The term balun (pronounced bal-un) is derived from the function of the passive device that converts between a BAL anced and UNbalanced electrical signal. Common types of baluns convert 100 Ohm twisted pair (balanced) to 75 Ohm coaxial (unbalanced).
Commercial Driver License (Class A, B or C) A commercial driver license (CDL) is required for drivers of heavyweight vehicles, 26,001 lbs. or more gross vehicle weight rating (GVWR), vehicles hauling a trailer that is 10,001 lbs.
Class A, B and C are commercial licenses. Someone with a standard drivers license is not class C. No you do not need a Class C to obtain a class B or A. You need a standard drivers license, which is not commercial. Class A, B and C are nationwide. If you have one in one state, it is valid in another state.