In 1960, Frank Drake conducted the first search for radio signals from extraterrestrial civilizations at the National Radio Astronomy Observatory in Green Bank, West Virginia.

Radio signals could be amplified via regeneration to the point of human hearing without a headset.

For example, narrowband FM is used for two way radio systems such as Family Radio Service, in which the carrier is allowed to deviate only 2. 5 kHz above and below the center frequency with speech signals of no more than 3. 5 kHz bandwidth.

Radio signals broadcast from a single antenna will spread out in all directions, and likewise a single antenna will receive signals equally from all directions.

The latest trend is to send conventional LMR ( land-mobile-radio ) signals over the Internet ( Internet Protocol ) this is called RoIP ( Radio over Internet Protocol ), which is just like VoIP ( Voice over Internet Protocol ) but uses the radio.

Radio frequency ( RF ) is a rate of oscillation in the range of about 3 kHz to 300 GHz, which corresponds to the frequency of radio waves, and the alternating currents which carry radio signals.

Radio time signal watches are a type of electronic quartz watch which synchronizes ( time transfer ) its time with an external time source such as in atomic clocks, time signals from GPS navigation satellites, the German DCF77 signal in Europe, WWVB in the US, and others.

Radio telescopes may need to be extremely large in order to receive signals with high signal-to-noise ratio.

This 1984 Software Radio was a digital baseband receiver that provided programmable interference cancellation and demodulation for broadband signals, typically with thousands of adaptive filter taps, using multiple array processors accessing shared memory.

Radio frequency signals are down converted to the audio frequency band, which is sampled by a high performance audio frequency ADC.

* Radio Science Subsystem, on a scientific spacecraft uses radio signals to probe a medium such as a planetary atmosphere

* Radio Security Service, a British signals intelligence group during World War II

Radio remote control ( RF remote control ) is a way to control distance objects using a variety of radio signals transmitted by the remote control device.

In September 2002, the United States Federal Communications Commission approved the proprietary iBiquity in-band on-channel ( IBOC ) HD Radio system of digital audio broadcasting, which is meant to improve the audio quality of signals.

Radio signals in the VHF band ( 30 to 300 MHz ) can be distorted beyond recognition by a disturbed ionosphere.

Radio signals in the UHF band ( 300 MHz to 3 GHz ) will propagate through a disturbed ionosphere but a receiver may not be able to keep locked to the carrier frequency.

Plentywood is home to " Radio International ", with the combined signals of KATQ 1070 and KATQ-FM 100. 1.

Radio signals below 50 kHz are capable of penetrating ocean depths to approximately 200 metres, the longer the wavelength, the deeper.

Radio clocks synchronized to terrestrial time signals can usually achieve an accuracy of around 1 millisecond relative to the time standard, generally limited by uncertainties and variability in radio propagation.

Radio clocks depend on coded time signals from radio stations.

Radio waves are electromagnetic waves which carry signals through the air ( or through space ) at the speed of light with almost no transmission loss.

Radio transmitters and receivers are used to convey signals ( information ) in systems including broadcast ( audio ) radio, television, mobile telephones, wi-fi ( WLAN ) data networks, trunk lines and point-to-point communications links ( telephone, data networks ), satellite links, many remote controlled devices such as garage door openers, and wireless remote sensors, among many others.

Several attempts have been made to transmit signals to other stars as well, see " Realized projects " at Active SETI and Interstellar Radio Messages.

Radio observations of the moon have been made over the range of wave lengths from 4.3 mm to 75 cm, and the results are summarized in Table 1.

The guest assignments are scheduled for November 14 and 18, with the Orchestra Sinfonica Siciliana in Palermo and the Orchestra of Radio Cologne.

A year ago the Negro Radio Association was formed to spur research which the 30-odd member stations are sure will bring in more business.

Licenses for TV and radio broadcasters are issued by the Republican Commission on Television and Radio Broadcasting, the chair of which is the minister of information.

Radio and television regulation are regional competencies.

With domestic news, the correspondent first records a " generic minute " summary ( for use by all stations and channels ) and then priority is to report on BBC Radio 5 Live, then on the BBC News Channel and any other programmes that are on air.

The two companies are in partnership with American firms XM Satellite Radio and Sirius Satellite Radio respectively, and in accordance with the CRTC decision will only need to offer ten percent Canadian content.

" That same year, then-U. S. President Gerald Ford acknowledged the stature of the comic strip, telling the Radio and Television Correspondents ’ Association at their annual dinner, " There are only three major vehicles to keep us informed as to what is going on in Washington: the electronic media, the print media, and Doonesbury, not necessarily in that order.

There are also numerous community and special interest stations, including Dublin City FM ( 103. 2 MHz ), Dublin South FM ( 93. 9 MHz ), Liffey Sound FM ( 96. 4 MHz ), Near FM ( 90. 3 MHz ), Phoenix FM ( 92. 5 MHz ), Raidió na Life ( 106. 4 MHz ) and West Dublin Access Radio ( 96. 0 MHz ).

Radio DJs are less likely to focus on music-mixing procedures than club DJs, who rely on a smooth transition between songs using a range of techniques.

Radio waves thus have the most overtly " wave-like " characteristics of all the types of EMR, since their waves are so long.

All England matches are broadcast with full commentary on BBC Radio 5 Live.

There are currently radio broadcasts from China Radio International, Melbourne Ethnic Community Radio, Radio Habana Cuba, Radio Audizioni Italiane ( Rai ), Radio Polonia, Radio F. R. E. I.

Radio telescope s are often used by SETI projects

Radio technology and the ability to construct a radio telescope are presumed to be a natural advance for technological species, theoretically creating effects that might be detected over interstellar distances.

The selected baselines are two optional PHYs consisting of a UWB Pulse Radio ( operating in unlicensed UWB spectrum ) and a Chirp Spread Spectrum ( operating in unlicensed 2. 4 GHz spectrum ).

The ISM bands are defined by the ITU-R in 5. 138, 5. 150, and 5. 280 of the Radio Regulations.

Historic stations and huts on the island are Hoyberg, Vera, Olsbu, Puppebu ( cabin ), Gamlemetten or Gamlestasjonen ( the old weather station ), Jan Mayen Radio, Helenehytta, Margarethhytta, and Ulla ( a cabin at the foot of the Beerenberg ).

One FM station, which shifts between French, English, and Armenian, and the sole AM radio station, which broadcasts solely in Arabic, are owned by the state-owned Radio Lebanon, which is under the jurisdiction of the Ministry of Information.