antenna and measurements

We built a little circuit to detect cellphone activity. Afterwards we wanted to check the distance that the cellphone should be from the antenna to be detectable with different resistance values. We figure out many things: that it does not work good on the top floor and that are many variables that can influence on the wave. However, we are satisfied with the range our little circuit provide (about 80 cm).

In the afternoon we had a meeting with researchers from the "Conservatoire National de Arts et Métiers" (CNAM). They study hardcore telecommunications signal treatment. Maybe we will come up with a future collaboration.