What must occur for the EPLRS RS to be operational after a power failure?

For the EPLRS RS (Enhanced Position Location Reporting System Radio Set) to be operational after a power failure, it is essential to reload the keys. This step is necessary because the encryption keys used for secure communications may be lost or rendered invalid during a power interruption. The keys are critical for maintaining the confidentiality and integrity of the data transmitted over the system, ensuring that only authorized users can access the communication network.

Retrying the authorization and authentication process is heavily dependent on having these keys available; without them, the system would not be able to securely initiate communications. The other options are not accurate needs after a power failure: resetting may be needed for other reasons but is not a requirement for functionality restoration; calibrating the antenna is more related to system performance than restoration post-failure; and installing new software typically is not a requirement unless there is a specific update or issue that necessitates it. Thus, reloading the keys directly addresses the critical need for operational capability after a power interruption.