Transmitter: Difference between revisions

From WikiMD's Wellness Encyclopedia

Newer edit →
CSV import
 
CSV import
Line 1: Line 1:
'''Transmitter'''
== Transmitter ==


A '''[[Transmitter]]''' is an electronic device that, with the aid of an [[antenna]], produces [[radio waves]]. The transmitter itself generates a [[radio frequency]] alternating current, which is applied to the antenna. When excited by this alternating current, the antenna radiates [[radio waves]].
A '''transmitter''' is an electronic device that produces radio waves with an antenna. The transmitter itself generates a radio frequency alternating current, which is applied to the antenna. When excited by this alternating current, the antenna radiates radio waves. Transmitters are necessary components of all electronic devices that communicate by radio, such as [[radio]] and [[television]] broadcasting stations, [[cellular phones]], [[wireless computer networks]], [[Bluetooth]]-enabled devices, [[garage door openers]], and [[two-way radios]].


== Function ==
== History ==


Transmitters are used in many forms of communication and in various devices such as [[telephones]], [[television broadcasts]], and [[computer networks]]. They are also used in [[wireless communication]] devices like cell phones, [[GPS]] units, [[Bluetooth]] enabled devices, and [[satellite]] communication.
The development of the transmitter began with the discovery of radio waves by [[Heinrich Hertz]] in the late 19th century. Hertz's experiments in 1887 demonstrated the existence of electromagnetic waves, which were predicted by [[James Clerk Maxwell]]. The first practical radio transmitters were developed by [[Guglielmo Marconi]] in the early 20th century, using spark-gap technology. These early transmitters were capable of sending Morse code signals over long distances.
 
In the 1920s, the invention of the [[vacuum tube]] allowed for the development of continuous wave transmitters, which could transmit audio signals. This led to the birth of [[AM radio]] broadcasting. The invention of the [[frequency modulation|FM]] transmitter by [[Edwin Armstrong]] in the 1930s improved the quality of radio broadcasts by reducing static and interference.


== Types of Transmitters ==
== Types of Transmitters ==


There are several types of transmitters, including [[AM Transmitter|AM]], [[FM Transmitter|FM]], and [[Television Transmitter|TV transmitters]]. Each type has its own specific use and function.
=== Radio Transmitters ===
Radio transmitters are used in [[broadcasting]] to send audio signals to a wide audience. They can be classified into AM and FM transmitters, based on the modulation technique used.


=== AM Transmitter ===
=== Television Transmitters ===
Television transmitters send both audio and video signals. They use a combination of amplitude modulation for video and frequency modulation for audio.


[[AM Transmitter|AM transmitters]] are used in [[AM broadcasting]], a type of long-range radio broadcasting using amplitude modulation.  
=== Microwave Transmitters ===
Microwave transmitters are used for point-to-point communication links, such as [[satellite communication]] and [[radar]].


=== FM Transmitter ===
=== Mobile and Wireless Transmitters ===
These transmitters are used in [[cellular networks]], [[Wi-Fi]], and [[Bluetooth]] devices. They operate at various frequencies and power levels depending on the application.


[[FM Transmitter|FM transmitters]] are used in [[FM broadcasting]], a method of radio broadcasting using frequency modulation.
== Components of a Transmitter ==


=== Television Transmitter ===
A typical transmitter consists of several key components:


[[Television Transmitter|TV transmitters]] are used for [[television broadcasting]], which sends both audio and video signals to television receivers.
* '''Oscillator''': Generates the radio frequency signal.
* '''Modulator''': Imposes the information signal onto the carrier wave.
* '''Amplifier''': Increases the power of the modulated signal.
* '''Antenna''': Radiates the signal into space.


== See Also ==
== Related Pages ==


* [[Radio]]
* [[Antenna (radio)]]
* [[Broadcasting]]
* [[Modulation]]
* [[Wireless Communication]]
* [[Radio broadcasting]]
* [[Television broadcasting]]
* [[Wireless communication]]


== References ==
== References ==


<references />
* "Radio Transmitters." Encyclopedia of Radio, edited by Christopher H. Sterling, Routledge, 2004.
* "The Invention of Radio." IEEE Global History Network, IEEE, 2010.
* "Wireless Communication: Principles and Practice." Theodore S. Rappaport, Prentice Hall, 2002.
 
