IEC 60489-6:1999

INTERNATIONAL IEC
STANDARD
60489-6
Third edition
1999-07
Radio equipment used in mobile services –
Methods of measurement –
Part 6:
Data equipment
Matériel de radiocommunication utilisé dans les services
mobiles – Méthodes de mesure –
Partie 6:
Matériel numérique
Reference number
Numbering
As from 1 January 1997 all IEC publications are issued with a designation in the
60000 series.
Consolidated publications
Consolidated versions of some IEC publications including amendments are
available. For example, edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the
base publication, the base publication incorporating amendment 1 and the base
publication incorporating amendments 1 and 2.
Validity of this publication
The technical content of IEC publications is kept under constant review by the IEC,
thus ensuring that the content reflects current technology.
Information relating to the date of the reconfirmation of the publication is available
in the IEC catalogue.
Information on the subjects under consideration and work in progress undertaken
by the technical committee which has prepared this publication, as well as the list
of publications issued, is to be found at the following IEC sources:
• IEC web site*
•
Catalogue of IEC publications
Published yearly with regular updates
(On-line catalogue)*
• IEC Bulletin
Available both at the IEC web site* and as a printed periodical
Terminology, graphical and letter symbols
For general terminology, readers are referred to IEC 60050: International
Electrotechnical Vocabulary (IEV).
For graphical symbols, and letter symbols and signs approved by the IEC for
general use, readers are referred to publications IEC 60027: Letter symbols to be
used in electrical technology, IEC 60417: Graphical symbols for use on equipment.
Index, survey and compilation of the single sheets and IEC 60617: Graphical symbols
for diagrams.
* See web site address on title page.

INTERNATIONAL IEC
STANDARD
60489-6
Third edition
1999-07
Radio equipment used in mobile services –
Methods of measurement –
Part 6:
Data equipment
Matériel de radiocommunication utilisé dans les services
mobiles – Méthodes de mesure –
Partie 6:
Matériel numérique
 IEC 1999  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http://www.iec.ch
Commission Electrotechnique Internationale
PRICE CODE
XG
International Electrotechnical Commission
For price, see current catalogue

– 2 – 60489-6 © IEC:1999(E)
CONTENTS
Page
FOREWORD . 4
Clause
1 General.5
1.1 Scope and object . 5
1.2 Emission characteristics.5
1.3 System characteristics.6
1.4 Normative references.7
2 Terms and definitions. 7
3 Test conditions.12
3.1 Standard test conditions. 12
3.2 Supplementary test conditions. 12
3.3 Characteristics of the measuring equipment . 18
4 Measurements of receiver-decoder radio-frequency parameters . 22
4.1 Sensitivity (data).22
4.2 Adjacent radio-frequency signal selectivity (data). 24
4.3 Co-channel interference rejection (data) . 28
4.4 Adjacent-channel selectivity (data) . 28
4.5 Spurious response immunity (data) . 28
4.6 Intermodulation immunity (data) . 32
4.7 Sensitivity under multipath propagation conditions (data) . 36
4.8 Acceptable radio-frequency displacement (data). 39
4.9 Impulsive-noise tolerance (data). 41
5 Measurements of receiver-decoder radio-frequency parameters (selective calling only). 45
5.1 Protection from radio-frequency intermodulation false operation (selective calling). 45
5.2 False responses due to noise (selective calling) . 46
5.3 Signalling attack time (selective calling) . 48
5.4 Recovery time (selective calling) . 48
5.5 Required protection time (selective calling). 49
5.6 Signal-to-residual output-power ratio (selective calling). 49
6 Measurements of receiver-decoder conducted and radiated spurious components . 50
6.1 Conducted spurious components (data and selective calling). 50
6.2 Radiated spurious components (data) . 51
7 Measurements of encoder-transmitters radio-frequency parameters . 51
7.1 Frequency error (data) . 51
7.2 Average radio-frequency output power (data) . 55
7.3 Spurious narrow bandwidth radio-frequency emission power (data). 56
7.4 Adjacent and alternate channel power (data) . 58
8 Audio-frequency band measurements of encoder output characteristics
(selective calling) . 6 5
8.1 Tone pulse-rise time (selective calling). 65
8.2 Tone pulse duration (selective calling). 65
8.3 Tone pulse-decay time (selective calling) . 66

