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.
Obtaining a class B commercial driver's license isn't much different than getting an ordinary license in that there is a written test and a road test. There are three different types of commercial driver licenses that you can obtain, and you should make sure that a class B is indeed the type of license you need. class B license is for any combination of vehicles with a gross vehicle weight rating (GVWR) of 26,001 or more pounds, or any such vehicle towing a vehicle not in excess of 10,000 pounds. If this doesn't sound like what you are looking for, you may be looking for a class A license.