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Emergency Response Radio

Emergency Response Radio. Ashok Basawapatna Joe Friedrichsen Chris Lasek Jeff Ritter. Purpose. A radio that alerts users to emergency broadcasts Constantly monitors specified frequency Broadcasts emergency message when the Emergency Alert System is activated

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Emergency Response Radio

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  1. Emergency Response Radio Ashok Basawapatna Joe Friedrichsen Chris Lasek Jeff Ritter

  2. Purpose • A radio that alerts users to emergency broadcasts • Constantly monitors specified frequency • Broadcasts emergency message when the Emergency Alert System is activated • Otherwise behaves as normal radio

  3. Design Objectives • Radio Block • Receiver antenna • Isolation & Demodulator circuits • Control Block • Signal detection • Combinational logic • Voltage and Power regulation • Amplifier Block

  4. Functionality - Appearance 1 2 3 4 5 6 10 9 8 7 1. Emergency Radio Tuner Indicator 6. Power Button 2. Emergency Radio Band Selector 7. Volume Knob 3. Emergency Radio Tuner Knob 8. Standard Radio Tuner Knob 4. Emergency Radio Manual Override Button 9. Standard Radio Band Selector 5. Manual Override Light 10. Standard Radio Tuner Indicator

  5. Radio Power Conditioning Control Amplifier Functionality – Components

  6. Radio Radio Block Radio Signal Power Antenna Radio Signal Demodulator Tuner Power

  7. Receiver Antenna Receive radio signals Isolation Circuit Sets radio to desired frequency Tunable band-pass filter Tank circuit & other peripheral circuitry Demodulator Circuit Separate voice from carrier signal Scheme? Synchronous vs. Asynchronous Digital vs. Analog Radio Block

  8. Control Control Block Power Power to ERR Power to Standard ERR Radio Signal Power to Amplifier Standard Radio Signal Chosen Radio Signal User Input Power Tone Recognition ERR Radio Signal EAS Tone Matched? Power Logic User Input On/Off/ Override Emergency! Power to ERR Power Digital Switches Power to Standard Radio Standard Radio Signal Power to Amplifier ERR Radio Signal Chosen Radio Signal

  9. Control Block • Detect emergency broadcast • DSP vs. ASICs vs. Analog Notch filters • Combinational logic • Determine which tuner becomes amplified • Override button • Power allocation • Voltage Regulation • DC-DC Converters • Buck & Boost converters • Voltage regulator chips

  10. Amplifier Block • Amplify signal going to the speakers • Op-Amps vs. Transistors • Volume control

  11. Division of Labor • Isolation Circuit & Demodulator • Chris and Jeff • Control block • Ashok and Joe • Voltage regulation & Amplifier • Entire group • Documentation • Entire group

  12. Schedule

  13. Risks & Contingency Plans • Learning to use DSP and ASIC chips • Use analog notch filters • Control block responding to incorrect signal • Build higher order filter / Use additional filters • Use different chip • Use of OP-AMP amplifier questionable • Use BJT or MOSFET transistors • Other amplifier ASICs

  14. Marketability • Could benefit a broad audience • Many listen to the radio • Affordable to all levels of income • Applicable to many areas • Could be adapted to car and portable radios

  15. Cost Analysis Return on Investment • Estimated Cost: • Prototype: $250 • Components: $15 • Time: 800 man-hours ($25/hr = $20,000) • Sale Price • $25 • Payback • Sell 810 units before making profit.

  16. Additions & Extensions • Adapt to car and home stereos • Design portable version • Extend to control TV • Peripheral device compatible with old radios

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