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