🔍 Key Concepts

• On-scene communications during SAR (Search and Rescue) operations • Purpose of VHF Channel 16 versus VHF Channel 70 • Meaning of emission designators like J3E, J2B, F1B for voice vs. digital/telex

💭 Think About

• Which VHF channel is used for voice coordination between units once a distress is ongoing and everyone is on scene? • Among J3E, J2B, and F1B, which one is associated with SSB voice (single sideband radiotelephony) rather than digital selective calling or telex? • Why would SAR aircraft and surface units need a common voice frequency rather than a digital-only channel at the scene?

✅ Before You Answer

• Identify which option includes VHF Ch-16 (international distress, safety, and calling voice channel). • Confirm which HF/MF emission designator (J3E vs J2B vs F1B) corresponds to voice radiotelephony. • Verify which HF aeronautical SAR frequency pair (in kHz) is commonly used for on-scene coordination with aircraft.