MF-HF DSC alerts are transmitted using what...

MF-HF DSC alerts are transmitted using what...

Question 1 of 27070m93CstR3598gw5avAfCc

MF-HF DSC alerts are transmitted using what emission type?

Question 1 of 27070

Q

MF-HF DSC alerts are transmitted using what emission type?

🔍 Key Concepts

• MF-HF Digital Selective Calling (DSC) is a narrow-band direct-printing data signal, not voice • The ITU emission designator for DSC on MF/HF uses frequency shift keying (FSK) with one audio channel • Know the difference between J3E/A3E (voice) and F1B/J2B (data/telex) emissions

💭 Think About

• Which of these emission types are normally associated with voice transmissions, and which are associated with data/telex/telecommand? • DSC is a short, automatic digital alert that precedes either voice or NBDP traffic. Which emission type matches a digital FSK signal on a single channel? • Look at which option mentions compatibility with SITOR (NBDP) versus compatibility with DSC receivers; which relationship actually exists in standard MF-HF distress and safety systems?

✅ Before You Answer

• Identify which designators ending in E are for telephony (voice) and which ending in B are for data/telex • Confirm that MF-HF DSC frequencies published in ITU/ITU‑R tables show a 1-channel FSK data emission, not single sideband voice • Verify which of the listed emissions is the standard for NBDP/SITOR and which is used for SSB voice so you don’t mix them up