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RF Repeater for Extended Radio Range: A Senior Project Presentation

Join us for the final presentation of the Union College Department of Electrical Engineering senior project, where Robin Stevenson (KC2OVQ) and Prof. James Hedrick showcase the design and construction of an RF repeater to enhance mobile radio coverage in the Schenectady, NY area. The project aims to serve as a platform for future student endeavors in radio frequency technology. Components like the Sinclair Technology MR354 Duplexer and Motorola D1017A Transceiver were utilized, with requirements including 1µV receiver sensitivity, 10W output power, and meeting FCC standards. Discover the project goals, challenges, improvements, and acknowledgment of contributors, including Professor Williams. Be part of the journey to achieve 9µV receiver sensitivity and 15W output power.

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RF Repeater for Extended Radio Range: A Senior Project Presentation

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  1. W2UC: Union College Amateur Radio Repeater Union College, Schenectady, NY Department of Electrical Engineering Senior Project Final Presentation Robin Stevenson (KC2OVQ) Project Advisor: Prof. James Hedrick

  2. What is a Repeater? ARRL

  3. W2UC Coverage

  4. Project Goals • Design and construct an RF repeater to extend the range of mobile radios in the area surrounding the campus • Ballston Lake • Provide a platform for future student projects involving radio frequency technology

  5. Amateur Radio

  6. Antenna Incoming FM Signal 447 MHz Transmitted FM Signal 442 MHz Signal Duplexer Power Line Control Line Receiver Transmitter Baseband Signal Controller Baseband Signal Push to Talk control Power Supply 12.5 V DC Repeater Block Diagram

  7. Components – Radio Frequency Sinclair Technology MR354 Duplexer Motorola D1017A Transceiver

  8. Components - Antenna

  9. Components – Control System Communications Specialists TS-64ds Cygnal 8051 microcontroller

  10. Control System - Detail Audio Mute Circuit TS-64ds HPF Audio Audio and Tone From Discriminator Output To Microphone Input Tone LPF Tone Detect To Microphone Push to Talk 8051 Microcontroller To 8051 From Tone Detect

  11. Requirements • 1µV receiver sensitivity at 12dB SINAD • 10W Output Power • FM Deviation ±5kHz • Frequency Accuracy ±.5 PPM • Meet all FCC requirements

  12. Measurement Devices Spectrum Analyzer RF Signal Generator SINAD meter Wattmeter Frequency Meter

  13. What’s Next? • Improvements • Data Communication

  14. Acknowledgements • Professor Hedrick • Jules Madey • Elroy Tatem • Gene Davison • Paul Tompkins • Mike Beatty • Professor Williams

  15. Final Results • .9µV receiver sensitivity at 12dB SINAD • 15W Output Power • FM Deviation ±5kHz • Frequency Accuracy ±.5 PPM

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