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[Q] Geostationary and Geosyncronous

Blogs > Raithed
Post a Reply
Raithed
Profile Blog Joined May 2007
China7078 Posts
May 05 2008 00:14 GMT
#1
I don't really get it, I have Googled it and such but I still don't get it.

Geostationary remains in one place around the Earth's equator and goes up and down on it and not round the Earth, right?

Geosynchronous rotate around the Earth?

Someone who knows this, help?

B1nary
Profile Blog Joined January 2008
Canada1267 Posts
May 05 2008 00:30 GMT
#2
Geosynchronous means the same period as the earth's rotation, so one revolution every 24 hours. Geostationary orbits are perfectly circular geosynchronous orbits around the earth's equator.
micronesia
Profile Blog Joined July 2006
United States24644 Posts
May 05 2008 00:35 GMT
#3
The advantage of the former is that if you look up, it's always there! But yes that only works at the equator.
ModeratorThere are animal crackers for people and there are people crackers for animals.
jtan
Profile Blog Joined April 2003
Sweden5891 Posts
May 05 2008 00:40 GMT
#4
Every satellite orbits in a circle around the earth (or they might have elliptic orbit, but you want a circular obviously.

Then think what happens when the axis of rotation of the sattelite is other then the axis of rotation of the earth, if you look at a map of the earth it will look like its going in a kind of sine-wave, but in fact its just a circular orbit.

A geostationary satellite orbits the earth in 24 hours (in the same direction as the earth spins )
If you draw such a satellite on a world map it would only be a single dot. And yeah it would have to be on the equator.
Enter a Uh
Raithed
Profile Blog Joined May 2007
China7078 Posts
May 05 2008 00:40 GMT
#5
On May 05 2008 09:30 B1nary wrote:
Geosynchronous means the same period as the earth's rotation, so one revolution every 24 hours. Geostationary orbits are perfectly circular geosynchronous orbits around the earth's equator.

So if I look up right now, geosynchronous will be up there? For the bolded, it won't be but it rotates around the Earth's equator?
Freyr
Profile Blog Joined July 2004
United States500 Posts
May 05 2008 00:40 GMT
#6
So for example, if you were somehow able to extend a cable from the surface of the earth to a satellite in geostationary orbit, the cable would remain undistorted by the motion of the satellite. (Arthur C. Clarke discussed this phenomenon in one of his scifi books where he pioneered the concept of the space elevator)

Incidentally, if you happen to read the relevant wiki article it states that geosynchronous orbits have the same period as earth's sidereal period, which as I understood it meant the period of the earth's orbit around the sun (ie ~365 days). This is not correct, and as B1nary stated, geosynchronous orbit refers to an object completing 1 revolution around the earth in ~24 hrs.
Raithed
Profile Blog Joined May 2007
China7078 Posts
May 05 2008 00:49 GMT
#7
Okay. Thank you.

Another thing, I have a question about, not sure if you guys would know it:

A band-pass filter has a Q of 50 and a bandwidth of 6MHZ. Find the center freq ... I can't find the formula for it, except something like this: http://en.wikipedia.org/wiki/Band-pass_filter

Distinctly, I remember, isn't Fo = BW/Q so Fo = (6x10^3)/50 right?
micronesia
Profile Blog Joined July 2006
United States24644 Posts
May 05 2008 02:45 GMT
#8
On May 05 2008 09:49 Raithed wrote:
Okay. Thank you.

Another thing, I have a question about, not sure if you guys would know it:

A band-pass filter has a Q of 50 and a bandwidth of 6MHZ. Find the center freq ... I can't find the formula for it, except something like this: http://en.wikipedia.org/wiki/Band-pass_filter

Distinctly, I remember, isn't Fo = BW/Q so Fo = (6x10^3)/50 right?

I remember using those when I was playing with a sound board. Never did it quantitatively though! GL
ModeratorThere are animal crackers for people and there are people crackers for animals.
Raithed
Profile Blog Joined May 2007
China7078 Posts
May 05 2008 03:01 GMT
#9
Okie dokie, forget about that LOL. Telecommunications FTL.
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