Using a new propagation measurement set-up, which produces a high number of data, enabling a proper statistical analysis, and resulting in very concise results, propagation measurements were performed and analized at 16 residential locations in The Netherlands in the frequency range from 1.8 to 28 MHz. In the whole frequency range the propagation loss appear to be higher than according the International Telecommunication Union ground-wave propagation model might be expected. Also typical characteristics of that model are not present, but instead the propagation shows a constant roll-off in dBs per decade, which slope is increasing with frequency. A regression curve could be established, and constants filled in. This statistical information may be used for building an accumulation model to lay a causality between source powers, source densities, and local Man-Made Noise levels.
The results of the man-made noise measurement campaign, organized by the Dutch society of radio amateurs, VERON, are compared with geographical data like the number of residential livings inside a circular area around the measurement location limited by a chosen distance. For each frequency band, correlation factors are derived as a function of the distance. It is shown that a strong correlation exists between the measured man-made noise floor and the density of habitation. This result proves that in this campaign, measured noise floor levels are mainly the result of accumulation of noise power from a large number of small sources spread in the houses, instead of being caused by a single, or a few, strong sources. The correlation is maximal at distances up to 200-300 m from the measurement location. Beyond that range, the correlation decreases, indicating that mainly sources in a range up to 300 m are relevant in determining the noise floor. This conclusion is supported by the observation that the slope of regression lines increasingly deviates from a theoretically derived slope at ranges over 300 m.
In this chapter the Man-Made Noise measuring campaign and the results thereof are described. The chapter is mainly based on the publication "Measurement Methodology and Results of Measurements of the Man-made Noise Floor on HF in The Netherlands" [II].
Using a new propagation measurement set-up, which produces a high number of data, enabling a proper statistical analysis, and resulting in very concise results, propagation measurements were performed and analized at 16 residential locations in The Netherlands in the frequency range from 1.8 to 28 MHz. In the whole frequency range the propagation loss appear to be higher than according the International Telecommunication Union ground-wave propagation model might be expected. Also typical characteristics of that model are not present, but instead the propagation shows a constant roll-off in dBs per decade, which slope is increasing with frequency. A regression curve could be established, and constants filled in. This statistical information may be used for building an accumulation model to lay a causality between source powers, source densities, and local Man-Made Noise levels.<br><br>
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