His best known developments include the radio measuring devices with the code names Freya, Aquarius and Jagdschloß.
After one year of practical work at the Röchling factories, he studied electrical engineering at the Technical University of Darmstadt from 1921 to 1926.
As early as June 1934, he moved to the newly founded Society for Electro-Acoustic and Mechanical Apparatus (GEMA) to take over the management of the research laboratory.
[2] In 1937, after further extensive tests, Schultes developed the Freya radio measuring device .
It worked with a wavelength of 240 centimeters, was portable and intended for the detection of flight destinations.