The Research Laboratories continued with the development of new transmitters that could operate at shorter wavelengths and could be re-tuned for broadcasts to different parts of the world. By the end of 1936, the power had been raised by connecting a stage with two water-cooled type TA 20/250 valves. This provided a power output of 60 kW at a frequency of 15220 kHz and immediately became the strongest short-wave transmitter in Europe. In 1937, this transmitter was moved from Eindhoven to the PHOHI Transmitter Park in Huizen.