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سؤال 291

Why should the outer jacket of coaxial cable be resistant to ultraviolet light?

  1. Ultraviolet light can increase the resistance of the conductors
  2. Ultraviolet light can increase losses in the cable’s jacket
  3. Ultraviolet and RF signals can mix, causing interference
  4. Ultraviolet light can damage the jacket and allow water to enter the cableپاسخ درست

توضیح

Sunlight breaks down unprotected plastics over time, cracking the outer jacket, and once the jacket is breached water reaches the shield and dielectric and ruins the cable. The jacket is not part of the RF path, so the choices about jacket loss or RF mixing describe mechanisms that do not exist.

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شروع تمرین
سؤال 291: Why should the outer jacket of coaxial cable be resistant… · FCC Technician Class (Element 2) · Questena