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Transceiver
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==History== [[File:Icom.png|thumb|A modern [[High frequency|HF]] transceiver with a [[spectrum analyzer]] and [[Digital signal processing|DSP]] capabilities]] The transceiver first appeared in the 1920s.{{cn|date=March 2024}} Before then, receivers and transmitters were manufactured separately and devices that wanted to receive and transmit data required both components. Almost all amateur radio equipment today{{when?|date=March 2024}} uses transceivers, but there is an active market for pure radio receivers, which are mainly used by [[shortwave listening]] operators.{{cn|date=March 2024}} ===Analog=== Analog transceivers use [[frequency modulation]] to send and receive data. Although this technique limits the complexity of the data that can be broadcast, analog transceivers operate very reliably and are used in many emergency communication systems. They are also cheaper than digital transceivers, which makes them popular with the [[Citizens band radio|CB]] and [[HAM radio]] communities. ===Digital=== Digital transceivers send and receive [[binary data]] over radio waves. This allows more types of data to be broadcast, including video and encrypted communication, which is commonly used by police and fire departments. Digital transmissions tend to be clearer and more detailed than their analog counterparts. Many modern wireless devices operate on digital transmissions.
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