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.
Here are the Class designations from the Federal Motor Carrier Safety Administration: 1  Class A License - Any combination of vehicles with a GVWR of 26,001 or more pounds provided the GVWR of the vehicle(s) being towed is in excess of 10,000 pounds. Class B License - Any single vehicle with a GVWR of 26,001 or more pounds, or any such vehicle towing a vehicle not in excess of 10,000 pounds GVWR.