About Sound and Vision's collection of a radio pioneer
It's 1940, and the Netherlands are occupied by the Germans. Owning a working radio device is illegal. Therefore, the Postal Museum assumes that the German Wehrmacht has been informed and it is true that the radios are not sealed or having to be returned. It could just be that Idzerda wanted to prevent losing the radios during the occupation, by making this donation.
A loop antenna is, in principle, a self-inductance which is a coil. Together with a capacity a tuned circuit is formed. Connection with a receiver makes radio reception possible. The power depends on the dimensions of the window, but is generally considerably smaller than that of a wire antenna. A loop antenna requires a sensitive receiver. Loop antennas were initially used by multiple high-frequency amplifiers. This antenna is used for experiments and therefore no longer in its original state.
Sound and Vision's collection of Idzerda objects, originates from the donations to the Postal museum (by way of the Museum for Communication, which in turn inherited it from the Postal museum) and the Broadcasting Museum. Since then, radio amateurs and collectors like the Dutch Association for Radio Telegraphy (NVVR) and individuals such as broadcasting historian N.T.J. Swierstra also added donations to the Idzerda collection, making it unique in its depth and scope.
Production: Carlien Booij, Erik van Tuijn
Research: Pieter Bakker, Carlien Booij, Erik van Tuijn
Art direction: Ruben Steeman, buro RuSt
Camera and video editing: Elmar Kroezen, Videofabrique
Animations: Kirsten Sschuil, Ruben Steeman
With special thanks to: Tobias Idzerda, grandson of Hans Idzerda, Pieter Bakker and everyone involved at Sound and Vision