When I started that is what people used. That what people would tell you to use. The balun kits at the time contained a T200-2 (powered iron core) with enough wire and instructions to wind a trifilar 1:1. So using a 1:1 voltage balun was it. Then from that when I wanted a 4:1 it was still voltage balun because it was what pushed as the type of balun to use. At the moment the 2 baluns I am the happiest with are the 1:1 current balun currently on the inside end of my ladder line and a 2 core current balun for the rare times 4:1 is the ratio I need.