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satellite? why must the centre of satellite orbit coincide with the centre of the earth? pls provide detailed answers much appreciate <3

RickB replied: "This is not the case. In fact, if the satellite's orbit is elliptical, the center of the ellipse most definitely does NOT coincide with the center of the earth. However, it is true that the plane of the orbit does always _contain_ the earth's center--perhaps that is what you were thinking of. The reason is that the force vector (the pull that the satellite feels) is always directed toward the earth's center. This means (according to Newton's laws) that the satellite's path must bend towards the earth's center too. This continual bending towards the center results in an elliptical path that contains the center. (That's as well as I can explain it without being mathematical.)"

gurn_bot replied: "The Earth is approximately a sphere, therefore its centre of mass is in the centre of the Earth. Newton's equations defining the force of gravity between 2 objects, define the distance between the objects as the distance between the centre of mass of the 2 objects. Therefore to calculate the force that keeps a satellite in orbit (gravity) you need to know the distance between the satellite and the centre of the Earth. I hope this helps, for more information see the website below:"

What type of satellite cable is required for HD box? There are RG6, RG59,PF100 etc satellite cables available. I have normal sky box connected to the dish. Do I need to upgrade the satellite cable when I get freesat HD box or sky HD box? I want to buy good waterproof satellite cable for HD.Suggestions for suitable cable type and where to buy in UK. Is the satellite cable in Wickes suitable? The Wickes helpline could not advise. There are cables with different prices.RG6 is much cheaper than PF100.So is there a difference in quality or durability?

R@mR@ider69. replied: "most cables come as standard anyway,they are designed to go outside,therefore water proof,i don't know about the actual cables you will need,but you could have a look on here for reference purposes,http://www.cables2u.co.uk/hdmidvi-c-49.html"

ctleng76 replied: "Whether the signal is HD or Standard it should not matter. The difference is in the box and the cables connected between the box and your TV. The cables you have should be waterproof regardless of Standard or HD. Cables that let water in will cause increased signal loss when it rains. Waterproof cables can make your system less susceptible to problems when it is raining."

What kinda dish network satellite would I need to use if I wanted to run four receivers? I have seen many online I need it to be an HD satellite cause one of the tv's is an HD tv. Will all the other receivers receive a signal if its an HD satellite and they're not HD tv''s? I seen the Dish network 1000.2 satellite its an HD satellite but it says only imports to 3 receivers so how would I be able to run a fourth?

fidollaho replied: "you will need a dish pro plus multi switch, " dpp-44 ". it will add four additional inputs. cost is around $150"

Physics Problem Satellites in Circular Orbits: What is the orbital speed of the second satellite? A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.70 X 10(to the 4th power) m/s, and the radius of the orbit is 5.25 X 10(to the 6th power) m. A second satellite also has a circular speed around this same planet. The orbit of this second satellite has a radius of 8.60 X 10(to the 6th power) m. What is the speed of the second satellite?

Ashwin replied: "here u have to apply keplers law p^2 is directly proportional to the r^3. here p is the time taken for 1 revolution & r is the radius of the orbit. so here p1^2/p2^2=r1^3/r2^3 u r given the speed of one . form there u can calculate p. u will get p from which u will b able to get speed of 2."

What is the orbital speed of the second satellite? A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.60 104 m/s, and the radius of the orbit is 5.40 106 m. A second satellite also has a circular orbit around this same planet. The orbit of this second satellite has a radius of 8.80 106 m. What is the orbital speed of the second satellite?

Pearlsawme replied: "V2 R2 = V1 R1 V2 = V1 R1 / R2 V2 = 1.6 X10^4 x 5.4 /8.8 V2 = 0.981 x10^4 m/s"

Jim P replied: "For the two satellites to both be in orbit around the same planet, their centrifugal forces (the forces tending to pull them off into space) must equal the gravity of the planet and must be the same. The centrifugal force is equal to their angular speed times the radius of their path. Therefore, (1.60 104 m/s) x (5.40 106 m) = Speed x (8.80 106 m) Solve for "Speed". Note: This assumes the radius of the orbit given is from the center of the planet, not from the surface of the planet."

How to add satellite & do blind scan in Truman satellite receiver? I bought a Truman satellite receiver. I am going to move to Malaysia soon. In Malaysia, I need to receive signals from other satellite. Could anyone tell how to add & delete satellite in Truman satellite receiver, and then do blind search or other simple satellite scan? Thanks in advance!