60489-6 © IEC:1999(E) – 3 –
Clause Page
8.4 Frequency of tone(s) (selective calling) . 66
8.5 RMS voltage of tone(s) (selective calling) . 67
8.6 Encoder overall operate time (selective calling) . 67
9 Audio-frequency band measurements of decoder characteristics (selective calling). 68
9.1 Decoder operation level range (selective calling) . 68
9.2 Decoder attack time (selective calling) . 68
9.3 Decoder recovery time (selective calling). 68
9.4 Decoder required protection time (selective calling) . 69
9.5 Decoder alarm time (selective calling) . 69
10 Overall measurements in simulated systems (selective calling). 70
10.1 General.70
10.2 Supplementary conditions of measurement for system response times . 70
10.3 System overall operate time (selective calling). 70
10.4 System recovery time (selective calling) . 70
11 Measurements of receiver-decoder radio-frequency parameter (integral antenna) . 71
11.1 Radiation sensitivity (data) . 71
11.2 Selectivity (data).74
11.3 Acceptable radio-frequency displacement. 74
11.4 Impulsive-noise tolerance (integral antenna). 74
12 Measurements of encoder-transmitters radio-frequency parameters (integral antenna) . 75
12.1 Radiated radio-frequency power (data) . 75
Annex A (normative) Examples of combining networks. 89
Annex B (normative) Recommended characteristics of measuring equipment
and methods of test. 92
Annex C (normative) Rayleigh fading simulator . 94
Annex D (informative) Intermodulation response . 100
Annex E (normative) Accuracy and dispersion of methods of measurement and compliance
tests for sensitivity (data and selective calling) and degradation
measurements (data and selective calling) . 101
Annex F (normative) Mean time between false calling responses (M) (selective calling) . 133
Annex G (normative) General information on impulsive noise and random impulse
generator . 136
Annex H (informative) Example of a mains power line impedance stabilization network . 142
Annex I (informative) Measuring error of the occupied bandwidth centre frequency
using spectrum analyser. 145

– 4 – 60489-6 © IEC:1999(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
RADIO EQUIPMENT USED IN MOBILE SERVICES –
METHODS OF MEASUREMENT –
Part 6: Data equipment
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 organization.
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
form 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 extend 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 60489-6 has been prepared by IEC technical committee 102:
Equipment used in radio communications for mobile services and for satellite communication
systems.
This third edition of IEC 60489-6 cancels and replaces the second edition, published in 1987,
amendment 1 (1989) and amendment 2 (1991). This third edition constitutes a technical
revision.
The text of this standard is based on the following documents:
FDIS Report on voting
102/44/FDIS 102/54/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.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.
IEC 60489-6 forms one of a series of publications under the general title: Radio equipment
used in mobile services – Methods of measurement. Future standards in this series will carry
the new general title as cited above. Titles of existing standards in this series will be updated at
the time of the next revision.
Annexes A, B, C, E, F and G form an integral part of this standard.
Annexes D, H and I are for information only.
A bilingual version of this standard may be issued at a later date.

60489-6 © IEC:1999(E) – 5 –
RADIO EQUIPMENT USED IN MOBILE SERVICES –
METHODS OF MEASUREMENT –
Part 6: Data equipment
1 General
1.1 Scope and object
This part of IEC 60489 refers specifically to mobile radio transmitters and receivers for the
transmission of data (telegraphy) signals having the emission characteristics given in 1.1.
This standard is intended to be used in conjunction with IEC 60489-1. The terms and
definitions and the conditions of measurement set forth in this standard are intended for type
and acceptance tests.
The object of this standard is to standardize the definitions, the conditions and the methods of
measurement used to ascertain the radio-frequency performance of data and selective call
equipment, thus making possible meaningful comparisons of the results of measurements
made by different observers and on different equipment.
