Which statement is true regarding the data and audible alarm modes of DSC frequencies?

Which statement is true regarding the data and audible alarm modes of DSC frequencies?

• A. Data uses 156.525 MHz (VHF) and 2187.5 kHz (HF/MF); Audible Alarm uses 156.8 MHz and 2182 kHz
• B. Data uses 156.8 MHz and 2182 kHz; Audible Alarm uses 156.525 MHz and 2187.5 kHz
• C. Data uses 2182 kHz; Audible Alarm uses 2187.5 kHz
• D. Data uses 2187.5 kHz; Audible Alarm uses 156.8 MHz

Answer: (A)

DSC uses separate frequencies for data and for the audible alert, and these pairings are standardized for clarity across vessels. On VHF, the DSC data channel is 156.525 MHz, while the audible alert tone is transmitted on 156.8 MHz. On MF/HF, the DSC data channel is 2187.5 kHz, and the audible alert is 2182 kHz. This setup lets the system deliver the digital DSC information on the data frequencies and simultaneously provide a distinct audible cue on the alert frequencies. The other options mix these frequencies wrong, mixing data with the alert or swapping the correct pair.

DSC uses separate frequencies for data and for the audible alert, and these pairings are standardized for clarity across vessels. On VHF, the DSC data channel is 156.525 MHz, while the audible alert tone is transmitted on 156.8 MHz. On MF/HF, the DSC data channel is 2187.5 kHz, and the audible alert is 2182 kHz. This setup lets the system deliver the digital DSC information on the data frequencies and simultaneously provide a distinct audible cue on the alert frequencies. The other options mix these frequencies wrong, mixing data with the alert or swapping the correct pair.