تب بخ بخ بخ replied: "this is confusing. if a satalllite is directed at another satallite, it would "steal" channels for the other sattalites, this always happened with us, in our roof there was about 9 sattalites. i suggest you read the manuel, is it an automatic one? like does it move by a remote control? sorry i don't know much about these things =S"

Can I install Satellite Dish if when my building has a contract with a Cable company? Hi, I've recently moved to a new apartment and would like to install a satellite tv in my apartment.But, I found out that my building managment company has an agreement with Time Warener Cable comany. Do I have the Rights to install Satellite Dish?

MW replied: "Odds are there should be something in your contract about it. If it doesnt say anything about putting a satellite dish on the roof or on the building, then I dont see why you couldnt do it. Alot of times in an apartment the satellite company might make you get the managements approval before installing it."

Floyd B replied: "You don't have any rights to put up a dish. You need the managements approval to install a dish. So you have to check with them to see what you can do. I think what you are thinking about as to Time Warner is that they had to agree to wire any building that some one wanted wired. This was part of the deal with the city to get the right to wire the city. An owner of a building may not be obligated to have just Time Warner."

lsu_tiger_in_dallas replied: "Yes you can install a satellite dish in your building despite a contract your landlord has with the cable company. Under the Telecommunications Act of 1996, which among other things, was passed to allow consumers choices for receiving video programming, sets standards for consumers to be able to install satellite dishes on their properties. The rules have been amended several times, each time giving more rights to consumers. In short: •A landlord or homeowners association cannot put unreasonable restrictions for installing satellite dishes •A satellite dish is effectively treated as a piece of patio furniture of same size and weight. For example, a landlord cannot require excess insurance for a satellite dish to be installed if they would not require the same insurance for something else that is going on a patio •The rule applies to "exclusive use" areas, i.e. areas to which only the tenant and tenant’s visitors would have access such as terraces, balconies, or patios. Common areas such as roofs or exterior walls are not considered "exclusive use" areas. •Unreasonable rules which place an undue burden on a consumer receiving satellite programming are prohibited. •Reasonable rules, such as those intended to prevent damage to property are allowable, provided that they are reasonable. There are certain legal recourses available to consumers if they are denied the right to install a dish, including filing a complaint with the FCC. For more information, read through the following: "Installing Consumer-Owned Antennas and Satellite Dishes" - "FCC, Information Sheet, Over-the-Air Reception Devices Rule" - In the end, however, the decision to install a dish may come down to how difficult it will be to do so. Legally, the landlord cannot make it difficult for you to put up the dish. If, however, it takes a legal proceeding to be able to install the dish, you'll have to decide whether it is worth it. Good luck!"

DrJale replied: "If you are the owner of your new apartment, than of course you can. The fact that your building has a contract with cable company doesn't mean that you don't have a right to switch to satellite TV. No one can force you to have cable TV if you don't want to. Previous answers should help you also. However, if you are renting your new apartment, you'll need a permission from the owner which, in that case, may be difficult to obtain. Since you are considering satellite TV, you may check out AllSat Dish Network Satellite TV provider: They have some interesting offers. Hope this helps! Best regards,"

Dipper replied: "Assuming you are in the United States, the FCC has regulations regarding Over-the-air reception devices. Landlords, Homeowner associations, and local ordinances cannot prohibit you from installing an antenna 1 meter in size or less (or any size in Alaska), as long as it is installed in an exclusive use area. An exclusive use area is a porch or balcony or other area that you have exclusive rights to. Places such as walls, roofs, sidewalks, etc. are considered common areas and not covered by the regulations. For more information:"

pcreamer2000 replied: "depends on your landlords requirements. In some cases as a renter you would be in violation of agreement.... in my own case as a home landlord.... you wouldnt have a choice. If the landlord (like in apt's) has cable options... often are discounted... in some cases cable is even free. My last apt had digital cable as a freebie. 1 minute ago - Edit - Delete Source(s): A lot depends on landlord... go ahead and chk. some may require you to not only pay for the sat setup & use but a fee to not use their cable, which in somess (around here ) is free anyway."

What is the biggest satellite dish that is available so I can catch a lot of channels from around the world? And If you have a satellite tv dish can the computer and internet help you to catch even more tv channels.How much it costs for a satellite tv package with US,Australian and all Asian pay tv and free to air channels? And can you catch a lot of tv channels from Australia if you are in Europe depending on your satellite dish and receiver?

