An incoming Distress call requesting J3E emission may automatically switch to which frequency?

In the context of GMDSS (Global Maritime Distress and Safety System), an incoming distress call requesting J3E emission refers to a specific type of radio communication. J3E denotes a single sideband (SSB) amplitude modulation, which is often used for voice communications in maritime distress situations.

When a distress call is received, the GMDSS equipment is programmed to automatically switch to a designated frequency associated with maritime distress communications. In this case, the correct frequency for distress communication that aligns with J3E emissions is 16420.0 kHz. This frequency is recognized as a distress frequency for radiotelephony in the maritime band, providing a reliable channel for vessels to communicate during emergencies.

This frequency is commonly used by ships and rescue authorities to ensure effective communication during distress situations. The automatic switching feature is crucial to facilitate prompt responses and ensure that the necessary assistance can be coordinated quickly.

The other frequencies listed do not correspond to the standard distress frequencies utilized for such communications. Therefore, the choice of 16420.0 kHz perfectly aligns with the requirements of incoming distress calls using J3E emission, ensuring that vessels can maintain communication and receive help when needed.