SIST ETS 300 676 E1:2003

Radio Equipment and Systems (RES); Radio transmitters and receivers at aeronautical stations of the aeronautical mobile service operating in the VHF band (118 MHz -137 MHz) using amplitude modulation and 8,33 kHz channel spacing; Technical characteristics and methods of measurement

International standard for ground based radio equipment used in aeronautical VHF communication systems employing double sideband amplitude modulation and 8,33 kHz channel spacing. The civil aeronautical authorities wish to apply this standard in the European air space.

Radijska oprema in sistemi (RES) – Radijski oddajniki in sprejemniki v aeronavtičnih postajah aeronavtične mobilne storitve, ki delujejo v pasu VHF (118 MHz–137 MHz) z uporabo amplitudne modulacije in s kanalskim razmikom 8,33 MHz – Tehnične karakteristike in merilne metode

General Information

• Status: Published
• Publication Date: 30-Nov-2003
• Withdrawal Date: 30-Sep-2003
• ICS: 33.060.20 - Receiving and transmitting equipment
• ICS: 49.090 - On-board equipment and instruments
• 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 300 676 ed.1 (1997-03) - Radio Equipment and Systems (RES); Radio transmitters and receivers at aeronautical stations of the aeronautical mobile service operating in the VHF band (118 MHz -137 MHz) using amplitude modulation and 8,33 kHz channel spacing; Technical characteristics and methods of measurement

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 676 E1:2003
01-december-2003
5DGLMVNDRSUHPDLQVLVWHPL5(6±5DGLMVNLRGGDMQLNLLQVSUHMHPQLNLY
DHURQDYWLþQLKSRVWDMDKDHURQDYWLþQHPRELOQHVWRULWYHNLGHOXMHMRYSDVX9+)
0+]±0+]]XSRUDERDPSOLWXGQHPRGXODFLMHLQVNDQDOVNLPUD]PLNRP
0+]±7HKQLþQHNDUDNWHULVWLNHLQPHULOQHPHWRGH
Radio Equipment and Systems (RES); Radio transmitters and receivers at aeronautical
stations of the aeronautical mobile service operating in the VHF band (118 MHz -137
MHz) using amplitude modulation and 8,33 kHz channel spacing; Technical
characteristics and methods of measurement
Ta slovenski standard je istoveten z: ETS 300 676 Edition 1
ICS:
33.060.20 Sprejemna in oddajna Receiving and transmitting
oprema equipment
49.090 2SUHPDLQLQVWUXPHQWLY On-board equipment and
]UDþQLKLQYHVROMVNLKSORYLOLK instruments
SIST ETS 300 676 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 676 E1:2003

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SIST ETS 300 676 E1:2003
EUROPEAN ETS 300 676
TELECOMMUNICATION March 1997
STANDARD
Source: ETSI TC-RES Reference: DE/RES-00007
ICS: 33.020
Key words: Aeronautical, AM, DSB, radio, testing
Radio Equipment and Systems (RES);
Radio transmitters and receivers at aeronautical stations
of the aeronautical mobile service
operating in the VHF band (118 MHz - 137 MHz)
using amplitude modulation and 8,33 kHz channel spacing;
Technical characteristics and methods of measurement
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 1997. All rights reserved.

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SIST ETS 300 676 E1:2003
Page 2
ETS 300 676: March 1997
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.

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SIST ETS 300 676 E1:2003
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ETS 300 676: March 1997
Contents
Foreword .7
Introduction.7
1 Scope .9
2 Normative references.9
3 Definitions, abbreviations and symbols.9
3.1 Definitions .9
3.2 Abbreviations .10
4 General requirements .10
4.1 Construction.10
4.2 Controls and indicators .10
4.3 Safety precautions .11
4.4 Class of emission and modulation characteristics.11
4.5 Warm up .11
5 Test conditions, power sources and ambient temperatures .11
5.1 Normal and extreme test conditions .11
5.2 Test power source .11
5.3 Normal test conditions .11
5.3.1 Normal temperature and humidity.11
5.3.2 Normal power sources .12
5.3.2.1 Mains voltage and frequency.12
5.3.2.2 Battery power sources.12
5.3.2.3 Other power sources .12
5.4 Extreme test conditions .12
5.4.1 Extreme temperatures.12
5.4.2 Extreme values of test power sources .12
5.4.2.1 Mains voltage.12
5.4.2.2 Battery power sources.12
5.4.2.3 Other power sources .12
5.5 Procedure for tests at extreme temperatures.12
5.6 Environmental tests .12
5.6.1 General.12
5.6.2 Performance check .13
5.6.3 Temperature tests .13
5.6.3.1 Dry heat .13
5.6.3.2 Damp heat .13
5.6.3.3 Low temperature.14
6 General conditions of measurement .14
6.1 Receiver test signal arrangement .14
6.1.1 Test signal sources .14
6.1.2 Level.14
6.1.3 Nominal frequency .14
6.1.4 Normal test signal.14
6.1.5 Squelch .14
6.1.6 Normal audio output power .14
6.2 Transmitter test signal arrangement.14
6.2.1 Artificial antenna.14
6.2.2 Signal sources.15
6.2.3 Normal test signal.15
6.3 Test channels .15

