Can not get lock on AMC12/NSS10/Telstar 11

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Ex Member

Ex Member

Nov 26^th, 2007 at 9:28am

Can someone please help me with how to get lock on AMC12 (skyvision) network satellite?

I am located in North-East of Nigeria, Latitude of 9.23, Longitude of 12.53 which gives me the azimuth of 262.314 with elevation of 31.583.

Guy, what would me my true elevation? I would also want to know the LO Frequency to use from the sat tracking, cus i was using 1150 but can not get lock.

Try and help me out guys.

Thanks

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Eric Johnston

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Reply #1 - Nov 26^th, 2007 at 11:33am

According to West Africa satellite Dish pointing your pointing details are:
Elevation 32 deg
Azimuth 264 deg (magnetic compass)
Polarisation +78 deg.

The Skyvision carrier is at 4000 MHz Horizontal.

Regarding polarisation: First set your LNB rotation so that it is true Horizontal polarisation. The broad faces of the rectangular LNB input waveguide will be on either side. Second: Adjust the angle. While facing towards the satellite turn the feed/LNB clockwise by +78 deg.

Regarding tuning: Your LNB local oscillator LO frequency is probably 5150 MHz. The frequency of the wanted carrier in the cable will therefore be 5150 - 4000 = 1150 MHz. (You are correct) If there is a "spectrum inverted" option in the modem configuration then tick it. Lyngsat shows the symbol rate at 26662 ksps and the FEC as 7/8

Best regards, Eric.

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Ex Member Ex Member	Reply #2 - Nov 26^th, 2007 at 4:48pm Thank you very much Eric, I think this will work fine... I will update you as soon as I am done with it (alignment & pointing). Have a nice day.
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