IEC 60489-3:1988/AMD1:1999

INTERNATIONAL
IEC
STANDARD
60489-3
AMENDMENT 1
1999-04
Amendment 1
Methods of measurement for radio equipment
used in the mobile services –
Part 3:
Receivers employing A3E, F3E
or G3E emissions
Amendement 1
Méthodes de mesure applicables au matériel
de radiocommunication utilisé dans les services mobiles –
Partie 3:
Récepteurs conçus pour les émissions A3E, F3E ou G3E
 IEC 1999  Copyright - all rights reserved
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– 2 – 60489-3 Amend.1  IEC:1999(E)
FOREWORD
This amendment has been prepared by IEC technical committee 102: Equipment used in radio
communications for mobile services and for satellite communication systems.
The text of this amendment is based on the following documents:
FDIS Report on voting
102/42/FDIS 102/50/RVD
Full information on the voting for the approval of this amendment can be found in the report on
voting indicated in the above table.
A bilingual version of this amendment may be published at a later date.
–––––––––––
Amend the title of this standard on the cover page, the title page and on pages, 7 and 11 as
follows:
METHODS OF MEASUREMENT FOR RADIO EQUIPMENT USED
IN THE MOBILE SERVICES –
Part 3: Receivers employing A3E, F3E or G3E emissions
Page 3
CONTENTS
Replace the title of clause 7 by the following:
7 Sensitivity. .
Insert after clause 14, the title of the following new clause 15:
15 Expander characteristics. .
Re-number the existing clauses 15 to 21 as clauses 16 to 22, respectively.
Delete the title of the current clause 22.
Replace the title of the current clause 23 by the title of new clause 23:
23 Receiver output power . .
Re-number clause 24 as clause 25.
Delete the title of clause 25.
Add the title of the following new clause 36:
36 Impulsive-noise tolerance (integral antenna) .

60489-3 Amend. 1  IEC:1999(E) – 3 –
Page 3
Delete the appendices F to L inclusive.
Add the following new annexes:
Annex M – Rayleigh fading simulators.
Annex N – Accuracy for diversity receiver sensitivity measurement .
Page 7
PREFACE
Add, on page 9, after 489-1 (1983), the following:
Amendment 1 (1986)
1)
Amendment 2
Insert, before 489-6 (1987) the following:
IEC 60489-2 (1991): Part 2: Transmitters employing A3E, F3E and G3E emissions
1)
Amendment 1
Add the following footnote, referring to both amendment 2 of IEC 60489-1 and amendment 1 of
IEC 60489-2:
Add, under 489-6 (1987) the following:
ITU-T Recommendation O.41(19/94): Psophometer for use on telephone-type circuits.
Page 11
SECTION ONE – GENERAL
1 Scope
Replace the text of this clause by the following:
This standard refers specifically to mobile radio receivers having audio-frequency bandwidths
generally not exceeding 10 kHz for the reception of voice and other types of signals, using:
a) angle modulation (frequency modulation (F3E)/phase modulation (G3E)), or
b) double-sideband amplitude modulation with full carrier (A3E).
This standard is intended to be used in conjunction with IEC 60489-1. The supplementary
terms and definitions and the conditions of measurement set forth in this standard are intended
for type tests and may also be used for acceptance tests.
––––––––
1)
To be published.
– 4 – 60489-3 Amend.1  IEC:1999(E)
Page 21
5.10.1 Limitation of the audio-frequency band
Replace the text of this subclause by the following:
Because some properties, for example noise and audio-frequency harmonic distortion, depend
upon the audio-frequency bandwidth, reproducible results can be obtained only when the band
of audio-frequencies occupied by the demodulated signal is restricted to specified limits.
This restriction may be accomplished by means of a band-limiting filter preceding any audio-
frequency measuring device and adapted to the type of signals to be transmitted. The filter may
be incorporated within the measuring equipment. When measuring residual hum and noise,
only the low-pass portion of the filter should be specified.
In the case of speech transmission, the filter shall be in accordance with the psophometric filter
described in ITU-T Recommendation O.41 (see table 1).
Table 1 – Characteristics of the psophometric filter
Frequency Relative weighting Limit
Hz dB dB
16,66 –85,0 –
–63,0 2
100 –41,0 2
200 –21,0 2
300 –10,6 1
400 –6,3
500 –3,6 1
600 –2,0 1
700 –0,9 1
800  0
0 (reference)
900 +0,6 1
1 000 +1,0 1
1 200  0 1
1 400 –0,9
1 600 –1,7 1
1 800 –2,4 1
2 000 –3,0 1
2 500 –4,2
3 000 –5,6 1
3 500 –8,5 2
4 000 –15,0 3
4 500 –25,0 3
5 000 –36,0 3
6 000 –43,0 –
60489-3 Amend. 1  IEC:1999(E) – 5 –
Page 23
6.4 Radio-frequency coupling device (RFCD)
Replace the text of this subclause by the following:
The measurements described in this standard are applicable to receivers having either antenna
terminals or an integral antenna.
Measurements of the radio-frequency parameter of receivers having an integral antenna are
performed in a test site or in an RFCD. See IEC 60489-1, annex A, for details of these.
Page 25
SECTION THREE – METHOD OF MEASUREMENT FOR RECEIVERS EQUIPPED
WITH SUITABLE ANTENNA TERMINALS
Replace the title and text of clause 7 by the following:
7 Sensitivity
7.1 Measured usable sensitivity (MUS)
7.1.1 Definition
Level of the input signal at a specified frequency with specified modulation which will result in
the standard signal-to-noise ratio (see 3.3) at the output of the receiver.
7.1.2 Method of measurement
a) Connect the equipment as illustrated in figure 3.
b) Apply the standard input signal to the receiver input terminals.
c) Adjust the receiver volume control to obtain the reference output level (see 3.1.2). Record
this level.
d) Adjust the input-signal level to produce the standard signal-to-noise ratio. Record this level.
e) If the audio output level obtained in d) is more than 3 dB below the level recorded in step
c), this fact should be recorded. The input-signal level at which the audio output level has
fallen by 3 dB should be recorded.
f) The measured usable sensitivity is the level recorded in step d). It is expressed as follows:
SND++
the measured usable sensitivity for a ratio of 12 dB is_____μV or dB (μV).
ND+
7.2 Specified usable sensitivity (SUS)
7.2.1 Definition
Level of the input signal specified by the regulatory authority, manufacturer or customer at the
specified input-signal frequency (see 5.5) with standard modulation (see 5.6) which results in a
signal-to-noise ratio, equal to or greater than the standard signal-to-noise ratio.
NOTE – To make meaningful measurements, the specified input-signal level should be chosen taking into account
the dispersion of the sensitivities of various equipment in defined environmental conditions.