This standard will cover the following types of data signals:
– bit streams;
– character strings;
– messages;
– selective calling.
Selective calling differs from messages in their intended functions; it may be considered as
data signals, analogous to messages transmitting only the information required to activate an
alarm on one receiver or a group of receivers.
The methods of measurements for the radio-frequency parameters are appropriate for the four
types of data signals.
To differentiate between the radio-frequency parameters (e.g. adjacent channel power,
frequency error) measured in this standard from those in associated standards, the name of
each parameter is followed by either “(bit stream)” or “(character string)” or “(message)” or
“(selective calling)”. After each radio-frequency parameter the general term “(data)” is used.
When each equipment is measured, the proper data type “(bit stream)” “(character string)”
“(message)” or “(selective calling)” will be substituted for “(data)”.
1.2 Emission characteristics
This standard is applicable to the following emission characteristics expressed according to the
ITU Radio Regulations Emission Designation.
Emission characteristics are expressed by four symbols:
a) – b) – c) – d)
where
a) is the type of modulation of the main carrier;

– 6 – 60489-6 © IEC:1999(E)
b) is the nature of signals modulating the main carrier;
c) is the type of information to be transmitted;
d) is the detail of signal(s) (optional).
a) Type of modulation of the main carrier (first symbol):
(A) double-sideband;
(H) single-sideband, full carrier;
(R) single-sideband, reduced or variable level carrier;
(J) single-sideband, suppressed carrier;
(F) frequency modulation;
(G) phase modulation.
b) Nature of signal(s) modulating the main carrier (second symbol):
(1) a single channel containing quantized or digital information without the use of a
modulating sub-carrier;
(2) a single channel containing quantized or digital information with the use of a
modulating sub-carrier;
(3) two or more channels containing quantized or digital information.
c) Type of information to be transmitted (third symbol):
(A) telegraphy – for aural reception;
(B) telegraphy – for automatic reception;
(C) facsimile;
(D) data transmission, telemetry or telecommand.
d) Details of signal(s) (fourth symbol, optional):
(A) two-condition code with elements of differing numbers and/or durations;
(B) two-condition code with elements of the same number and duration without error-
correction;
(C) two-condition code with elements of the same number and duration with error-
correction;
(D) four-condition code in which each condition represents a signal element (of one or
more bits);
(E) multi-condition code in which each condition represents a signal element (of one or
more bits);
(F) multi-condition code in which each condition or combination of conditions
represents a character.
NOTE – See ITU Radio Regulations (edition 1982), Article 4 and Appendix 6 (AP6, part A) for details and definition
of the emission characteristics.
1.3 System characteristics
1.3.1 Transmitter
The transmitters that are measured using the methods in this standard may be capable of
simultaneously transmitting two or more data signals or voice and a data signal. The
operational characteristics of the system in which the transmitter will be used will establish if
the transmitter will be required to simultaneously transmit several types of signals.
Many of the systems that require the transmitter to transmit both analogue voice and data
arrange it so that either voice or data are transmitted, but not simultaneously. In this instance
this standard would be used to measure the transmitter radio-frequency parameters with the
transmitter in the data mode only. IEC 60489-2 should be used to measure the radio-frequency
parameters with the transmitter in the analogue voice mode.

60489-6 © IEC:1999(E) – 7 –
When the system requires that the transmitter transmit simultaneously more than one signal,
the radio-frequency parameters will be measured with the transmitter transmitting only the
maximum number of simultaneous signals required by the system. For example, a transmitter
may be capable of transmitting three types of signals, but the system may require under some
circumstances that two signals be transmitted simultaneously and, at all other times, only one
signal will be transmitted. In this case, the measurements should be made while the transmitter
is transmitting the two simultaneous signals.
When the system requires that input signals, other than the data signal to be used in the
measurement, be applied simultaneously with the data signal to the transmitter under test, they
should be applied to the proper port and at the signal levels specified by the manufacturer. The
measurements in this standard will then be made using simultaneously the data signal and the
other required signals (see figure 1).
