SIST EN 300 698-1 V1.3.1:2003

• Abstract:

  To update references. References to Appendix 18 of the Radio Regulations should refer to the Radio regulations dated 2001 and consequential changes.

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.060.20 - Receiving and transmitting equipment
• ICS: 33.100.01 - Electromagnetic compatibility in general
• ICS: 47.020.70 - Navigation and control equipment
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• 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 EN 300 698-1 V1.3.1 (2003-12) - Electromagnetic compatibility and Radio spectrum Matters (ERM); Radio telephone transmitters and receivers for the maritime mobile service operating in the VHF bands used on inland waterways; Part 1: Technical characteristics and methods of measurement

SIST EN 300 698-1 V1.3.1:2003 is the Slovenian adoption of ETSI EN 300 698-1 V1.3.1, a European telecommunications standard for maritime VHF radio telephone transmitters and receivers used on inland waterways. It specifies minimum technical characteristics and methods of measurement for shipborne equipment, and it includes special rules for Automatic Transmitter Identification System (ATIS) where that system is mandatory.

What does SIST EN 300 698-1 V1.3.1:2003 specify?

SIST EN 300 698-1 V1.3.1:2003 applies to VHF transmitters and receivers fitted with a 50 Ω external antenna socket or connector for use on board ships on inland waterways. It covers equipment operating in the 156 MHz to 174 MHz bands allocated to the maritime mobile service by the Radio Regulations [1].

The standard sets minimum requirements for construction, controls, channel use, test conditions, environmental checks, transmitter performance, receiver performance, and duplex operation. It also covers ATIS requirements in countries where ATIS is mandatory.

Annex	What it covers
Annex A	Power measuring receiver specification
Annex B	Automatic Transmitter Identification System (ATIS)
Annex C	Conversion of a radio call sign into an ATIS identification

What are the key requirements of SIST EN 300 698-1 V1.3.1:2003?

SIST EN 300 698-1 V1.3.1:2003 focuses on safe, controlled operation on inland waterway VHF channels and on measurable transmitter and receiver performance. In practice, it tells manufacturers what the equipment must do, and it tells test labs how to measure it.

Installation, channels and user control

Clause 4 requires construction suitable for shipboard use, simple controls, and no scanning or multiple watch facilities. The equipment must work on the channels defined in Appendix 18 of the Radio Regulations [1], and it must block user access to channels that are restricted by licence or by service use, such as channel 70 for non-DSC use and AIS1/AIS2 for non-AIS use.

This matters because inland waterway radios must stay on the correct channels and prevent accidental or unauthorized use. Clause 4 also requires channel 16 to be clearly marked and to select maximum transmitter power when chosen.

Power and switching behaviour

Clause 4 limits operation on certain channels to a low power range and requires automatic power reduction capability. It also requires the transmitter to stay off if the frequency synthesizer is out of lock or while a channel change is taking place.

This matters because it prevents out-of-band or unstable transmission. Clause 4.4 also limits switching times between channels and between transmit and receive, which is important for operational response.

Test conditions and measurement method

Clauses 5 and 6 define normal and extreme test conditions, power sources, test signals, squelch settings, artificial antenna arrangements, test channels, and measurement uncertainty handling. Clause 7 adds environmental tests, including vibration and damp heat cycle, with performance checks before and after.

This matters because compliance measurements need repeatable conditions, and the equipment must keep working after environmental stress.

Transmitter performance

Clause 8 covers frequency error, carrier power, frequency deviation, modulator limitation, microphone sensitivity, audio response, harmonic distortion, adjacent channel power, spurious emissions, residual modulation, transient frequency behaviour, and cabinet radiation.

These checks show whether the transmitter stays on frequency, stays within its channel, and avoids unnecessary interference. For a buyer or tester, this is the core evidence that the radio can be used on shared maritime channels without causing problems.

