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Radio Merit Badge Review Friday 6/21/13 7pm

Radio Merit Badge Review Friday 6/21/13 7pm. Agenda. Review of Radio Merit Badge (Al Ramsay – MB Counselor) Review Radio Merit Badge Workbook Q&A. What are Radios?. In England, radio called “wireless”

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Radio Merit Badge Review Friday 6/21/13 7pm

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  1. Radio Merit Badge Review Friday 6/21/13 7pm

  2. Agenda • Review of Radio Merit Badge (Al Ramsay – MB Counselor) • Review Radio Merit Badge Workbook • Q&A

  3. What are Radios? • In England, radio called “wireless” • Use of Electrical Waves to send / receive information • Both Near (Remote Door Lock) and Far (Satellite TV) • Other definitions: • Broadcasting – send information via radio to lots of people (AM/FM Radio, Television). Transmission to many receivers but receivers don’t reply • Hobby Radio – Ham Radio (two way), CBs, RC Model Aircraft / Boats

  4. Radio Licenses • Radio Licenses: Issued by the Federal Communication Commission (FCC) • License associated with Call Sign (ie. KPLU, KING5 etc) • ‘K’ West of Mississippi River, ‘W’ East of Mississippi River • Identify Call Sign Hourly • Ham Call Signs • W,K,N, A = USA • VE = Canada • XE = Mexico • Then Number (ie ‘123’) • Then Suffix (ie. ‘K2BSA = Scout Ham Radio)

  5. Phonetic Alphabet / Morse Code • Word Stands for Letter (ie. Alpha – A, Bravo – B) • Name Ted: Tango, Echo, Delta • Morse Code: Combination Dashes / Dits

  6. How Radio Waves Travel • Uses AC Current. Standard House 60Hz (cycles per second) • When AC gets to 10K Hz, AC becomes radio frequency (RF) • Signal leaves the wire, becomes VHF / UHF (line of sight) • Bounces off sky / ionosphere • Bands – groups of frequencies • AM: Ground Wave Propagation: (535kHz to 1605 kHz) • During day Ionosphere thick / absorbs AM • During night Ionosphere thin / reflects AM • AM: 535 – 1605 kHz • Shortwave: 3-30 MHz • FM: 88 to 108 MHz

  7. How Radio Waves Travel • Uses AC Current. Standard House 60Hz (cycles per second) • When AC gets to 10K Hz, AC becomes radio frequency (RF) • Signal leaves the wire, becomes VHF / UHF (line of sight) • Bounces off sky / ionosphere • Bands – groups of frequencies • AM: Ground Wave Propagation: (535kHz to 1605 kHz) • During day Ionosphere thick / absorbs AM • During night Ionosphere thin / reflects AM • AM: 535 – 1605 kHz • Shortwave: 3-30 MHz • FM: 88 to 108 MHz

  8. How Radio Waves Carry Information • Morse Code – Dit / Dahs Recognizable Patterns (A=ditdah) • Modulation – combine audio with continuous radio signal • Amplitude Modulation – AM • Frequency Modulation – FM • Television – Combination AM (Picture) / FM (Sound)

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