS) – Fiksna oprema točka-točka DRRS za prenos digitalnih signalov in analognega video signala, ki deluje v frekvenčnih pasovih 10 GHz in 14 GHz izmenoma z 20 MHz-nim razmikom kanalov

General Information

• Status: Published
• Publication Date: 30-Nov-2003
• Withdrawal Date: 30-Sep-2003
• ICS: 33.040.20 - Transmission systems
• ICS: 33.060.30 - Radio relay and fixed satellite communications systems
• Technical Committee: RES - Radio equipment and systems
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Ref Project: ETSI ETS 300 638 ed.1 (1996-11) - Transmission and Multiplexing (TM); Digital Radio Relay Systems (DRRS); Fixed point-to-point radio link equipment for the transmission of digital signals and analogue video signal operating in the frequency bands 10 GHz and 14 GHz with 20 MHz alternate channel spacing

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 638 E1:2003
01-december-2003
3UHQRVLQPXOWLSOHNVLUDQMH70±'LJLWDOQLUDGLRUHOHMQLVLVWHPL'556±)LNVQD
RSUHPDWRþNDWRþND'556]DSUHQRVGLJLWDOQLKVLJQDORYLQDQDORJQHJDYLGHR
VLJQDODNLGHOXMHYIUHNYHQþQLKSDVRYLK*+]LQ*+]L]PHQRPD]0+]QLP
UD]PLNRPNDQDORY
Transmission and Multiplexing (TM); Digital Radio Relay Systems (DRRS); Fixed point-to
-point radio link equipment for the transmission of digital signals and analogue video
signal operating in the frequency bands 10 GHz and 14 GHz with 20 MHz alternate
channel spacing
Ta slovenski standard je istoveten z: ETS 300 638 Edition 1
ICS:
33.040.20 Prenosni sistem Transmission systems
33.060.30 Radiorelejni in fiksni satelitski Radio relay and fixed satellite
komunikacijski sistemi communications systems
SIST ETS 300 638 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST ETS 300 638 E1:2003

---------------------- Page: 2 ----------------------

SIST ETS 300 638 E1:2003
EUROPEAN ETS 300 638
TELECOMMUNICATION November 1996
STANDARD
Source: ETSI TC-TM Reference: DE/TM-04022
ICS: 33.060.30
Key words: Point-to-point, radio, transmission, DRRS, SDH
Transmission and Multiplexing (TM);
Digital Radio Relay Systems (DRRS);
Fixed point-to-point radio link equipment for the
transmission of digital signals and analogue video signal
operating in the frequency bands 10 GHz and 14 GHz
with 20 MHz alternate channel spacing
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [e-mail]
Tel.: [phone] - Fax: [phone]
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1996. All rights reserved.

---------------------- Page: 3 ----------------------

SIST ETS 300 638 E1:2003
Page 2
ETS 300 638: November 1996
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.

---------------------- Page: 4 ----------------------

SIST ETS 300 638 E1:2003
Page 3
ETS 300 638: November 1996
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Abbreviations and symbols .8
3.1 Abbreviations .8
3.2 Symbols .9
4 General characteristics (digital and analogue).9
4.1 Frequency bands and channel arrangements .9
4.1.1 Alternate channel spacing .9
4.1.2 Transmit/receive minimum separation .9
4.1.3 Transmit/receive duplex frequency separation .9
4.2 Compatibility requirements between systems.9
4.3 Types of installation .10
4.3.1 Environmental conditions .10
4.3.1.1 Equipment within weatherprotected locations .10
4.3.1.2 Equipment for non-weatherprotected locations.10
4.3.2 ElectroMagnetic Compatibility (EMC).11
4.4 System block diagram .11
4.5 TMN interface .11
4.6 Power supply.11
4.7 Receiver Intermediate frequency.12
5 Parameters for digital systems.12
5.1 Transmission capacity .12
5.2 Applications.12
5.3 Baseband parameters .12
5.3.1 Plesiochronous interfaces .12
5.3.2 SDH baseband interface .12
5.4 Transmitter characteristics .12
5.4.1 Transmitter power range .12
5.4.2 Automatic Transmit Power Control (ATPC) .12
5.4.3 RF spectrum.13
5.4.3.1 RF spectrum mask .13
5.4.3.2 Spectral line at the symbol rate .14
5.4.4 Spurious emissions .14
5.4.4.1 Spurious emissions-external .15
5.4.4.2 Spurious emissions-internal .15
5.4.5 Radio frequency tolerance .15
5.5 Receiver characteristics.16
5.5.1 Input level range.16
5.5.2 Spurious emissions .17
5.5.2.1 Spurious emissions external.17
5.5.2.2 Spurious emissions-internal .18
5.6 System characteristics without diversity .18
5.6.1 BER performance.18
5.6.2 Equipment background BER.18
5.6.3 Interference sensitivity.18
5.6.4 Distortion sensitivity.19
5.7 System characteristics with diversity .19
5.7.1 Differential delay compensation .19
5.7.2 BER performance.19
6 Parameters for wideband analogue systems .19

