Home |
Search |
Today's Posts |
|
UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
Posted to uk.d-i-y
|
|||
|
|||
Satellite Position Notation
I am trying to set up a dish for receiving satellite television.
I had assumed that I understood the meaning of, for example, 28.2 degrees East. I assumed that this meant 28.2 degrees east of north. Or possibly 28.2 degrees past east. But then, what can 122.2 degrees East mean ? I have hunted for an explanation but it seems to be regarded as being self-evident. Unfortunately, it is not self-evident to me. I would be grateful for elucidation from anyone. |
#2
Posted to uk.d-i-y
|
|||
|
|||
Satellite Position Notation
"lari" wrote in message ... I am trying to set up a dish for receiving satellite television. I had assumed that I understood the meaning of, for example, 28.2 degrees East. I assumed that this meant 28.2 degrees east of north. Yes Or possibly 28.2 degrees past east. No But then, what can 122.2 degrees East mean ? 122.2 degrees East of North! or 32.2 degrees East of East if you must. |
#3
Posted to uk.d-i-y
|
|||
|
|||
Satellite Position Notation
"lari" wrote in message
... I am trying to set up a dish for receiving satellite television. I had assumed that I understood the meaning of, for example, 28.2 degrees East. I assumed that this meant 28.2 degrees east of north. 28.2 degrees is the position of the satellite in its orbit relative to the Greenwich Meridian. The angle you have to point your dish at depends where you are. See http://www.satsig.net/ssazelm.htm alt.satellite.tv.europe is a more appropriate ng or uk.tech.tv.sky -- Michael Chare |
#4
Posted to uk.d-i-y
|
|||
|
|||
Satellite Position Notation
lari wrote:
28.2 degrees East. I assumed that this meant 28.2 degrees east of north. Not for geosynchronous satellite positions it doesn't. The numbers refer to lines of longitude (through the poles) and they're relative to Greenwich. 28.2°E is on a meridian somewhere towards the far end of the Med. I'm guessing an Arabic station? Obviously the satellites are all near the Equator in terms of lattitude. Assuming that you're in the UK your dish needs to point somewhat "leftwards" of a locally vertical meridian plane, but it's still mainly southwards. Stick it on a southern-facing wall, not eastern-facing. |
#5
Posted to uk.d-i-y
|
|||
|
|||
Satellite Position Notation
Andy Dingley wrote:
28.2°E is on a meridian somewhere towards the far end of the Med. I'm guessing an Arabic station? Obviously the satellites are all near the Equator in terms of lattitude. 28.2°E is the position of the Astra 2A, 2B & 2D satellites used by Astra and the satellites have to be directly over the equator. If they were not, they would wander north and south of the equator over a 24 hour period and need a sophisticated steerable dish to track them. The dish needs to point to a spot in the sky which is 28.2°E of the Greenwich meridian and 35,786 kilometers (22,236 miles) above the equator - finding this point is the clever bit! This link will work out the correct details for you: http://www.ses-astra.com/consumer/az...p?locale=en_GB Terry |
#6
Posted to uk.d-i-y
|
|||
|
|||
Satellite Position Notation
Terry wrote: 28.2°E is the position of the Astra 2A, 2B & 2D satellites used by Astra ... Whoops! That should have said "used by Sky"! Terry |
#7
Posted to uk.d-i-y
|
|||
|
|||
Satellite Position Notation
Terry wrote: Terry wrote: 28.2°E is the position of the Astra 2A, 2B & 2D satellites used by Astra ... Whoops! That should have said "used by Sky"! Terry One is looking south for the satellites, towards the equator. 28.2E is then more or less 28.2 degrees east (left) of south. You should be able to find more information than you need by googling etc. I recently set up a dish from scratch, pointed in roughly in the same direction as the neighbours dishes then used the digibox to get to the right satellite. |
#8
Posted to uk.d-i-y
|
|||
|
|||
Satellite Position Notation
adder1969 wrote:
I recently set up a dish from scratch, pointed in roughly in the same direction as the neighbours dishes then used the digibox to get to the right satellite. Sounds a bit hit-and-miss, aiming something smaller than a dustbin lid, at something about the size of a people-carrier which is more than twice as far away as Sydney is from London. |
#9
Posted to uk.d-i-y
|
|||
|
|||
Satellite Position Notation
On 17 Jan 2007 05:34:23 -0800, "Terry" wrote:
|Andy Dingley wrote: | | | 28.2?E is on a meridian somewhere towards the far end of the Med. I'm | guessing an Arabic station? Obviously the satellites are all near the | Equator in terms of lattitude. | | |28.2?E is the position of the Astra 2A, 2B & 2D satellites used by |Astra and the satellites have to be directly over the equator. | |If they were not, they would wander north and south of the equator over |a 24 hour period and need a sophisticated steerable dish to track them. | |The dish needs to point to a spot in the sky which is 28.2?E of the |Greenwich meridian and 35,786 kilometers (22,236 miles) above the |equator - finding this point is the clever bit! Quite easy really http://www.satelliteforcaravans.co.uk/bearings.htm when the complex maths has been done for you. -- Dave Fawthrop dave hyphenologist co uk Google Groups is IME the *worst* method of accessing usenet. GG subscribers would be well advised get a newsreader, say Agent, and a newsserver, say news.individual.net. These will allow them: to see only *new* posts, a killfile, and other goodies. |
#10
Posted to uk.d-i-y
|
|||
|
|||
Satellite Position Notation
On 17 Jan 2007 05:11:36 -0800, "Andy Dingley"
wrote: 28.2°E is on a meridian somewhere towards the far end of the Med. I'm guessing an Arabic station? No, 28.2 is the Astra constellation of satellites used for Sky etc Stick it on a southern-facing wall, not eastern-facing. There is enough adjustment in a minidish mount to go on either. As a rough guide the direction to face the dish is the same as the sun at about 1020 GMT so anywhere that is well illuminated by direct sunlight around that time can be a site for a dish. Note that this is only the horizontal direction and is on bearing around 145 degrees. The elevation (up/down) to the satellites is about 30 degrees. -- Cheers Dave. pam is missing e-mail |
#11
Posted to uk.d-i-y
|
|||
|
|||
Satellite Position Notation
Terry wrote:
If they were not, they would wander north and south of the equator over a 24 hour period and need a sophisticated steerable dish to track them. You can still use them with a static dish if they're geosynchronous, even if they're wobbling in the figure-8 you describe. Maybe not for TV, but certainly for some data services where a lower signal strength at the LNB is acceptable. As older satellites run low on station keeping fuel they often end up in such orbits, pensioned off to less obvious VSAT services. |
#12
Posted to uk.d-i-y
|
|||
|
|||
Satellite Position Notation
Andy Burns wrote: adder1969 wrote: I recently set up a dish from scratch, pointed in roughly in the same direction as the neighbours dishes then used the digibox to get to the right satellite. Sounds a bit hit-and-miss, aiming something smaller than a dustbin lid, at something about the size of a people-carrier which is more than twice as far away as Sydney is from London. Well it might be but I got mine done in about 5 minutes. The sky signal is very strong and you use the digibox to fine tune it. |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Goncz's Postulate in Compact Notation | Metalworking | |||
Bypass valve position | UK diy | |||
Boiler Position | UK diy | |||
Siting a satellite dish using satellite eclipse with the sun | UK diy | |||
Mid-Position 3 Port Valve - Hot Water (A) position & OFF - but HW flow to boiler? | UK diy |