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A transmitter is an electronic device which, usually with the aid of an antenna, propagates an electromagnetic signal such as radio, television, or other telecommunications. In other applications signals can also be transmitted using an analog 0/4-20 mA current loop signal.

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Wikipedia about transmitters

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A transmitter is an electronic device which, usually with the aid of an antenna, propagates an electromagnetic signal such as radio, television, or other telecommunications. In other applications signals can also be transmitted using an analog 0/4-20 mA current loop signal.

Transmitter types

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In radio electronics and broadcasting, a transmitter usually has a power supply, an oscillator, a modulator, and amplifiers for audio frequency (AF) and radio frequency (RF). The modulator is the device which piggybacks (or modulates) the signal information onto the carrier frequency, which is then broadcast. Sometimes a device (for example, a cell phone) contains both a transmitter and a radio receiver, with the combined unit referred to as a transceiver. In amateur radio, a transmitter can be a separate piece of electronic gear or a subset of a transceiver, and often referred to using an abbreviated form; "XMTR". In consumer electronics, a common device is a Personal FM transmitter, a very low power transmitter generally designed to take a simple audio source like an iPod, CD player, etc. and transmit it a few feet to a standard FM radio receiver. Most personal FM transmitters In the USA fall under Part 15 of the FCC regulations to avoid any user licensing requirements.

In industrial process control, a "transmitter" is any device which converts measurements from a sensor into a signal to be received, usually sent via wires, by some display or control device located a distance away. Typically in process control applications the "transmitter" will output an analog 4-20 mA current loop or digital protocol to represent a measured variable within a range. For example, a pressure transmitter might use 4 mA as a representation for 50 psig of pressure and 20 mA as 1000 psig of pressure and any value in between proportionately ranged between 50 and 1000 psig. (A 0-4 mA signal indicates a system error.) Older technology transmitters used pneumatic pressure typically ranged between 3 to 15 psig (20 to 100 kPa) to represent a process variable.

Frequency Control

see: Radio transmitter design

History

In the early days of radio engineering, radio frequency energy was generated using arcs known as Alexanderson alternator or mechanical alternators (of which a rare example survives at the SAQ transmitter in Grimeton, Sweden). In the 1920s electronic transmitters, based on vacuum tubes, began to be used.

Power output

In broadcasting, and telecommunication, the part which contains the oscillator, modulator, and sometimes audio processor, is called the exciter. Confusingly, the high-power amplifier which the exciter then feeds into is often called the "transmitter" by broadcast engineers. The final output is given as transmitter power output (TPO), although this is not what most stations are rated by.

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News about Transmitters

Personal Tech

Washington PostThe Washington Post's Rob Pegoraro will be online to discuss recent reviews and answer your personal tech questions. http://www.washingtonpost.com/wp-dyn/content/discussion/2008...

Data Logging System records corrosion in pipelines.

ThomasNetComplementing CorrTran® MV online corrosion monitoring transmitter, Division 2/Zone 2 CorrTran® Corrosion Data Logging System allows users to access real-time corrosion data via Ethernet, USB, SD card, or locally via videographic chart recorder. System includes KFD2-HLC-EX1.D HART loop converter, which receives HART data from CorrTran MV corrosion monitor and delivers three 4-20 mA outputs that ...http://news.thomasnet.com/fullstory/549021

CTIA: Cy-Fi for cyclists

Yahoo! Tech Advisors I was happy to finally see Cy-Fi on display at CTIA this week. This small speaker connects wirelessly to any Bluetooth-enabled device or iPod so you can listen to your tunes anytime without damaging your hearing. What I really like about the speaker is the sleek design, its portability, and the way it attaches to almost anything including your bike's handlebars, backpack, or sun visor. ...http://tech.yahoo.com/blogs/hughes/33955

Broadcast RF Power Semiconductor Market Found to Be Double Its Assumed Size, According to ABI Research

Broadcast NewsroomSCOTTSDALE, Ariz., BUSINESS WIRE -- The global market for RF power semiconductors used in broadcasting is much larger than years of "conventional wisdom" have suggested, according to a new study from ABI Research.http://www.broadcastnewsroom.com/articles/viewarticle.jsp?id...

Tower activists urge MPs to change law

The New Zealand HeraldUrgent law change is required to stop cellphone companies forcing towers upon communities wherever and whenever they want, MPs were told yesterday.http://www.nzherald.co.nz/technology/news/article.cfm?c_id=5...

News about Transmitters

Settlement proposed for Questar billing blunder

Boston GlobeThe case involves transmitters installed at homes and businesses that are supposed to allow company trucks driving along streets to automatically record each customer's natural gas consumption. In November, the utility discovered about 500 ... http://www.boston.com/business/articles/2008/10/10/settlemen...

Review: Slingbox PRO

Times OnlineOne very annoying requirement at this point is that you have to stick two infrared transmitters close to the infrared receiver on your TV source. The Slingbox sends infrared signals through these transmitters to change channels, increase the ... http://business.timesonline.co.uk/tol/travel/business/articl...

Chrontel Offers Advanced HDMI(TM) CEC Chip

ForbesMany A/V products use MPEG decoders or DTV ICs that have internal HDMI transmitters. The CH7323 allows such systems to add CEC functionality without the cost of an additional, redundant HDMI-CEC transmitter and without a CPU for CEC message processinghttp://www.forbes.com/businesswire/feeds/businesswire/2008/1...

TransDock Direct connects iPods via auxiliary input

MacNNIt transmits to stereos mainly via auxiliary input, which is said to offer better sound output than rival FM transmitters; also provided is a cassette adapter, for when aux-in is not an option. iPod touch users can additionally rotate the holder, in ... http://www.macnn.com/print/58097

Texas State researchers track Guadalupe bass to learn more about their ...

Houston ChronicleThe project, funded with a grant from the Texas Parks and Wildlife Department, involved fitting 12 adult Guadalupe bass in each river with internal transmitters that allowed researchers to determine the near-exact location of the fish in the streams ... http://www.chron.com/disp/story.mpl/sports/6048054.html

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Honeywell Pressure Transmitters

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Transmitters

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selling low,meduim and high power fm and tv transmitter all over the world. emetteur fm , STL link et television, Best prices on earth - Cheap price High quality - made in USA ... http://imagetransmitters.com
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Answers for Transmitters

Jonathan

What is a cheap or generally cheap mp3 player with 4GB-8GB of memory that is compatible with fm transmitters?

Jonathan
iswaswill

Why does human papillomavirus only affect women? Are men transmitters of this virus?

iswaswill
ivonkcme2

Where can I find books on How to build wireless voice transmitters?

ivonkcme2go to a libarty in a place.
Hope

Is there someway I can hook my ipod up through my stereo of my car without using the FM transmitters?

Hopethere are wires that can plug into RCA outputs on the back of your stereo but only if it a after market deck otherwise it wont have these outputs. it will have a headphone end on the other side that ...
yp_paul_collinsville

Is it possible to 'mind control' someone without internal transmitters?

yp_paul_collinsvilleYep........ it's done everyday. School, religion, TV, radio, newspapers and magazines....... movies, community gatherings...... what do think those things are all about? Education? Entertainment? LMAO...

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