Receiving antenna building » History » Version 5

SCHNEIDER, Joris, 03/23/2017 10:26 PM

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h1. Receiving antenna building
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h2. List of components
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h2. Assembly
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h2. Testing
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In order to ensure the fact that the antenna is functioning well, we made several tests.
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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.
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p=. 
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!{width:60%}PhaseShift2.jpg!
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!{width:60%}PhaseShift.jpg!
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We see that the phase shift between the two cables is about Pi/2.
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Then, at each step during the assembly, we tested each connection with a multimeter in order to ensure that all connections are correctly done.
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h2. Validation
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Once all this test were done, the antenna was put on the roof in order to be able to get APT signals.