Hätäsignaalitaajuus

Hätäsignaalitaajuus refers to specific radio frequencies designated for distress calls and emergency communications. These frequencies are crucial for maritime, aviation, and land-based emergency services to ensure prompt and reliable communication during critical situations.

In maritime contexts, the international distress frequency is 2182 kHz for radiotelephony and 4125 kHz for digital selective calling (DSC). For VHF maritime radio, channel 16 (156.800 MHz) is the primary distress and calling channel, while channel 70 is reserved for DSC alerts. These frequencies are monitored by coast stations and other vessels, allowing for rapid response to distress calls.

Aviation uses 121.5 MHz as an aeronautical emergency frequency for voice communications. Satellite-based systems also play a role in aviation distress, particularly with Emergency Locator Transmitters (ELTs) that transmit on 406 MHz.

Land-based emergency services, such as police, fire, and ambulance, often utilize dedicated private radio frequencies. However, in certain situations or for specific types of alerts, public emergency frequencies or systems might be employed. The concept of a hätäsignaalitaajuus underscores the importance of standardized and accessible communication channels for saving lives and mitigating disasters. The precise frequencies and their usage can vary slightly by region and specific regulatory bodies, but the underlying principle of dedicated emergency channels remains universal.