Receiver performance and duplex operation

Clause 9 covers receiver output power, audio response, maximum usable sensitivity, co-channel rejection, adjacent channel selectivity, spurious response rejection, intermodulation response, blocking, spurious emissions, limiter behaviour, noise and hum, squelch operation, squelch hysteresis, and radiated spurious emissions. Clause 10 covers receiver desensitization during simultaneous transmit and receive, plus receiver spurious response rejection.

These checks matter because the receiver must remain intelligible in a busy radio environment. Duplex operation also has to avoid self-interference and feedback.

ATIS

Annex B applies where ATIS is mandatory. It gives the system description, signal requirements, encoder requirements, format rules, error checking, and testing of the ATIS format.

What terms does SIST EN 300 698-1 V1.3.1:2003 define?

• Automatic Transmitter Identification System (ATIS) - an identification system for inland waterway VHF radio equipment, with a defined signal format and encoder rules.
• Digital Selective Calling (DSC) - a digital calling method used on maritime radio channels, especially relevant to channel 70.
• Signal + Noise + Distortion/Noise + Distortion (SINAD) - a receiver performance measure used to judge usable sensitivity and audio quality.
• Voltage Standing Wave Ratio (VSWR) - a measure of antenna match that affects how well transmitter power is coupled to the antenna.
• Radio Frequency (RF) - the radio signal domain used for transmission, reception, and emission measurements.
• root mean square (rms) - a signal level measure used in power and audio measurements.
• Frequency difference (fd) - the difference between frequencies, used in transmitter and receiver measurement descriptions.
• electromotive force (emf) - an electrical quantity used in measurement definitions.

Who uses SIST EN 300 698-1 V1.3.1:2003?

SIST EN 300 698-1 V1.3.1:2003 is used by radio equipment manufacturers, test laboratories, conformity assessment bodies, and technical teams responsible for inland waterway ship radios. It is also relevant to system integrators, installers, and quality or compliance managers who need to verify channel control, transmitter power, receiver selectivity, and ATIS behaviour.

Which standards are used with SIST EN 300 698-1 V1.3.1:2003?

The standard refers to these documents and parts:

• ITU Radio Regulations (2001) - provides the channel and service framework, including Appendix 18.
• ITU-T Recommendation E.161 (2001) - gives the digit and symbol arrangement for telephone-style keypads.
• ETSI EN 300 338 - covers equipment for Digital Selective Calling (DSC).
• IEC 61162-1 - covers digital interfaces for maritime navigation and radiocommunication equipment.
• ISO 694 - relates to positioning of magnetic compasses on ships.
• ETSI TR 100 028 (all parts) - provides uncertainty guidance for mobile radio measurements.
• ITU-T Recommendation O.41 (1994) - relates to psophometer use on telephone-type circuits.
• ITU-R Recommendation M.493-10 (2000) - covers the DSC system for the maritime mobile service.
• Council Directive 98/34/EC - is the legal basis noted for the mandate behind the standard.
• Part 2 and Part 3 of the same ETSI deliverable - cover the harmonized ENs for the essential requirements of the R&TTE Directive.

What does the SIST EN 300 698-1 V1.3.1:2003 document contain?

The standard contains clause-by-clause requirements and measurement methods, plus detailed annexes for test equipment and ATIS. It includes procedures for normal and extreme test conditions, environmental tests, transmitter measurements, receiver measurements, and duplex tests.