---------------------- Page: 5 ----------------------

SIST ETS 300 638 E1:2003
Page 4
ETS 300 638: November 1996
6.1 Transmit/receive capacity . 19
6.1.1 Applications . 20
6.2 Baseband parameters. 20
6.2.1 Video Interfaces. 20
6.2.2 Audio interface (if applicable) . 20
6.2.3 Digital interface (if applicable). 20
6.2.4 IF interface (if applicable) . 20
6.2.5 Transmission performance. 20
6.3 Transmitter characteristics. 20
6.3.1 Transmitter power range . 20
6.3.2 Transmitter output power tolerance. 20
6.3.3 Radiated spectrum. 21
6.3.3.1 Spectrum masks . 21
6.3.3.2 Frequency deviation. 21
6.3.4 Spurious emissions. 22
6.3.4.1 Spurious emissions-external. 22
6.3.4.2 Spurious emissions-internal. 22
6.3.5 Radio frequency tolerance. 23
6.4 Receiver characteristics . 23
6.4.1 Input level range . 23
6.4.2 Spurious emissions. 23
6.4.2.1 Spurious emissions-external. 23
6.4.2.2 Spurious emissions-internal. 23
6.4.3 Noise figure. 23
6.5 System performance. 24
6.5.1 Receiver threshold. 24
6.5.2 Interference sensitivity . 24
Annex A (informative): Automatic Transmit Power Control (ATPC). 25
Annex B (informative): Example of a channel plan for 20 MHz alternate channel spacing in the
10 GHz and 14 GHz frequency band. 26
History. 27

---------------------- Page: 6 ----------------------

SIST ETS 300 638 E1:2003
Page 5
ETS 300 638: November 1996
Foreword
This European Telecommunication Standard (ETS) has been produced by the Transmission and
Multiplexing (TM) Technical Committee of the European Telecommunications Standards Institute (ETSI).
This ETS contains the minimum technical requirements to ensure compatibility of products and
conformance with radio regulations across ETSI member states. Radio terminals from different
manufacturers are not required to interwork at radio frequency (i.e. no common air interface). However,
terminals may be combined with other manufacturers equipment on a Radio Frequency (RF) branching
network for operation on different polarizations.
This ETS defines the requirements of radio terminal and radio relay equipment and associated interfaces.
The requirements for multiplex, network management and antenna/feeder equipment may be addressed
elsewhere.
Transposition dates
Date of adoption of this ETS: 25 October 1996
Date of latest announcement of this ETS (doa): 28 February 1997
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 August 1997
Date of withdrawal of any conflicting National Standard (dow): 31 August 1997

