MARITIME NAVIGATION AND RADIOCOMMUNICATION EQUIPMENT AND SYSTEMS - VHF RADIOTELEPHONE EQUIPMENT INCORPORATING CLASS 'D' DIGITAL SELECTIVE CALLING (DSC) - METHODS OF TESTING AND REQUIRED TEST RESULTS
International Electrotechnical Committee
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms, definitions and abbreviations
3.1 Definitions
3.2 Abbreviations
4 General and operational requirements
4.1 General
4.2 Composition
4.3 Construction
4.4 Controls and indicators
4.5 Facilities for coding and decoding of DSC
4.6 DSC display
4.7 Handset and loudspeaker
4.8 Safety precautions
4.9 Labelling
4.10 Warm up
5 Technical requirements
5.1 Switching time
5.2 Class of emission and modulation characteristics
5.3 Facilities for DSC transmission and reception
5.4 Ships identity - MMSI and Group MMSI
5.5 Entry of position information
5.6 Alarm circuits for incoming calls
5.7 Multiple watch facilities
5.8 Built-in test
6 General conditions of measurement
6.1 Arrangements for test signals applied to the receiver
input
6.2 Squelch
6.3 Normal test modulation
6.4 Artificial antenna
6.5 Arrangements for test signals applied to the transmitter
input
6.6 Test channels
6.7 Generation and examination of the digital selective call
signal
6.8 Standard test signals for DSC
6.9 Determination of the symbol error ratio in the output of
the receiving part
6.10 Measurement uncertainty and interpretation of the measured
results
6.11 Test conditions, power sources, and ambient temperatures
6.12 Normal test conditions
6.13 Extreme test conditions
6.14 Procedure for tests at extreme temperatures
7 Environmental tests
7.1 Introduction
7.2 Procedure
7.3 Performance check
7.4 Vibration test
7.5 Temperature tests
8 Transmitter
8.1 Frequency error
8.2 Carrier power
8.3 Frequency deviation
8.4 Sensitivity of the modulator, including microphone
8.5 Audiofrequency response
8.6 Audiofrequency harmonic distortion of the emission
8.7 Adjacent channel power
8.8 Conducted spurious emissions conveyed to the antenna
8.9 Transient frequency behaviour of the transmitter
8.10 Residual modulation of the transmitter
8.11 Frequency error (DSC signal)
8.12 Modulation index for DSC
8.13 Modulation rate for DSC
8.14 Testing of generated call sequences
9 Radiotelephone receiver
9.1 Harmonic distortion and rated audiofrequency output power
9.2 Audiofrequency response
9.3 Maximum usable sensitivity
9.4 Co-channel rejection
9.5 Adjacent channel selectivity
9.6 Spurious response rejection
9.7 Intermodulation response
9.8 Blocking or desensitization
9.9 Spurious emissions
9.10 Receiver residual noise level
9.11 Squelch operation
9.12 Squelch hysteresis
9.13 Multiple watch characteristic
10 Receiver for DSC decoder
10.1 Maximum usable sensitivity
10.2 Co-channel rejection
10.3 Adjacent channel selectivity
10.4 Spurious response and blocking immunity
10.5 Intermodulation response
10.6 Dynamic range
10.7 Spurious emissions
10.8 Verification of correct decoding of various types of DSC
calls
10.9 Reaction to VTS and AIS channel management DSC
transmissions
10.10 Simultaneous reception
11 Electromagnetic compatibility
Annex A (normative) DSC Calls
Annex B (normative) Power measuring receiver specification
B.1 IF filter
B.2 Attenuation indicator
B.3 RMS value indicator
B.4 Oscillator and amplifier
Annex C (informative) Summary of major differences of this
standard from existing regional standards
C.1 European Standard EN 301 025
C.2 American Standard RTCM Special Committee No 101
Annex D (informative) Recommended standards for equipment
operating in high level electromagnetic environments
D.1 Introduction
D.2 Method of measurement
D.3 Limits
Annex E (informative) International VHF marine radio channels
and frequencies
Annex F (informative) U.S. VHF marine radio channels and
frequencies
Annex G (informative) CANADIAN VHF marine radio channels and
frequencies
Figures
Includes the minimum requirements for general communication for shipborne fixed installations using a VHF radiotelephone incorporating class 'D' Digital Selective Calling. Also defines technical characteristics, methods of measurement and required test results.
| Document Type | Standard |
| Status | Current |
| Publisher | International Electrotechnical Committee |
| Committee | TC 80 |
