Looking fo a H to H Motor greater than 80°
- Thread starter norman
- Start date
- Latest activity Latest activity:
- Replies 6
- Views 2K
- Status
That's nice. I want to be 21 again! -
When satellites are low in the sky for you, the apparent separation between adjacent birds gets smaller and smaller.
So, you reach a point of diminishing accuracy.
What you really want is one that goes from horizon to horizon. Also motor shaft rotation degrees does not equal degrees of the satellite arc. What you need to do is go to Lyngsat and find what your most easterly and most westerly viewable satellites are. then do a site survey where you are planning to mount your dish and see if they are truely viewable or not. Trees, hills, buildings all will block your signal. If you can not see a satellite, you will not receive the satellite and the earths curvature may block what you want to see. Also, just because you can see a satellite does not necessarily meen that it is transmitting in your direction. You may be outside of the satellites footprint or require an extremely large dish to get enough gain. Also as Anole poited out, adjacent satellite interference may be a great problem because adjacent satellites now appear to be very close to each other and your dish may not be able to diferentiate between them. Now enter your co-ordinates into a GAAPS (Global Automatic Antenna Positioning System or goto x) calculator and see how much motor shaft movement you really need.
It is a common misconception to believe that in order to cover the entire visible arc of satellites that one would need a motor with 180 degrees of sweep. To cover the entire arc of satellites from horizon to horizon, you will not need a +/- 90 (180 degree sweep). A 140 degree sweep will sweep the entire sky for most areas. If you need a few extra degrees, open the motor (SG2100 type) and remove the physical stops, adding approximately 10 more degrees.
To calculate the height above the surface required to view as much of the arc as possible from your location, here are a few calculations. http://www.wolfram.demon.co.uk/rp_horizon_distance.html
Oh, to live on a tall mountain surrounds by deep valleys! LOL!!!
To calculate the height above the surface required to view as much of the arc as possible from your location, here are a few calculations. http://www.wolfram.demon.co.uk/rp_horizon_distance.html
Oh, to live on a tall mountain surrounds by deep valleys! LOL!!!
Last edited:
Hey Brian, I know where that is!
Well maybe not too tall, but is 3000 feet above the valley to the south tall enough?
- Status