Annex A specifies the power measuring receiver used in measurements. Annex B defines the ATIS signal structure, encoder behaviour, modulation checks, and format testing. Annex C gives the method for converting a radio call sign into an ATIS identification, which is needed when configuring ATIS-capable radios.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.LWHYElectromagnetic compatibility and Radio spectrum Matters (ERM); Radio telephone transmitters and receivers for the maritime mobile service operating in the VHF bands used on inland waterways; Part 1: Technical characteristics and methods of measurement47.020.70Navigacijska in krmilna opremaNavigation and control equipment33.100.01Elektromagnetna združljivost na splošnoElectromagnetic compatibility in general33.060.20Sprejemna in oddajna opremaReceiving and transmitting equipmentICS:Ta slovenski standard je istoveten z:EN 300 698-1 Version 1.3.1SIST EN 300 698-1 V1.3.1:2003en01-december-2003SIST EN 300 698-1 V1.3.1:2003SLOVENSKI
STANDARD
ETSI ETSI EN 300 698-1 V1.3.1 (2003-12) 2
Reference REN/ERM-TG26-063-1 Keywords maritime, radio, VHF ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: [phone]
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Siret N° 348 623 562 00017 - NAF 742 C Association à but non lucratif enregistrée à la Sous-Préfecture de Grasse (06) N° 7803/88
Important notice Individual copies of the present document can be downloaded from: http://www.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at http://portal.etsi.org/tb/status/status.asp If you find errors in the present document, send your comment to: [e-mail] 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 2003. All rights reserved.
DECTTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the benefit of its Members. TIPHONTM and the TIPHON logo are Trade Marks currently being registered by ETSI for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. SIST EN 300 698-1 V1.3.1:2003

ETSI ETSI EN 300 698-1 V1.3.1 (2003-12) 3
Contents Intellectual Property Rights.7 Foreword.7 Introduction.7 1 Scope.8 2 References.8 3 Definitions and abbreviations.9 3.1 Definitions.9 3.2 Abbreviations.9 4 General requirements.9 4.1 Construction.9 4.2 Controls and indicators.10 4.3 Handset and loudspeaker.10 4.4 Switching time.10 4.5 Safety precautions.11 4.6 Class of emission and modulation characteristics.11 4.7 Facilities for DSC transmission and reception.11 4.8 Labelling.11 4.9 Warm up.12 5 Test conditions, power sources and ambient temperatures.12 5.1 Normal and extreme test conditions.12 5.2 Test power source.12 5.3 Normal test conditions.12 5.3.1 Normal temperature and humidity.12 5.3.2 Normal power sources.12 5.3.2.1 Mains voltage and frequency.12 5.3.2.2 Battery power source.12 5.3.2.3 Other power sources.12 5.4 Extreme test conditions.13 5.4.1 Extreme temperatures.13 5.4.2 Extreme values of test power sources.13 5.4.2.1 Mains voltage.13 5.4.2.2 Battery power source.13 5.4.2.3 Other power sources.13 5.5 Procedure for tests at extreme temperatures.13 6 General conditions of measurement.14 6.1 Arrangements for test signals applied to the receiver.14 6.2 Squelch.14 6.3 Normal test modulation.14 6.4 Artificial antenna.14 6.5 Arrangements for test signals applied to the transmitter.14 6.6 Tests on equipment with a duplex filter.14 6.7 Test channels.14 6.8 Measurement uncertainty and interpretation of the measured results.15 6.8.1 Measurement uncertainty.15 6.8.2 Interpretation of the measurement results.15 7 Environmental tests.15 7.1 Introduction.15 7.2 Procedure.16 7.3 Performance check.16 7.4 Vibration.16 7.5 Damp heat cycle.17 SIST EN 300 698-1 V1.3.1:2003

