The performance evaluation of television line and microwave links using sine-squared test techniques

The principles involved in the use of sine-squared pulse test techniques and the application of this type of test to the assessment of the linear transmission performance of television line and microwave radio links are surveyed in detail. The characteristics of the sine-squared pulse are dealt with from both a mathematical and practical point of view, attention being drawn to the essential difference and flexibility of waveform test techniques as opposed to the steady state type of tests (gain/frequency ¿phase/frequency). The application of waveform testing to the linear performance evaluation of television line and radio links on a day-to-day and commissioning basis are dealt with and methods of expressing the inherent waveform distortion in terms of a isT-rating with reference to a given waveform tolerance are explained. Finally, there are examples of waveform tests as applied to the linear performance assessment to studio centre¿transmitter links and other items of equipment.