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GB/T 19491-2004Technical requirements for INMARSAT B ship earth station (English PDF)

国际移动卫星B船舶地球站技术要求

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Issued by

General Administration of Quality Supervision, Inspection and Quarantine of the People Republic of China, China National Standardization Administration Committee

Level / Type

National · Recommended

Issue date

April 28, 2004

Implementation date

December 1, 2004

Scope

GB/T 19491-2004 is the English-translated version of 国际移动卫星B船舶地球站技术要求.

GB/T 19491-2004 is the Chinese standard "Technical requirements for INMARSAT B ship earth station". This standard specifies: International Mobile Satellite B ship earth station receive and transmit signal characteristics, antenna, receiving and transmitting system technical requirements, and connection control.

This standard applies to: G/T is equal to or greater than -4dBK- Inmarsat B ship earth station design, manufacture and equipment prior to production type approval and enabled applications.

It was issued by General Administration of Quality Supervision, Inspection and Quarantine of the People Republic of China, China National Standardization Administration Committee. Issued on 2004-04-28, in force from 2004-12-01. It cites 2 other standards.

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Document preview — GB/T 19491-2004

National Standard of the People's Republic of China

ICS: 33.060.30
Classification: U66

Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the People Republic of China, China National Standardization Administration Committee

[Preview only]
1 Scope
1.2 Normative References
1.3 Picture types
2.1 Definitions
2.2 Types of Receivers
2.3 Peripheral Connectors
2.4 Measurements
2.5 Equipment classification
2.6 Receiver and transmitter
2.7 Power controls and supply network impedances
2.8 Voltage change and flicker
2.9 Plastic pipes and fittings
3 1 test device
3.1 General Conditions
3.2 Test Signals
3.3 Radiofrequency (r.f.) Television Signal
3.4 Radiofrequency Input Signals
3.5 Measuring System and Test Instruments
3.6 Standard Measuring Conditions
4 Sample 1 and Sample Preparation
4.1 Electrical and Mechanical Performance
4.2 Power Consumption
4.3 REQUEST/RESPOND ser vice
5 Test Procedure 2
5.1 Tuning Characteristics
5.2 Sensitivity
5.3 Selectivity and Response to Undesired Signals
5.4 Cement mortar
6 2 eligibility criteria
6.1 Characteristics of the Luminance Channel
6.2 Characteristics of Chrominance Channel
6.3 Balanced transmission procedures
6.4 Manhole (handhole) overlay and tunnel trench cover slab
6.5 Hole rings and covers
7 Results
7.1 General Properties of the Picture
7.2 Synchronizing Quality
7.3 Picture Size Stability Versus Changes of CRT Beam Current
7.4 Characteristics Inherent in Projection Type Displays
7.5 Characteristics Inherent in DCD Displays
7.6 Characteristics Inherent in Widescreen Displays
8 Characteristics Inherent in the Receivers Using Double-rate Scan Display
8.1 General
8.2 Preliminary acceptance
8.3 Final acceptance
9 Disturbance on the Picture Due to Signals Inserted into the Field Blanking Interval
9.1 Introduction
9.2 Method of Measurement
9.3 Presentation of Results

1 Foreword

GB/T 19491-2004 was issued by General Administration of Quality Supervision, Inspection and Quarantine of the People Republic of China, China National Standardization Administration Committee on 28 April 2004 and has been in force since 1 December 2004.

The GB/T prefix marks a recommended standard. It is not law in itself: it becomes binding when a contract names it, when a regulation or a mandatory standard refers to it, or when a producer declares conformity with it.

The document runs to 30 pages in English translation.

2 Scope Preview

This standard specifies: International Mobile Satellite B ship earth station receive and transmit signal characteristics, antenna, receiving and transmitting system technical requirements, and connection control. This standard applies to: G/T is equal to or greater than -4dBK- Inmarsat B ship earth station design, manufacture and equipment prior to production type approval and enabled applications. It was issued by General Administration of Quality Supervision, Inspection and Quarantine of the People Republic of China, China National Standardization Administration Committee.

GB/T 19491-2004 falls under ICS 33.060.30, in the field of telecommunications.

This catalogue holds 1,124 other GB/T standards in that field.

In this catalogue, GB/T standards carry edition years from 1963 to 2026.

3 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document.

GB/T 13711-1992 — Technical requirements for INMARSAT A ship earth stations

GB/T 16982-1997 — Technical requirements of INMARSAT standard C ship earth station

4 About this standard

Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the People Republic of China, China National Standardization Administration Committee

English translation: about 30 pages (approximate)

5 Related standards

Standards on related subjects:

GB/T 18913-2025 — Ships and marine technology - Marine facsimile receivers for meteorological charts

GB/T 42724-2023 — Ships and marine technology - Navigation and ship operations - Guidelines for onboard telephone equipment

GB/T 13705-2019 — General requirements for shipboard radio communication installations

6 Classification and status

International classification (ICS): 33.060.30

Chinese Standard Classification (CCS): U 66

Prefix GB/T: recommended standard.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 30 pages — is available in the English PDF.

Referenced standards

Normative references

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