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Satellite Dish LNB Explained

What is an LNB? What does an LNB do? What sort do I need? We explain the basics of an LNB.

 

What is an LNB?

LNB stands for “Low Noise Block downconverter”, and is the box that sits on a pole pointing to the middle of a satellite dish. The LNB pulls in the satellite signal that’s reflected from the dish and sends it to a set-top box

Satellite Dish with LNB

Types of LNB

There are many different types of LNB out there – depending on the type of satellite dish and the satellite service you’re looking to get. On this page, we limit our discussion of LNBs to those that are used to get services in the UK from Sky Digital or Freesat.

Assuming we’re talking about Sky or Freesat, then the common types are single, dual, quad or octo Universal LNBs.

The difference here is the number of outputs that the LNB has. For instance, if you have two satellite TV boxes in your house, you need two feeds from the LNB – one for each box.

 

LNB Outputs

As we said above, each satellite receiver needs its own feed from an LNB. This picture shows a Quad LNB – an LNB with four outputs:

Quad LNB - with four outputs
Quad LNB – with four outputs

Twin Tuner boxes? Some satellite receivers, such as Sky+, Sky+HD and the Foxsat Freesat receiver, have two tuners – these let you record one satellite channel while watching a different satellite channel. This means that they need two feeds from the LNB, not one.

Sky+ HD Box
Sky+ boxes need two LNB connections

Before picking an LNB, you need to work out how many boxes you want to feed. The most you can feed is 8, using an Octo LNB. An Octo LNB will feed 4 twin-tuner boxes or 8 standard satellite boxes (or any combination).

 

My box has two sockets, but I only have one feed!

If you have a standard satellite receiver and want to switch to something like Sky+ or Sky+HD, you will find that your new box has two satellite sockets, but you may only have one lead coming from your dish.

To make full use of a box that has two tuners (e.g. record one channel while watching another), you need an LNB with two or more outputs, and two feeds from the LNB. If you’re ordering Sky+ or Sky+HD from Sky, they will replace your LNB if needed and run the second feed cable for you. Nothing for you to worry about. To order Sky+, or Sky+HD, go to sky.com/shop/tv

Q. Can I use Sky+ with only one feed? Yes, but you’ll not be able to use the full service. You won’t be able to record one channel while watching another, and some programmes that you set to record will fail if they record using the second dish feed

 

Can I split one satellite feed into two feeds?

This is a fairly common question. What should you do if you only have one feed from the dish, and two sockets on a box? Sadly, you can’t split a single feed from an LNB to let it feed two tuners at the same time.

Why? Satellite receivers send voltage and signals to the LNB to get the LNB to change frequency and ‘polarisation’ (some channels are Vertical and some are Horizontal). If you have two receivers both trying to switch a single LNB, one box will win, and one will lose.

You can get an LNB switch box that will let you switch your single feed to either of two receivers – just not to feed both at the same time. These are no substitute for having two dedicated feeds from the LNB though.


http://www.maplin.co.uk/Module.aspx?ModuleNo=9273&C=7018&U=RTlnb
Satellite Splitter from Maplin

http://www.maplin.co.uk/Module.aspx?ModuleNo=17808&C=7018&U=RTlnb

Satellite Switch Box from Maplin

 

 

Need an LNB, cables or connectors?

We recommend Maplin.co.uk.

 

LNB Problems?

Sometimes, but rarely, LNBs develop a fault. Typically, this may mean that you can’t get any channels, or you can only get channels from one polarity (Horizontal-only, or Vertical-only).

If you’re with Sky and can’t get your channels, call them for advice – they may need to come out and replace your LNB. Otherwise you can replace an LNB yourself. You can buy LNBs suitable for Sky and Freesat from Maplin.co.uk.