1.3.2 Receiver
In this standard, the subclauses entitled “Method of measurement” are designed to measure
the value of a radio-frequency parameter. In some cases, it is only necessary to determine if
the receiver-decoder is compliant with the radio-frequency parameter specification. This can
usually be done more simply and with less effort than measuring the radio-frequency
parameter. For the more frequently measured radio-frequency parameters, a compliance test
method is included in the appropriate clauses. The specified value for the radio-frequency
parameter will be the appropriate value specified by a regulation, contract or equipment
specification.
The degradation measurements for receivers (4.3 to 5.1) requires the knowledge of the
sensitivity. This sensitivity is used to derive a value for the wanted signal level. In one case, the
sensitivity to use is the measured usable sensitivity – MUS – (determined according to 4.2 for
every equipment under test). Alternatively, it is possible to use the specified usable sensitivity –
SUS – applicable for a set of equipment.
According to the type of measurement performed, it is necessary to add, immediately after the
name of each measured parameter, either “(referred to MUS)” or “(referred to SUS)”.
1.4 Normative references
The following normative documents contain provisions which, through reference in this text,
constitute provisions of this part of IEC 60489. For dated references, subsequent amendments
to, or revisions of, any of these publications do not apply. However, parties to agreements
based on this part of IEC 60489 are encouraged to investigate the possibility of applying the
most recent editions of the normative documents indicated below. For undated references, the
latest edition of the normative document referred to applies. Members of IEC and ISO maintain
registers of currently valid International Standards.
IEC 60050(721), International Electrotechnical Vocabulary – Chapter 721: Telegraphy,
facsimile and data communication
IEC 60489-1, Methods of measurement for radio equipment used in the mobile services –
Part 1: General definitions and standard conditions of measurement
IEC 60489-2, Methods of measurement for radio equipment used in the mobile services –
Part 2: Transmitters employing A3E, F3E or G3E emissions
2 Terms and definitions
For the purpose of this part of IEC 60489, the definitions given in IEC 60489-1, as well as the
following supplementary definitions, apply.

– 8 – 60489-6 © IEC:1999(E)
2.1
average frequency
number of positive (or negative) going zero crossings of the signal divided by the total time
duration of the measurement
2.2
binary digit bit
member of a set of two elements commonly used to represent information [IEV 721-02-08]
2.3
bit rate
number of bits transmitted per unit of time, expressed in bit/s, kbit/s or Mbit/s
2.4
bit stream
continuous series of bits
2.5
character
member of a set of elements agreed upon to be used for organization, representation or control
of information
NOTE – Characters may be letters, digits, punctuation marks or other symbols and, by extension, function controls
such as space shift, carriage return or line feed contained in a message.
[IEV 721-03-09]
2.6
character string
character or sequence of characters
2.7
comparator (data)
2.7.1
comparator (bit stream or character string)
device capable of
– storing a reference sequence of bits or characters,
– counting the number of bits or characters that are transmitted,
– comparing the bits or characters received with the reference sequence of bits or characters,
– counting the number of correctly received bits or characters
2.7.2
comparator (message or selective calling)
device or person capable of
– storing a reference message or call,
– counting the number of times a message or a call is transmitted,
– comparing the message or the call received with the reference message or call,
– counting the number of correctly received message or calls
2.8
data
information represented in a manner suitable for automatic processing
[IEV 721-01-02]
60489-6 © IEC:1999(E) – 9 –
2.9
data source
device that generates the standard baseband test signals in the form of an electrical signal. For
character and messages, this is normally specified by the equipment manufacturer
2.10
decoder
device, which may be in the receiver, that translates the demodulated signal into the intended
output signal.
For selective calling, the output signal is only an alarm, indicating that any or all receivers and
their associated decoders have received their intended coded signals
NOTE – The alarm may be a lamp, a “bleep” generated within the decoder, a vibrator, or only the opening of a mute
or squelch circuit. The latter is usually indicated by an increase in the residual noise level at the output of the
receiver.
