Installation & Maintenance Procedures Flashcards

A radar system shows a 'transmitter fault' alarm after maintenance. After confirming all connectors are secure, the technician should next check:

Answer: The magnetron heater voltage and anode current readings

Transmitter faults are most commonly traced to the magnetron; measuring heater voltage and anode current identifies filament failure or cathode emission degradation.

When installing multiple radar systems on a single vessel, what technique is used to prevent mutual interference between the two radars?

Answer: Staggering PRFs or using inter-pulse synchronization

Staggering or synchronizing PRFs between two onboard radars prevents their pulses from repeatedly coinciding and creating persistent interference arcs on each other's displays.

During routine maintenance, a technician finds moisture inside the radar display housing. The correct immediate action is to:

Answer: Power off, remove moisture, identify the ingress point, and reseal before restarting

Moisture inside electronics requires power-down, drying, sealing, and inspection before restart to prevent short circuits, corrosion, or PCB damage.

The radar performance monitor (echo box) is used post-installation to:

Answer: Provide a repeatable reference for overall system sensitivity and transmitter power

The performance monitor (echo box) gives a plume length reading that serves as a repeatable baseline for comparing current system performance against the original installation standard.

When installing radar on a sailing vessel, antenna placement must account for the mast and rigging. The key concern is:

Answer: Radar shadow sectors created by the mast and rigging blocking the beam

Masts and rigging intercept the radar beam and create blind sectors in the display; the antenna should be positioned to minimize these shadow sectors in critical directions.

A radar system's automatic frequency control (AFC) is misaligned after a magnetron replacement. The symptom on the display will be:

Answer: Weak or absent returns due to the receiver being off-tuned from the transmit frequency

AFC locks the local oscillator to track the magnetron frequency; misalignment leaves the receiver off-tuned, dramatically reducing sensitivity and target returns.

Which standard specifies the performance requirements that marine radar equipment must meet for SOLAS vessel carriage compliance?

Answer: IEC 62388

IEC 62388 is the international standard specifying minimum performance requirements for shipborne radar used on SOLAS-compliant vessels.