This paper shows the results obtained when applying a learning strategy by using a free software, specifically Scilab, in the subjects of communication systems in the 8th and 9th semesters in the electronics degree program, of the technology department at the Universidad Pedagogica Nacional during the second term in 2007 and the first term in 2008. The implemented product is a didactic support handbook that includes the thematics that are developed in this field with a special profile and allows, with a direction to teachers and students, the creation of learning environments in the area of communication systems.