ETSI ETSI EN 300 698-1 V1.3.1 (2003-12) 4
8 Transmitter.17 8.1 Frequency error.17 8.1.1 Definition.17 8.1.2 Method of measurement.17 8.1.3 Limits.17 8.2 Carrier power.17 8.2.1 Definitions.17 8.2.2 Method of measurement.17 8.2.3 Limits.18 8.2.3.1 Normal test conditions.18 8.2.3.2 Extreme test conditions.18 8.3 Frequency deviation.18 8.3.1 Definition.18 8.3.2 The maximum frequency deviation at modulation frequencies below 3 kHz.18 8.3.2.1 Method of measurement.18 8.3.2.2 Limits.18 8.3.3 The maximum frequency deviation at modulation frequencies above 3 kHz.18 8.3.3.1 Method of measurement.18 8.3.3.2 Limits.19 8.4 Limitation characteristics of the modulator.19 8.4.1 Definition.19 8.4.2 Method of measurement.19 8.4.3 Limits.19 8.5 Sensitivity of the modulator, including microphone.20 8.5.1 Definition.20 8.5.2 Method of measurement.20 8.5.3 Limits.20 8.6 Audio frequency response.20 8.6.1 Definition.20 8.6.2 Method of measurement.20 8.6.3 Limit.20 8.7 Audio frequency harmonic distortion of the emission.21 8.7.1 Definition.21 8.7.2 Method of measurement.21 8.7.2.1 Normal test conditions.22 8.7.2.2 Extreme test conditions.22 8.7.3 Limit.22 8.8 Adjacent channel power.22 8.8.1 Definition.22 8.8.2 Method of measurement.22 8.8.3 Limits.22 8.9 Conducted spurious emissions conveyed to the antenna.23 8.9.1 Definition.23 8.9.2 Method of measurement.23 8.9.3 Limit.23 8.10 Residual modulation of the transmitter.23 8.10.1 Definition.23 8.10.2 Method of measurement.23 8.10.3 Limit.23 8.11 Transient frequency behaviour of the transmitter.23 8.11.1 Definitions.23 8.11.2 Method of measurement.24 8.11.3 Limits.25 8.12 Cabinet radiation and conducted spurious emissions other than those conveyed to the antenna.27 8.12.1 Definitions.27 8.12.2 Method of measurement.27 8.12.3 Limits.28 9 Receiver.28 9.1 Harmonic distortion and rated audio frequency output power.28 9.1.1 Definition.28 9.1.2 Method of measurement.28 SIST EN 300 698-1 V1.3.1:2003

ETSI ETSI EN 300 698-1 V1.3.1 (2003-12) 5
9.1.3 Limits.29 9.2 Audio frequency response.29 9.2.1 Definition.29 9.2.2 Method of measurement.29 9.2.3 Limits.30 9.3 Maximum usable sensitivity.30 9.3.1 Definition.30 9.3.2 Method of measurement.31 9.3.3 Limits.31 9.4 Co-channel rejection.31 9.4.1 Definition.31 9.4.2 Method of measurement.31 9.4.3 Limit.31 9.5 Adjacent channel selectivity.31 9.5.1 Definition.31 9.5.2 Method of measurement.32 9.5.3 Limits.32 9.6 Spurious response rejection.32 9.6.1 Definition.32 9.6.2 Method of measurement.32 9.6.3 Limit.32 9.7 Intermodulation response.33 9.7.1 Definition.33 9.7.2 Method of measurement.33 9.7.3 Limit.33 9.8 Blocking or desensitization.33 9.8.1 Definition.33 9.8.2 Method of measurement.33 9.8.3 Limit.34 9.9 Conducted spurious emissions conveyed to the antenna.34 9.9.1 Definition.34 9.9.2 Method of measurement.34 9.9.3 Limit.34 9.10 Amplitude response of the receiver limiter.34 9.10.1 Definition.34 9.10.2 Method of measurement.34 9.10.3 Limit.34 9.11 Receiver noise and hum level.34 9.11.1 Definition.34 9.11.2 Method of measurement.35 9.11.3 Limit.35 9.12 Squelch operation.35 9.12.1 Definition.35 9.12.2 Method of measurement.35 9.12.3 Limits.35 9.13 Squelch hysteresis.36 9.13.1 Definition.36 9.13.2 Method of measurement.36 9.13.3 Limit.36 9.14 Radiated spurious emissions.36 9.14.1 Definition.36 9.14.2 Method of measurements.36 9.14.3 Limit.37 10 Duplex operation.37 10.1 Receiver desensitization with simultaneous transmission and reception.37 10.1.1 Definition.37 10.1.2 Method of measurement.37 10.1.3 Limits.38 10.2 Receiver spurious response rejection.38 Annex A (normative): Power measuring receiver.39 SIST EN 300 698-1 V1.3.1:2003

