What is the impact of using excessive effective radiated power on a satellite uplink?

Using excessive effective radiated power on a satellite uplink can lead to bandwidth and frequency interference, which may block access for other users who are attempting to communicate through the same satellite system. When one user transmits with significantly higher power than necessary, the likelihood increases that their signal will occupy more of the satellite's available frequency space, thereby preventing other users from establishing strong communications links. This scenario creates an unfair situation in shared communication channels and can disrupt overall network performance.

While the other options mention different potential impacts on satellite systems, they do not directly address the consequences of excessive power on shared frequency usage. In contrast, blocking access emphasizes the crucial aspect of equitable resource allocation in satellite communications, making it a direct effect of excessive radiated power.