Subelement B: MF-HF-DSC-SITOR (NBDP) Equip. & Ops— Topic :
Question 11B5
Element 9 (GMDSS Maintainer)Which of the following are assigned frequencies for Digital Selective Calling?
Explanation
Digital Selective Calling (DSC) utilizes specific, internationally designated frequencies for maritime distress, urgency, safety, and routine calling. These frequencies are an integral part of the Global Maritime Distress and Safety System (GMDSS).
The correct list of assigned DSC frequencies is:
* **2187.5 kHz:** The primary medium frequency (MF) DSC distress and safety calling frequency.
* **4207.5 kHz, 6312 kHz, 8414.5 kHz, 12577 kHz, 16804.5 kHz:** These are the high frequency (HF) DSC distress and safety calling frequencies across different bands.
Option B accurately lists these precise frequencies. The other options include frequencies that are either for voice communications (e.g., 2182 kHz is the international voice distress frequency, not DSC) or other maritime calling frequencies not designated for DSC.
Related Questions
11B3 What is the allowable frequency tolerance for GMDSS MF-HF transmitters?11B4 Using a frequency counter with an accuracy of 2 ppm which of the following are within legal tolerance for the frequencies of 2182.0 kHz and 4125.0 kHz? The counter has a display resolution of 1 Hz.11B6 What are the assigned frequencies for VOICE and SITOR (NBDP) follow on communications?12B1 What is the purpose of the “R.I.T.“ control on a MF/HF transceiver?12B2 What is the function of the “TUNE” button on a MF/HF transceiver?