What emission must be used when operating on...

What emission must be used when operating on...

Question 1 of 27070x6BobnocxEivuLjUrRjq

What emission must be used when operating on the MF distress and calling voice frequency?

Question 1 of 27070

Q

What emission must be used when operating on the MF distress and calling voice frequency?

🔍 Key Concepts

• MF distress and calling voice frequency used for GMDSS radiotelephony • Difference between J3E (SSB), A3E (AM), F3E (FM) emission designators • Which emissions are standard for maritime distress voice communications on MF/HF bands

💭 Think About

• First, recall the ITU and GMDSS standard for voice distress calls on MF: what type of telephony is specified? • Consider which emission types are commonly used on long-range MF/HF maritime radios for DSC versus for voice. • Think about where FM (F3E) is typically used in marine communications, and whether that fits MF distress and calling.

✅ Before You Answer

• Verify which emission designator is specified for 2182 kHz (traditional MF distress and calling voice frequency). • Confirm that DSC (digital selective calling) on MF uses a different emission than the voice distress channel. • Eliminate any emission types that are more typical of VHF line-of-sight or CW (Morse) rather than MF voice distress.