 

 

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17 Responses to "Satellite Dish LNB Explained"

  1. r johnston Says:

    living in Majorca spain have freeview but lost a lot of channels
    can you recommend a imb to regain lost channels yours sincerely r johnston

  2. gerard Says:

    Ok, Building on the above information.. I have a question…
    I had two sky boxes set up with each of them having the ability to record.. There are 4 lnb connections on the dish.
    These were set up as dual feeds (ie 2 LNB connections used per box for recording on another channel while watching a different channel)..
    My question is could I use the current LNB connections on the dish to power 4 “single feed” receivers (i.e: freeview boxes)
    instead of two dual feed sky plus boxes?..
    Note: Ive tried using one of these cables (that was used for recording on another channel) and I get a message saying “Signal Overload” on the freesat receiver, Think this cable is also connected to phone line, maybe I should disconnect the phone line and try again?…

  3. Isabel Says:

    Hi. In our new house we have a sat dish and aerial on roof. We currently use freeview but it’s useless. So I thought we could get a freesat box . We have 2 leads coming from dish but I bought a freesat box which only had room for 1 of these. Couldnt get any channels and I tried both leads. Do I need a box that accepts 2? I take it that means a freesat + hd box? Or should it still work with only one of these leads connected and there’s a different problem with dish?
    Any help appreciated

  4. hassan Says:

    I have 2 different receiver at 2 different rooms connected on one dish with double outcome lnb and 2 different wires, when i remove the tv wire from the socket in the bed room i had no signal in the other tv in the hall so what is the problem and why its connected together

  5. Peter Says:

    Do you need a special lnb for a portable camping or caravan satellite dish. If so what type do you need.

  6. Rumena Says:

    I have got the old sky box to connect to a new tv but dont have any cables with the sky box. Could someone please tell me what cables I need to connect it to my tv. And regarding the dish there is only one dish line I could me in my house. Do i need anymore line from the dish for the sky box to work.

    PLEASE HELP!!!!

  7. samir sheikh Says:

    Hello sir..

    I want to use Asiasat 7 @ 105.5° East in my home .. please explain me the procedures to install this satellite in my home. .
    Im from west bengal india.

  8. chris Says:

    no as long as the dish does not move it will work fine if its moving it will not work

  9. Gina Mohr Says:

    Do satellite dishes fail or need to be replaced for another reason?

    Thanks

  10. peter Says:

    I am in northern Italy and need to set lnb to minus 10/12 what does each segment of the lnb represent I have maxview 85cm modelmxl017/65&85

  11. hossam Says:

    Thank you for this explanation

  12. ABDELMAJEED ELFIKY Says:

    Discussion with a Christian: The Oneness of God is the message of Jesus and all the Prophets, peace be upon them
    أرسل لصديق
    Question :

    Why do you shun the truth and say that Jesus is only a Messenger instead of regarding him as the son of God? Jesus is the only son of the Lord and that is the truth!!.

    Answer :

    Praise be to Allaah.

