🔍 Key Concepts

• RF interference coupling paths (how strong HF signals can get onto Inmarsat cabling/equipment) • Purpose of low‑pass filters vs. ferrite clamps vs. grounding changes • Impact of changing LNA (Low Noise Amplifier) bias on receiver performance

💭 Think About

• For each option, ask: does this action block or reduce unwanted HF energy from getting into the Inmarsat system, or might it actually make performance worse? • Think about what a low‑pass filter does to high‑frequency signals and whether that matches the Inmarsat operating band. • Consider whether changing the ground lead length usually improves or worsens RF interference problems, and what ferrite clamps are specifically designed to do on cables.

✅ Before You Answer

• Verify the frequency range Inmarsat operates in compared with typical HF transmitters. • Check which device (filter, ferrite, ground change, LNA bias) is normally used to suppress common‑mode RF on coaxial cables. • Confirm which option is least likely to degrade normal Inmarsat receive performance while still targeting the interference path.