Question 1 of 20
Q
Which of the following devices can cause interference to Fleet 77/55 systems?
A
406 MHz Emergency Position Indicating Radio Beacons (EPIRBs) in the transmit mode.
B
9.3 GHz Search And Rescue RADAR Transponders (SARTs) in the transmit mode.
C
Transmitters operating in the 3-30 MHz range and shipboard RADARS in close proximity .
D
Survival Craft Equipment in the VHF range in the high power transmit mode.
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Question 1 / 20WujxP9pirU4wH76I12hv
Question 1 of 20WujxP9pirU4wH76I12hv

Which of the following devices can cause interference to Fleet 77/55 systems?

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Question 1 of 20
WujxP9pirU4wH76I12hv
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Which of the following devices can cause interference to Fleet 77/55 systems?

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🔍 Key Concepts

• Fleet 77/55 operate in the L-band (around 1.5–1.6 GHz) and are sensitive to strong nearby RF fields, even at other frequencies • Relative power levels and proximity of different radio and radar transmitters on a ship (HF, VHF, RADAR) • Difference between equipment used only in emergencies (EPIRB, SART, survival craft radios) versus equipment that is routinely transmitting on board

💭 Think About

• Which devices on the list normally operate with very high power and are often installed close to other antennas on the ship’s masts? • Which devices are designed mainly for emergency use only and are not expected to be a continuous interference source during normal operations? • How could strong RF from another system cause interference in Fleet 77/55 front-end receivers, even if it’s on a different frequency band?

✅ Before You Answer

• Check which option mentions high‑power transmitters located on the ship itself that may routinely operate near the satellite antenna. • Verify which listed devices are typically mounted close to the Fleet 77/55 antenna on the mast or superstructure. • Confirm which devices are primarily activated only in distress situations, making them less likely to be considered normal interference sources.

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