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why are my signal bars innacurate?

Discussion in 'Android Devices' started by jrappy87, Dec 20, 2009.

  1. jrappy87

    jrappy87 Well-Known Member
    Thread Starter
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    Nov 10, 2009
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    SO it says 4 bars, but when i dial someone it goes down to 1 or 2 bars. Then when i hang up it goes back to 4. Then i go into about phone and it says -102 dBm, which does not equal 4 bars. SO why is it accurate only when i'm on a call?
     

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  2. Durkan

    Durkan Well-Known Member
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    Nov 5, 2009
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    Very simple reason for this. Your phone shows bar signals of the 3g network. When you use the phone you are seeing the voice bars because the 3g is not working at that time. You cannot use 3g/voice simulataneously like on GSM networks. This is normal to see for CDMA networks. GSM users dont notice this because the 3g/voice is connected at the same time, this is why you can surf and talk at the same time on GSM. Remember the old AT&T more bars in more places bragging? It was funny to me because the bars are really a poor judgement of signal quality. You could have full bars and be 115 db and not know it because of the 3g/voice simultaneous connections.
     
  3. ddarvish

    ddarvish Well-Known Member
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    Nov 9, 2009
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    which is also why all verizon dumb phones have signal bars for both 1X and also for EVDO but for some reason the smartphones dont which sucks
     
  4. MisterEff

    MisterEff Well-Known Member
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    Nov 25, 2009
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    I have about 87 dBm here in my house. That is a very bad signal, right?
     
  5. colnago

    colnago Well-Known Member
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    Nov 17, 2009
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    From what I understand, you'll typically see values between (-50) and (-100), with (-50) being "near ideal", and (-100) being "very poor".
     
  6. CRPercodani

    CRPercodani OFWGKTA
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    Oct 24, 2009
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    Real Estate Agent
    M A dub'l dolla sign
    -87 isn't that bad.
     
  7. jrappy87

    jrappy87 Well-Known Member
    Thread Starter
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    Nov 10, 2009
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    what about when i have wifi on still says 4 bars? and if i bring in a dumb phone the EV fluctuates between 2 and 3 bars but rarely 4 bars. my bro's blackberry has only 3 or 4 bars most of the time but again, rarely 5...and my blackberry storm's range was -80 to -110. -80 being 5 bars and -110 having 0 bars or no service. also doesn't 1x coverage usually extend beyond 3g? so why would i have 4 bars of 3g and 2 bars of 1x. :-?
     
  8. FrayAdjacent

    FrayAdjacent Well-Known Member
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    Dec 1, 2009
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    Austin, Texas
    -87dBm is not bad.

    The value is a ratio related to one milliwatt of power. Given it's a negative number, it's below that value. For every -3dB, the actual power is halved. So -3dBm is .5mW of power... and so on and so forth.

    So the more negative it goes, the weaker the signal strength.
     

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