What is BS EN 60835-1-2 - Terrestrial radio-relay systems and satellite earth stations about?
BS EN 60835 is a series on methods of measurement for equipment used in digital microwave radio transmission systems. Digital microwave radio transmission systems are the transmission of information by electromagnetic waves with wavelengths in the microwave range (1 m - 1 mm) of the electromagnetic spectrum. BS EN 60835-1-2 deals with the measurement of basic characteristics common to terrestrial radio-relay systems and satellite earth stations. These basic characteristics apply to all of the frequency ranges employed in the radio systems, i.e.:
- Radiofrequency
- Intermediate frequency
- Baseband (e.g., the clock frequency of the digital baseband signal)
The method of measurement for each parameter (e.g., return loss) is presented, wherever possible, as the single clause is applicable to any of the above frequency ranges. Where exceptions occur, they will be given in BS EN 60835-1-2.
Who is BS EN 60835-1-2 - Terrestrial radio-relay systems and satellite earth stations for?
BS EN 60835-1-2 on terrestrial radio-relay systems and satellite earth stations is useful for:
- Telecommunication component manufacturers
- Telecommunication equipment manufacturers
- Design engineers
- Quality control personnel
Why should you use BS EN 60835-1-2 - Terrestrial radio-relay systems and satellite earth stations?
Microwave signals are normally limited to the line of sight, so long-distance transmission using these signals requires a series of repeaters forming a microwave relay. Modern test sets often combine a number of different measurement functions under the control of a microprocessor. In this way generally, more than one parameter is checked and analysed step-by-step in accordance with specific software programmes. The results of the measurements are printed or plotted automatically and the programme description and tolerance analysis form part of the presentation of the results.
An example of such specialized equipment is a network analyser which combines two and four-port measurement facilities in one microprocessor-controlled unit. BS EN 60835-1-2 concentrates on the methods of measurement to be used in order to evaluate the noise figure of sub-systems and/or combinations of sub-systems under linear conditions where appropriate ports are available. Noise temperature is an important parameter in satellite systems and is a convenient indication of the noise power produced by a system or sub-system. It is usually expressed in terms of an “equivalent” temperature rather than an “actual” temperature since it is a measure of the effects of all the thermal and non-thermal noise sources. Using BS EN 60835-1-2 you can specify the measurement of basic characteristics common to terrestrial radio-relay systems and satellite earth stations.