ETSI ETSI EN 300 698-1 V1.3.1 (2003-12) 6
A.1 Power measuring receiver specification.39 A.1.1 IF filter.39 A.1.2 Attenuation indicator.40 A.1.3 RMS value indicator.40 A.1.4 Oscillator and amplifier.40 Annex B (normative): Automatic Transmitter Identification System (ATIS).41 B.1 System description.41 B.1.1 General.41 B.1.2 Technical requirements.41 B.1.3 Signal requirements.41 B.1.4 Format of an ATIS signal sequence.42 B.1.5 Dot pattern.43 B.1.6 Phasing.43 B.1.7 Format specifier.44 B.1.8 Identification.44 B.1.9 End of sequence.44 B.1.10 Error check character.44 B.1.11 Conversion of a call sign to MID.44 B.2 ATIS encoder.46 B.2.1 Internally generated signals.46 B.2.2 Frequency error (demodulated signal).46 B.2.2.1 Definition.46 B.2.2.2 Method of measurement.46 B.2.2.3 Limits.46 B.2.3 Modulation index.46 B.2.3.1 Definition.46 B.2.3.2 Method of measurement.46 B.2.3.3 Limits.46 B.2.4 Modulation rate.46 B.2.4.1 Definition.46 B.2.4.2 Method of measurement.47 B.2.4.3 Limits.47 B.2.5 Testing of the ATIS format.47 Annex C (normative): Conversion of a radio call sign into an ATIS identification.48 History.49
ETSI ETSI EN 300 698-1 V1.3.1 (2003-12) 7
Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http://webapp.etsi.org/IPR/home.asp). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This European Standard (Telecommunications series) has been produced by ETSI Technical Committee Electromagnetic compatibility and Radio spectrum Matters (ERM). The present document is part 1 of a multi-part deliverable covering the Electromagnetic compatibility and Radio Spectrum Matters (ERM); Radio telephone transmitters and receivers for the maritime mobile service operating in the VHF bands used on inland waterways, as identified below: Part 1: "Technical characteristics and methods of measurement"; Part 2: "Harmonized EN covering essential requirements of article 3.2 of the R&TTE Directive"; Part 3: "Harmonized EN covering essential requirements of article 3.3 (e) of the R&TTE Directive".
National transposition dates Date of adoption of this EN: 21 November 2003 Date of latest announcement of this EN (doa): 29 February 2004 Date of latest publication of new National Standard or endorsement of this EN (dop/e):
31 August 2004 Date of withdrawal of any conflicting National Standard (dow): 31 August 2004
Introduction The present document has been produced by ETSI in response to a mandate from the European Commission issued under Council Directive 98/34/EC [9] laying down a procedure for the provision of information in the field of technical standards and regulations. SIST EN 300 698-1 V1.3.1:2003

ETSI ETSI EN 300 698-1 V1.3.1 (2003-12) 8
1 Scope The present document lays down the minimum requirements for VHF radio transmitters and receivers operating on board ships in frequency bands allocated to the maritime mobile service, used on inland waterways as defined by Regional Agreements or responsible Administrations. The present document applies to VHF transmitters and receivers fitted with a 50 Ω external antenna socket or connector for use on board ships on inland waterways and operating in the bands between 156 MHz and 174 MHz allocated to the maritime mobile service by the Radio Regulations [1], Appendix 18. For countries where the Automatic Transmitter Identification System (ATIS) is mandatory, the requirements of annex B apply. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. • References are either specific (identified by date of publication and/or edition number or version number) or non-specific. • For a specific reference, subsequent revisions do not apply. • For a non-specific reference, the latest version applies. Referenced documents which are not found to be publicly available in the expected location might be found at http://docbox.etsi.org/Reference. [1] ITU Radio Regulations (2001). [2] ITU-T Recommendation E.161 (2001): "Arrangement of digits, letters and symbols on telephones and other devices that can be used for gaining access to a telephone network". [3] ETSI EN 300 338: "Electromagnetic compatibility and Radio spectrum Matters (ERM); Technical characteristics and methods of measurement for equipment for generation, transmission and reception of Digital Selective Calling (DSC) in the maritime MF, MF/HF and/or VHF mobile service". [4] IEC 61162-1: "Maritime navigation and radiocommunication equipment and systems - Digital interfaces - Part 1: Single talker and multiple listeners". [5] ISO 694: "Ships and marine technology - Positioning of magnetic compasses in ships". [6] ETSI TR 100 028 (all parts): "ElectroMagnetic Compatibility and Radio Spectrum Matters (ERM); Uncertainties in the measurement of mobile radio equipment characteristics ". [7] ITU-T Recommendation O.41 (1994): "Psophometer for use on telephone-type circuits". [8] ITU-R Recommendation M.493-10 (2000): "Digital selective-calling system for use in the maritime mobile service". [9] Council Directive 98/34/EC of the European Parliament and of the Council of 22 June 1998 laying down a procedure for the provision of information in the field of technical standards and regulations. SIST EN 300 698-1 V1.3.1:2003

