What are these angles all about

[guo248]

Hello experts
I have read through the manual of SG2100 motor. It mention to set motor elevation angle, then dish declination angle, and then dish bracket angle. What are all these angle all about and what is the final and true elevation angle of the dish toward the sky.This is confusion. Trees are all over the south side my yard. elevation angle is very important.
My latitude is 40.0247 north and longitude -83.0639 west
1- SG2100 DiSEqC Motor
2- WINEGARD 76cm KU band OffSet Stell dish
3- ASC321-2 Universal Digital Ready Ku LNBFs
Thanks for help
guo248

 

[PSB]

Set the motor to an elevation of 50deg. then set the dish to 24 deg. elevation then point the dish at your true south satellite.......

Latitude 40° 0.000'N Longitude 83° 0.000'W

Sat Name Sat Lng Az(t) Az(m) El Skew
-------------------------------------------------------------
*** Of Particular Interest ***

EchoStar 3 61.5W 148.5 155.5 38.7 -23.6
EchoStar 6 110.0W 218.4 225.4 36.0 28.4

EchoStar 8 110.0W 218.4 225.4 36.0 28.4
EchoStar 7 119.0W 228.5 235.5 30.8 35.0
EchoStar 5 119.0W 228.5 235.5 30.8 35.0
EchoStar 9/Telstar 13 121.0W 230.6 237.6 29.6 36.3
EchoStar 1 148.0W 253.3 260.4 10.3 47.2
EchoStar 2 148.0W 253.3 260.4 10.3 47.2
EchoStar 4 157.0W 259.6 266.6 3.5 48.9

DirecTV 3 81.8W 178.1 185.2 43.7 -1.4
DirecTV 2 100.8W 206.5 213.6 40.2 20.0
DirecTV 1R 100.8W 206.5 213.6 40.2 20.0
DirecTV 1 101.0W 206.8 213.9 40.1 20.2
DirecTV 4S 101.2W 207.1 214.1 40.0 20.4
DirecTV 6 109.8W 218.2 225.2 36.1 28.3
DirecTV 5 119.0W 228.5 235.5 30.8 35.0

*** All Satellites 61W - 160W ***

EchoStar 3 61.5W 148.5 155.5 38.7 -23.6
Rainbow 1 61.5W 148.5 155.5 38.7 -23.6
Brasilsat A2 (incl. 5.8 deg) 63.0W 150.5 157.5 39.3 -22.2
Brasilsat B2 65.0W 153.2 160.2 40.1 -20.2
Brasilsat B1 70.0W 160.2 167.3 41.8 -15.0
Nahuel 1 71.8W 162.9 169.9 42.3 -13.0
AMC 6 72.0W 163.2 170.2 42.3 -12.8
Galaxy 12 74.0W 166.2 173.2 42.8 -10.6
SBS 6 74.0W 166.2 173.2 42.8 -10.6
GOES 12 75.0W 167.7 174.7 43.0 -9.4
AMC 5 79.0W 173.8 180.8 43.5 -4.8
DirecTV 3 81.8W 178.1 185.2 43.7 -1.4
Nimiq 2 82.0W 178.4 185.5 43.7 -1.2
Brasilsat B3 84.0W 181.6 188.6 43.7 1.2
XM Roll 85.0W 183.1 190.1 43.7 2.4

