much lesser extent on the size distribution. The relationship between the differential attenuation and the phase allows the propagation analysis to be simplified because this analysis will depend mainly on one parameter. The importance of this simplification is apparent in the adaptive cancellation of crosspolarisation. For dual linearly polarised links, in the case where differential phase shift is the dominant cause of crosspolarisation, it is proposed to perform adaptive cancellation of the

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... ross-polarisation by means of a simplified network with only one variable parameter. Acknowledgments: It is a pleasure to acknowledge the help and co-operation of Dr. A. R. Holt of the Mathematics Department at Essex in providing the computed scattering amplitudes.