What Is A Crystal Diode Detector?

Posted on July 1, 2013
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A crystal diode detector is an electronic component that was first invented at the turn of the twentieth century. This type of diode was commonly used in crystal radios from around 1906 through World War II. Sometimes known as a cat’s-whisker detector, the diode works by having a wire lightly touching a semiconducting crystal mineral. In most cases, the mineral used was galena, the mineral form of lead sulfide. Other minerals used in place of galena was iron pyrite, silicon or carborundum.

This type of radio reached the height of its popularity around 1920. Once Read more

How Amplitude Modulation Is Simpler Than Frequency Modulation

Posted on April 20, 2013
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FM has been the king of the airwaves since it’s discovery. Operating in the range of 87.5MHz to 108MHz, FM radio offers a much better sound quality than AM, but it can’t reach the same distances. Although much more simple, AM radio can reach vast distances due to the nature of it’s modulation.

AM radios operate between 520kHz to 1710kHz in the United States. This carrier frequency differs in other parts of the world, but it’s effective range is much the same. What gives AM Read more

Is The Radio Really That Important Anymore?

Posted on April 19, 2012
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In a world where we spend most of our time watching our DIRECTV or checking our sites on our computers or smartphones, you would think we really wouldn’t have much use for the radio. We get all of our music online or through various music television channels and we even get our news through nothing more than a few presses of the button on our smartphones, but how do you get your entertainment when you’re driving in the car or commuting to work every day? I certainly hope you don’t type away on your smartphones while you drive, since such an action is justifiably illegal in most states.

No, I would imagine you still use the radio, be it AM or FM or XM, when it comes to passing the time during a hard days commute. We all do. The radio is simply an easily accessible diversion and there are so many different kinds of programs to choose from that you could well be home before you even know it. Music, news, talk, sports – there are so many programs to choose from on the radio and you don’t have to type away on a screen or wait for internet service – all you have to do is twist some knobs and drive.

How The First AM Radio Set Worked

Posted on July 21, 2011
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In 1887- 1920 there was a technological advancement that today we call the AM/FM Radio. Back then it was only AM. This technology was called wireless telegraph. Radio waves are all around us. They are virtually undetectable by human. You cant touch it or see it. One antenna from an output source, outputs sound. Music, interviews, and news travel these radio waves to a receiving antenna which is the listener. It takes just a few simple components to make a radio as the radio waves are already Read more

KCBS: The World’s Oldest AM Radio Station

Posted on July 20, 2011
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KCBS was founded as KQW in 1909 by engineer Charles Herrold in San Jose, California. Because of this it could have claim to the title as the oldest radio station in America to continually broadcast. It has had many different call signs since then eventually settling on KCBS when it was bought by CBS in the late 1940s. It was knows as KCBS until 1995.

Later, in 1968, KCBS became an all-news radio station. It is knows as one of the first all-news radio stations in America. It was already widely known as a news Read more

The History Of AM Radio Post World War I

Posted on July 18, 2011
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AM radio was the first type of radio to be invented. It was first started in the early 20th century as widely used during World War I as a means to relay information and news to people during the war. A lot of these original stations were amateur stations that were started by civilians all over the country. There was a later a ban placed on these amateur radio stations towards the end of World War I.

The Navy had a huge part in promoting amateur radio use after World War I. They wanted to use the Read more

The History Of AM Radio Prior To World War I

Posted on July 16, 2011
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AM radios history before World War I is a very interesting and entertaining history. The first experimental broadcast of the AM radio happened on Christmas Eve in 1906. Reginald Fessenden, a Canadian, was this experimenter. This experimentation came over a decade after the invention of the radio which was invented in 1897. Many of the earliest radio broadcasts were made through radio telegraphy and telephony. At the turn of the century Fessenden began to make weak radio broadcasts over Read more