2.11
encoder
device which translates a group of input signals into a unique group of output signals suitable
for transmission (see figure 1)
NOTE – Examples of functions that may be involved are
– addition of synchronization bits,
– addition of error correction bits,
– parallel/serial conversion,
– amplitude and phase shaping.
2.12
erroneous bit, character or message
any decoded bit, character or message that is not the same as the transmitted bit, character or
message
2.13
error
failure to decode correctly the intended transmitted bit, character, message or selective calling
NOTE – Another type of error is the reception of data in the absence of any intended transmission (false reception).
The mean time between two successive false receptions is generally so high that a measurement would be
impractical; this parameter is estimated by calculation.
2.14
error ratio
number of erroneous bits, character messages or selective callings received, divided by the
total number of bits, characters, messages or selective callings transmitted, respectively.
For selective calling (1 – error ratio) is also called “calling probability”
2.15
message
group of characters and function control sequences which is transferred as an entity from a
transmitter to a receiver, where the arrangement of the characters is determined at the
transmitter
[IEV 721-09-01]
2.16
message format
description of the elements and their arrangement in a message
NOTE – The arrangements may include among other items, synchronization bits, address bits, text, flag bits and
additional bits for error correction and/or detection:
a) synchronization bits: additional bits which are provided only for the purpose of synchronization;

– 10 – 60489-6 © IEC:1999(E)
b) address: information that identifies the address or identifies the sending unit;
c) function: information that identifies which of a plurality of responses is to be executed;
d) text: information (e.g. character string);
e) error control bits: bits which are provided solely for the purpose of error correction and/or detection.
2.17
modulation
NOTE – The detailed description of the modulation should be given in specifications of equipment under test.
2.17.1
analogue modulation
2.17.1.1
amplitude modulation:
– peak envelope amplitude: the amplitude of one radio-frequency oscillation at the crest of the
envelope of the modulated wave;
– modulation depth: for double-sideband amplitude modulation, the modulation depth, in per
cent, is given by the following:
VV−
()
max min
= × 100 %
modulation depth
VV+
()
max min
where
V is the peak-to-peak voltage at the crest of modulation;
max
V is the peak-to-peak voltage at the valley of modulation
min
2.17.1.2
frequency or phase modulation
– maximum permissible deviation: the value to which the peak frequency or phase deviation is
limited by an agreed convention for a particular class of service;
– deviation: the variation of the carrier wave in frequency or phase, expressed in per cent of
the maximum permissible deviation
2.17.2
digital modulation
2.17.2.1
keying method
for example,
– frequency-shift keying (FSK)
– phase-shift keying (PSK)
– minimum-shift keying (MSK)
2.17.2.2
roll-off factor and its transmitter percentage
– roll-off factor is expressed by the product of the pulse-shaping function baseband filter cut-
off frequency and the modulation symbol time
– transmitter percentage is the ratio percentage of the roll-off factor, which is performed by
transmitters, the residual percentage being performed by receivers
2.18
port
place of access to a device or network where energy, representing data, may be supplied or
withdrawn, or where the device or network variable may be observed or measured

60489-6 © IEC:1999(E) – 11 –
2.19
radio pager
small radio receiver-decoder which produces an alarm following reception of a selective call;
intended to be worn on a person and usually has an integral antenna
2.20
reference error ratio
the following reference error ratios apply for an equipment measured with the standard test
signal code (data):
– reference error ratio (bit stream or character string) 0,01 or 1 %;
– reference error ratio (message or selective calling) 0,2 or 20 %.
