A Look At The Radio Spectrum

A Look at the Radio Spectrum THERE ARE 7 TYPES OF ELECTROMAGNETIC RADIATION... MICROWAVES INFRARED RADIO WAVES VISIBLE ULTRAVIOLET .. BUT WE'RE HERE TO TALK ABOUT THE RADIO PORTION OF THE EM SPECTRUM. X-RAY Radio waves have frequencies that range from 3 kHz to 300 GHz. GAMMA FREQUENCY ALLOCATION VARIES FROM COUNTRY TO COUNTRY. THE SPECTRUM WE USE MOST OFTEN IN THE UNITED STATES: VERY HIGH FREQUENCY (30-300 MHz): FM radio, MEDIUM HIGH ULTRA HIGH FREQUENCY (300-3000 kHz): AM radio, FREQUENCY (3-30 MHz): CB radio, short- FREQUENCY (300-3000 MHz): Television, microwave ovens, mobile phones, amateur radio wave broad- television, weather radio wireless LAN, Bluetooth, casts, RFID GPS Much of the The Federal Communications Commission, the U.S. agency that regulates spectrum usage, has conducted 87 spectrum auctions since July 1994. These auctions have generated over $60 billion. usable spectrum in the United States is 60B+ sold through spectrum auctions. THERE ARE TWO TYPES OF CELL PHONE NETWORKS IN THE UNITED STATES: GSM AND CDMA Cell phones using CDMA operate at 850/1900Mhz frequencies. The carriers that use CDMA include Verizon, Cell phones using GSM technol- ogy operate at 850 MHz and 1900 MHz. The carriers that use GSM include AT&T, T-Mobile, Sprint, Virgin, Boost, and Alltel. Suncom, and Pure. A tin-foil hat can actually partially block radio waves above 20 kHz, but only if it's well constructed. Radio-controlled Incorrectly made, a tin-foil toys operate at either 27 MHz hat can amplify radio waves. or 49 MHz. INPUT OUTPUT OD SOURCES: Wikipedia, Gizmodo and howstuffworks.com TEXT: Carol Pinchesky DESIGN: David Foster INPUTCREATESOUTPUT.COM