Radio Merit Badge Review Friday 6/21/13 7pm. Review of Radio Merit Badge (Al Ramsay – MB Counselor) Review Radio Merit Badge Workbook Q&A Agenda.

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Presentation transcript:

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

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

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 What are Radios?

1.Radio Licenses: Issued by the Federal Communication Commission (FCC) 2.License associated with Call Sign (ie. KPLU, KING5 etc) 3.‘K’ West of Mississippi River, ‘W’ East of Mississippi River 4.Identify Call Sign Hourly 5.Ham Call Signs W,K,N, A = USA VE = Canada XE = Mexico Then Number (ie ‘123’) Then Suffix (ie. ‘K2BSA = Scout Ham Radio) Radio Licenses

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

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

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

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