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 Class C license is for the operation of a single vehicle or combination of vehicles that does not meet the definition of a Class A or Class B license. A Class A or Class B license, or a Class C license with endorsements for double or triple trailers, buses, tank trucks, or hazardous materials is a commercial license. Operation of a school bus, motorcycle, motor-drive cycle, or moped requires a special endorsement on a license.