The semi-anechoic room (built by Keene Ray Proof, Euroshield) was installed at the end of the nineteenth century; later a pre-room was installed to host measurement tools and a console for controlling and monitoring the tests. The two rooms are joined through a cable bulkhead.
The main characteristics of the semi-anechoic room are:
In the picture below there is the characterization
of the room in terms of attenuation depending of the frequency.
Characterization of the semi-anechoic room