At EuCAP 2025, in Stockholm, as a celebration of #100yearsofcommunication, we are invited to give a Scientific Workshop for the participants at the 19th edition of the European Conference on Antennas and Propagation (EuCAP). Robert Petterson and Fredrik Wiklund, from Alexander Grimeton Friendship Association will present:
The 1924 2.2 km electrically small Grimeton VLF antenn
Abstract
Presentation of the VLF high power transmitter at Grimeton, Varberg. The multiple tuned antenna system fed via the high frequency transformers from the alternator (generator) is presented and discussed. The 2.2 km long and 127m high, electrically small, multiple tuned antenna system was devised by Ernst Alexanderson. The equivalent schematic is shown in a simplified way leading to a better understanding of the antenna. The VLF signal needs to be modulated in some way to be able to convey any information. The modulation of the signal is carried out by a ”magnetic amplifier” also devised by E. Alexanderson. The connection between the ”magnetic amplifier” and the the high frequency transformer is described and is planned to be supported by measurements
Workshop outline
- Presentation of the 100 year old system, with additional modern measurements.
- Discussion around some of the functionality, where we do not have a complete understanding.
- How was the inventor thinking when designing some of the integrated components?
Arrangör
