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Help with a simple question
Posted 28 September 2004 - 01:52 PM
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Posted 28 September 2004 - 03:43 PM
Sorry to be the bearer of bad news!
Posted 28 September 2004 - 04:23 PM
Posted 29 September 2004 - 12:32 PM
I am very new to this forum and don't yet have a grasp on all the terminology being thrown around (e.g. 121, 148,etc......)
The satellites used for satellite TV are in geostationary orbit at the equator. They are +/- 22,300 miles from the earth.
Geostationary means they are travelling thru space at the same speed the earth is rotating. This makes them appear "stationary" to us on the ground.
The numbers you see are their physical location in space, this is known as the "orbital slot".
If you get a compass and turn until you face 121 degrees, you will be facing the "121" orbital slot.
Check out this site to get a better understanding, and to see just how many birds are above your head
To curcumvent possable future confusion for ya.... If you see Ex. "105 tp 23". This is referring to the 105 satellite and a specific transponder (transmitter) on this satellite. Every satellite has multiple transponders capable of transmitting multiple signals (channels). Go here to get specific satellite/transponder information.
And smiles you'll give and tears you'll cry
And all you touch and all you see
Is all your life will ever be....
Posted 29 September 2004 - 02:07 PM
...If you get a compass and turn until you face 121 degrees, you will be facing the "121" orbital slot. ...
Wellll, that part isn't strictly correct. If the longitude of your location on earth exactly matches that of the satellite (e.g. 121 degrees west), then it will be due, true south (not necessarily magnetic south), at an elevation roughly corresponding to your latitude; straight up if you're at the equator, about 90 - 40 = 50 degrees if you're at latitude 40 degrees (north or south), and less than zero, or below the horizon, if you're at one of the poles. Any difference in longitude means the satellite will be lower in the sky, and will also be offset from true south; by something roughly proportional to, but not exactly the same as, the difference in longitude. This is the main reason you really need a special calculator, or the pre-calculated pointing angles by zip code from your receiver. Another potential snag is caused by multi-feed dishes.