SIST HD 467.2.3 S1:2002

SIST HD 467.2.3 S1:2002 is a Slovenian standard published by SIST for measuring the electrical characteristics of the low-noise amplifier used after a satellite earth station antenna. It gives measurement methods for engineers, laboratories, and buyers who need to check how a low-noise amplifier performs in a satellite receive chain.

What does SIST HD 467.2.3 S1:2002 specify?

SIST HD 467.2.3 S1:2002 specifies methods of measurement for the low-noise receiver amplifier that follows an earth station antenna. It also says that measurements are not limited to the listed ones, and that any additional tests are to be agreed between the parties concerned.

The document is organized into a short front matter and Section Three with clauses 1 to 11. The clauses cover scope, general test conditions, and measurements for gain, stability, frequency response, noise temperature, return loss, out-of-band effects, group delay, intermodulation, and AM/PM conversion.

What are the key requirements of SIST HD 467.2.3 S1:2002?

The standard focuses on how to set up the amplifier for measurement and which performance characteristics to check. In practice, it helps users define the test reference points, keep test levels appropriate, and compare amplifiers on the same basis.

• Clause 2 - General: The input and output ports of the amplifier shall be identified, and any associated networks such as filters, switches, or directional couplers shall be stated. The interface points are agreed between the parties, and test signals should be kept at levels comparable with normal operation or low enough to avoid compression or damage. This matters because the result depends on where the amplifier is referenced and whether it is driven correctly.
• Clause 3 - Power gain: Power gain is measured by the method in Part 1, Section Two, Clause 5. The clause also allows an output-level versus input-level curve to assess gain compression. This lets a tester see both the gain and how it changes as drive level rises.
• Clause 4 - Gain stability: Gain stability is the variation of actual gain with time from the initial gain at a specified frequency. The standard distinguishes short-term stability and long-term stability, and the measurement uses a time-recording instrument. This is useful when checking drift during operation or over a day of use.
• Clause 6 - Noise temperature: The standard recommends the hot/cold load method, also called the Y-method, and requires measurement at specified frequencies in a specified bandwidth. The calculation is referenced to the agreed subsystem input point and must account for line loss, physical temperature, and mismatch. This matters because noise performance is a key receive-chain parameter.
• Clause 7 - Input and output return loss: Return loss is measured using the method in Part 1, Section Two, Clause 4. This shows how well the amplifier is matched to the rest of the system, which affects reflections and measurement accuracy.
• Clause 8 - Out-of-band signals: Out-of-band signals can compress gain and increase noise temperature. The clause measures those effects by applying an out-of-band signal together with a test signal through a directional coupler and isolating device. This checks how the amplifier behaves when unwanted signals are present.
• Clauses 9 to 11: Group-delay/frequency characteristic, multi-carrier intermodulation ratio, and amplitude modulation/phase modulation conversion factor are measured by the corresponding methods in Part 1, Section Two. These tests matter when signal quality, nonlinear products, or phase distortion are important.

What terms does SIST HD 467.2.3 S1:2002 define?

• Gain stability - the change in actual gain over time from the initial gain at a specified frequency.
• Hot/cold load method - the noise-temperature method that uses two reference loads, one hot and one cold, to determine amplifier noise performance.
• Noise temperature - the measure used here to express the noise contribution seen at the agreed reference point of the amplifier.
• Return loss - the measure used to describe how well the input or output is matched to the connected system.
• Gain compression - the reduction in gain that appears when the amplifier is driven harder than its linear region.
• Multi-carrier intermodulation ratio - the measure of unwanted products created when more than one carrier is applied.
• Amplitude modulation/phase modulation conversion factor - the measure of how amplitude variations are converted into phase variations.

Who uses SIST HD 467.2.3 S1:2002?

SIST HD 467.2.3 S1:2002 is used by test laboratories, equipment manufacturers, and system engineers working on satellite earth stations. Quality managers and buyers can also use it when they need a common test basis for accepting a low-noise amplifier or comparing supplier data. It is especially relevant for receiver front-end work where gain, noise, matching, stability, and nonlinear behavior all affect system performance.

Which standards are used with SIST HD 467.2.3 S1:2002?

• IEC 510-1-2 (1984), Methods of measurement for radio equipment used in satellite earth stations, Part 1, Section Two - provides the common measurement methods that this standard reuses for gain, return loss, group delay, intermodulation, and AM/PM conversion.
• IEC 510-1-5 (1988), Section Five - Measurement of noise temperature - provides the calculation method and measurement conditions for noise temperature.

What does the SIST HD 467.2.3 S1:2002 document contain?

The document contains general measurement guidance and a clause-by-clause set of procedures for a low-noise amplifier in a satellite earth station receive chain. It covers how to identify the test ports, how to choose signal levels, and how to check stability under switching and overload. It also points the reader to the common Part 1 measurement methods where those methods are used directly.

For noise-temperature work, the document refers to the hot/cold load approach and to the calculation method in Part 1, Section Five. For out-of-band testing, it describes a setup with a directional coupler and isolating device so the effect of interfering signals can be measured alongside the wanted signal.