Receiving antenna building » History » Version 5
Version 4 (SCHNEIDER, Joris, 03/23/2017 10:14 PM) → Version 5/62 (SCHNEIDER, Joris, 03/23/2017 10:26 PM)
h1. Receiving antenna building
h2. List of components
h2. Assembly
h2. Testing and validation
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.
p=.
!{width:60%}PhaseShift2.jpg!
!{width:60%}PhaseShift.jpg!
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.
h2. Validation
Once all this test were done, the antenna was put on the roof in order to be able to get APT signals.
h2. List of components
h2. Assembly
h2. Testing and validation
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.
p=.
!{width:60%}PhaseShift2.jpg!
!{width:60%}PhaseShift.jpg!
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.
h2. Validation
Once all this test were done, the antenna was put on the roof in order to be able to get APT signals.