Receiving antenna building¶

List of components¶

Assembly¶

Testing¶

In order to ensure the fact that the antenna is functioning well, we made several tests.

At first, we had to ensure that the cables will really bring the phase shift of a Pi/2 between opposite dipoles. To do so, we plugged in the cables to a signal generator. We generated a sine signal at 137MHz and observed on an oscilloscope the signal at the output of two cables which have a different length as explained in the design part. Here you can find pictures of the signal generator and the observed signal at the ouput.

We see that the phase shift between the two cables is about Pi/2.

Then, at each step during the assembly, we tested each connection with a multimeter in order to ensure that all connections are correctly done.

Validation¶

Once all this test were done, the antenna was put on the roof in order to be able to get APT signals.