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.
Find out how to get a commercial driverâs license below. Types of Commercial Driverâs Licenses. There are three main types of commercial driverâs licenses: Class A, Class B and Class C. In most states a Class A CDL allows the driver to operate any vehicle with a semi-trailer or trailer with two or more axles.