    Thank you for giving us the opportunity to communicate and discuss the truth which we all need to know and follow, no matter what our previous differences of opinion and beliefs. It is only by means of this, I mean by knowing the truth and following it, that we can free ourselves of our sins, as it says in your Bible:
    “Then you will know the truth and the truth will set you free”
    John 8:31 – New International Version (NIV)
    So let us pause for a while and think about this truth, as it is stated in your Bible despite all the distortions and changes that have happened to it!
    The message that was brought by the Messiah (peace be upon him) was the call to worship God, the One, the Lord of the Messiah and the Lord of the worlds:
    “Now this is eternal life: that they may know you, the only true God, and Jesus Christ, whom you have sent”
    John 17:3 – NIV
    “A certain ruler asked him: ‘Good teacher, what must I do to inherit eternal life?’
    ‘Why do you call me good?’ Jesus answered. ‘No one is good – except God alone.’”
    Luke 18:18-19 – NIV
    “The devil led him up to a high place and showed him in an instant all the kingdoms of the world.
    And he said to him, ‘I will give you all their authority and splendour, for it has been given to me, and I can give it to anyone I want to.
    So if you worship me, it will all be yours.’
    Jesus answered, ‘It is written: “Worship the Lord your God and serve him only.”’”
    Luke 4:5-8 – NIV
    Believing in and worshipping Allaah alone, besides Whom there is no other god, is the greatest teaching brought by the Messiah, and it is the greatest teaching brought by all the Prophets.
    “One of the teachers of the law came and noticed them debating. Noticing that Jesus had given them a good answer, he asked him, ‘Of all the commandments, which is the most important?’
    ‘The most important one,’ answered Jesus, ‘is this: “Hear, O Israel, the Lord our God, the Lord is one.
    Love the Lord your God with all your heart and with all your soul and with all your mind and with all your strength.”
    The second is this: “Love your neighbour as yourself.” There is no commandment greater than these.’
    ‘Well said, teacher,’ the man replied. ‘You are right in saying that God is one and there is no other but him.
    To love him with all your heart, with you all your understanding and with all your strength, and to love your neighbour as yourself is more important that all burnt offerings and sacrifices.’
    When Jesus saw that he has answered wisely, he said to him, ‘You are not far from the kingdom of God.’ And from then on no one dared ask him any more questions.”
    Mark 12:28-34 – NIV
    But do not think that this advice was given to Israel or to his own people only. Rather this is the basis of the teachings of all the Prophets. The same advice appears in the Gospel of Matthew, in similar wording, after which he says:
    “All the Law and the Prophets hang on these two commandments.”
    Matthew 22:39 – NIV
    This belief in the oneness of God is indeed the message of all of the Prophets. Allaah says (interpretation of the meaning):
    “And We did not send any Messenger before you (O Muhammad) but We revealed to him (saying): Laa ilaaha illa Ana [none has the right to be worshipped but I (Allaah)], so worship Me (Alone and none else)”
    [al-Anbiya’ 21:25]
    This is the basic message to which the Messiah called people and warned them against differing from that. Allaah says (interpretation of the meaning):

    “Surely, they have disbelieved who say: ‘Allaah is the Messiah [‘Eesa (Jesus)], son of Maryam (Mary).’ But the Messiah [‘Eesa (Jesus)] said: ‘O Children of Israel! Worship Allaah, my Lord and your Lord.’ Verily, whosoever sets up partners (in worship) with Allaah, then Allaah has forbidden Paradise to him, and the Fire will be his abode. And for the Zaalimoon (polytheists and wrongdoers) there are no helpers”

    [al-Maa’idah 5:72]
    This is the basic principle on which we should all agree. Allaah says (interpretation of the meaning):
    “Say (O Muhammad): ‘O people of the Scripture (Jews and Christians): Come to a word that is just between us and you, that we worship none but Allaah (Alone), and that we associate no partners with Him, and that none of us shall take others as lords besides Allaah.’ Then, if they turn away, say: ‘Bear witness that we are Muslims’”

    [Aal ‘Imraan 3:64]

    It is alien to true Christianity, this futile attempt to reconcile the belief in the Oneness of God, which is the message brought by the Prophets, and which is clearly stated in their Bible, and affirmed in the Torah in particular, with their belief in the trinity.

    It says in the American Encyclopedia:
    The belief in the Oneness of God – as a theological movement – began at a very early stage in history, and in fact it preceded the belief in trinity by many decades. Christianity developed from Judaism, and Judaism firmly believes that there is one God.

    The path that led from Jerusalem (the home of the first disciples of Christ) to Nicea (where it was decided in 325 CE that Christ was equal to God in essence and eternal nature) can hardly be described as a straight path.

    The doctrine of trinity which was affirmed in the fourth century CE bears no resemblance to the original teachings of Christ concerning the nature of God. Au contraire, it is the opposite, a deviation from that teaching. Hence it developed in opposition to the belief in One God… (27/294).
    You can refer to the views of some of those Christians who still believe in the Oneness of God in the same American Encyclopedia, 27/300-301
    It is difficult to comprehend, so no wonder you were never able to comprehend it. But what is strange is that you believe in something that it is impossible to understand, unless we deceive ourselves and say that this understanding will come on the Last Day:

