why we don't use digital in earth broadcasting??
343104
We do! Many TV stations in major markets have HDTV broadcasts. There are some forms of digital terrestial radio. Commercial and ham radio make extensive use of digital technology.
168211
Cheap receivers are possible.  Take AM radio, for example.  It is very wasteful of bandwidth compared to a digital transmission.  However, you can receive AM with a simple envelope detector.  You can receive AM with a "crystal radio"  constructed with only a diode, a coil, a capacitor, and a pair of headphones.
208385
There is significant research being done in imaging through objects like bricks, etc. However, much more research needs to be done. And the technology is still very far away to image such tings from space. \nSo NO.\n\nHopefully the technology would be used to image into the ground and used for mine detection in many parts of the world.
588856
Despite the Rolling Stones song, you can't always get what you need. And everyone knows you don't always get what you want.\n\nSatellites broadcast to a fairly large footprint on the ground. So you can, if you're in its footprint, and with an appropriate antenna, properly aimed, and an appropriate low noise amplifier, receive a signal. Whether you can make sense of what you've received is quite something else altogether. TV satellite broadcasting is protected from indiscriminate reception with one or more technological tricks. You can, unless the box vendor is the FBI in desguise, buy 'descramblers' for satellite and cable TV signals in the backs of various magazines. On the Internet side, you presumably want to receive the contents of this or that web site, not just any old broadcast of Internet data, and so even if you can descramble (for free because you've got your own descrambling box now) a satellite signal, it won't be what you wanted. \n\nSo, you must have the ability to send control signals to the broadcast origin point (always a ground station somewhere, given the constraints on space and weight for these satellites). \n\nAnd they'll ignore you without an account (and so $ from you) for two reasons. You don't have an account on their computers which allows you to arrange for connections to the Internet (and the Web site you're after), and you don't have the appropriate authenticaiton to talk to the satellite so it will pass your control signals back to the ground station. \n\nSince satellites are expensive to design, build, launch, and maintain, there are no hobbyist groups providing free Internet access. without that, you're limited to commercial services (or government service if you're eligible) and they will universally require some sort of authentication (typically cryptographic at the information carrying level, and usually some raw signal based authentication as well) before you can use the system, and that will require a business relationship before they will set one up for you. And for that they will want a fee.\n\nI think you aren't going to get what you want. And you're probably not going to get what you need, if you define it as free Internet access by satellite. I recommend WiFi or something similar, if it's possible where you're located.
326662
This is (or was) referred to as "Band 2 VHF"  The other VHF bands being used for purposes other than public broadcast. VHF being "very high frequency", higher than HF (= Short-wave) but lower than UHF (Ultra high frequency, as used for example by normal television transmission) \nIf by "Why?", you mean "Why was this frequency selected for this purpose?" I have no expert knowledge, but presume it was a useful trade-off between the bandwidth required for FM audio transmission, and the area a transmitter could cover effectively.
944986
lots of problems with sky, mainly due to loss of reception in poor weather, but that can't be helped im afraid since the reception of the signal depends on the line of sight from the sattelite to your dish being clear, ie no clouds, heavy rain, snow etc. NTL/Telewest are good providers, but again the same applies because they get their programme contents from sattelites, only difference being they use huge dishes whereas your home dish is probably a standard 60cm dish, so though signal loss is possible in bad weather even with cable, its not as likely, the big plus side is, the broadband and phone packages availale with cable, they more than make up for any tv disruption, so have a look at NTL/Telewest packages
1040766
Sure, any image or piece of film can be broadcast and displayed in high definition, assuming it's digitally configured to be so and displayed on a screen capable of high definition resolution.  The problem is that cartoons typically don't have a level of detail to them that demand high definition -- they're usually big blocks of color, and often no shading or even perspective at all.  So you wouldn't bother getting an HDTV to watch "South Park," for instance, or any of the older Bugs Bunny cartoons, because you wouldn't notice a difference.  The only cartoons that I can think of where HD might be an advantage are some of the anime ones by Hiyao Miyazaki, or the painstakingly rendered CGI movies like "Final Fantasy: The Spirits Within," where somebody BOTHERED to animate down to individual hairs, or skin pores visible on a closeup shot.  Otherwise, cartoons just weren't made for HD.
539938
Its difficult to buy new monitors or TVs that are not HD.  The problem is that it is equally difficult to get a signal and video cables that fully support HD pictures, so even though you have the CAPACITY to watch HD, the reality is its just a scam to charge you more for hardware that you cannot benefit from anyway.  I have had two HD televisions over the last 7 years but not one program has even been sent to me in HD.
532193
it could be possible to use an satellite internet service provider from anywhere on the globe without filtering.  though you would have to have a satellite dish installed to recieve the signals.\n\nthe filtering occurs at the ISP level so if you cant get to a different provider, you have little chance of defeating the filtering without HEAVY coding/hacking.
1070068
I hate seeing the beauty of rural communities spoiled by technology.  I guess it is necessary, though.  If not, there would be no cable, poor phone service, bad water, old (if any) electric and gas supplied to the entire community, and possibly no cell and PC services.
