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.
Vehicle weight determines the class of a Commercial Drivers License. There are three class categories: A, B, and c. For the Class B CDL Test, candidates must take the General Knowledge test (which are required for all CDL licenses) plus any additional endorsement tests needed for the Class B CDL License.