For selective calling (1 – reference error ratio) = 0,8 or 80 % is also called “standard calling
probability”
2.21
selective-calling system
system whereby the transmission of a signal code from a station enables another
predetermined station or group of stations to be called exclusively; it may be used as “selective
calling” or “selective call”
2.22
standard baseband test signals
for the purpose of the measurements described in this standard the following definitions apply:
a) reference sequence of bits
binary sequence pattern of 511 bits which are generated in a pseudo-random order
NOTE – For details concerning the generation of the pseudo-random binary sequence (PRBS) pattern, see CCITT
Fascicle VIII.1, Recommendation O.153.
b) reference sequence of characters
character sequence pattern comprising all elements of a specified character set arranged in a
specified pseudo-random order
c) reference message or selective call
message or selective call whose content is defined in the equipment specification
NOTE – This unique message is repeated three or four times in the “up and down” method.
2.23
standard coded test signal (data): SCTS (data)
radio-frequency signal applied to a data receiver-decoder that simulates the output of a
transmitter which is modulated by one of the following standard baseband test signals:
– the reference sequence of bits; or
– the reference sequence of characters, or
– the reference message or the selective call
– at the bit rate defined in the data equipment specification
All parameter tolerances (e.g. rise time, tone frequencies, phase-shift angles) should be small
enough to ensure that the results are not significantly influenced. In addition to any other
parameters, the equipment specification should define the appropriate values for
– the modulation depth of double-sideband modulation, or
– the frequency/phase deviation of angle modulation, or
– the amplitude relationship to the carrier of single-sideband, full, reduced or variable carrier
modulation,
– the frequency relationship to the carrier of single-sideband, full, reduced or variable carrier
modulation
– 12 – 60489-6 © IEC:1999(E)
2.24
standard train of standard coded test signal (bit stream or character string)
NOTE 1 – The length of the standard trains has been chosen in order to achieve a dispersion of ±1 dB for the
measurement of reference sensitivity and of ±2 dB for all other measurements.
For all measurements and compliance tests, except sensitivity reduction under multipath
propagation conditions (bit stream or character string), the standard trains are
– for bit stream : 2 556 bits of SCTS;
– for character string : 2 556 characters of SCTS
NOTE 2 – For the measurements in this standard, the required reliability is obtained if the transmission is stopped
after 26 bit or character errors are detected.
2.25
standard unwanted signal (data)
the standard unwanted signal for measuring spurious response immunity and intermodulation
immunity is not modulated.
The standard unwanted signal for measuring adjacent radio-frequency signal selectivity or
co-channel interference rejection is continuously modulated with a binary sequence pattern of
32 767 bits which is generated in a pseudo-random order. The modulation is identical with the
modulation characteristics of the system transmitter
2.26
telegraphy
form of telecommunication in which the transmitted information is intended to be recorded on
arrival as a graphic document; the transmitted information may sometimes be presented in an
alternative form or may be stored for subsequent use
NOTE 1 – A graphic document records information in a permanent form and is capable of being filed and consulted;
for example, it may take the form of written or printed matter or of a fixed image.
NOTE 2 – This is the definition given in the International Telecommunication Convention (Nairobi, 1982).
NOTE 3 – Telegraphy does not include television or videography.
[IEV 721-01-06, modified]
3 Test conditions
3.1 Standard test conditions
3.1.1 Unless otherwise stated, measurements shall be performed under the general test
conditions as stated in IEC 60489-1 and the supplementary test conditions given in 3.2.
3.1.2 In this standard, the methods of measurement have been developed under the
assumption that automatic test equipment is available.
3.1.3 If the data source and encoder are external to the transmitter but are dedicated to its
application, the manufacturer shall supply to the organization making the measurements either
detailed information so that the items can be fabricated, or the device itself.
3.2 Supplementary test conditions
3.2.1 Receivers
3.2.1.1 Receiver-decoder having an integral antenna
In this standard, the methods of measurement and compliance tests have been written for
receivers having antenna terminals. For receivers with integral antennas, the following test
conditions apply:
60489-6 © IEC:1999(E) – 13 –
– for average radiation sensitivity (data) (see 11.1.6), measurements and compliance tests
are made on a test site;
– measurements and compliance tests in 4.1 through 4.9 (data) for receiver-decoders having
an integral antenna are made with the receiver in a suitable radio-frequency coupling
device (RFCD).