But Why?? replied: "80 metres across, do you want that delivered?"

RICH replied: "You know the old expression, ' Size doesn't matter'.? Well, you don't necessarily need a 'larger' dish, but frequencies, LNA's, (Low Noise Amplifiers) are important, as well as equipment to move your dish to the different satellites.. You won't get them all, only what is in view of your dish. Specific angle and elevation are very important. It can be expensive. Most TV stations have that capability. They have a chart, and the dishes will automatically go to the wanted satellite, and channel on that satellite.!! A satellite can carry many channels, in many different formats."

wires replied: "You can only receive the satellites that you can "see". In other words, they need to be in direct line-of-sight. You won't be able to receive transmissions from any satellite that is beyond the horizon from your location. The lower in the sky, the more difficult it will be to receive because of extra interference and attenuation of the signal. There are a lot of satellites up, and many of them carry signals from other countries but I can't tell you what countries are available from which satellite or where they are located. I'm sure that subscriptions such as you mention would be very expensive and would require several receivers."

dunc1ca replied: "The larger dishes are the C-Band dishes. You can use them to pick up Ku-band stuff too but the focal point is small and your dish needs to be well aligned. These dishes normally go to 3 metres in diameter although larger ones are available for a much larger price. The TV satellites are all 36000 km above the equator in a geo-synchronous orbit (the stay above the same spot on Earth). You can not pick up satellites that are below the horizon. The satellites in your field of view will generally be about plus or minus 60 degrees of longitude from where you are. Also, satellites beam out the signal in a specific direction, so that even if the satellite is in the sky where you are, the signal will be too weak to receive. C-Band signals are usually very large in area. Ku-band can be as small as a few hundred kilometres across. Go to to see what satellites are available to you where you live. They also include beam maps."

jorgeqba replied: ""What is the biggest satellite dish that is available so I can catch a lot of channels from around the world? " I would say 12ft (3.6 meter) dish , is your best bet. Solid unperforated is better , but if it is the mesh type make sure the holes are smaller than the width of a pencil so you can receive Ku signals. "And If you have a satellite tv dish can the computer and internet help you to catch even more tv channels" Good question , and Yes the computer can help in several ways , by using the Internet to look at sites such as Lyngsat where you can find updated info on new frequencies and channels. Another useful tool using your computer as a receiver so you can watch Satellite TV in HD using your PC , even get some stuff others can't watch with their existing receivers. "How much it costs for a satellite tv package with US,Australian and all Asian pay tv and free to air channels?" Depending on where you live and if you can actually receive all those channels is the real question , In the U.S. we can't get Australian TV , so that shows you that location is important , You can probably spend several hundred dollars a month if you could subscribe to everything possible. Kudos to all those contributing , you really know your stuff. My favorite Satellite Forum is Satellite Guys U.S. We discuss True FTA , C-Band and Ku Band , DIY help and more, we have registered members from around the world."

A satellite is in a circular orbit 225 km above the equator of the earth. How many kilometres must it travel? A satellite is in a circular orbit 225 km above the equator of the earth. How many kilometres must it travel for its longitude to change by 78.2°? Assume the radius of the earth equals 6400 kilometres.

Dana M replied: "Add the altitude to the Earth's radius to get the radius of the orbit. Calculate the circumference of the circle, using 2*r*pi. Pi can be approximated to 3.14 Multiply that by 78.2/360, because there are 360 degrees in a circle."

guanotwozero replied: "It depends on the inclination of the orbit. Is it equatorial? Polar? Something in between? If it's equatorial, then you just need to work out the right proportion of the circumference. The proportion would be 78.2 / 360 Can you do the maths? (as it sounds like your homework :-) If it's an inclined orbit, you'd need more information about the inclination, ascending node and initial position."

Gene Pace G replied: "Yes,you can Find something at"

What do I need to install satellite radio to my satellite radio ready car stereo? I bought a satellite ready stereo system for my car (2007 Jetta). I heard that I have to buy an XM or Sirius Satellite Tuner. Is this true? If so, how and where?

Travis P replied: "You also have to subscribe to XM or Sirius satellite radio services."

jaydrouin replied: "If the car has a SAT button on it it means that it is satellite capable (Has an input plug in the stereo). What is needed is a wiring harness (plugs into the back of the radio to the receiver. The receiver (to get the signal) and an antenna... Factory parts with installation approx. $500.00"

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