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LNBF faulty

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tearepa
Ex Member


Sep 21st, 2011 at 12:40am  
I just replaced an LNBF (linear Ku cheap DRO) because it was displaying a constant waveform on the spec an. graph, one that wouldn't change when I moved the dish even when it looked into the ground. Weather fine, no sun-outs, maybe it was dropped, excess Volts? but I'd like to know what causes this or why it shows this anomoly? The exact replacement is up and working.
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tearepa
Ex Member


Reply #1 - Sep 21st, 2011 at 4:24am  
I stand corrected, sun-outages over the weekend. But what happens to the lnb?
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Eric Johnston
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Reply #2 - Sep 21st, 2011 at 12:09pm  
Sun noise does not cause permanent damage to the LNB. It just causes very severe interference for a few minutes, each day, around the spring and autumn equinoxes, when the sun passes behind the satellite.

The LNB might have failed due to being dropped, causing the DRO pellet come loose.

Best regards, Eric.
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AOGreen
Ex Member


Reply #3 - Sep 25th, 2011 at 11:13am  
Kindly let me know? Are u using Idirect antenna pointing to track? If yes. Then make sure u use the same subnet as that of ur option file. I ve had the same issue once. The pointing screen was just less than 2volts.
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tearepa
Ex Member


Reply #4 - Sep 29th, 2011 at 2:35am  
No this is just a cheap LNBF, no iDirect equipment at all, I know what your talking about there I've suffered the same symptoms in iSite. This problem was the occurance of a static sine wave on a Rover Meter graph whilst the LNBF underperforming and way off target, I guess it's still amplifying the noise? I don't know enough about it to speculate further.(NB The owner says it wasn't dropped).
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vsat_new
Ex Member


Reply #5 - Oct 12th, 2011 at 10:28am  
check your LNBF with spectrum Analyzer.
Compare the receive level with the new LNBF.
If the level of old LNBF is drop. try to increase the level with line amp.

thanks.
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