---------------------- Page: 7 ----------------------

SIST ETS 300 638 E1:2003
Page 6
ETS 300 638: November 1996
Blank page

---------------------- Page: 8 ----------------------

SIST ETS 300 638 E1:2003
Page 7
ETS 300 638: November 1996
1 Scope
This European Telecommunication Standard (ETS) covers the minimum performance requirements for
terrestrial fixed services radio communications equipment, as given below, in bands in the frequency
ranges 10 GHz and 14 GHz using 20 MHz channel spacing.
This ETS is applicable in those countries where the frequency plan in these bands is based on a 20 MHz
spacing; it does not prevent the development of future ETSs for equipment operated in these bands using
a different channel plan.
This ETS does not cover aspects related to test procedures and test conditions which are in the scope of
another ETS under study in TM4.
The parameters specified fall into two categories:
a) those required to provide compatibility between channels from different sources of equipment on
the same route, connected either to separate antennas, or to separate polarizations of the same
antenna. This category also includes parameters providing compatibility with the existing radio-relay
network;
b) parameters defining the transmission quality of the proposed systems.
The standardization includes the following specifications:
- transmitter and receiver characteristics;
- baseband and RF interface characteristics;
- diversity system characteristics.
As regards Synchronous Digital Hierarchy (SDH) systems, the Section Overhead (SOH) processing is
covered in CCIR Recommendation 750 [8].
Safety aspects are outside the mandate ot ETSI and they will not be considered in this ETS.
2 Normative references
This ETS incorporates by dated or undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this ETS only when incorporated in it by amendment or revision. For undated references, the
latest edition of the publication referred to applies.
[1] ETS 300 019 (1994): "Equipment Engineering (EE); Environmental conditions
and environmental tests for telecommunications equipment".
[2] ETS 300 132: "Equipment Engineering (EE); Power supply interface at the input
to telecommunications equipment".
[3] ETS 300 385 (1995): "Radio Equipment and Systems (RES); " ElectroMagnetic
Compatibility (EMC) Standard for digital fixed radio links and ancillary equipment
with data rates at around 2 Mbit/s and above".
[4] CCIR Recommendation 401-2: "Frequencies and deviations of continuity pilots
for frequency modulation radio-relay systems for television and telephony".
[5] CCIR Recommendation 403-3: "Intermediate frequency characteristics for the
interconnection of analogue radio-relay systems".
[6] CCIR Recommendation 405-1: "Pre-emphasis characteristics for frequency
modulation radio-relay systems for television".

---------------------- Page: 9 ----------------------

SIST ETS 300 638 E1:2003
Page 8
ETS 300 638: November 1996
[7] CCIR Recommendation 746: "Radio - Frequency channel arrangements for
radio-relay systems - Annex 7: Description of the radio-frequency channel
arrangement in the frequency band 14,25-14,5 GHz using a 20 MHz channel
spacing".
[8] CCIR Recommendation 750: "Architectures and functional aspects of
radio-relay systems for SDH-based networks".
[9] CCIR Recommendation 751: "Transmission characteristics and performance
requirements of radio-relay systems for SDH-based networks".
[10] ITU-T Recommendation J.61: "Transmission performance of television circuits
designed for use in international connections".
[11] ITU-T Recommendation J.21: "Performance characteristics of 15 kHz-type
sound-programme circuits - Circuits for high quality monophonic and
stereophonic transmissions".
[12] CCITT Recommendation G.703: "Physical/electrical characteristics of
hierarchical digital interfaces".
[13] ITU-T Recommendation G.707: "Network node interface for the Synchronous
Digital Hierarchy".
[14] ITU-T Recommendation G.773: "Protocol suites for Q-interfaces for
management of transmission systems".
[15] ITU-T Recommendation G.784: "Synchronous Digital Hierarchy (SDH)
management".
3 Abbreviations and symbols
3.1 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
ATPC Automatic Transmitter Power Control
BB BaseBand
BER Bit Error Rate
C/I Carrier to Interference Ratio
CW Continuous Wave
DRRS Digital Radio-Relay System
EMC ElectroMagnetic Compatibility
IF Intermediate Frequency
IF/RF Intermediate Frequency/Radio Frequency
LO Local Oscillator
PDH Plesiochronous Digital Hierarchy
PRBS Pseudo-Random Binary Sequence
RF Radio Frequency
RSL Received Signal Level
RX Receive (Receiver)
SDH Synchronous Digital Hierarchy
S/I Signal to Interference Ratio
SRL Spectrum Reference Level
STM-1 Synchronous Transport Module-level 1
TMN Telecommunications Management Network
TX Transmit (Transmitter)

