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.
A driver with a Class A license may, with the proper endorsements, operate vehicles requiring a Class B, C, or D license. Class B: Single vehicles with a GVWR of 26,001 lbs. or more, or any such vehicle towing a vehicle 10,000 lbs.