Marine radar determines target range by measuring:
Fcc Ship Radar Endorsement Radar Theory
Question · Easy
The speed of radio-frequency energy in free space is approximately:
If a marine radar pulse takes 61.7 microseconds round trip to a target, the approximate target range is:
Question · Medium
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Pulse repetition frequency (PRF) is best described as:
If a radar has a PRF of 2,000 Hz, the pulse repetition interval (PRI) is:
A radar has a PRF of 2,500 Hz. What is the maximum unambiguous range?
Question · Hard
Pulse width primarily affects which two radar performance parameters?
Range resolution of a pulse radar with a 0.1 microsecond pulse width is approximately:
Marine X-band radar typically operates at what frequency?
Compared to S-band radar, X-band marine radar generally:
Wavelength is related to frequency by the formula:
Duty cycle of a pulse radar is defined as:
If peak power is 25 kW, pulse width 0.5 microseconds, and PRF 1,000 Hz, the average transmitter power is:
Bearing resolution of a marine radar is determined primarily by:
Why does shipboard radar use horizontally polarized radiation?
Radar horizon distance is slightly greater than the optical horizon because:
Small targets at long range are best detected by using:
Increasing the pulse width without changing PRF will:
If two targets on the same bearing are separated by 50 meters in range, what pulse width is required to resolve them?
PRF must be lowered when the radar is switched to a longer range scale because:
The magnetron in a marine radar functions as the:
Fcc Ship Radar Endorsement Components
Inside a cavity magnetron, electrons are forced into circular paths by:
The modulator in a pulse radar transmitter:
A pulse-forming network (PFN) in a line-type modulator is used to:
The purpose of the radar duplexer (or circulator) is to:
A TR (transmit-receive) cell is typically a:
In a superheterodyne radar receiver, the mixer combines the incoming RF echo with the:
A typical marine radar intermediate frequency (IF) is in the range of:
Automatic Frequency Control (AFC) in a marine radar receiver maintains the:
The IF amplifier in a pulse radar is required to have:
A klystron or traveling-wave tube (TWT) may be used in a coherent radar transmitter because:
The video amplifier in a marine radar follows the:
A crystal mixer diode in the front end of a marine radar is sensitive to:
An anti-TR (ATR) tube is used to:
A thyratron in an older marine radar modulator is used as a:
The high-voltage DC supply for the magnetron is typically derived from:
Most modern shipboard marine radars use what type of antenna?
Fcc Ship Radar Endorsement Antennas
Increasing the horizontal length of a slotted-waveguide antenna at a fixed frequency will:
Approximate horizontal beamwidth of an X-band slotted waveguide antenna 1.8 meters long operating at 9.4 GHz is:
Vertical beamwidth of a marine radar antenna is intentionally made:
Antenna sidelobes are problematic because they may:
Polarization of a typical shipboard marine radar is:
A horizontal waveguide run between the transceiver and the scanner should be:
The standing-wave ratio (SWR) on a marine radar waveguide should ideally be:
The 'lobe' or beam pattern from a slotted-waveguide array is offset from broadside because:
Antenna gain is generally:
Typical antenna rotation rate for a shipboard navigation radar is:
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