---------------------- Page: 10 ----------------------

SIST ETS 300 638 E1:2003
Page 9
ETS 300 638: November 1996
3.2 Symbols
For the purposes of this ETS, the following symbols apply:
dB decibel
dBm decibel relative to 1 mW
GHz Gigahertz
km kilometre
Mbit/s Mega-bit per second
MHz Megahertz
m/s metres per second
ppm parts per million
ns nanosecond
W/m² Watts per square metre
4 General characteristics (digital and analogue)
4.1 Frequency bands and channel arrangements
The systems shall be required to operate in the frequency bands 10 GHz or 14 GHz using a channel
spacing of 20 MHz according to ITU-R Recommendation 746 [7].
NOTE: A typical application of ITU-R Recommendation 746 [7] is shown in annex B.
4.1.1 Alternate channel spacing
See subclause 4.2, a).
Table 1a: Digital systems
Minimum bit rate (Mbit/s) 2 x 34 2 x 45 2 x 51
(note) (note)
Channel spacing (MHz) 20 20 20
NOTE: In order to achieve good efficiency a minimum gross
bit rate of about 90 Mb/s is envisaged; therefore
n x 2 Mbit/s way side traffic in Plesiochronous Digital
Hierarchy (PDH) systems is considered.
Table 1b: Analogue systems
Video baseband (MHz)
≤ 10
Channel spacing (MHz) 20
4.1.2 Transmit/receive minimum separation
The minimum separation between the centre frequencies of the closest go and return radio channels shall
be 30 MHz.
4.1.3 Transmit/receive duplex frequency separation
The transmitter receiver duplex frequency separation should be approximately half of the allocated
frequency band. An example of a national channel plan in use is given in annex B for information.
4.2 Compatibility requirements between systems
a) Systems operating on common hops will normally use the same double polarized antenna;
b) there should be no requirement to operate transmitting equipment from one manufacturer with
receiving equipment from another;

---------------------- Page: 11 ----------------------

SIST ETS 300 638 E1:2003
Page 10
ETS 300 638: November 1996
c) there should be no requirement to multiplex equipment from different manufacturers on the same
polarization of the same antenna.
4.3 Types of installation
Both indoor and partially outdoor installations are considered.
Single RF channel links connected to different polarizations of the same antenna via a polarization
duplexer (mainly in a partially outdoor configuration) as well as multi RF channel links with classical RF
filter channel branching units are anticipated.
4.3.1 Environmental conditions
The equipment shall be required to meet either the environmental conditions set out in ETS 300 019,
part 1-3 and part 1-4 [1], which define weatherprotected and non-weatherprotected locations, classes and
test severities, or one of the conditions listed in subclause 4.3.1.2.
4.3.1.1 Equipment within weatherprotected locations
The most important climatic parameters for the five classes defined are given in table 2.
Table 2: Climatic parameters (weatherprotected)
Climatic class 3.1 3.2 3.3 3.4 3.5
High air temperature (°C) +40 +45 +55 +70 +40
Low air temperature (°C) [phone]
High relative humidity (%) 85 95 100 100 100
Low relative humidity (%) 5 5 10 10 10
Air movement (m/s) 5 5 5 5 5
Solar radiation (W/m²) 700 700 1x 1x -
For equipment designed for stationary use in weatherprotected locations (indoor installation), only classes
3.1 or 3.2 shall apply (see ETS 300 019, part 1-3 [1]).
4.3.1.2 Equipment for non-weatherprotected locations
This type of equipment is generally described as "outdoor" equipment. Class 4.1 or extended class 4.1E
parameters should be applied. Class 4.1 applies to many European countries and class 4.1E applies to
them all. The most important parameters values are given in table 3.
Table 3: Climatic parameters (non-weatherprotected)
Climatic class 4.1 4.1E
+40 +45
High air temperature (°C)
-33 -45
Low air temperature (°C)
High relative humidity (%) 100 100
Low relative humidity (%) 15 8
Air movement (m/s) +50 +50
Solar radiation (W/m²) 1x 1x
It should be noted that radio cabinets supplied with a system will be "weather protected" including full
protection against precipitation and wind. Climatic classes 3.3, 3.4 and 3.5 (subclause 4.3.1.1) may,
therefore, also be applicable to equipment in outdoor locations.
The operation of the outdoor equipment in accordance with class 4.1E shall not be mandatory for all users
of this ETS.
Some users of this ETS may also decide to apply one of the alternative parameters given in table 4.