The RFCD may be
– a test fixture device for coupling a given equipment with an integral antenna to an input
socket. It is generally designed and provided by the manufacturer. It allows relative
measurements to be performed at the same frequency or around the same frequency.
Therefore the measurements and compliance tests in 4.5 (spurious response immunity)
and in 6.1 (radiated spurious components) are excluded;
– a stripline arrangement as described in IEC 60489-1, annex A, clause A.3. This is a
measuring instrument for coupling any equipment with integrated antenna to an input
socket. It allows relative measurement of signals to be performed situated at different
frequencies.
The same procedures are used as for receivers having antenna terminals, except that the
input-signal level recorded is that introduced at the input terminals of the RFCD instead of at
the antenna terminals of the receiver.
NOTE 1 – For message or selective calling, the measurements and compliance tests (4.1 through 4.9) have been
designed for non-automatic use: the number of trials in these measurements and compliance tests have been
reduced to the minimum required to obtain the necessary accuracy and variation. Various automatic measurement
procedures may be used, but it is not proposed that they be standardized at this time. On the other hand, for bit
stream and character string, the measurements and compliance tests (4.1 through 4.9 ) have been designed to use
automatic error counting equipment.
NOTE 2 – The measurements in 4.1 through 4.9 (message or selective calling) can be used for continuous signal
(e.g. continuous tone controlled squelch systems) provided that a time for the operation of the decoder is specified
(e.g. 300 ms).
3.2.1.2 Input-signal arrangements for testing receivers
equipped with suitable antenna terminals
Depending on the type of modulation and the measuring equipment available, one of the three
measuring arrangements described below shall be employed.
a) Arrangement A
The arrangement comprises the following pieces of equipment:
– a test data source and an encoder as required, or a test encoder combining these two
functions;
– a radio-frequency signal generator or an alternate signal source (see 3.3.9) capable of
being modulated in accordance with the type of modulation used by the receiver;
– an impedance matching network (or pad; see (3) of figure 2) placed as close as
possible to the receiver under test.
NOTE – Examples of impedance matching networks and combining networks are given in annex A.
b) Arrangement B
For some types of single-sideband modulation, with corresponding characteristics as given
in 1.2 b) (1), it may be possible to simulate the modulated signal by using two radio-
frequency generators. In this case, an arrangement similar to arrangement A may be used,
but with the signal generator or alternate signal source replaced by two radio-frequency
signal generators, the outputs of which are connected to a combining network terminated in
an adjustable attenuator.
c) Arrangement C
The arrangement is similar to arrangement A, except that it also requires a means to
convert the output frequency of the alternate signal source to the nominal frequency
specified for the receiver. This is accomplished by using a radio-frequency signal generator

– 14 – 60489-6 © IEC:1999(E)
and a frequency converter which is terminated in an adjustable attenuator. Some
measurements require an unwanted signal to be added. This signal is supplied by a
radio-frequency signal generator connected to one of the inputs of a combining network
which is inserted at a convenient place in the transmission line (2) shown in figure 2.
The presentation of results shall state which of the arrangements A, B or C has been used.
For arrangements A and C, the performance of the alternate signal source should be such that
the receiver parameters may be measured up to values which are at least 10 dB greater than
the receivers specified values.
3.2.1.2.1 Source impedance of the measuring arrangement for receivers requiring a
specified source resistance
This subclause applies to receivers which are connected to the antenna by means of a
transmission line (which is synonymous with “feeder line”) having a specified characteristic
impedance, for example equal to R , R being the specified nominal radio-frequency input
n n
impedance of the receiver.
The source impedance R of the measuring arrangement shown in figure 2 shall be equal to
s
the specified source resistance, or, in the absence of such specification, to the specified
nominal radio-frequency input impedance R of the receiver.
n
The nominal radio-frequency input impedance is that value stated by the manufacturer for
which the equipment performance will be optimum when connected to an antenna or
transmission line of the same impedance.
3.2.1.2.2 Input-signal source for receivers tested with the aid of an artificial antenna
This subclause is applicable to receivers intended to operate with an antenna having a complex
impedance.