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ETS 300 676: March 1997
7 Transmitter . 15
7.1 Frequency error. 15
7.1.1 Definition. 15
7.1.2 Method of measurement. 15
7.1.3 Limits . 15
7.2 Carrier power. 15
7.2.1 Definitions . 15
7.2.2 Method of measurement. 16
7.2.3 Limits . 16
7.2.3.1 Normal test conditions . 16
7.2.3.2 Extreme test conditions. 16
7.3 Amplitude modulation characteristic . 16
7.3.1 Modulation depth . 16
7.3.1.1 Definitions . 16
7.3.1.2 Method of measurement. 17
7.3.1.3 Limits. 17
7.3.2 Modulation compression. 17
7.3.2.1 Definition . 17
7.3.2.2 Method of measurement. 17
7.3.2.3 Limits. 17
7.3.3 Amplitude modulation distortion. 18
7.3.3.1 Definition . 18
7.3.3.2 Method of measurement. 18
7.3.3.3 Limits. 18
7.3.4 Audio frequency response . 18
7.3.4.1 Definition . 18
7.3.4.2 Method of measurement. 18
7.3.4.3 Limits. 18
7.3.5 Unwanted frequency modulation . 18
7.3.5.1 Definition . 18
7.3.5.2 Method of measurement. 18
7.3.5.3 Limits. 18
7.4 Adjacent channel power. 19
7.4.1 Definition. 19
7.4.2 Measurement. 19
7.4.3 Limits . 19
7.5 Conducted spurious emissions . 19
7.5.1 Definition. 19
7.5.2 Method of measurement. 20
7.5.3 Limits . 20
7.6 Cabinet radiation . 20
7.6.1 Definition. 20
7.6.2 Method of measurement. 20
7.6.3 Limits . 21
7.7 Intermodulation attenuation. 21
7.7.1 Definition. 21
7.7.2 Method of measurement. 22
7.7.3 Limits . 22
7.8 RF power attack time and release time. 23
7.8.1 Definitions . 23
7.8.2 Method of measurement. 23
7.8.2.1 Attack time . 23
7.8.2.2 Release time . 23
7.8.3 Limits . 24
7.9 Transient frequency behaviour of the transmitter. 24
7.9.1 Definitions . 24
7.9.2 Method of measurement. 24
7.9.3 Limits . 28
7.10 Protection of the transmitter. 28
7.10.1 Definition. 28
7.10.2 Method of measurement. 28
7.10.3 Requirement . 28

