May 11, 2014

FCC Technician Exam Question Of The Day (T7C11)

Q) What is a disadvantage of "air core" coaxial cable when compared to foam or solid dielectric types?

A) It requires special techniques to prevent water absorption

NJ2X Notes:
A coaxial design in which a monofilament of plastic holds the center conductor in place in a hollow plastic tube allowing the remainder of the dielectric to be air. Typical velocities of up to 84% can be achieved in this design.

RG-59 air core coaxial cable