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radio

Radio is the technology of signaling and communicating using radio waves. Radio waves are electromagnetic waves of frequency between 30 hertz (Hz) and 300 gigahertz (GHz). They are generated by an electronic device called a transmitter connected to an antenna which radiates the waves, and received by another antenna connected to a radio receiver. Radio is very widely used in modern technology, in radio communication, radar, radio navigation, remote control, remote sensing, and other applications.
In radio communication, used in radio and television broadcasting, cell phones, two-way radios, wireless networking, and satellite communication, among numerous other uses, radio waves are used to carry information across space from a transmitter to a receiver, by modulating the radio signal (impressing an information signal on the radio wave by varying some aspect of the wave) in the transmitter. In radar, used to locate and track objects like aircraft, ships, spacecraft and missiles, a beam of radio waves emitted by a radar transmitter reflects off the target object, and the reflected waves reveal the object's location. In radio navigation systems such as GPS and VOR, a mobile receiver accepts radio signals from navigational radio beacons whose position is known, and by precisely measuring the arrival time of the radio waves the receiver can calculate its position on Earth. In wireless radio remote control devices like drones, garage door openers, and keyless entry systems, radio signals transmitted from a controller device control the actions of a remote device.
Applications of radio waves that do not involve transmitting the waves significant distances, such as RF heating used in industrial processes and microwave ovens, and medical uses such as diathermy and MRI machines, are not usually called radio. The noun radio is also used to mean a broadcast radio receiver.
Radio waves were first identified and studied by German physicist Heinrich Hertz in 1886. The first practical radio transmitters and receivers were developed around 1895–1896 by Italian Guglielmo Marconi, and radio began to be used commercially around 1900. To prevent interference between users, the emission of radio waves is regulated by law, coordinated by an international body called the International Telecommunication Union (ITU), which allocates frequency bands in the radio spectrum for different uses.

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  1. J

    Radio frequency heating controls

    Are radio frequency heating controls any good or should I try to go for wired one's?
  2. Dan

    FIXRADIO Tunes Request Thread (And Rugged DAB Radio Recommendations)

    FIXRADIO - Tunes Request Thread - The PlumbersForums.net official unofficial tunes request and shout-out thread. This isn't something we've organised with FIXRADIO officially. So it's the unofficial official tunes request thread. If you really really want a tune on, use the usual channels...
  3. B

    Advice on smart thermostat/RF

    Hi I am looking into new controls for my soon to be installed new combi boiler. 1- I do not have the internet so I need a kit that also works on RF 2- I want to have the option to add smart valves in the future (if I get the internet, or can some work on RF?). 3- It would be good to have a kit...
  4. Dan

    What radio station do you listen to?

    What radio station do you listen to? And what radio do you use on site?
  5. R

    Makita site radio

    Anyone got one? What's the difference between the 102 & 106? The price is one difference. Any others? Cheers all Rct
  6. R

    Radio

    So who used to sit at home on a Sunday listening to the top 40 on the radio then having sandwiches & cake for tea? Who used to record from the radio? Me & my sister did! Great days
  7. P

    Looking for sole traders to test out a new expense receipt tracking app

    I'm looking for sole traders to test out a new expense receipt tracking app. You just take photos of your expense receipts and it automatically updates an inbuilt Self Assessment form. Anybody interested?
  8. Chalked

    New Makita DAB radio!

    Got thus email from ITS tools today. a radio that doubles up as an impact driver! Wish I had thought of that:biggrinjester:
  9. B

    can you help? diy sos needs you

    DIY SOS Veteran's Special needs you! | BFBS Radio
  10. D

    Which radio station?

    I do not expect repeat custom if I get my groove on while doing a job, so tend to listen to talk radio. With it being transfer deadline day, I'm listening to Talk Sport today.. as a football fan, it's nice to stay up to date with stuff but some of the hosts/guests are particularly irritating...
  11. M

    Gas engineers servicing/fixing boilers exposed on Radio 4

    I didn't hear it ... but if you can get it on "listen again" it is today's episode of You and Yours BBc r 4 about 10 minutes into the programme. I think it may have been Which? doing under cover exposure of engineers doing things wrong...
  12. D

    makita radio

    hi all I've been looking at the makita radio, I've got the 10.8 one and its okay not great. so the question is the dab radio worth £50 more than the normal one i want one with good quality only listen to radio 1 and juice fm and also do it charge the battery
  13. T

    what radio station gets your attention /

    So.....who are you listening to?.....planet rock and radio 2 for me with a bit of XFM and absolute 80's....
  14. M

    Anybody used local radio for advertising?

    Just wondered what it was like. I've gone a bit slow again and the boredom is killing me. I'm kind of guessing it will be expensive but if it works then it may be worth the investment. Having only started in May though means money is still a bit tight so don't want to just go in gun-ho.
  15. M

    Cheap Milwaukee C12PD-202C Percussion Combi Drill

    Just a heads up to say Toolstation are selling the 12V Milwaukee combi drill with 2 batteries, charger and carry case for less than £100.
  16. Chalked

    Charlie Mullins on radio 2 this morning

    He was on Chris Evans show this morning as a heating expert! best that he cold come up with was, " turn your boiler stat down"! That will make it cheaper to run. not a bad tip, but why not go the whole hog and turn the blooming lot off. It's free then.:001_9898:
  17. cr0ft

    Radio Advertising

    Hi all. Has anyone ever tried advertising on local radio and if so how did it work? Just interested atm that's all.
  18. R

    System boilers with high modulation radio and independently head/DHW coil flow tempe

    So as to get the best condensing when running heating, the flow temperature from the boiler needs to be set as low as possible, by installing radiators that are sized for 50c => 30c (often called oversized.) However the DHW tank must be heated to above 60c, so needs a flow temperature from the...
  19. D

    favourite radio station

    what is your favourite radio station?? mine is probably radio 1 or capital fm probably because I'm young.
  20. W

    A pyschologist on the radio said..

    When dealing with managing likely successes people are cautious, when faced with a small loss or a bigger loss people frequently gamble. Very interesting. I wonder how knowledge of this lesser known trait in most people could be used to make them spend more money.
Creating content since 2001. Untold Media.

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