andyb2
11-26-2009, 11:59 PM
This is a c/p sorta of a I believe Grandpooba from another site.
This is a simple tool that will help you survey a prospective site for obstructions. This will work to survey a site and compensate for the 22 degree dish offset. It projects a laser beam in the direction of the satellite, so you can see if there are any obstructions.
22-degree signal offset:
This is very important to you if you are surveying a prospective dish site. The dishes are manufactured with a 22-degree signal offset. This means if you put the face of the dish vertical (90 degrees to the horizon), the signal would be coming in at 22 degrees above the horizon. I have seen dishes on a dwellings, mounted on the lower edge of a roof and the dish appears to be aimed into the roof but because of the 22 deg offset, was shooting over the peak of the roof.
CONSTRUCTION:
Needed: the dish you are installing, a "torpedo" level, a 6 inch 2X4 wood block, a bunge cord or rubber bands.
Start with a LEVEL and plumb pole, using the Torpedo level, place it along side the dish mounting pole, the bubble must be between the lines on all sides of the dish pole's mounting area.
Mount the dish on the level pole, and snug the dish pole clamps so it will rotate, but not wobble. Remove the LNB from the dishes LNB arm.
Set the dish "Elevation" adjustment for exactly 45 degrees and lock the adjustments. (Picture #1)
Holding with your hand the 2X4 X 6 inch wood block against the dish LNB's arm, with the Torpedo level overlaided on the block and with the level's 45 degree bubble between the lines. With a pencil mark the block along the bottom of the level.(Picture #2)
Remove the block and carefully cut it along the marked lines. Once cut place it back on the LNB arm and place the torpedo level on the top, the 45 degree bubble should be between the lines.
Mount the laser pen (or flash Light) on the top of the angle block and secure them to the LNB arm with bunge cord or rubber bands. (picture #3)
TO USE:
Find on a satellite dish aiming site, the Elevation and magnetic Azmuth settings. Goto the prospective aiming site, level the mounting pole or tripod. Mount the dish on the pole with the wood block and laser pen on the LNB arm. Snug the dish pole clamps so it will rotate, but not wobble. Set the dish's elevation and using a magnetic compass aim the LNB arm to the magnetic azmuth(s). In the night, turn the laser pen on and sweep the azmuth 10 degrees to the right/left of the highest and lowest orbital positions of the satellites you desire. If the laser light does NOT contact any obstructions, the site is satisfactory.
This is a simple tool that will help you survey a prospective site for obstructions. This will work to survey a site and compensate for the 22 degree dish offset. It projects a laser beam in the direction of the satellite, so you can see if there are any obstructions.
22-degree signal offset:
This is very important to you if you are surveying a prospective dish site. The dishes are manufactured with a 22-degree signal offset. This means if you put the face of the dish vertical (90 degrees to the horizon), the signal would be coming in at 22 degrees above the horizon. I have seen dishes on a dwellings, mounted on the lower edge of a roof and the dish appears to be aimed into the roof but because of the 22 deg offset, was shooting over the peak of the roof.
CONSTRUCTION:
Needed: the dish you are installing, a "torpedo" level, a 6 inch 2X4 wood block, a bunge cord or rubber bands.
Start with a LEVEL and plumb pole, using the Torpedo level, place it along side the dish mounting pole, the bubble must be between the lines on all sides of the dish pole's mounting area.
Mount the dish on the level pole, and snug the dish pole clamps so it will rotate, but not wobble. Remove the LNB from the dishes LNB arm.
Set the dish "Elevation" adjustment for exactly 45 degrees and lock the adjustments. (Picture #1)
Holding with your hand the 2X4 X 6 inch wood block against the dish LNB's arm, with the Torpedo level overlaided on the block and with the level's 45 degree bubble between the lines. With a pencil mark the block along the bottom of the level.(Picture #2)
Remove the block and carefully cut it along the marked lines. Once cut place it back on the LNB arm and place the torpedo level on the top, the 45 degree bubble should be between the lines.
Mount the laser pen (or flash Light) on the top of the angle block and secure them to the LNB arm with bunge cord or rubber bands. (picture #3)
TO USE:
Find on a satellite dish aiming site, the Elevation and magnetic Azmuth settings. Goto the prospective aiming site, level the mounting pole or tripod. Mount the dish on the pole with the wood block and laser pen on the LNB arm. Snug the dish pole clamps so it will rotate, but not wobble. Set the dish's elevation and using a magnetic compass aim the LNB arm to the magnetic azmuth(s). In the night, turn the laser pen on and sweep the azmuth 10 degrees to the right/left of the highest and lowest orbital positions of the satellites you desire. If the laser light does NOT contact any obstructions, the site is satisfactory.