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ETS 300 676: March 1997
8 Receiver .28
8.1 Maximum usable sensitivity .28
8.1.1 Definition .28
8.1.2 Method of measurement .28
8.1.3 Limits.29
8.2 Harmonic distortion.29
8.2.1 Definition .29
8.2.2 Method of measurement .29
8.2.3 Limits.29
8.3 Audio frequency response .29
8.3.1 Definition .29
8.3.2 Method of measurement .29
8.3.3 Limits.29
8.4 Audio noise .30
8.4.1 Definition .30
8.4.2 Method of measurement .30
8.4.3 Limits.30
8.5 Adjacent channel selectivity.30
8.5.1 Definition .30
8.5.2 Method of measurement .30
8.5.3 Limits.31
8.6 Spurious response rejection .31
8.6.1 Definition .31
8.6.2 Introduction to the method of measurement .31
8.6.3 Method of search of the limited frequency range .32
8.6.4 Method of measurement .32
8.6.5 Limit.32
8.7 Intermodulation response rejection.32
8.7.1 Definition .32
8.7.2 Method of measurement .32
8.7.3 Limit.33
8.8 Blocking or desensitisation .33
8.8.1 Definition .33
8.8.2 Method of measurement .33
8.8.3 Limit.33
8.9 Conducted spurious emissions.34
8.9.1 Definition .34
8.9.2 Method of measuring the power level .34
8.9.3 Limits.34
8.10 Radiated spurious emissions.34
8.10.1 Definition .34
8.10.2 Method of measuring the effective radiated power .34
8.10.3 Limits.35
8.11 Squelch operation.35
8.11.1 Definition .35
8.11.2 Method of measurement .35
8.11.3 Limits.36
8.12 Cross modulation rejection .36
8.12.1 Definition .36
8.12.2 Method of measurement .36
8.12.3 Limits.36
8.13 RF automatic gain control.36
8.13.1 Definition .36
8.13.2 Method of measurement .37
8.13.3 Limit.37
9 Measurement uncertainty and interpretation of the measured results.37
9.1 Maximum measurement uncertainties.37
9.2 Interpretation of the measurement results.38
Annex A (normative): Radiated measurements .39
A.1 Test sites and general arrangements for measurements involving the use of radiated fields .39

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ETS 300 676: March 1997
A.1.1 Outdoor test site. 39
A.1.2 Test antenna . 39
A.1.3 Substitution antenna. 40
A.1.4 Optional additional indoor site . 40
A.2 Guidance on the use of radiation test sites . 41
A.2.1 Measuring distance . 41
A.2.2 Test antenna . 41
A.2.3 Substitution antenna. 41
A.2.4 Artificial antenna. 41
A.2.5 Auxiliary cables . 42
A.2.6 Acoustic measuring arrangement . 42
A.3 Further optional alternative indoor test site using an anechoic chamber . 42
A.3.1 Example of the construction of a shielded anechoic chamber. 42
A.3.2 Influence of parasitic reflections in anechoic chambers. 43
A.3.3 Calibration of the shielded anechoic chamber . 44
Annex B (normative): Specification for adjacent channel power measurement arrangements. 46
B.1 Power measuring receiver specification . 46
B.1.1 IF filter . 46
B.1.2 Attenuation indicator. 47
B.1.3 RMS value indicator . 47
B.1.4 Oscillator and amplifier. 47
History. 48

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Page 7
ETS 300 676: March 1997
Foreword
This European Telecommunication Standard (ETS) has been produced by the Radio Equipment and
Systems (RES) Technical Committee of the European Telecommunications Standards Institute (ETSI).
Transposition dates
Date of adoption: 28 February 1997
Date of latest announcement of this ETS (doa): 30 June 1997
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 December 1997
Date of withdrawal of any conflicting National Standard (dow): 31 December 1997
Introduction
This ETS states the minimum performance requirements for radio transmitters and receivers at
aeronautical stations of the aeronautical mobile service operating in the VHF band (118 MHz - 137 MHz),
using Double Sideband Amplitude Modulation with 8,33 kHz channel spacing.
This ETS may be used by accredited test laboratories for the assessment of the performance of the
equipment. The performance of the equipment submitted for type testing should be representative for the
performance of the corresponding production model.
This ETS has been written on the assumption that:
- the type test measurements will be performed only once, in one of the accredited test laboratories
and the measurements accepted by the various authorities in order to grant type approval;
- if equipment available on the market is required to be checked it will be tested in accordance with
the methods of measurement specified in this ETS.

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ETS 300 676: March 1997
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ETS 300 676: March 1997
1 Scope
This European Telecommunication Standard (ETS) states the minimum performance requirements for
radio transmitters and receivers at ground-based aeronautical stations operating in the VHF band
(118 MHz - 137 MHz) allocated to the aeronautical mobile service. The allotment of 8,33 kHz channels in
the VHF band has been decided by the International Civil Aviation Organization (ICAO) and may be found
in ICAO Annex 10 Volume V [3].
This ETS applies only to Double Side Band (DSB) Amplitude Modulation (AM) systems, with channel
separations of 8,33 kHz intended for analogue speech. Offset carrier operation is not intended in a
8,33 kHz channel separation environment. A system can exist of a combination of the single transmitter or
a single receiver or a transceiver. The scope of this ETS is limited to ground base stations, and excludes
ground mobile and handportable stations.
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 references 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] ICAO Annex 10 Volume III Part 2 (1996): "Voice Communication Systems".
[2] ETR 028: "Radio Equipment and Systems (RES); Uncertainties in the
measurement of mobile radio equipment characteristics".
[3] ICAO Annex 10 Volume V (1996): "Aeronautical Radio Frequency Spectrum
Utilization".
[4] ITU-T Recommendation P.53: "Psophometer for use on telephone-type circuits".
3 Definitions, abbreviations and symbols
3.1 Definitions
For the purposes of this ETS, the following definitions apply:
Types of measurements:
conducted measurements: Measurements which are made using a direct RF connec
...

