International Radiotelegraph Convention (1912)
The International Radiotelegraph Convention (1912) established international callsigns, replacing the three letter callsigns prevalent then. Major world powers were given single prefixes such as N/K/W (United States), A (Germany), F (France), B (Great Britain). British colonies were given the call signs starting with V. The convention was signed at the International Radiotelegraph Conference in London on July 5, 1912.
- itu.int. International Telecommunication Union http://www.itu.int/en/history/Pages/RadioConferences.aspx?conf=37&dms=S0201000012. Missing or empty