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In electronics, an antenna amplifier (also: aerial amplifier or booster) is a device that amplifies an antenna signal, usually into an output with the same impedance as the input impedance. Typically 75 ohm for coaxial cable and 300 ohm for twin-lead cable. An antenna amplifier boosts a radio signal considerably for devices that receive radio ...
MPX filter is a function found in analogue stereo FM broadcasting and personal monitor equipment, [1] FM tuners [2] and cassette decks. [3] An MPX filter is, at least, a notch filter blocking the 19 kHz pilot tone, and possibly higher frequencies in the 23-53kHz and 63-75kHz bands.
The head unit provides a user interface for the vehicle's information and entertainment media components: AM/FM radio, satellite radio, DVDs/CDs, cassette tapes (although these are now uncommon), USB MP3, dashcams, GPS navigation, Bluetooth, Wi-Fi, and sometimes vehicle systems status.
The AM/FM radio combined with a CD player has remained a mainstay of car audio, despite being obsolescent in non-car applications. [17] [18] In the 2010s, internet radio, satellite radio, streaming, and podcasting came into competition with AM/FM radio. By this time some models were offering 5.1 surround sound.
FM broadcasting originated in the United States and was adopted as a worldwide standard. [16] FM broadcasting in stereo in the USA began in 1961 when authorized by the FCC. This led to greater demand for new radio stations and better technology in radios. The growth of hi-fi stereo systems and car radios in turn led to a boost in FM listening.
FM improvement threshold is the point in an FM (frequency modulation) receiver at which the peaks in the RF signal equal the peaks of the thermal noise generated in the receiver. A baseband signal-to-noise ratio of about 30 dB is typical at the improvement threshold, and this ratio improves 1 dB for each decibel of increase in the signal above ...
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RAI broadcasts on Rai Radio 1, Radio2 and Radio 3 FM. This service covers the entire country. Additionally, Rai operates a dedicated traffic news station heavily focusing on motorway viability which trasmits on the fixed frequency of 103.3 FM , Rai Isoradio. A commercial service is provided by radio station RTL 102.5 in cooperation with InfoBlu.
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