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Radio Equipment and Systems (RES); Radio transmitters and receivers at aeronautical stations of the aeronautical mobile service operating in the VHF band (118 MHz -137 MHz) using amplitude modulation and 8,33 kHz channel spacing; Technical characteristics and methods of measurement49.090On-board equipment and instruments33.100.01Elektromagnetna združljivost na splošnoElectromagnetic compatibility in general33.060.20Sprejemna in oddajna opremaReceiving and transmitting equipmentICS:Ta slovenski standard je istoveten z:ETS 300 676 E13SIST ETS 300 676en01-VHSWHPEHU3SIST ETS 300 676SLOVENSKI
STANDARD



SIST ETS 300 676 E1:2003



EUROPEANETS 300 676TELECOMMUNICATIONMarch 1997STANDARDSource: ETSI TC-RESReference: DE/RES-00007ICS:33.020Key words:Aeronautical, AM, DSB, radio, testingRadio Equipment and Systems (RES);Radio transmitters and receivers at aeronautical stationsof the aeronautical mobile serviceoperating in the VHF band (118 MHz - 137 MHz)using amplitude modulation and 8,33 kHz channel spacing;Technical characteristics and methods of measurementETSIEuropean Telecommunications Standards InstituteETSI SecretariatPostal address: F-06921 Sophia Antipolis CEDEX - FRANCEOffice address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCEX.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [e-mail].: [phone] - Fax: [phone]Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and theforegoing restriction extend to reproduction in all media.© European Telecommunications Standards Institute 1997. All rights reserved.SIST ETS 300 676 E1:2003



Page 2ETS 300 676: March 1997Whilst 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.SIST ETS 300 676 E1:2003



Page 3ETS 300 676: March 1997ContentsForeword.7Introduction.71Scope.92Normative references.93Definitions, abbreviations and symbols.93.1Definitions.93.2Abbreviations.104General requirements.104.1Construction.104.2Controls and indicators.104.3Safety precautions.114.4Class of emission and modulation characteristics.114.5Warm up.115Test conditions, power sources and ambient temperatures.115.1Normal and extreme test conditions.115.2Test power source.115.3Normal test conditions.115.3.1Normal temperature and humidity.115.3.2Normal power sources.125.3.2.1Mains voltage and frequency.125.3.2.2Battery power sources.125.3.2.3Other power sources.125.4Extreme test conditions.125.4.1Extreme temperatures.125.4.2Extreme values of test power sources.125.4.2.1Mains voltage.125.4.2.2Battery power sources.125.4.2.3Other power sources.125.5Procedure for tests at extreme temperatures.125.6Environmental tests.125.6.1General.125.6.2Performance check.135.6.3Temperature tests.135.6.3.1Dry heat.135.6.3.2Damp heat.135.6.3.3Low temperature.146General conditions of measurement.146.1Receiver test signal arrangement.146.1.1Test signal sources.146.1.2Level.146.1.3Nominal frequency.146.1.4Normal test signal.146.1.5Squelch.146.1.6Normal audio output power.146.2Transmitter test signal arrangement.146.2.1Artificial antenna.146.2.2Signal sources.156.2.3Normal test signal.156.3Test channels.15SIST ETS 300 676 E1:2003



