SIST EN 60835-2-8:2002/A1:2002

SIST EN 60835-2-8:2002/A1:2002 is the Slovenian adoption of an IEC amendment for methods of measurement on terrestrial radio-relay systems in digital microwave radio transmission systems. It specifies how to measure an adaptive equalizer under dynamic fading effects, so engineers and test labs can judge how the system behaves when the channel changes quickly.

What does SIST EN 60835-2-8:2002/A1:2002 specify?

SIST EN 60835-2-8:2002/A1:2002 is an amendment to the measurement methods for the adaptive equalizer section of digital microwave radio transmission equipment. Its focus is the behavior of the system under dynamic selective fading, which matters in practice because multipath propagation can move channel notches quickly.

The amendment reorganizes the document around a revised Clause 5 and updated figures. Clause 5 covers the test concept, the two sweep methods, how to present results, and the information that has to be stated in the equipment specification for the test.

What are the key requirements of SIST EN 60835-2-8:2002/A1:2002?

• Clause 5.1 explains that the radio channel changes with time, so the test should simulate rapid movement of fading notches. In practice, this means the equalizer is checked not only for static impairment but for its ability to cope with fast changes.
• Clause 5.2 defines two measurement approaches: sweeping the notch offset frequency and sweeping the relative echo amplitude. These two tests examine different parts of the adaptive equalizer response and the MP/NMP boundary.
• Clause 5.2.1 uses a triangular sweep of notch offset frequency and increases notch depth until the averaged BER reaches the outage value. The sweep width has to be large enough to include the outage signature and avoid edge effects, so the test remains representative.
• Clause 5.2.1 also requires tests at several sweep speeds and for both minimum-phase (MP) and non-minimum-phase (NMP) situations. This matters because the equalizer can react differently depending on which side of the channel condition is being exercised.
• Clause 5.2.2 sweeps the relative echo amplitude with a triangular waveform while the notch offset frequency is reduced until the averaged BER reaches the outage value. The text notes that 1/b is varied linearly during the NMP half-cycle to keep the notch speed variation comparable.
• Clause 5.2.2 requires several sweep speeds and both positive and negative notch offset frequencies. This gives a more complete check of behavior across the channel conditions the equipment may see in service.
• Clause 5.3 requires graphical presentation of the results, showing the notch depth or notch offset frequency that causes BER to exceed the outage criterion. The degradation is referenced to the minimum sweep speed, so the reader can see how much performance changes as dynamic stress increases.
• Clause 5.4 lists the details that the equipment specification has to state, including main system data, outage signature mask, ports for the two-path simulator, BERL, delay difference, equalizer type, and the test signal from the pattern generator. This is the information a lab needs to set up the test consistently.

What terms does SIST EN 60835-2-8:2002/A1:2002 define?

• Adaptive equalizer - The receiver function being measured, used to compensate for channel distortion in a digital microwave radio system.
• Dynamic fading effects - Fast changes in the channel caused by multipath propagation, which the test simulates.
• Minimum-phase (MP) - One of the channel conditions used in the sweep tests, treated separately from NMP.
• Non-minimum-phase (NMP) - The other channel condition used in the sweep tests, especially important at the MP/NMP boundary.
• BERL (Bit Error Ratio Limit) - The error threshold used to decide when the outage criterion has been reached.
• Outage signature - The characteristic channel condition used to set the sweep width and judge degradation.
• Two-path simulator - The test arrangement inserted between specified ports to create the fading conditions for the measurement.

Who uses SIST EN 60835-2-8:2002/A1:2002?

This standard is used by test laboratories, radio equipment manufacturers, and system designers working on digital microwave radio transmission systems and terrestrial radio-relay systems. They use it to set up repeatable measurements of adaptive equalizers and to compare results across sweep speeds, MP/NMP conditions, and positive or negative notch offsets.

Quality, compliance, and procurement teams also use it when they need a written test method for product specifications or acceptance testing. The details required in Clause 5.4 help them document the exact setup, signals, and outage criteria used in a measurement.

What changed in SIST EN 60835-2-8:2002/A1:2002 from the previous edition?

SIST EN 60835-2-8:2002/A1:2002 is identified as Amendment 1 to IEC 60835-2-8:1993/A1:1996, and the Slovenian standard is identical to EN 60835-2-8:1993/A1:1996.

The amendment:

• replaces the title of Clause 5 with Measurement of dynamic fading effects
• replaces the text of Clause 5 with the new measurement method
• adds figure titles and figures 10, 11a, 11b, 12a, and 12b

Which standards are used with SIST EN 60835-2-8:2002/A1:2002?

The document is the amendment to IEC 60835-2-8:1993, the parent standard for methods of measurement on terrestrial radio-relay systems, Part 2, Section 8: Adaptive equalizer. The Slovenian adoption also states identity with EN 60835-2-8:1993/A1:1996.

What does the SIST EN 60835-2-8:2002/A1:2002 document contain?

The document contains the revised Clause 5 for measuring dynamic fading effects, including the basic test concept, two sweep methods, and the way results are plotted. It also provides the updated figure set that illustrates the sweep waveforms and the graphical presentation of sensitivity.

Clause 5.4 gives the items that need to be stated in the detailed equipment specification, so the test can be reproduced with the right system data, simulator ports, delay difference, and sweep parameters. The added figures show the measurement schematics and example result plots used in laboratory testing and equipment evaluation.