AMC 9 85.0W 183.1 190.1 43.7 2.4

AMC 3 87.0W 186.2 193.2 43.5 4.8
Galaxy 11 91.0W 192.3 199.4 43.0 9.4
Nimiq 1 91.0W 192.3 199.4 43.0 9.4
Brasilsat B4 92.0W 193.8 200.9 42.8 10.6
Telstar 6 93.0W 195.3 202.4 42.6 11.7
Galaxy 8I (incl. 1.0 deg) 95.0W 198.3 205.3 42.1 13.9
Galaxy 3C 95.0W 198.3 205.3 42.1 13.9
Telstar 5 97.0W 201.2 208.2 41.5 16.1
Inmarsat 2 f2 (incl. 1.7 deg) 98.0W 202.6 209.7 41.2 17.1
Galaxy 4R 99.0W 204.0 211.1 40.9 18.2
DirecTV 2 100.8W 206.5 213.6 40.2 20.0
DirecTV 1R 100.8W 206.5 213.6 40.2 20.0
AMC 4 101.0W 206.8 213.9 40.1 20.2
DirecTV 1 101.0W 206.8 213.9 40.1 20.2
AMSC 1 101.1W 207.0 214.0 40.1 20.3
DirecTV 4S 101.2W 207.1 214.1 40.0 20.4
AMC 1 103.0W 209.5 216.6 39.3 22.2
Solidaridad 1 (incl. 2.8 deg) 103.5W 210.2 217.2 39.1 22.7
AMC 2 105.0W 212.2 219.2 38.5 24.1
G-Star 3 (incl. 11.5 deg) 105.0W 212.2 219.2 38.5 24.1
G-Star 1 (incl. 6.0 deg) 105.0W 212.2 219.2 38.5 24.1
MSAT 1 106.5W 214.1 221.1 37.8 25.4
Anik F1 107.3W 215.1 222.1 37.4 26.1
Anik E1 109.2W 217.4 224.5 36.4 27.8
DirecTV 6 109.8W 218.2 225.2 36.1 28.3
EchoStar 6 110.0W 218.4 225.4 36.0 28.4
EchoStar 8 110.0W 218.4 225.4 36.0 28.4
Anik E2R 111.1W 219.7 226.8 35.4 29.3
Solidaridad 2 113.0W 221.9 229.0 34.4 30.8
Morelos 2 (incl. 4.4 deg) 114.9W 224.1 231.1 33.3 32.2
XM Rock 115.0W 224.2 231.2 33.2 32.3
SatMex 5 116.8W 226.2 233.2 32.2 33.5
Anik E2 118.7W 228.2 235.2 31.0 34.8
DirecTV 5 119.0W 228.5 235.5 30.8 35.0
EchoStar 7 119.0W 228.5 235.5 30.8 35.0
EchoStar 5 119.0W 228.5 235.5 30.8 35.0
EchoStar 9/Telstar 13 121.0W 230.6 237.6 29.6 36.3
Galaxy 10R 123.0W 232.5 239.6 28.3 37.5
Galaxy 5 125.0W 234.5 241.5 27.0 38.6
Galaxy 9 127.0W 236.4 243.4 25.6 39.6
Telstar 7 129.0W 238.2 245.2 24.2 40.6
Satcom C3 131.0W 239.9 247.0 22.8 41.5
Galaxy 1R 133.0W 241.7 248.7 21.4 42.4
Satcom C4 135.0W 243.3 250.4 20.0 43.2
GOES 10 135.5W 243.7 250.8 19.6 43.4
AMC 7 137.0W 245.0 252.0 18.5 44.0
AMC 8 139.0W 246.6 253.6 17.0 44.7
Inmarsat 2 f3 (incl. 1.9 deg) 142.0W 248.9 255.9 14.8 45.6
EchoStar 1 148.0W 253.3 260.4 10.3 47.2
EchoStar 2 148.0W 253.3 260.4 10.3 47.2
TDRS 9 (incl. 7.4 deg) 151.0W 255.4 262.5 8.1 47.9
TDRS 10 (incl. 6.2 deg) 151.0W 255.4 262.5 8.1 47.9
EchoStar 4 157.0W 259.6 266.6 3.5 48.9

 

[SatelliteAV]

On the latitude scale of the motor mount set to your latitude .... 40 degrees or to the elevation of 50 degrees (90-40= 50). Look at the table on page seven of the manual and find 40 degrees in the "Your Site Latitude" column. Now locate the 23.7 degrees in the "Dish Bracket Angle" Column. This is the angle that you will set the dish elevation bracket.

(It is easier to install a motorized system if you have installed the dish without the motor in a fixed position and locate at least one satellite and scan channels into the receiver. You now will be familiar with the receiver and verify reception of the satellite that you will attempt to locate after mounting the motor.)

If you have a receiver with USALS activate and enter your logitutude and latitude then drive the motor to the satellite's position. Make sure that the receiver is either on an active transponder or on one of the channels that was scanned in during the fixed install. Rotate the motor on the perfectly plumb and level mast (pole mount). If you do not detect a quality signal, adjust the dish elevation one degree and rotate the motor on the post. Repeat until located.

Select a satellite on another portion of the arc and locate. The motor should accurately track the arc if two or three birds are located and peaked. Some installs will be performed where locating the first satellite yields great reception of the entire arc!

 

[guo248]

Thanks for the calculation. then what will be final elevation angle of the dish.
If it is 30 degree, the LOS will touch the top of the trees and if it is 40 degree, the LOS will be 3 -4 meters above tree.
guo248

 

[SatelliteAV]

The final elevation is listed on the Satfinder list that Peter supplied. Pick the satellite and look at the elevation listed. (I.E. 43.7 degrees for AMC 9).

Use a compass along with a protractor and a weighted string to eye the angle to any of the listed satellites.

Your dish is an offset design, so the apparent angle of the dish is lower than the actual angle that it is viewing.

 

[PSB]

The dish will actually be pointing at an elevation of around 43 deg. (on true south) Good question!

 

[PSB]

Beat me to it Brian : )

 

[guo248]

Got you. Now it is clear to me. Thank for help. What is EL skew and does it mean anything to my installation. Do not laugh on this question
Guo248

 

[PSB]

No laughs here! We all have been there, the skew is the position of the LNB in relation to the satellite in the sky, if you are pointing at your true south satellite (and using a motor) then the LNB should be straight up and down. Also have a look at the below PDF. as it will help a lot!

http://www.dmsiusa.com/documents/SG2100 easy manual.pdf