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No Signal Problem

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Ex Member

Feb 13th, 2011 at 10:29am  
I am new to this game having only recently acquired a satellite dish receiving system. I have assembled the dish, attached the LNB and connected the cable to the digital receiver (Chinese product from Quanzhou TDX Electronics Co Ltd) and hooked up to the TV. In gleeful anticipation I have been trying to locate appropriate satellites, twisting and turning the dish antenna all over the place (its a manual dish, by the way). Try as I might, the results are always the same - "No signal". Looking at the system screen on the TV, I managed to achieve signal strength of 85% but the signal quality maximum achieved is only 3%. Just what is the problem or is there anything I am doing wrong? All the other parameter stuff - LNB frequency, channel frequency, symbol rate, etc - I think I have set up correctly as per info from Lyngsat. But - No Signal!!! Can any body help or advise? Thanks
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Eric Johnston
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Reply #1 - Feb 13th, 2011 at 11:27am  
The bracket on the dish will have a scale for elevation angle. Note the readings.

Once you have found any satellite note the azimuth and elevation angles accurately so you can always get back to that satellite. Then note that all the other satellites are in a line across the sky, either way from the found satellite. If you are little north of the equator the line across the sky goes from east to west, up and down, via very high up at due south, like the path of the sun on 20th March 2011.

Step along the orbit looking at each satellite, recording the elevation angle on your scale until you come to the wanted satellite.

Use this http://www.satsig.net/maps/satellite-tv-dish-pointing-south-east-asia.htm to determine where to look.

When you are aimed at the highest satellite, due south of you, on same longitude as yourself, your LNB polarisation should be centered.

Assuming you are north of the equator, when you are aimed at a south easterly, lower, satellite, your LNB polarisation should be turned anticlockwise, as viewed facing forwards towards the satellite in the sky. When you are aimed at a south westerly, lower, satellite, your LNB polarisation should be turned clockwise, as viewed facing forwards towards the satellite in the sky.

You need to make large polarisation adjustments approaching -89 and +89 deg for extreme east and west satellites that are down near the horizon.
Best regards. Eric
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« Last Edit: Feb 14th, 2011 at 6:29pm by Admin1 »  
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