1074464
Online broadcasting is not available for all TV posts, and where it's available it usually costs! You ca try the videos from google.com! You can find there almost anything!
957101
None really - thats why digital signalling has taken over, now we have the technology. A analogue signal attenuates over distance and if you amplify it you also amplify the noise and interference. Digital signals also attenuate but can be repeated, which leaves the unwanted part of the signal behind.
938725
Its all about digital signals rather than analogue.  By 2012 you will have to be digital compatible otherwise you'll have a blank screen...;
45057
not all stations do this\nit depends on their licence from the FCC
792027
I saw this headline on teletext recently but its actually misleading as the final will still be shown live but they will air it five seconds behind so the editor can quickly edit out any swearing, they can delay the signal slightly this happens all the time with digital tv against analogue, I found this out when I had a freeview digital channel on in one room and my dad in the next had switched onto the same channel but on standard analogue, there was a slight delay on the digital making it sound like an echo, don't ask me the technical side of exactly out it works because I don't know but thats whats going to happen for the Big Brother final anyway, I stand to be corrected but I think this process has already been used for other "live" shows in the past, they could just simply put the final on later like you said but a large percentage of the audience are children so they will want them to be able to see it relatively easily as well.
363234
Well, it seems like someone hacked into AskJeeves, because I became so curious about your question that I went to AskJeeves. \n\nAnyway, visit this page:\n\nhttp://www.askforkids.com/web?q=Why+does+Earth+move+on+a+tilted+axis%3F\n\nPerhaps it shall work on your computer. Whenever I click on the result, it visits the page temporarily and then suddenly goes to a different page, which seems to want to advertise, though it's under construction.\n\nGreat question!\n\nI personally believe that if the Earth did not use a tilted axis, it would not have electromagnetic fields across it. This would vary the different compositions of materials, and though I do not have very much knowledge about this, it probably would mean that humans could not survive, because humans use electromagnetic forces for various things.
403407
There are several reasons why, I'll list some of them:\n\n- For any given power of wave transmitted, regardless of the frequency: a radio wave will lose power the further it propogates from the transmitter source because of the square distance law (the further away from a point source, the square root of the power is received). I forget the exact way to word it, but that's one reason.\n- Atmospheric absorbtion: the atmosphere both aids in the propogation of the radio waves (the ionosphere, tropospheric bending), but it also absorbs a portion of the wave. It happens.\n\nOne of the things to keep in mind when talking about radio waves is frequency. The general rule is: the lower the frequency, the more bendable it is. At night, you can listen to AM radio stations from around the world, if you have a sharp enough receiver. During the day, because the sun's rays are interacting with our atmosphere more, exciting the ionosphere, AM propogation is cut down severely. During the Super Bowl, when I was in my car in Pennsylvania, I listened to the broadcasts on AM coming from Detroit, MI and Windsor, Ontario (approx. 600 miles away). As an amateur radio operator, I've talked to people thousands of miles away based on the bending of radio waves either directly around the earth (groundwave) or by having them "bounce" or refract in the ionosphere above the earth (skywaves). In fact, one of the "cool" things about AM radio stations is that they have 2 different antenna setups: 1 for the daytime, because the signals travel one certain way (mostly groundwave), and another setup for the nighttime, to prevent interference with other stations further away that are on the same frequency (mostly skywave). Listen in to one of your local AM stations around sunset and you should hear the automatic switch between the setups; the nighttime pattern should sound less strong, a lil warbly even.\n\nWhen you start talking about the frequencies of FM radio, however, that's not the case. They do not bounce off the ionosphere (except in extreme circumstances), and so are limited to how far they can travel via groundwave. Under certain circumstances, atmospheric ducting can conduct FM-frequency radio waves further than normal, but due to the nature of an FM radio wave as compared to an AM radio wave, it's not an appreciable distance.\n\nOne of the coolest things I've done as an amateur radio operator is use a mode called "moonbounce". Quite simply, a large antenna array is pointed at the moon (usually 8-10 antennas on a frequency higher than FM commercial radio) and you transmit. Nothing is cooler than hearing your voice come back to you 3 seconds after you transmit (1-1/2 seconds to the moon, and 1-1/2 seconds back). Amateurs all over the world use this mode of operation to talk to each other. It really works!!\n\nAs for SETI, instead of transmitting, there are massive antenna farms set up around the world to listen in to space. The primary frequencies they listen to are around 1420MHz, because this is the primary harmonic frequency of hydrogen, which everyone knows is the most abundant material in the universe. They also listen to different multiples, or harmonics of this frequency, as well as tuning up and down the dial around those frequencies to compensate for Doppler shift. It makes more sense to listen than to transmit, because if there is intelligent life out there, and they are space-faring, you would think that they would've been broadcasting a lot longer than we here on Earth would (the first radio signal that had any chance of escaping our solar system in a readable form wasn't transmitted until the 1920s!).\n\nAny more radio questions, msg them to me; I've been a licensed radio amateur for 11 years and I'll try to answer as much as I can for you!