Experiment 7

Experiment 7 - E xperiment 7: Frequency Modulation Lab...

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Experiment 7: Frequency Modulation Lab Report By Joe Doyle For Prof. Dick, JEE3310 Lab Partners: Ryan Mason Nate Dalton

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Seth Bartnik Part 1: Frequency Modulation 1A) mf=.25 for the frequency deviation of 125Hz. Referring to the table of Bessel Functions, we see that J0=.9844, J1=.124, and J2=.0078. The rest of the values are 0. The highest peak is our carrier which is 30kHz. It is clear that we can see J0 and J1 agree with the table. The rest of the values are too small to read, which is what is expected. mf=2.4 for the 1200Hz frequency deviation. The table shows J0=.0025, J1=.5202, J2=.4310, J3=.1981, and the rest are small enough to neglect. It is clear that the center peak is the carrier. J0 does not exist, and J1 appears to agree with the table. I would expect to see a visible peak for J2 but it is not there. Otherwise our collected data agrees with the table. F=125Hz F=1200Hz
1B) The following scope captures of the FFT are the sine, square, and triangle waves @ mf=8. The sine and triangle waves are suprisingly very similar. The square wave capture

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This document was uploaded on 12/03/2009.

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Experiment 7 - E xperiment 7: Frequency Modulation Lab...

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