GB/T 12401-1990Specificationof antenna (including feed network) and servo system used in domestic satellitecommunication earth stations (English PDF)

3 Basic composition of the antenna (including the feed network) and the servo system

4 Definitions and general considerations

5 Interfaces of the antenna subsystem

6 Polarization modes of the antenna subsystem

7 Classification of the performance indices of the antenna-feeder-servo system

8 Requirements for the performance indices of the antenna-feeder-servo system

Foreword

This document was issued on 5 July 1990 by the State Bureau of Technical Supervision, and has been in force since 1 May 1991.

It is the first edition of this standard.

Classification: CCS M50.

About this edition

GB/T 12401-1990 is the first edition of this standard. It was issued on 5 July 1990 and has been in force since 1 May 1991.

There is no earlier edition to compare it with, so a specification that has to refer to this subject can only cite GB/T 12401-1990 itself.

The interval between issue and effect is the transition period. It exists so that producers, laboratories and buyers can requalify products, revise procedures and use up documentation before the new text becomes the one that applies. The date on this page is the official one from the record of the Standardization Administration.

Classification and status

GB/T 12401-1990 is classified under. ICS is the International Classification for Standards, the same scheme used by ISO and by the national bodies of most countries, which is what allows a Chinese standard to be placed beside its foreign counterparts on subject rather than on number.

Its Chinese Standard Classification code is CCS M50. CCS is the domestic scheme, a letter for the sector and two digits for the subject within it, and it is the code by which the standard is filed and searched in China.

The GB/T prefix marks a recommended national standard. It is not, in itself, law: 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. In practice that covers most of the cases in which it will be read — a purchase specification, an inspection agreement or a certification scheme.