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.
The difference between a Class A and Class B commercial driverâs license is a Class B CDL allows the driver to operate any heavy straight vehicle with a gross vehicle weight rating greater than 26,000 pounds, as well as any vehicle towing another vehicle not in excess of 10,000 pounds.