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Dish pointing in FOB Endurance

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Posts: 12
Dec 7th, 2008 at 8:40am  
hello i have a hughes hn7000s modem and service through oifnet. They have given me the cordinance for set up. I have put everything in like they have instructed me to. Now i go to point the dish i can only get a reading of 10% signal strength. No matter how i much i sit and adjust it goes from 0-10 and thats it. any help?
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« Last Edit: Dec 7th, 2008 at 10:37am by Admin1 »  
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Eric Johnston
Senior Member

Posts: 2109
Reply #1 - Dec 7th, 2008 at 10:27am  
Use this page satellite dish pointing Iraq and the name/orbit location of the wanted satellite to verify your dish pointing angles.  You need to find the required azimuth (magnetic compass bearing), elevation angle (up/down) and the polarisation adjustment angle.

Set the elevation angle using the scale behind your dish.  Add 1 or 2 deg if it is sagging a bit, while the azimuth clamp is loose.  If no elevation scale then you need to make an inclinometer and apply this to some piece of metal that is at right angles to the beam direction.  If no such metal put the front face of the dish upright - the angle of the beam is now the same as the offset angle (see antenna documentation), then tilt the dish by an amount which will change the beam elevation to the required elevation.

Find out from your service provider what is the name of the downlink polarisation.  Set the polarisation to this nominal start position - vertical or horizontal.  Vertical polarisation is when the broad sides of the LNB waveguide are on top and underneath.  The LNB filter/sidearm will probably be sticking out sideways for vertical receive polarisation.   Having set the start position now apply the polarisation adjustment angle.  If the polarisation adjustment required is positive "+" then turn the feed clockwise, while facing towards the satellite, by the adjustment amount of degrees required.  If there is a tiny polarisation scale on the feed throat ignore any +/- or numbers.  The signs and numbers here may be backwards.  Simply use the scale tick marks to determine the amount of movement.  This setting needs to be done very accurately (+/- 1 deg) and with a small scale this is very difficult.  Putting an inclinometer sideways across the BUC may help.  Your VSAT hub may ask you to change this angle slightly so you don't interfere with other people.

Check the frequency and symbol rate again in your configuration.  The frequency is in units of 100 kHz, so check the number of zeros exactly.

Check that the coax cable from the LNB is actually connected to the SAT IN socket on the modem.  Always power off the modem at the AC mains wall plug before working on the cables.

Swing the dish boldly around the approx compass bearing and you will find the satellite on the first swing.  Centre it between the points where the modem loses lock, in azimuth and elevation and peak up, spending at least 30 minutes doing the peaking up. It really is important to get to the exact centre as the transmit beam is narrower than receive.

If no success, tell me all what the service provider has told you and also what model number LNB you are using.  Photos of your dish would be welcome.

Best regards, Eric.
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