Page 4ETS 300 676: March 19977Transmitter.157.1Frequency error.157.1.1Definition.157.1.2Method of measurement.157.1.3Limits.157.2Carrier power.157.2.1Definitions.157.2.2Method of measurement.167.2.3Limits.167.2.3.1Normal test conditions.167.2.3.2Extreme test conditions.167.3Amplitude modulation characteristic.167.3.1Modulation depth.167.3.1.1Definitions.167.3.1.2Method of measurement.177.3.1.3Limits.177.3.2Modulation compression.177.3.2.1Definition.177.3.2.2Method of measurement.177.3.2.3Limits.177.3.3Amplitude modulation distortion.187.3.3.1Definition.187.3.3.2Method of measurement.187.3.3.3Limits.187.3.4Audio frequency response.187.3.4.1Definition.187.3.4.2Method of measurement.187.3.4.3Limits.187.3.5Unwanted frequency modulation.187.3.5.1Definition.187.3.5.2Method of measurement.187.3.5.3Limits.187.4Adjacent channel power.197.4.1Definition.197.4.2Measurement.197.4.3Limits.197.5Conducted spurious emissions.197.5.1Definition.197.5.2Method of measurement.207.5.3Limits.207.6Cabinet radiation.207.6.1Definition.207.6.2Method of measurement.207.6.3Limits.217.7Intermodulation attenuation.217.7.1Definition.217.7.2Method of measurement.227.7.3Limits.227.8RF power attack time and release time.237.8.1Definitions.237.8.2Method of measurement.237.8.2.1Attack time.237.8.2.2Release time.237.8.3Limits.247.9Transient frequency behaviour of the transmitter.247.9.1Definitions.247.9.2Method of measurement.247.9.3Limits.287.10Protection of the transmitter.287.10.1Definition.287.10.2Method of measurement.287.10.3Requirement.28SIST ETS 300 676 E1:2003



Page 5ETS 300 676: March 19978Receiver.288.1Maximum usable sensitivity.288.1.1Definition.288.1.2Method of measurement.288.1.3Limits.298.2Harmonic distortion.298.2.1Definition.298.2.2Method of measurement.298.2.3Limits.298.3Audio frequency response.298.3.1Definition.298.3.2Method of measurement.298.3.3Limits.298.4Audio noise.308.4.1Definition.308.4.2Method of measurement.308.4.3Limits.308.5Adjacent channel selectivity.308.5.1Definition.308.5.2Method of measurement.308.5.3Limits.318.6Spurious response rejection.318.6.1Definition.318.6.2Introduction to the method of measurement.318.6.3Method of search of the limited frequency range.328.6.4Method of measurement.328.6.5Limit.328.7Intermodulation response rejection.328.7.1Definition.328.7.2Method of measurement.328.7.3Limit.338.8Blocking or desensitisation.338.8.1Definition.338.8.2Method of measurement.338.8.3Limit.338.9Conducted spurious emissions.348.9.1Definition.348.9.2Method of measuring the power level.348.9.3Limits.348.10Radiated spurious emissions.348.10.1Definition.348.10.2Method of measuring the effective radiated power.348.10.3Limits.358.11Squelch operation.358.11.1Definition.358.11.2Method of measurement.358.11.3Limits.368.12Cross modulation rejection.368.12.1Definition.368.12.2Method of measurement.368.12.3Limits.368.13RF automatic gain control.368.13.1Definition.368.13.2Method of measurement.378.13.3Limit.379Measurement uncertainty and interpretation of the measured results.379.1Maximum measurement uncertainties.379.2Interpretation of the measurement results.38Annex A (normative):Radiated measurements.39A.1Test sites and general arrangements for measurements involving the use of radiated fields.39SIST ETS 300 676 E1:2003



Page 6ETS 300 676: March 1997A.1.1Outdoor test site.39A.1.2Test antenna.39A.1.3Substitution antenna.40A.1.4Optional additional indoor site.40A.2Guidance on the use of radiation test sites.41A.2.1Measuring distance.41A.2.2Test antenna.41A.2.3Substitution antenna.41A.2.4Artificial antenna.41A.2.5Auxiliary cables.42A.2.6Acoustic measuring arrangement.42A.3Further optional alternative indoor test site using an anechoic chamber.42A.3.1Example of the construction of a shielded anechoic chamber.42A.3.2Influence of parasitic reflections in anechoic chambers.43A.3.3Calibration of the shielded anechoic chamber.44Annex B (normative):Specification for adjacent channel power measurement arrangements.46B.1Power measuring receiver specification.46B.1.1IF filter.46B.1.2Attenuation indicator.47B.1.3RMS value indicator.47B.1.4Oscillator and amplifier.47History.48SIST ETS 300 676 E1:2003



