Satellite Dish, LNB, and TV Aerial Installation and Repair

The “LNB” is the device at the end of a satellite dish arm and stands for “low noise block down converter”. Its job is to collect the signal from the satellite and convert the signal into a frequency that can travel down the cables with very little signal strength loss.

The ASTRA satellites transmit signals in two linear polarisations (Horizontal and Vertical). An LNB receives those signals, amplifies them, divides them into four sub-bands, converts them to a lower Intermediate Frequency (IF) band and passes it to the receiver. The receiver selects the appropriate sub-band by sending the relevant voltage (13 = V, 18 = H) and 22kHz switching tone to the LNB (tone on = Hi-band).

If you have poor picture quality or no picture at all and you believe the problem maybe the LNB and you have easy and safe access to your satellite dish the first thing you should do is to use a satellite signal finder connected to the first connection point available after the cables enter the property, this could be a loose lead with a plug on it or a socket fixed to a wall on the inside of the property.

Assuming you have already done this and you got no signal or a poor signal on the satellite signal finder and you have safe easy access to your satellite dish, you can now go outside to the satellite dish and disconnect any one of the cables from the LNB and connect the satellite signal finder in its place on the LNB, be careful not to move the dish. If you still get no signal then you need to replace the LNB, but if you do get a good signal at this point then you may need to change the cables leading down from the LNB to the first connection box in the property.

Source by David S Davis

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