== Gallery ==


[[Category:Communication devices]]
<gallery>
[[Category:Broadcasting]]
File:WDET-FM_transmitter.png|WDET-FM transmitter
[[Category:Wireless Communication]]
File:Signal_processing_system.png|Signal processing system
File:Transmisor_de_bulbos_AM_Elcom_Bauer_701_B_XEQK.jpg|AM Elcom Bauer transmitter
File:KWNR_Continental_816R-5B_SN_247.jpg|KWNR Continental transmitter
File:Icom_IC-746PRO.jpg|Icom IC-746PRO
File:
File:HA0478-006_(6011470974).jpg|Historical transmitter
File:Cordless_phone_icon.svg|Cordless phone
File:Garage-door-opener-remote-control.png|Garage door opener remote
File:Wireless_network.jpg|Wireless network
File:Plantronics_Voyager_Legend.JPG|Bluetooth headset
File:Dipole_xmting_antenna_animation_4_408x318x150ms.gif|Dipole transmitting antenna
File:Heinrich_Hertz_discovering_radio_waves.png|Heinrich Hertz discovering radio waves
File:Marconi_1897_spark_gap_transmitter.jpg|Marconi's spark gap transmitter
File:Powerful_spark_gap_transmitter.png|Powerful spark gap transmitter
File:Poulsen_arc_1MW_transmitter.jpg|Poulsen arc transmitter
File:Alexanderson_Alternator.jpg|Alexanderson alternator
File:First_vacuum_tube_AM_radio_transmitter.jpg|First vacuum tube AM radio transmitter
File:Blythe_House_Science_Museum_stores_tour_99.JPG|Blythe House Science Museum
File:Armstrong_prototype_FM_transmitter_1935.jpg|Armstrong's FM transmitter prototype
File:Magnetron_radar_assembly_1947.jpg|Magnetron radar assembly
</gallery>


{{stub}}
[[Category:Radio technology]]

Revision as of 01:10, 10 February 2025

Transmitter

A transmitter is an electronic device that produces radio waves with an antenna. The transmitter itself generates a radio frequency alternating current, which is applied to the antenna. When excited by this alternating current, the antenna radiates radio waves. Transmitters are necessary components of all electronic devices that communicate by radio, such as radio and television broadcasting stations, cellular phones, wireless computer networks, Bluetooth-enabled devices, garage door openers, and two-way radios.

History

The development of the transmitter began with the discovery of radio waves by Heinrich Hertz in the late 19th century. Hertz's experiments in 1887 demonstrated the existence of electromagnetic waves, which were predicted by James Clerk Maxwell. The first practical radio transmitters were developed by Guglielmo Marconi in the early 20th century, using spark-gap technology. These early transmitters were capable of sending Morse code signals over long distances.

In the 1920s, the invention of the vacuum tube allowed for the development of continuous wave transmitters, which could transmit audio signals. This led to the birth of AM radio broadcasting. The invention of the FM transmitter by Edwin Armstrong in the 1930s improved the quality of radio broadcasts by reducing static and interference.

Types of Transmitters

Radio Transmitters

Radio transmitters are used in broadcasting to send audio signals to a wide audience. They can be classified into AM and FM transmitters, based on the modulation technique used.

Television Transmitters

Television transmitters send both audio and video signals. They use a combination of amplitude modulation for video and frequency modulation for audio.

Microwave Transmitters

Microwave transmitters are used for point-to-point communication links, such as satellite communication and radar.

Mobile and Wireless Transmitters

These transmitters are used in cellular networks, Wi-Fi, and Bluetooth devices. They operate at various frequencies and power levels depending on the application.

Components of a Transmitter

A typical transmitter consists of several key components:

  • Oscillator: Generates the radio frequency signal.
  • Modulator: Imposes the information signal onto the carrier wave.
  • Amplifier: Increases the power of the modulated signal.
  • Antenna: Radiates the signal into space.

Related Pages

References

  • "Radio Transmitters." Encyclopedia of Radio, edited by Christopher H. Sterling, Routledge, 2004.
  • "The Invention of Radio." IEEE Global History Network, IEEE, 2010.
  • "Wireless Communication: Principles and Practice." Theodore S. Rappaport, Prentice Hall, 2002.

Gallery

  • WDET-FM transmitter
    WDET-FM transmitter
  • Signal processing system
    Signal processing system
  • AM Elcom Bauer transmitter
    AM Elcom Bauer transmitter
  • KWNR Continental transmitter
    KWNR Continental transmitter
  • Icom IC-746PRO
    Icom IC-746PRO
  • Historical transmitter
    Historical transmitter
  • Cordless phone
    Cordless phone
  • Garage door opener remote
    Garage door opener remote
  • Wireless network
    Wireless network
  • Bluetooth headset
    Bluetooth headset
  • Dipole transmitting antenna
    Dipole transmitting antenna
  • Heinrich Hertz discovering radio waves
    Heinrich Hertz discovering radio waves
  • Marconi's spark gap transmitter
    Marconi's spark gap transmitter
  • Powerful spark gap transmitter
    Powerful spark gap transmitter
  • Poulsen arc transmitter
    Poulsen arc transmitter
  • Alexanderson alternator
    Alexanderson alternator
  • First vacuum tube AM radio transmitter
    First vacuum tube AM radio transmitter
  • Blythe House Science Museum
    Blythe House Science Museum
  • Armstrong's FM transmitter prototype
    Armstrong's FM transmitter prototype
  • Magnetron radar assembly
    Magnetron radar assembly
Retrieved from "https://wikimd.com/index.php?title=Transmitter&oldid=6201678"