The input-signal source shall consist of a radio-frequency signal generator, a transmission line,
an impedance matching network, and an artificial antenna. The characteristics of the artificial
antenna shall be specified by the manufacturer of the receiver.
3.2.1.2.3 Receivers tested with the aid of an artificial antenna
The input-signal level is the e.m.f. of the source connected to the input terminals of an artificial
antenna. It should be expressed in μV or dB(μV).
3.2.1.3 Input-signal measuring convention
3.2.1.3.1 Receiver requiring a specified source resistance
The input-signal level should preferably be determined by measuring the electromotive force
present at the output terminals of the unterminated input-signal source (e.m.f. of figure 2).
Alternatively, the input-signal level may be determined by measuring the matched-load (ml)
voltage across a resistance having a value equal to R .
s
The matched-load (ml) voltage is one-half the value of the e.m.f.
When the input-signal level is determined with a voltmeter incorporated in the equipment
supplying the input signal (voltage e in figure 2), the loss of the impedance matching network
g
and, if applicable, also the losses of the transmission line and any combining network and
adjustable attenuators inserted in the transmission line shall be taken into account.

60489-6 © IEC:1999(E) – 15 –
The presentation of results shall state which voltage has been recorded, for example, 2 μV
(e.m.f.) or 1 μV (ml). The source resistance R , shall be stated with the results.
s
3.2.1.3.2 Input-signal level
In this standard, the input-signal levels of the wanted and unwanted signals shall be expressed
in terms of r.m.s. values as follows:
– for angle (type G or F: phase or frequency) modulation, including frequency-shift and
phase-shift modulation or keying: the r.m.s. voltage of the signal, either modulated or
unmodulated;
– for on-off modulation, or keying of a sinusoidal carrier which may or may not be modulated
with an additional signal: the r.m.s. voltage of the continuous carrier, without modulation;
– for double-sideband amplitude (type A) modulation with full carrier: the r.m.s. voltage of the
unmodulated carrier;
– for single-sideband amplitude (type H or R) modulation with full, reduced or variable carrier:
the r.m.s. value of a sinusoidal voltage, the peak value of which is equal to the amplitude of
one radio-frequency cycle at the crest of the envelope of the modulated wave.
The input-signal levels may be expressed in μV or dB(μV) and shall be determined in
accordance with 3.2.1.2.
3.2.1.4 Connections of the measuring equipment
The data measuring equipment shall be connected to the port that provides signals for the
intended application.
Care should be taken that the input impedance of the measuring equipment does not affect the
loading conditions specified for the receiver.
3.2.1.5 Standard input signal
3.2.1.5.1 Standard input signal (type A, G or F modulation)
A radio-frequency signal at standard input-signal level with standard modulation, at the
standard input-signal frequency.
3.2.1.5.2 Standard input signal (type H or R modulation)
A radio-frequency signal or linear combination of two radio-frequency signals from a signal
source that simulates the single-sideband emission from a transmitter when it is modulated
with an audio-frequency signal of 1 000 Hz.
The frequencies and the levels of the input signal are dependent upon the class of emission
they represent. Two frequencies, one of which represents the carrier and the other the
sideband, are chosen so that when demodulated they will produce an audio output at a
frequency of 1 000 Hz.
The standard input-signal levels are
Class of emission Signal representing carrier Signal representing sideband
dB(μV) dB(μV)
R3E +42 +60
H3E +54 +54
– 16 – 60489-6 © IEC:1999(E)
3.2.1.6 Standard input-signal level
Unless otherwise specified, the standard input-signal level for a receiver of the type considered
in this standard is 60 dB(μV) (e.m.f.) or 54 dB(μV) (ml).
3.2.1.7 Standard input-signal frequency
For all tests, except where otherwise specified, the standard input-signal frequency is one of
the specified nominal frequencies. For SSB type of modulation, the nominal frequency is the
frequency of the carrier.
3.2.1.8 Standard modulation of an input signal
a) for digital modulation
The standard modulation is the nominal m
...