Abstract
AbstractThis paper analyses the Ku‐band versus C‐band transmission for digital and/or analogue TV, keeping in mind Ku‐band attenuation in the tropical climate as a function of earth‐station antenna elevation angle. The analysis is done for the case that adjacent satellites illuminate the same converage area and that interfering signals are of same e.i.r.p. and spectral make‐up. It is shown that a multiplex of compressed digital carriers requires smaller receiving antennas than a single analogue TV carrier. It turns out that because of low power requirements of the compressed digital carrier and/or for high e.i.r.p. values, the earth‐station antenna diameter is interference limited. Below the interference limit the aperture can only be reduced by applying an elliptical area to provide for a narrower beamwidth along the geostationary arc.
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