– 6 – 60489-3 Amend.1  IEC:1999(E)
Page 27
8 Acceptable radio-frequency displacement
Replace the text of this clause by the following:
8.1 Definition
Change of input-signal frequency that is required to restore the standard signal-to-noise ratio
after an increase of the input-signal level by 6 dB from the sensitivity (SUS or MUS). The
acceptable radio-frequency displacement is then the smaller of the two possible radio-
frequency displacements.
NOTE – Radio-frequency displacement is an absolute value and an increase in the displacement is to move the
radio-frequency away from the nominal frequency.
8.2 Method of measurement
a) Connect the equipment as illustrated in figure 3.
b) Apply the standard input signal to the receiver input terminals.
c) Adjust the receiver gain control to obtain the reference output level (see 3.1.2). Record this
level.
d) Adjust the input-signal level to produce the standard signal-to-noise ratio or the sensitivity
(SUS). Record this level.
e) Increase the input signal level in step d) by 6 dB and then increase the input signal
frequency until the standard signal-to-noise ratio is again obtained. Record this frequency.
f) Repeat step e) for input signal frequencies below the standard input-signal frequency.
8.3 Presentation of results
a) Calculate and record the differences between the standard input-signal frequency of the
receiver and each of the frequencies recorded in steps e) and f), respectively.
b) The acceptable radio-frequency displacement (SUS or MUS) is the smaller of the two
values in step a).
c) Record the standard input-signal frequency.
Page 29
10.3 Presentation of results
Replace the existing subclause by the following:
Plot the values recorded in step e), in decibels relative to the level at 1 kHz, on the linear
ordinate of a graph, and the modulating frequency on the logarithmic abscissa.
Calculate the audio-frequency response deviations from reference audio-frequency response,
in decibels, taking the deviation at 1 000 Hz equal to 0 dB. The deviation from the reference
audio-frequency response, having de-emphasis of –6 dB/octave, shall be calculated according
to the data listed in the table below, unless otherwise specified in the equipment specification.
Modulation frequency 300 500 1 000 2 000 3 000 3 400
Hz
Reference value +10,5 +6,0 0 –6,0 –9,5 –10,6
dB
If de-emphasis is not provided in the receiver, flat audio-frequency response is considered as
reference one in the specified audio-frequency bandwidth.