---------------------- Page: 12 ----------------------

SIST ETS 300 638 E1:2003
Page 11
ETS 300 638: November 1996
Table 4: Alternative climatic parameters
Climatic class 4.1 4.1E
High air temperature (°C) +40 +50
Low air temperature (°C) -20 -30
High relative humidity (%) 90 90
Low relative humidity (%) 5 5
Air movement (m/s) +50 +50
Solar radiation (W/m²) 1x 1x
4.3.2 ElectroMagnetic Compatibility (EMC)
Digital systems shall operate under the conditions specified in the relevant EMC Standard for digital fixed
links and ancillary equipment ETS 300 385 [3].
4.4 System block diagram
Branching
A' B' C'
Z' E' D'
Modulator
Feeder
Transmitter Network
RF Tx Filter
(note 1)
Branching
D C A
B E Z
Network
Receiver Demodulator
RF Rx Filter
Feeder
(note 1)
MAIN RECEIVER PATH (note 2) (note 2)
Branching
Dd Cd Bd Ad Ed
Network
Feeder
RF Rx Filter Receiver
Demodulator
(note 1)
DIVERSITY RECEIVER PATH
NOTE 1: No filtering included.
NOTE 2: Connection at RF, Intermediate Frequency (IF) or baseband.
Figure 1: System block diagram
4.5 TMN interface
For SDH equipment a Telecommunications Management Network (TMN) interface required by a user
should follow ETSI, TM2 and TM3 recommendations in accordance with ITU-T Recommendations
G.784 [15] and G.773 [14] and CCIR Recommendations 750 [8] and 751 [9]. For as Plesiochronous
Digital Hierarchy (PDH) equipment the TMN interface is under study.
4.6 Power supply
The equipment shall operate from one or more of the supply voltages within the ranges specified in
ETS 300 132 [2].

---------------------- Page: 13 ----------------------

SIST ETS 300 638 E1:2003
Page 12
ETS 300 638: November 1996
4.7 Receiver Intermediate frequency
The intermediate frequency, if accessible as a measurement point, shall be 70 MHz or 140 MHz.
5 Parameters for digital systems
5.1 Transmission capacity
Bit rates: 2 x 34 Mbit/s, 2 x 45 Mbit/s, 2 x 51 Mbit/s (sub-STM-1). Way-side traffic of n x 2 Mbit/s is also
considered for PDH systems.
For the transport of compressed digital video signals multiple lower bit rate signals (e.g. n x 8 Mb/s) are
envisaged as payloads, leading to similar gross transmission bit rates.
In the following, the 2 x 34 Mbit/s and 2 x 45 Mbit/s systems will be indicated as PDH systems and the
2 x 51 Mbit/s system as an SDH system.
5.2 Applications
Medium capacity point-to-point local and regional networks, digital TV.
5.3 Baseband parameters
5.3.1 Plesiochronous interfaces
Plesiochronous interfaces shall comply with ITU-T Recommendation G.703 [12]. Service channels are
outside the scope of this ETS.
5.3.2 SDH baseband interface
Whenever a synchronous interface is required for 2 x 51 Mbit/s (sub-Synchronous Transport Module -
level 1 (STM-1)) systems, this shall be a standard STM-1 (ETSI TM3, VC4 - based) interface.
5.4 Transmitter characteristics
5.4.1 Transmitter power range
Nominal output power at point C' of the system block diagram (figure 1) shall be in the range +24 to
+28 dBm.
A capability for output power level adjustment shall be provided. The range of this transmitter adjustment
shall not be less than 20 dB, adjustable in increments of 5 dB or less.
The tolerance of the nominal output power shall be within:
± 3 dB: class 4.1E (subclause 4.3.1.2);
± 2 dB: all other classes (subclause 4.3.1.1 and 4.3.1.2.).
NOTE: Limitation of the output power level in the band 10.6-10.68 shall be taken into account
according to Radio Regulations, article 8 footnote 831 (maximum EIRP = 40 dBW and
the power delivered to the antenna shall not exceed -3 dBW).
5.4.2 Automatic Transmit Power Control (ATPC)
ATPC is an optional feature; information on ATPC is given in annex A.
The ATPC range shall not exceed 15 dB. When compatibility with analogue systems is required, the
lowest power amplifier output level shall not be less than + 10 dBm; this may result in a reduced ATPC
range.

