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Question about signal quality

  • 16-11-2008 04:27PM
    #1
    machiavellianme
    Registered Users, Registered Users 2 Posts: 13,275 ✭✭✭✭


    Hi,
    I have the Ferguson FTA kit and all was working well for the past year until recently I've lost all channel reception. Tried rescanning and realigning the dish but to no avail. I'm getting 80%+ on signal strength but quality is 10% or less (on the screen). It was never much more than 60% to begin with but I'm guessing 10% is too low. What could be the cause of the problem? The cable seems ok as does the box so could the LNB be the issue?


Comments

  • #2
    Tony
    Registered Users, Registered Users 2 Posts: 11,346 ✭✭✭✭Tony


    Most likely dish alignment but could also be the lnb

    https://satellite.ie/



  • #3
    watty
    Registered Users, Registered Users 2 Posts: 32,451 ✭✭✭✭watty


    LNB or Dish alignment.
    80% sounds like you pointing at a house or wrong satellite.


  • #4
    machiavellianme
    Registered Users, Registered Users 2 Posts: 13,275 ✭✭✭✭machiavellianme


    Thanks for the quick responses guys, I'll try aligning it again so (there are no other houses/trees nearby so its either the wrong satellite or a fault). Failing realignment, I'll have to try a new LNB.


  • #5
    machiavellianme
    Registered Users, Registered Users 2 Posts: 13,275 ✭✭✭✭machiavellianme


    Just a quick follow up.
    Ive come to the conclusion it must be the LNB thats had it and was wondering if any brand or type is particularly better than others when I'm looking for a replacement?


  • #6
    bmaxi
    Closed Accounts Posts: 3,859 ✭✭✭bmaxi


    watty wrote: »
    80% sounds like you pointing at a house or wrong satellite.

    I've never understood that. Why should that be? I have 95% signal strength on mine and I'm not pointing at the wrong satellite or at a house. I've seen others that have only 70% signal strength and perfect reception, most confusing.


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  • #7
    Fat_Fingers
    Registered Users, Registered Users 2 Posts: 1,245 ✭✭✭Fat_Fingers


    Signal strength is a measure of the received power.
    Signal quality is an measure of signal to noise ratio, or inverse measure of the bit error rate.

    In this respect quality is far more important than strength, as it determines if the signal is decodable. Below a certain threshold too many errors will occur for the built in error correction to cope with and you will get drop outs, picture breakup and sound glitches.

    However, the two are linked. A long cable run for example will decrease strength, and also increase noise especially if poor quality cable is used. Therefore quality will also drop.

    LNB skew (what angle the LNB is twisted at with respect to the dish) can have a marked effect on received quality for a correctly aligned dish.


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