The RADAR display has sectors of solid video...

🔍 Key Concepts

• How spoking (radial solid lines on the radar screen) is usually related to the timing and movement of the antenna and sweep • The difference between problems caused by internal timing/rotation versus external interference • Which check can be done quickly and visually before getting into electronics or circuit faults

💭 Think About

• Ask yourself: Is this symptom more likely from something physically not moving or not synchronized, or from outside radio interference? • Which item on the list could you verify simply by watching the radar scanner on the mast, without tools or opening panels? • If the whole display has solid radial sectors, what does that suggest about how the radar beam is being swept around 360°?

✅ Before You Answer

• First think: Which option involves a basic mechanical/operational check rather than an electronic setting or failure? • Consider which factor must be correct before you start suspecting interference or circuit failures. • Visualize the antenna: if it is not behaving normally, would that create fixed radial streaks on the display?

The RADAR display has sectors of solid video (spoking). What would be the first thing to check?

Antenna information circuits failure.

Frequency of raster scan.

For interference from nearby ships .

Constant velocity of antenna rotation.

🔍 Key Concepts

💭 Think About

✅ Before You Answer