    “We understand that as much as our minds are able to, and we hope that we will understand it more clearly in the future, when the veil is removed from all things in heaven and on earth. But for now, the extent to which we do understand it is enough!”
    Yes, the truth will become perfectly clear to you in the future, as it is clear to us today, praise be to Allaah, on the Day on which Allaah will gather the Messengers and make them bear witness concerning their nations. Allaah says (interpretation of the meaning):
    “And (remember) when Allaah will say (on the Day of Resurrection): ‘O ‘Eesa (Jesus), son of Maryam (Mary)! Did you say unto men: Worship me and my mother as two gods besides Allaah?’ He will say: ‘Glory be to You! It was not for me to say what I had no right (to say). Had I said such a thing, You would surely have known it. You know what is in my inner‑self though I do not know what is in Yours; truly, You, only You, are the All‑Knower of all that is hidden (and unseen).
    117. ‘Never did I say to them aught except what You (Allaah) did command me to say: Worship Allaah, my Lord and your Lord. And I was a witness over them while I dwelt amongst them, but when You took me up, You were the Watcher over them; and You are a Witness to all things. (This is a great admonition and warning to the Christians of the whole world).
    118. ‘If You punish them, they are Your slaves, and if You forgive them, verily, You, only You, are the All‑Mighty, the All‑Wise.’
    119. Allaah will say: This is a Day on which the truthful will profit from their truth: theirs are Gardens under which rivers flow (in Paradise) — they shall abide therein forever. Allaah is pleased with them and they with Him. That is the great success (Paradise).
    120. To Allaah belongs the dominion of the heavens and the earth and all that is therein, and He is Able to do all things”
    [al-Maa’idah 5:116-120].

    Islam Q&A (www.islam-qa.com)

    أرسل هذه الرسالة الآن إلى غير مسلم

  13. Mickey Says:

    You are having a laugh aren’t you?
    This is a discussion about sat TVs not religion ffs!

  14. rot Says:

    Hello, I have a problem.

    I have a DualFeed-quadLNB-block installed and used it with free-to-air receivers just fine, setting HotBird(13.0) with DiseqC B and Astra(19.2) with DiseqC A (this can not be changed, seems).

    Now, I subscribed to Sky (Italy) and they sent me their receiver, but seems like it wants HB(13.0) on Diseqc A and the 2nd feed on DiseqC B. There is no setting to change this in the decoder, so it’s not working.

    Now, my question…could I “open” the LNB and change the DiseqC cabling so that HB will use DiseqC A and Astra DiseqC B?
    Or should I simply buy another LNB, considering it’s like 15euros?
    I could find other “little boxes” that claim to do this, but seems like a new LNB is still the cheapest choice (unless I can modify the one I already own myself).

    Thank you for your time.

  15. Ahmed Says:

    Hi there how are you guys,my name is Ahmed from Oman,can I ask you same of questions?I am trying to get signal for the satellite Intelsat 906 position 16.0E beam EIRP:se zone frequency12577 H system dvb-s mpeg-2 SR-FEC:40700 3/4,this satellite focus in Eat Africa and me I am in middle east (Oman), so which LNB,OR RESEVER, I can use

  16. Ahmed Says:

    Hi there how are you guys,my name is Ahmed from Oman,can I ask you same of questions?I am trying to get signal for the satellite Intelsat 906 position 16.0E beam EIRP:se zone frequency12577 H system dvb-s mpeg-2 SR-FEC:40700 3/4,this satellite focus in Eat Africa and me I am in middle east (Oman), so which LNB,OR RESEVER, I can use end how size of sattelate dish?thank

  17. Jill Butler Says:

    Hi.

    I wonder if you can help me. I have a satellite dish installed (Spain). I had a dual lnb as I was running two set top freestat boxes.

    When my installer tried to run a 4 lnb as I wanted to add another set top box in another room and a further cable to my Humax box in order to be able to record and watch programmes at the same time. He could not lock the signal in using the 4 lnb. As soon as he replaced the 2 lnb it worked fine. He actually moved the dish in order to try to get a better signal also. Picture on certain channels were pixelling with the 4 lnb, but perfect with the 2 lnb. ]

    Any information to correct this would be most welcome. Thank you.

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