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Radio is the wireless transmission of signals, by modulation of electromagnetic waves with frequencies below those of light.
Radio waves
Radio waves are a form of electromagnetic radiation, created whenever a charged object (in normal radio transmission, an electron) accelerates with a frequency that lies in the radio frequency (RF) portion of the electromagnetic spectrum. In radio, this acceleration is caused by an alternating current in an antenna. Radio frequencies occupy the range from a few tens of hertz to a few hundred gigahertz.
| ELF - SLF - ULF/VF - VLF - LF/LW - MW - HF/SW - VHF - UHF - SHF - EHF Electromagnetic radio spectrum |
Electromagnetic spectrum and diagram of radio transmission of an audio signal.
Electromagnetic radiation travels (propagates) by means of oscillating electromagnetic fields that pass through the air and the vacuum of space equally well, and does not require a medium of transport (such as the aether). When radio waves pass an electrical conductor, the oscillating electric or magnetic field (depending on the shape of the conductor) induces an alternating current and voltage in the conductor. This can be transformed into audio or other signals that carry information. The word 'radio' is used to describe this phenomenon, and television, radio, radar, and cell phone transmissions are all classed as radio frequency emissions.
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Radio :: Arts
Amateur and CB Radio :: Equipment
Two Way Radio :: Telecommunications
Radio :: Antiques
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Packet Cluster Software
The DXZone.comSoftware to run ham radio packet cluster software for windows and linux
OZ3QY CDG2000 Transceiver
The DXZone.comTechnical Reference/HF RadiosThe CDG2000 is a high performance HF transceiver developed by G3KBB, G3OCQ and G3SBI. They have managed to design a high end transceiver that can compete with the most expensive ones on the market
I0SKK CDG2000 transceiver
The DXZone.comTechnical Reference/HF RadiosCDG2000 is a superb transceiver, mainly designed as a high performance receiver by three G-land OM Colin Horrabin G3SBI; Dave Roberts G8KBB and George Faer G3OGQ.
Return Loss, SWR, Power Gain and Loss Calculator
The DXZone.comTechnical Reference/ElectronicsA neat tool for your daily ham activities around the shack
VFO Sync board for Yaesu FT1000MP
The DXZone.comRadio Equipment/HF Transceivers/Yaesu FT-1000MPVFO Sync board for Yaesu FT1000MP Mark V Field, Enhance your listening experience with help of a small stealth control board
80-40-20 Meter Dipole antenna
The DXZone.comAntennas/DipoleMultiband dipoles capable of operating on 80 through 6 meters band with a tuner by KJ4EX
The Stream Center - The Stream Center for your Pocket PC or PDA. US radio stations webcasting on RealOne Player, Windows Media Player, Streaming mp3 and Other formats listed by US state.
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