Which frequency does the DFIRS beacon transmit on?

Which frequency does the DFIRS beacon transmit on?

• A. 123 Hz
• B. 243 Hz
• C. 2.4 GHz
• D. 406 MHz

Answer: (D)

Beacons used for emergency location rely on a globally standardized distress frequency that supports satellite-enabled search and rescue. The DFIRS beacon transmits on 406 MHz, which is part of the COSPAS-SARSAT system. This frequency carries a digital signal with the beacon’s identity and status, allowing satellites to detect the beacon and relay precise location information to rescuers quickly. Earlier distress channels like low-frequency options or non-SAR bands aren’t used for satellite-based detection, and frequencies in ranges like 2.4 GHz aren’t designated for this purpose. So, 406 MHz is the correct transmission frequency for the DFIRS beacon.

Beacons used for emergency location rely on a globally standardized distress frequency that supports satellite-enabled search and rescue. The DFIRS beacon transmits on 406 MHz, which is part of the COSPAS-SARSAT system. This frequency carries a digital signal with the beacon’s identity and status, allowing satellites to detect the beacon and relay precise location information to rescuers quickly. Earlier distress channels like low-frequency options or non-SAR bands aren’t used for satellite-based detection, and frequencies in ranges like 2.4 GHz aren’t designated for this purpose. So, 406 MHz is the correct transmission frequency for the DFIRS beacon.