Kenwood car stereos are protected against theft by four digit security codes. If a thief steals a Kenwood car stereo, they will not be able to use the stereo until they enter the secret for digit security code.
Unfortunately, many legitimate owners are also locked out of their Kenwood car stereos due to these security codes. This typically happens to people who buy used cars from people who forget to share the security code. However, it also happens to people who simply forget their...
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XM Radio is a type of satellite radio that is extremely popular with people that want more entertainment and programming choices from their radio with less commercials and interruptions. XM Radio is similar to cable TV, where you pay a small fee each month to receive superior programming. In XM Radio's case, you can receive over 150 different channels, many with commercial free music, talk show personalities and quality sports programming such as Major League Baseball and NASCAR.
In...
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More properly known as the Bayonet Neill-Concelman connector, the BNC connector is one of several radio frequency connectors on the market today. The name of the connector is derived from a combination of two things: 1) the connecting technology employed; and 2) the names of the two inventors of the device. Paul Neill of Bell Labs and Carl Concelman sought to develop a connector that would employ a bayonet mount mechanism for locking. Building on the research of Octavio M. Salati, the two...
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Quadrature Amplitude Modulation (QAM) is a complicated name for a simple technique. In the simplest of terms, Quadrature amplitude modulation is the combination of amplitude modulation and phase shift keying. More technically, quadrature amplitude modulation is a system of modulation in which data is transferred by modulating the amplitude of two separate carrier waves, mostly sinusoidal, which are out of phase by 90 degrees (sine and cosine). Due to their phase difference, they are called...
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Amplitude modulation is a type of modulation where the amplitude of the carrier signal is varied in accordance with the information bearing signal.
The envelope, or boundary, of the amplitude modulated signal embeds the information bearing signal.
The total power of the transmitted signal varies with the modulating signal, whereas the carrier power remains constant.
A nonlinear device is used to combine the carrier and the modulating signal to generate an amplitude modulated signal...
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The SMA (SubMiniature Type A) connector is a type of the radio frequency connector developed in the 1960s to make it easier to connect coaxial cables. Using a screw-type design instead of the common ‘push-pull’ system, the SMA connector allows for a quick connection; and can be used in both alternating and direct current applications. Just like BNC connectors, SMA connectors find use in video and Ethernet applications.
The SMA connector can be of two types, the 905 and the...
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Generally, a transmission signal contains more than a single frequency. This is to say that there might be several different frequencies linked together or else superimposed on each other. This is just the way all telecommunication systems function. For example, with today's communication technology it is virtually impossible to send low frequencies without experiencing any distortion. In fact, when low frequencies are sent the distortion is frequently so severe that the signal cannot...
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A dBm is a standard unit for measuring levels of power in relation to a 1 milliwatt reference signal.
dBm is similar to dB, or decibel, except that where dB is relative to the power of the input signal, dBm always relates to a 1 milliwatt signal.
In other words, dB is a relative measurement and dBm is an absolute measurement.
A minus sign before the dBm indicates a loss and a plus sign or no sign at all before the dBm indicates a gain. The dBm Formula
The dBm value of a signal can be...
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Radio was not invented by any single person, but instead was a culmination of several scientists' research, each of whom pioneered a different area of electromagnetic radiation and radio waves during the late 1800s and early 1900s. Among these men are well known researchers such as Heinrich Rudolf Hertz, James Clerk Maxwell, David E. Hughes, Thomas Edison, and Nikola Tesla. The Role of James Clerk Maxwell
In order to fully understand the invention of radio, we must go back to an...
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Reasons to install your own car audio system is one, if you are on a tight budget and would like to save possibly hundreds of dollars on installation costs and two, if you would like to customize your car audio system installation. Either way, it is easier than ever to install a car audio system and here are some tips. What is a Car Audio System?
Before you install your car audio system, it is best to define what a car audio system is. Usually a car audio system includes a car stereo...
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