SIST HD 477.2.6 S1:2002

SIST HD 477.2.6 S1:2002 is a Slovenski inštitut za standardizacijo standard for methods of measurement in terrestrial radio-relay systems. It covers diversity equipment, twin-path equipment and hot stand-by equipment at a radio-relay station, and it tells users how to measure the sub-systems that make two or more receivers suitable for diversity reception. Engineers, test laboratories and equipment suppliers use it to apply the same measurement approach to these arrangements.

What does SIST HD 477.2.6 S1:2002 specify?

SIST HD 477.2.6 S1:2002 specifies measurement methods for sub-systems used in terrestrial radio-relay systems, with a focus on diversity, twin-path and hot stand-by equipment. The document sits in Part 2 of the series, which covers measurements for sub-systems.

The scope separates two areas of coverage:

• measurements on diversity equipment used to make two or more receivers suitable for diversity reception
• measurements on twin-path and hot stand-by equipment that are not treated in Part 2, Section Two

A key boundary is that the diversity equipment is the circuit for switching and/or combining the diversity channels, while the diversity channel equipment itself is outside that definition. In practice, that means the standard is concerned with how the diversity arrangement is measured as a system, not with redefining the transmitter, receiver, modulator or demodulator that may be part of the path.

The document also points readers to Part 2, Section Two for measurements related to the switch and the switching process. Those switch-related properties are treated as common to stand-by channel switching equipment and to diversity, twin-path and hot stand-by equipment.

What are the key requirements of SIST HD 477.2.6 S1:2002?

SIST HD 477.2.6 S1:2002 is primarily a measurement-method document, so the main technical points are the boundaries of what is measured and what is handled by reference to another section.

• The standard applies when two or more receivers at a radio-relay station are arranged for diversity reception. In practice, users should set up measurements on the diversity arrangement as a whole.
• Diversity equipment is the switching and/or combining circuit for the diversity channels. This matters because the measurement target is the combining or switching function, not every item in the channel.
• The diversity channel equipment itself is excluded from the definition of diversity equipment, although transmitters, receivers, modulators and demodulators may still take part in the measurements. This tells test teams which elements may appear in the setup without being the object under test.
• The section also covers twin-path equipment. For users, that means the document is not limited to one diversity architecture.
• The section also covers hot stand-by equipment. This is useful for systems that keep a backup path ready for immediate use.
• Measurements related to the properties of the switch and the switching process are not repeated here; they are covered by reference to Part 2, Section Two. In practice, users should not duplicate those tests in this section.
• The document ties its scope to sub-system measurement in terrestrial radio-relay systems. That helps buyers and labs confirm that they are using the right part of the series for backhaul-style radio links rather than for unrelated equipment.

What terms does SIST HD 477.2.6 S1:2002 define?

• Diversity equipment - The switching and/or combining circuit used to support diversity channels at a radio-relay station.
• Diversity reception - Reception using two or more receivers so the system can use diversity rather than a single path.
• Diversity channel equipment - The transmitter, receiver, modulator, demodulator or similar equipment in the individual diversity paths.
• Twin-path equipment - Equipment arrangement covered by the document alongside diversity and hot stand-by equipment.
• Hot stand-by equipment - A backup arrangement kept ready for immediate service, covered here as a measurement subject.
• Radio-relay station - The station at which the receivers and diversity arrangement are used.
• Switching process - The act of changing between paths, referred to Part 2, Section Two for measurement coverage.

Who uses SIST HD 477.2.6 S1:2002?

SIST HD 477.2.6 S1:2002 is used by designers and test engineers working on terrestrial radio-relay systems. It is also relevant to manufacturers and suppliers of diversity, twin-path and hot stand-by sub-systems who need repeatable measurement methods.

Testing laboratories use it when setting up evaluation or conformance-style measurements on radio-relay equipment. Quality managers and buyers can use it to check whether a proposed system is being measured against the right part of the series, especially when diversity switching or standby arrangements are involved.

Which standards are used with SIST HD 477.2.6 S1:2002?

The document refers users to Part 2, Section Two of the same series. That section covers measurements related to the properties of the switch and the switching process, which are common to stand-by channel switching equipment and to diversity, twin-path and hot stand-by equipment.

What does the SIST HD 477.2.6 S1:2002 document contain?

SIST HD 477.2.6 S1:2002 is a measurement-method section rather than a product specification. It frames the equipment under test, defines the scope of diversity equipment, and extends coverage to twin-path and hot stand-by equipment.

The document also states where switch-related measurements belong, by referring them to Part 2, Section Two. For users, that means this section is used to plan and interpret measurements on the diversity or standby arrangement itself, while switch properties are handled elsewhere in the series.

The front matter identifies it as the first edition, published in October 2002, under ICS 33.060.30.