Experiment 8 - trend of a triangular wave I would also...

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Experiment 8 Signatures of Radio Signals Ryan Beasley 12-1-09 Calibration Completed 12-1-09 Signal From Real Time Spectrum Analyzer (Linear Scale):
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Signal From Real Time Spectrum Analyzer (dBm Scale): Judging by the input of the signal I believe that it is a square-wave with a 33%duty cycle. The fundamental frequency is 100kHz and in the frequency spectrum there was 100kHz component, 200kHz components, 400 kHz, 500kHz, 700kHz, 800kHz and so on. There are null points at 300kHz, 600kHz, and so on. This is why I believe it has a 33% duty cycle. This trend was still seen even after the second null point. Each signal is decreasing on somewhat of the same scale and does not have the decreasing
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Unformatted text preview: trend of a triangular wave. I would also assume that the signal would have some type of DC offset so that the spectrum analyzer would not be damaged. When I zoomed into the signal at 100kHz I could not see any other components to the right or left of the signal, so I do not believe that and modulation is occurring. I did not see anything at the 200kHz signal as well. Also I believe the scope was having problems because the positive spectrum should be a mirror of the negative spectrum, but there were balancing issues. This caused a problem when I tried to derive the amplitude of the signal. I decided to measure the middle of the two sides....
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This note was uploaded on 11/24/2010 for the course ECE 405Lec taught by Professor Cockrum during the Fall '09 term at Cal Poly Pomona.

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Experiment 8 - trend of a triangular wave I would also...

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