Quasars and some pulsars are dim in the visible light range. In the radio spectrum, however, they're extremely bright, and as such observing them in telescopes that observe these wavelengths is more beneficial.
They function on entirely different principles. it is like asking what advantages does a parabolic sound detector ( a common spy device that looks like, but is not radar oriented) have over a pair of binoculars. one records sound or radio wavelengths, the other visual images. They have totally different applications one has a telescope operator as an observer, visually observing targets but the radio-telescope operator is merely a monitor. the analogy with radar is good as they are a derivative of Radio Direction and Ranging, hence RADAR,
They both work on the same principles. However . . .
The "gain" (light-gathering power, signal-gathering power) of any collector
depends on its size ... measured in wavelengths of the signal it's trying to
collect.
Just for an example . . .
The wavelength of the hydrogen spin transition that's often observed by radio
telescopes (1,420 MHz) is roughly 352 thousand times the wavelength of
yellow light (600 nm) that's often observed by opticaltelescopes.
And that's why you need a bigger collector for radio waves.
They are in effect special purpose Radar devices and work on different principles than optical telescopes. they are essentially specialized Radar devices some steerable(like marine radars) others are fixed focus.
An intersting fact is the British Joddrell Bank facility uses parts of an old Battleship turret for the movable portion"s foundations and bearings. a good use of war surplus.
Optical telescopes have a limited range in terms of observing visible electro-magnetical radiation, they are limited by the optical range of the human eye and cameras that are used to capture that light that is emitted by the objects in the sky. Optical telescopes are affected by light pollution, smog, clouds. Radio telescopes can "see" other electro-magnetic radiation which is not visible by the human eye, and as such it can reveal more information about a object in the sky then through an optical telescope.
Radio telescopes can measure a different part of the frequency spectrum than optical telescopes.
Because radio wavelengths are much longer than optical wavelengths.
because radio waves travel much further than an eye and a optical telescope can see.
The advantages of digital radio over analog radio are digital radios get more channels than analog, they are clearer in sound and signal and have more additional features.
-- It's easy and cheap to generate radio signals and put information on them. -- It's easy and cheap to detect radio signals at a great distance and recover the information from them. -- It's easy and cheap to pick out the radio signal you want from thousands of other signals. -- Radio can deliver information over great distances significantly faster than carrier pigeons, surface mail, runners, smoke signals, jungle drums, or optical fiber can.
The advantages of using television for education are the TVs keep students' attention better than books, and it is more fun than books. The disadvantages are that the students cannot interact with a TV, they do not know where the information came from, and they cannot always re-watch shows for missed information.
see www.soe.ucsc.edu/classes/cmpe150/Fall05/lecture6.ppt for the answerAnswerThe biggest is less attenuation (degradation) of signal, so that a message can travel significantly further over an optical fibre than over a copper (twisted pair of coax) cable before it becomes too garbled to understand. In addition, fibre optic cables are generally immune to electromagnetic interference (such as strong electrical or magnetic fields) nearby, while copper cables can have such interference reduce or completely destroy their ability to carry signals. Finally, it is much easier to transmit on multiple channels (frequencies) over fibre than over copper, so a fibre optic cable can handle many more simultaneous message streams than twisted pair or coax. In short: fibre allows hugely greater distances between endpoints, is practically immune to outside interference, and can handle hundreds or thousands of times more signal channels than twisted pair or coaxial cable.
Advantages of DAB Radio over FM/AM radio's: 1) they automatically tune into all of the available radio stations and so do not need retuning 2) they can display extra information using PAD, such as the song title, artist name and general information about the radio station 3) there is a greater choise of satations 4) There is less interference, and does not have the crackle that you sometimes getwith an FM/AM radio 5) With the newer and better made DAB radio's, you can pause and rewind the radio station Disadvantages of DAB Rdio's 1) there is not world wide coverage, so many areas have poor or no DAB radio signal 2) They are much more expensive - you can get a normal radio for less than £10, but it is very dificult to buy a DAB radio for less than £25 3) Most cars still use FM/AM radio's, so if FM/AM radio was shut down and only DAB radio was used then about 2/3 of people would not be able to liusten to music in there cars.
They function on entirely different principles. it is like asking what advantages does a parabolic sound detector ( a common spy device that looks like, but is not radar oriented) have over a pair of binoculars. one records sound or radio wavelengths, the other visual images. They have totally different applications one has a telescope operator as an observer, visually observing targets but the radio-telescope operator is merely a monitor. the analogy with radar is good as they are a derivative of Radio Direction and Ranging, hence RADAR,
See things that don't shine in the visible spectrum.
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advantages of adptive rf transreceiver
The advantages of digital radio over analog radio are digital radios get more channels than analog, they are clearer in sound and signal and have more additional features.
Cb radio... Over!
Optical fiber offers several advantages over traditional copper wiring, including faster data transfer rates, greater bandwidth capacity, increased resistance to electromagnetic interference, enhanced security, and less signal degradation over long distances. Optical fibers have numerous advantages over traditional copper wires. Read on to learn how optical fibers offer faster speeds, better signal quality, higher bandwidth, and greater durability, making them a preferred choice in many industries.
over cable, as optical signals over fiber, or wirelessly as radio signals
A radio telescope has an antenna and a receiver to study the stars. Radio waves are part of the same radiation spectrum as light, and they are emitted by many celestial bodies. Analysis of radio emissions can give us information over and above what can be obtained from light.
A radio telescope has an antenna and a receiver to study the stars. Radio waves are part of the same radiation spectrum as light, and they are emitted by many celestial bodies. Analysis of radio emissions can give us information over and above what can be obtained from light.
Wireless internet radio has many advantages over regular radio. Wireless internet allows access to a larger number of channels and is generally available in more areas.
The two major telescopes are refractive and reflective. Refractive uses two lenses and a 45 degree mirror. Lense, mirror lens. Reflective uses an open tube.light come in and strikes a concave mirror. Reflects back to the opening where a flat 45 degree mirror reflects light into an eyepiece lense that is near the opening. Images in a reflective telescope are backward without the use of an erecting prism. Further research for you, Dobsonian, Cassegrain.