Key Topic 49: Installation Flashcards
8-49F1: Why is coaxial cable often used for S-band installations instead of a waveguide?
A. Losses can be kept reasonable at S-band frequencies and the installation cost is lower.
B. A waveguide will not support the power density required for modern S-band RADAR transmitters.
C. S-band waveguide flanges show too much leakage and are unsafe for use near personnel.
D. Dimensions for S-band waveguide do not permit a rugged enough installation for use by ships at sea.
A. Losses can be kept reasonable at S-band frequencies and the installation cost is lower.
8-49F2: RADAR interference to a communications receiver is eliminated by:
A. Not operating other devices when RADAR is in use.
B. Properly grounding, bonding, and shielding all units.
C. Using a high pass filter on the power line.
D. Using a link coupling.
B. Properly grounding, bonding, and shielding all units.
8-49F3: Why should long horizontal runs of waveguide be avoided?
A. They must be insulated to prevent electric shock.
B. To prevent damage from shipboard personnel.
C. To minimize reception of horizontally polarized returns.
D. To prevent accumulation of condensation.
D. To prevent accumulation of condensation.
8-49F4: Long horizontal sections of waveguides are not desirable because:
A. Moisture can accumulate in the waveguide.
B. The waveguide can sag, causing loss of signal.
C. Excessive standing waves can occur.
D. The polarization of the signal might shift.
A. Moisture can accumulate in the waveguide.
8-49F5: In a RADAR system, waveguides should be installed:
A. Slightly bent for maximum gain.
B. As straight as possible to reduce distortion.
C. At 90 degree angles to improve resonance.
D. As long as possible for system flexibility.
B. As straight as possible to reduce distortion.
8-49F6: What is the most important factor to consider in locating the antenna?
A. Allow the shortest cable/waveguide run.
B. Maximum height for best long range operation.
C. The antenna is in a location that is not shadowed by other structures.
D. Easy access for maintenance.
C. The antenna is in a location that is not shadowed by other structures.
