Understanding the Frequency Spectrum
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Transcript of Understanding the Frequency Spectrum
Understanding the Frequency Spectrum
Finding Your Place
Common Frequency Bands
▪AM radio - 535 kilohertz to 1.7 megahertz
Common Frequency Bands
▪AM radio - 535 kilohertz to 1.7 megahertz
▪Short wave radio - 5.9 mhz to 26.1 mhz
Common Frequency Bands
▪AM radio - 535 kilohertz to 1.7 megahertz
▪Short wave radio - 5.9 mhz to 26.1 mhz
▪C.B. radio - 26.96 - 27.41 mhz
Common Frequency Bands
▪AM radio - 535 kilohertz to 1.7 megahertz
▪Short wave radio - 5.9 mhz to 26.1 mhz
▪C.B. radio - 26.96 - 27.41 mhz
▪Television stations - 54 to 88 mhz - chls 2-6
Common Frequency Bands
▪AM radio - 535 kilohertz to 1.7 megahertz
▪Short wave radio - 5.9 mhz to 26.1 mhz
▪C.B. radio - 26.96 - 27.41 mhz
▪Television stations - 54 to 88 mhz - chls 2-6
▪FM radio - 88 mhz to 108 mhz
Common Frequency Bands
▪AM radio - 535 kilohertz to 1.7 megahertz
▪Short wave radio - 5.9 mhz to 26.1 mhz
▪C.B. radio - 26.96 - 27.41 mhz
▪Television stations - 54 to 88 mhz - chls 2-6
▪FM radio - 88 mhz to 108 mhz
▪Television stations - 174 to 220 mhz (7-13).
▪Every Wireless device has its own Band
▪Garage door openers - 40 mhz
▪Baby monitors: 49 mhz
▪Radio controlled airplanes: Around 72 mhz
▪Cell phones: 824 to 849 megahertz
▪Cordless phones: 900 mhz,
▪Air traffic control: 960 mhz to 1.2 Ghz
▪GPS System: 1.2 – 1.5 Ghz.
▪Cordless Phones: 2.4 Ghz.
Interference
How are frequencies decided?
▪Generally first come first served
How are frequencies decided?
▪Generally first come first served
▪AM Radio was first on the block
How are frequencies decided?
▪Generally first come first served
▪AM Radio was first on the block
▪Arrived in 1906 - limited frequencies (low)
How are frequencies decided?
▪Generally first come first served
▪AM Radio was first on the block
▪Arrived in 1906 - limited frequencies (low)
▪FM Radio came along before TV.....
How are frequencies decided?
▪Generally first come first served
▪AM Radio was first on the block
▪Arrived in 1906 - limited frequencies (low)
▪FM Radio came along before TV.....
▪BUT ...TV became popular faster.
Signal Reach
▪Short Wave radio can circle the globe.
Signal Reach
▪Short Wave radio can circle the globe.
▪Some AM stations can travel great distances
▪Why?
Signal Reach
▪Short Wave radio can circle the globe.
▪Some AM stations can travel great distances
▪Why?
▪Part of Atmosphere is called IONOSPHERE.
Signal Reach
▪Short Wave radio can circle the globe.
▪Some AM stations can travel great distances
▪Part of Atmosphere is called IONOSPHERE
▪Sun causes atoms to lose electrons and become ions
Signal Reach
▪Short Wave radio can circle the globe.
▪Some AM stations can travel great distances
▪Part of Atmosphere is called IONOSPHERE
▪Sun causes atoms to lose electrons and become ions
▪The ionosphere can reflect certain radio waves.
Signal Reach
▪Short Wave radio can circle the globe.
▪Some AM stations can travel great distances
▪Part of Atmosphere is called IONOSPHERE
▪Sun causes atoms to lose electrons and become ions
▪The ionosphere can reflect certain radio waves.
▪When the sun disappears….the layer becomes transparent.
Assignment
• Choose 3 Windsor Radio Stations. Identify:- Frequency (ie: 95.9 FM, 1290AM…)- Ownership (ie: CORUS, CHUM…)- Format (Rock, Country, Alternative…)
• For each Frequency, locate 3 other Radio stations that share the same Frequency.- Research the following:Frequency, Location, Owners, Format
Example- The River -
Frequency – FM 93.9• Ownership – Bell Media• Format – Alternative
____________________________________• Other Stations:
103.9 CISN 103.9 K-RockEdmonton NewFoundlandCORUS Radio ASTRAL MediaCountry Classic Rock