K1JT is the call sign of Joe Taylor, an American physicist and amateur radio operator known for his contributions to digital communication in ham radio. He developed several popular software programs, including WSJT, which is widely used for weak signal communication. The WSJT software suite includes modes like FT8 and JT65, allowing operators to communicate over long distances using minimal power. These modes are particularly effective for making contacts under challenging conditions, such as during solar minimum or in noisy environments.