Table of Contents

FOREWORD
1 Scope
2 Normative references
3 Performance requirements
    3.1 Introduction
    3.2 Power supplies
    3.3 Control
    3.4 Interfaces
    3.5 Frequency indication
    3.6 Distress controls
    3.7 Control panel priority
    3.8 Labels
    3.9 Safety precautions
    3.10 Classes of emission
    3.11 Frequency bands
    3.12 Warming-up period
4 Transmitter
    4.1 Frequencies and classes of emission
    4.2 Frequency accuracy and stability
    4.3 Output power
    4.4 Transmitter input
    4.5 Permissible warming-up period
    4.6 Continuous operation
    4.7 Controls and indicators
    4.8 Safety precautions
    4.9 Power supply
    4.10 Synthesizer lock
    4.11 Channel switching
    4.12 NBDP transmit and receive timing
5 Receiver
    5.1 Frequencies and classes of emission
    5.2 Frequency stability and accuracy
    5.3 Usable sensitivity
    5.4 Receiver output
    5.5 Permissible warming-up period
    5.6 Immunity to interference
    5.7 Controls
    5.8 Power supply
    5.9 Antenna static protection
    5.10 Loudspeaker switching
    5.11 Noise reducer
    5.12 Audio gain control and automatic gain control
          (AGC)
    5.13 NBDP transmit and receive timing
6 Radiotelephone alarm signal generator
    6.1 Introduction
    6.2 General
    6.3 Frequency and duration of tones
    6.4 Modulation
    6.5 Controls
    6.6 Duration of alarm signal
    6.7 Alarm signal repeat
    6.8 Activation of the radio telephone transmitter
    6.9 Aural monitoring
7 Methods of testing and required test results
    7.1 Test conditions
    7.2 Performance check
    7.3 Environmental tests
    7.4 Electromagnetic compatibility (EMC)
    7.5 Immunity
    7.6 Acoustic noise
    7.7 Compass safe distance
    7.8 Safety precautions
    7.9 General conditions of measurement
8 Transmitter
    8.1 General
    8.2 Frequency error
    8.3 Output power and intermodulation products
    8.4 Unwanted frequency modulation
    8.5 Sensitivity of the microphone
    8.6 Sensitivity of the 600 omega line input for SSB
          telephony
    8.7 Automatic level control and/or limiter for SSB
          telephony
    8.8 Audio frequency response using SSB telephony
    8.9 Power of out-of-band emissions using SSB telephony
    8.10 Power of conducted spurious emissions of SSB
          telephony
    8.11 Residual hum and noise power using telephony
    8.12 Residual frequency modulation on DSC and NBDP
    8.13 Carrier suppression
    8.14 Continuous operation
    8.15 Protection of the transmitter
    8.16 Residual RF noise power
    8.17 Switching time for NBDP
9 Receiver
    9.1 Audio frequency output levels
    9.2 Frequency error
    9.3 Unwanted frequency modulation
    9.4 Audio frequency pass band
    9.5 Maximum usable sensitivity
    9.6 Harmonic content in output
    9.7 Adjacent channel selectivity
    9.8 Blocking
    9.9 Cross-modulation
    9.10 Intermodulation
    9.11 Spurious response rejection ratio
    9.12 Audio frequency intermodulation
    9.13 Conducted spurious emissions into the antenna
    9.14 Internally generated spurious signals
    9.15 Improvement in signal-to-noise ratio with AGC
    9.16 AGC range
    9.17 AGC time constants (attack and recovery time)
    9.18 Switching time for NBDP
    9.19 Reciprocal mixing
    9.20 Protection of input circuits
Figures
1 Limits for unwanted emission (MF/HF transmitter)
2 Limits for automatic level control
3 Limits for audio frequency response
Annexes
A Relationship between bit error rate (BER) input and
    symbol error rate (SER) output
B Bibliography
C Delays in equipment and its effect on narrow band direct
    printing communication in the GMDSS using the protocol
    in Recommendation ITU-R M.625

Abstract

Defines the minimum operational and performance requirements and methods of testing for transmitters and receivers capable of voice communication, digital selective calling and narrow band direct printing telegraphy for the GMDSS operating in either the medium frequency band only or in medium and high frequency bands.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	International Electrotechnical Committee
Pages
ISBN
Committee	TC 80