---------------------- Page: 14 ----------------------

SIST ETS 300 638 E1:2003
Page 13
ETS 300 638: November 1996
5.4.3 RF spectrum
5.4.3.1 RF spectrum mask
The equipment shall comply with the digital RF power spectrum masks given in figure 2a or 2b as
applicable.
Spectral lines at ± symbol rate from the central carrier frequency may fall outside these masks.
+1
(dB)
0
-10
-20
-30
Power density
relative to carrier
-40
frequency
-50
-60
-65
-70
-80
914
50
45
0 5 10 15 20 25 30 35 40
Frequency from actual carrier frequency
(MHz)
Figure 2a: Limits of spectral power density
The mask shall be measured with a modulating baseband signal. In the case of a PDH interface, a
23
Pseudo-Random Binary Sequence (PRBS) of 2 - 1 at each input port shall be used. In the case of a
SDH interface, a STM-1 test signal shall be defined.
The 0 dB level shown on the spectrum masks relates to the spectral power density of the nominal centre
frequency disregarding residual carrier. The spectrum mask does not include frequency tolerance.
For the 14 GHz band, where the centre gap is 30 MHz, a mask is specified for the innermost edges of the
centre gap channels 6 and 1' (referenced to point B'). The mask is shown in figure 2b.

---------------------- Page: 15 ----------------------

SIST ETS 300 638 E1:2003
Page 14
ETS 300 638: November 1996
+1
(dB)
0
-10
-20
-30
Power density
-40
relative to carrier
frequency
-50
-60
-70
-80
-90
-95
-100
914
0 5 10 15 20 25 30 35 40 45 50
(MHz)
Frequency from actual carrier frequency
Figure 2b: Limits of spectral power density for the innermost channels, 14 GHz
The spectrum analyser settings for measuring the RF spectrum mask detailed in figures 2a and 2b are
shown in table 5.
Table 5: Spectrum analyser settings for RF power spectrum measurement for digital systems
IF bandwidth (kHz) 100
Video Bandwidth (kHz) 0,3
Total scan time (s) 20
Total sweep width (MHz) 200
5.4.3.2 Spectral line at the symbol rate
The power level (reference point B') of spectral lines at a distance from the channel centre frequency
equal to the symbol rate shall be less than -37 dBm.
5.4.4 Spurious emissions
It is necessary to define spurious emissions from transmitters for two reasons:
a) to limit interference into systems operating wholly externally to the system;
b) to limit local interference within the system where transmitters and receivers are directly connected
via the filter and branching systems.
This leads to two sets of spurious emission limits where the specific limits given for "internal" interference
are required to be no greater than the "external" level limits at point C'.

---------------------- Page: 16 ----------------------

SIST ETS 300 638 E1:2003
Page 15
ETS 300 638: November 1996
5.4.4.1 Spurious emissions-external
According to ITU-R the external spurious emissions are defined as emissions at frequencies which are
outside the nominal carrier frequency ± 250 % of the relevant channel spacing.
The frequency range in wh
...