Page 7ETS 300 676: March 1997ForewordThis European Telecommunication Standard (ETS) has been produced by the Radio Equipment andSystems (RES) Technical Committee of the European Telecommunications Standards Institute (ETSI).Transposition datesDate of adoption:28 February 1997Date of latest announcement of this ETS (doa):30 June 1997Date of latest publication of new National Standardor endorsement of this ETS (dop/e):31 December 1997Date of withdrawal of any conflicting National Standard (dow):31 December 1997IntroductionThis ETS states the minimum performance requirements for radio transmitters and receivers ataeronautical stations of the aeronautical mobile service operating in the VHF band (118 MHz - 137 MHz),using Double Sideband Amplitude Modulation with 8,33 kHz channel spacing.This ETS may be used by accredited test laboratories for the assessment of the performance of theequipment. The performance of the equipment submitted for type testing should be representative for theperformance of the corresponding production model.This ETS has been written on the assumption that:-the type test measurements will be performed only once, in one of the accredited test laboratoriesand the measurements accepted by the various authorities in order to grant type approval;-if equipment available on the market is required to be checked it will be tested in accordance withthe methods of measurement specified in this ETS.SIST ETS 300 676 E1:2003



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Page 9ETS 300 676: March 19971ScopeThis European Telecommunication Standard (ETS) states the minimum performance requirements forradio transmitters and receivers at ground-based aeronautical stations operating in the VHF band(118 MHz - 137 MHz) allocated to the aeronautical mobile service. The allotment of 8,33 kHz channels inthe VHF band has been decided by the International Civil Aviation Organization (ICAO) and may be foundin ICAO Annex 10 Volume V [3].This ETS applies only to Double Side Band (DSB) Amplitude Modulation (AM) systems, with channelseparations of 8,33 kHz intended for analogue speech. Offset carrier operation is not intended in a8,33 kHz channel separation environment. A system can exist of a combination of the single transmitter ora single receiver or a transceiver. The scope of this ETS is limited to ground base stations, and excludesground mobile and handportable stations.2Normative referencesThis ETS incorporates by dated or undated reference provisions from other publications. These normativereferences are cited at the appropriate places in the text and the publications are listed hereafter. Fordated references, subsequent references to or revisions of any of these publications apply to this ETSonly when incorporated in it by amendment or revision. For undated references the latest edition of thepublication referred to applies.[1]ICAO Annex 10 Volume III Part 2 (1996): "Voice Communication Systems".[2]ETR 028: "Radio Equipment and Systems (RES); Uncertainties in themeasurement of mobile radio equipment characteristics".[3]ICAO Annex 10 Volume V (1996): "Aeronautical Radio Frequency SpectrumUtilization".[4]ITU-T Recommendation P.53: "Psophometer for use on telephone-type circuits".3Definitions, abbreviations and symbols3.1DefinitionsFor the purposes of this ETS, the following definitions apply:Types of measurements:conducted measurements: Measurements which are made using a direct RF connection to theequipment under test.radiated measurements: Measurements which involve the measurement of a radiated field.aeronautical mobile service: A mobile service between aeronautical stations and aircraft stations, orbetween aircraft stations, in which survival craft stations may participate. Emergency position-indicatingradio beacon stations may also participate in this service on designated distress and emergencyfrequencies.Type of station:aeronautical station: A land station in the aeronautical mobile service.ground base station: Aeronautical station equipment fitted with an external 50 W antenna socket orconnector, for use with an external antenna and intended for use at a fixed location.SIST ETS 300 676 E1:2003



Page 10ETS 300 676: March 19973.2AbbreviationsFor the purposes of this ETS, the following abbreviations apply:AFAudio FrequencyAGCAutomatic Gain ControlAMAmplitude ModulationdBcdB relative to the carrier powerDSBDouble Side Bandemfelectro-motive forceICAOInternational Civil Aviation OrganizationIFIntermediate Frequencyppmparts per millionRFRadio Frequencyrmsroot mean squareSINAD(Signal + Noise + Distortion)/(Noise + Distortion)VSWRVoltage Standing Wave Ratio4General requirements4.1ConstructionThe mechanical and electrical construction and finish of the equipment shall conform in all respects togood engineering practice, and the equipment shall be suitable as part of a ground installation.All controls shall enable the control functions to be easily performed and the number of controls should bethe minimum necessary for simp
...