60489-3 Amend. 1  IEC:1999(E) – 7 –
Page 35
Figure 5
Replace, in figure 5, "Reference Sensitivity" with "Sensitivity (SUS or MUS)".
Page 41
Insert the following new clause before the current clause 15:
15 Expander characteristics
This measurement is applicable to receivers intended for the reception of angle-modulated
signals.
15.1 Expander overall amplitude characteristics
15.1.1 Definition
Relationship between the deviation of the received carrier, at one frequency, and the audio
level or the receiver output.
15.1.2 Method of measurement
a) Connect a radio-frequency signal source to the input of the receiver.
b) Modulate the radio-frequency signal source with an audio-frequency tone of 1 kHz to obtain
25 % of the maximum permissible frequency (or phase) deviation.
c) Measure the audio level at the receiver output. This is the reference level.
d) Change the frequency deviation which is specified by users and manufacturers, and
measure the audio level at the receiver output.
e) Calculate the relative level at the receiver output, using the reference value obtained in step
c), for each frequency deviation measured in step d).
15.2 Expander attack and recovery time
15.2.1 Definitions
Expander attack time is the time between the instant when a step increase of carrier frequency
deviation is applied and the instant when the audio level at the receiver output rises to a value
equal to 0,75 times the new steady-state value.
Expander recovery time is the time between the instant when a step decrease of the carrier
frequency deviation is applied and the instant when the audio level at the receiver output falls
to a value equal to 1,5 times the new steady-state value.
15.2.2 Method of measurement
a) Connect a radio-frequency signal source to the input of the receiver.
b) Modulate the radio-frequency signal source with an audio tone frequency of 2 kHz to obtain
25 % of the maximum permissible frequency (or phase) deviation.
c) Measure the audio level at the receiver output.
d) Change the deviation of the radio-frequency signal source to 50 % of the maximum
permissible frequency (or phase) deviation.
e) Measure the level at receiver output. Note the result.

– 8 – 60489-3 Amend.1  IEC:1999(E)
f) Switch the deviation from 50 % to 25 % within 100 μs and measure the time for the audio
level of the speaker input to fall to 1,5 times the value recorded in step c). Record this time
as the recovery time.
g) Switch the deviation from 25 % to 50 % within 100 μs and measure the time taken for the
audio level at the receiver output to rise 0,75 times of the value recorded in step e). Record
this time as the attack time.
Page 41
15 Impulsive noise
Renumber this clause as clause 16.
15.2.1 Definition
Replace the text of this subclause by the following. The subclause number becomes 16.2.1.
Ability of a receiver to prevent impulsive noise from degrading the desired response at the
output of the receiver.
It is expressed as the ratio of
a) the median level of spectrum amplitude of the impulsive noise that causes a wanted signal,
which is 3 dB in excess of the sensitivity (SUS or MUS), to restore the standard signal-to-
noise ratio at the receiver output terminals
to
b) the wanted signal level (sensitivity (SUS) plus 3 dB) or the sensitivity (MUS) (the wanted
signal level is the sensitivity (MUS) plus 3 dB).
Page 43
15.2.2 Method of measurement
Replace, in this subclause, the number of which becomes 16.2.2 according to the new
numbering, Note 1 by the following:
NOTE 1 – The value of the sensitivity (SUS or MUS) determined in 7.1.2 or defined in 7.2.1 is required for this
measurement.
Replace c) of 15.2.2 by the following:
c) In the absence of the impulsive noise, apply the standard input signal to terminal A and B of
the combining network (see 5.3). Reduce its level to obtain the sensitivity (SUS or MUS) at
the input of the receiver.
15.2.3 Presentation of result
In the new 16.2.3, replace twice "reference sensitivity" with "sensitivity (SUS or MUS)".

60489-3 Amend. 1  IEC:1999(E) – 9 –
Page 45
16 Selectivity
Replace the text of this clause by the following. The new clause number becomes 17.
17.1 General
Selectivity is the ability of the receiver to discriminate between wanted and unwanted input
signals.
The methods of measurement described in this clause deal only with interference that
degrades the receiver output signal due to the simultaneous presence of a wanted and an
unwanted input-signal. It is to be noted, however, that unwanted signals may also be
objectionable when the wanted signal is not present
...