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Paramount role is played by the nature of the service and by the technical countermeasures adopted to face the impairments.Typically the end-user's perception of the quality of the service is based on the throughput, delay, data channel efficiency/loading, availability, data channel error rate, and network connectivity.Under degraded conditions, the delay can increase, throughput can decrease, and call set-up times may become too long.The effects of propagation anomalies on some of the parameters are considered in the paper and some results of extensive attenuation measurements are given.As an example, a Ka VSAT system that exploits suitable impairment counter-measure is shown. The performance of the proposed communication system is evaluated using the experimental data and a comparison with the results obtained using ITU-R prediction methods is presented, as well.

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