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Range markers on a RADAR display are determined by the timer or timing circuitry within the RADAR system. The timer is responsible for measuring the time taken for the transmitted RADAR pulse to travel to the target and return as an echo. By measuring this time, the RADAR system can calculate the distance to the target and display range markers on the screen.

Mnemonic: "TICK - Timer Indicates Calculated Range"

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What would be the frequency of a range ring marker oscillator generating range rings at 10 nautical miles intervals?

8 kHz

The frequency can be calculated using the formula:

Frequency (f) = 1 / Time Period (T)

Where:

• Frequency (f) is measured in Hertz (Hz).
• Time Period (T) is measured in seconds (s).

For a round-trip time period, considering the range interval of 10 nautical miles:

Range Interval = 10 nautical miles ≈ 18,520 meters (since 1 nautical mile ≈ 1852 meters).

Speed of Light ≈ 299,792,458 meters per second or about 1,852,000 nautical miles per second.

Time Period (Round-Trip) = 2 * (Range Interval / Speed of Light)

Time Period (Round-Trip) = 2 * (18,520 / 299,792,458) ≈ 1.2386 × 10^-4 seconds

Frequency = 1 / Time Period (Round-Trip) ≈ 1 / (1.2386 × 10^-4) ≈ 8079.37 Hz, or ≈ 8 kHz

Mnemonic: "Eight at 10"

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