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Jul 27th, 2006 at 12:06am
If the signal peaks up to 30 in a particular direction and then drops down again I would be confident you have found a satellite (or possibly the sun).
If your receive carrier frequency tuning, symbol and polarisation angle are correct then you have the wrong satellite. Try moving nearer south and up a bit to check the next satellite and so on - or the other way and down a bit.
I would advise checking the tuning, symbol rate and polarisation angles. Then set elevation really accurately using the dish scale and sweep the dish boldly across in azimuth. Only when you pass the correct satellite will the level will go above 30. Figures up to 30 are just power measurements which might arise from any source, such any satellite. Figures from 30 upwards relate to wanted carrier signal quality, which is not the same thing as noise power.
If your polarisation is in error by 45 deg you might be pointing at the correct satellite and wanted carrier and get the full wanted power (comprising half the wanted carrier plus half the interfering cross-pol signal) but with zero signal quality. i.e. C/N ratio= 0 dB ! Best regards, Eric.
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