🔍 Key Concepts

• J3E emission means single sideband, suppressed carrier radiotelephony • Know which frequencies are designated GMDSS distress and safety channels versus calling/working channels • Distress frequencies in HF/MF bands have specific pairings of mode and purpose (voice vs DSC)

💭 Think About

• First, identify which of the listed frequencies are known HF/MF GMDSS distress and safety VOICE channels, not DSC-only channels • Check which of these frequencies are associated with DSC (digital selective calling) and which are for radiotelephony (voice); J3E is used for voice • Look at the typical GMDSS HF distress VOICE frequencies and see which answer choice groups them correctly together

✅ Before You Answer

• Verify which frequencies are DSC distress (F1B/J2B type emissions) and therefore NOT correct for J3E voice • Confirm that 2182 kHz has a specific traditional use and see whether it is primary in GMDSS distress today • Match each option’s frequencies against an official list of HF/MF distress and safety radiotelephony channels used with J3E emission