Variable Low Power FM Transmitter for use with Convenient Sound Player.

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Variable Low Power FM Transmitter for utilization with Portable Audio Player. Correspondence Electronics Dr. Pao-Lo Liu. TA Mr. Saurav Bandyopadhyay. Jason Burgess ...
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Variable Low Power FM Transmitter for use with Portable Audio Player Communication Electronics – Dr. Pao-Lo Liu TA – Mr. Saurav Bandyopadhyay Jason Burgess Kee Soon Lim Terry Hudson

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Objectives & Goals The gadget will work as a versatile remote FM transmitter with a contribution from the smaller than usual jack of a compact sound gadget. The gadget will hold fast to Title 47 of the Code of Federal Regulations (Part 15, subpart C), which expresses, "as far as possible for unlicensed FM transmissions is a sign quality of 250 microvolts for each meter, measured 3 meters from the transmitting reception apparatus"

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Design Specifications Transmitter\'s recurrence range: 88-107Mhz Effective Transmitter separation: 2-5 meters Frequency Response: 10khz Easily Portable Variable Transmitted Frequency

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Final Design Fig 1. The schematic of the last outline.

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Bread boarded Circuit The Pre-accentuation circuit The speaker circuit The oscillator circuit Fig 2. Photo of the bread boarded circuit.

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Operation and Analysis *The examination was led with utilization of a Clarion DXZ735MP recipient, the specs are recorded beneath. FM recurrence reaction 30-15kHz +0.0, - 2.1 dB SNR 74.4 dB mono, 71.2dB stereo All estimations taken at 89.1 MHz bearer recurrence.

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Operation and Analysis Fig 3. Yield at 100 Hz Fig 4. Yield at 30 Hz

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SNR To quantify the SNR a sound examination document was obtained of a 1kHz sine wave. The crest to crest voltage of a 1kHz sine wave was measured against the no sign clamor level at various volumes of the info. Fig 5. SNR information SNR=20 log (Vs/Vn)

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Effective Transmitter Distance The same 1kHz sine wave was utilized as the information. The yield was measure by the recipient with three foot whip recieving wire connected. A basic 18 in. long 20 gage wire was utilized as the transmitter recieving wire. The powerful transmission separation was resolved to be the straight line, radio wire to reception apparatus separation at which a lessening of 3dB happened. The lab estimation was 6.4m (21 feet)

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Frequency Response Figure 6-The yield from the transmitter with the pre-accentuation. The –3 dB focuses are 85Hz, 14.5 kHz. The data transfer capacity is then 14kHz. Fig 6. Figure 7-The yield from the transmitter without the pre-accentuation. The –3 dB focuses are 80 Hz, 9.3 kHz. The data transfer capacity is then 9.2 kHz. Fig 7.

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Possible Improvements Soldering to a printed circuit board Making utilization of a superior recieving wire Indicating transmission recurrence on dial Indicating transmission recurrence utilizing 7 fragment LED shows.

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Time Line

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Thank You Any Questions? REFERENCES [1] [2] Electronic Communications Systems fifth ed. , Tomasi, Wayne, Prentice Hall, 2003