Joint utilization of the frequency spectrum by direct radio and communication satellite systems

The paper discusses the sources of disturbances of either the satellite signal or the signal of a ground-based direct radio system when the two systems are using a common frequency. By means of limitations on power flux density and carrier blurring, it is possible to reduce mutual interference. The effect of such provisions on the transmitting capacity of communication satellites is studied, and it is shown that the optimal frequency band is limited by power flux density limitations.