How to make sure your LNB is still working

Tuesday, 1 April 2014  |  Ashley

The Low Noise Block (LNB) device on the end of a satellite dish receives the broadcast signal collected by the dish and transmits it to your satellite receiver through a run of coaxial cable. LNBs can degrade over time, particularly in locations exposed to extreme weather conditions; signs of a faulty LNB include missing channels, video pixilation, signal drop-out during heavy rain or a complete loss of signal.

How Do I Check A Satellite LNB?

To troubleshoot an LNB, first you should visually check the device and then test the signal levels with a satellite signal meter.

1. Switch off the satellite TV receiver and disconnect it from the main power supply outlet. Satellite receivers send a low voltage charge up the coaxial cable to power the LNB, so always disconnect the power before checking an LNB.

2. Go to the location of the satellite dish with steps, a ladder or a raised platform. Find the LNB unit on the end of the dish arm. The LNB is usually horn-shaped, cylindrical or rectangular.

3. Inspect the plastic casing that encloses the electronic components of the LNB. If the casing is warped or cracked, you will need to replace the LNB, because water ingress will have damaged the electronics inside the casing.

4. Slide down the cover of the coaxial cable connector’s joint with the LNB output jack, gently pull the cable to ensure that the joint is firm and secure. If the joint is loose, frayed or corroded, you will need to replace the connector and screw it back into the jack. If the LNB jack has rusted, you will need to replace the LNB device. If you can’t see any problems with the casing, output jack or cable connector, you can now test the output signal level.

5. Unscrew the existing coaxial connector on the down lead from the LNB’s signal output jack. Screw the supplied coaxial cable fly-lead into the input socket of a battery-powered digital-satellite signal meter. Screw the other end of the fly-lead into the output jack on the LNB.

6. Read the signal level on the signal meter. Displays vary by signal meter type, including dial displays, LED signal level indicators and LCD digital read-outs. No signal or a low signal strength/quality reading indicates that the LNB is not functioning correctly and you will need to replace the device. A medium- or high -strength/quality reading indicates that the LNB is working correctly and the fault lies somewhere else in your system.

Replacement Satellites And LNB's From Systemsat

If you are looking to buy an LNB but can’t decide which one is best suited to your satellite dish, then talk to one of our experienced experts. They will be more than happy to suggest and advise on which LNB will best fit your satellite dish depending on your specific needs. Systemsat have a large variety of products including satellites, LNB’s, aerials, cables, receivers and much more. We listen to our customer’s issues and requirements to ensure we provide the very best service. For more information or to speak to an advisor, please email or call us on 0203 411 2132.

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