ETSI ETSI EN 300 698-1 V1.3.1 (2003-12) 9
3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the terms and definitions given in the Radio Regulations [1] apply. 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: ad amplitude difference ATIS Automatic Transmitter Identification System DSC Digital Selective Calling DX first transmission emf electromotive force fd frequency difference RF Radio Frequency rms root mean square RX re-transmission SINAD Signal + Noise + Distortion/Noise + Distortion VSWR Voltage Standing Wave Ratio 4 General requirements 4.1 Construction The mechanical and electrical construction and finish of the equipment shall conform in all respects to good engineering practice, and the equipment shall be suitable for use on board ships. All controls shall be of sufficient size to enable the usual control functions to be easily performed and the number of controls should be the minimum necessary for simple and satisfactory operation. For the purpose of conformance testing, relevant technical documentation shall be supplied with the equipment. The VHF maritime mobile service uses both single-frequency and two-frequency channels. For two-frequency channels the Radio Regulations require a separation of 4,6 MHz between the transmitting frequency and the receiving frequency. The equipment shall be capable of operating on single frequency and two-frequency channels with manual control (simplex). It may also be capable of operating on two-frequency channels without manual control (duplex). No scanning or multiple watch facilities shall be implemented. The equipment shall be able to operate on all channels defined in the Radio Regulations [1], Appendix 18. Operation on channels 75 and 76 shall be limited to an output power of 1 W by appropriate means. Additional VHF channels outside those defined by the Radio Regulations Appendix 18 [1] may also be provided, but means shall be provided to block any or all of these additional channels, as may be required by the licence before installation on board vessels. It shall not be possible for the user to unblock any blocked channels. The equipment shall be so designed that use of channel 70 for purposes other than DSC is prevented, and that use of channels AIS1 and AIS2 for purposes other than AIS is prevented. The possibility to apply automatic power reduction to any of these channels shall be available. It shall not be possible for the user to change the programmed settings of these channels.
The output power shall be automatically limited to a value between 0,5 W and 1 W on the following channels: - 6, 8, 10, 11, 12, 13, 14, 15, 17, 71, 72, 74, 75, 76 and 77. SIST EN 300 698-1 V1.3.1:2003

ETSI ETSI EN 300 698-1 V1.3.1 (2003-12) 10 It shall not be possible to transmit while any frequency synthesizer used within the transmitter is out of lock. It shall not be possible to transmit during channel switching operations. 4.2 Controls and indicators The equipment shall have a channel selector and shall indicate the designator, as shown in the Radio Regulations [1], Appendix 18, of the channel at which the installation is set. The channel designator shall be legible irrespective of the external lighting conditions. Channel 16 shall be distinctively marked. Selection of channel 16, shall be preferably by readily accessible means (e.g. a distinctively marked key). Selection of channel 16 by any means shall automatically set the transmitter output power to maximum. This power level may subsequently be reduced by manual user control if required. Where an input panel on the equipment for entering the digits 0 - 9 is provided, this shall conform to ITU-T Recommendation E.161 [2]. The equipment shall have the foll
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