Mutual interference between communication satellites and terrestrial line-of-sight radio-relay systems

The paper examines the mutual interference to be expected between the satellites of broadband frequency-modulated satellite communication systems and high-capacity terrestrial line-of-sight radio-relay systems in the event of their sharing the 4 and 6 Gc/s communication bands. By comparing the resulting interference noise power in a 3.1 kc/s audio channel of a telephony system with the internationally agreed total noise power for such a channel, maximum permissible values are derived for the power flux arriving at the Earth´s surface from a satellite and for the effective radiated power of a terrestrial transmitter, which, if observed, would ensure that this interference is kept within acceptable bounds.