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St Louis County, Missouri MO Scanner Frequencies and Radio Frequency Reference

In 1895, Guglielmo Marconi developed a radio wave based communication system, demonstrating that morse code signals could be sent over long-distances and, by December 1901, across the Atlantic ocean. On November 2, 1920, the first commercial radio broadcast was transmitted by Westinghouse Electric and Manufacturing Company in Pittsburgh, under the call sign KDKA featuring live coverage of the Harding-Cox presidential election. Synthetic aperture radar – a specialized airborne radar set that produces a high-resolution map of ground terrain. The radar is mounted on an aircraft or spacecraft and the radar antenna radiates a beam of radio waves sideways at right angles to the direction of motion, toward the ground. In processing the return radar signal, the motion of the vehicle is used to simulate a large antenna, giving the radar a higher resolution. The program of the vast majority of broadcasters is offered free of charge.

Radio waves in this band travel by line-of-sight so FM reception is limited by the visual horizon to about 30–40 mi (48–64 km), and can be blocked by hills. However it is less susceptible to interference from radio noise , and has higher fidelity, better frequency response, and less audio distortion than AM. Web radio or internet radio is a radio program that offers you an internet-based service. You can listen to this service online via a stream, for example on your computer or smartphone.

Cordless phone – a landline telephone in which the handset is portable and communicates with the rest of the phone by a short-range full duplex radio link, instead of being attached by a cord. Both the handset and the base station have low-power radio transceivers that handle the short-range bidirectional radio link. As of 2022, cordless phones in most nations use the DECT transmission standard. Listen to radio stations from St. Louis MO, from a wide variety of genres like Adult Contemporary, News, Pop, RnB and Talk. Enjoy stations such as Jubilee KSTL, Boom Boom Room Burlesque Radio, St. Louis Public Radio - KWMU, The Big KTRS, WEW 770 AM - WEW and more. Listen on your iPhone, iPad, iPod Touch, Android, Blackberry, and other app-enabled mobile phones.

The device has to be connected to the internet and then offers a large selection of programs. It can become problematic when the integrated database is no longer supplied with updates. For receiving radio stations over the internet, you do not necessarily need an internet radio device. The same variety can also be accessed easily and is free of charge via an app or directly in the browser. Apps and websites usually offer a better overview when it comes to searching and more information about the stations. Following Heinrich Hertz's discovery of the existence of radio waves in 1886, the term "Hertzian waves" was initially used for this radiation.

AM or FM modulation is mainly used, but digital systems such as DMR are being introduced. These systems have a fairly limited range, usually 3 to 20 miles (4.8 to 32 km) depending on terrain. Repeaters installed on tall buildings, hills, or mountain peaks are often used to increase the range when it is desired to cover a larger area than line-of-sight. A modulated radio wave, carrying an information signal, occupies a range of frequencies. The information in a radio signal is usually concentrated in narrow frequency bands called sidebands just above and below the carrier frequency. The width in hertz of the frequency range that the radio signal occupies, the highest frequency minus the lowest frequency, is called its bandwidth .

Unmanned aerial vehicle – A drone is an aircraft without an onboard pilot, flown by remote control by a pilot in another location, usually in a piloting station on the ground. They are used by the military for reconnaissance and ground attack, and more recently by the civilian world for news reporting and aerial photography. The pilot uses aircraft controls like a joystick or steering wheel, which create control signals which are transmitted to the drone by radio to control the flight surfaces and engine.

Radiolocation is a generic term covering a variety of techniques that use radio waves to find the location of objects, or for navigation. Marine radar – an S or X band radar on ships used to detect nearby ships and obstructions like bridges. A rotating antenna sweeps a vertical fan-shaped beam of microwaves around the water surface surrounding the craft out to the horizon.

Unlike analog television, in which increasingly poor reception causes the picture quality to gradually degrade, in digital television picture quality is not affected by poor reception until, at a certain point, the receiver stops working and the screen goes black. Communication satellite – an artificial satellite used as a telecommunications relay to transmit data between widely separated points on Earth. These are used because the microwaves used for telecommunications travel by line of sight and so cannot propagate around the curve of the Earth. As of 1 January 2021, there were 2,224 communications satellites in Earth orbit.

When the doorbell is pressed it sends a signal to a receiver inside the house with a speaker that sounds chimes to indicate someone is at the door. The frequency channel used can usually be changed by the owner in case another nearby doorbell is using the same channel. Baby monitor – a crib-side appliance for parents of infants that transmits the baby's sounds to a receiver carried by the parent, so they can monitor the baby while they are in other parts of the house. The wavebands used vary by region, but analog baby monitors generally transmit with low power in the 16, 9.3–49.9 or 900 MHz wavebands, and digital systems in the 2.4 GHz waveband.

Since radio waves in these bands can travel intercontinental distances by reflecting off the ionosphere using skywave or "skip" propagation, shortwave is used by international stations, broadcasting to other countries. A slow transition from analog to digital radio transmission technologies began in the late 1990s. Part of the reason for this is that digital modulation can often transmit more information in a given bandwidth than analog modulation, by using data compression algorithms, which reduce redundancy in the data to be sent, and more efficient modulation.