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General -90 plus dBm always

Discussion in 'Android Devices' started by BigBeefy, May 2, 2010.

  1. BigBeefy

    BigBeefy Well-Known Member
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    I am always at very low dBm levels while at home. I cant remember the last time I had a great signal at all. I have done all the *228 programming options and roaming upgrades. I have done a search on Verizon and checked the coverage map and I am in one of the best areas. Any ideas?

    I am on 2.1 .v3
     

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  2. LiverpoolsNo9

    LiverpoolsNo9 Android Enthusiast
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    Sounds like a defective phone. I would take it in and let them look at it.
     
  3. gruss

    gruss Android Expert
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    Maps are optimistic. Is this something that just started with the eris or all the time? -90 should be fine to talk. I average about 88 or so and never have issues @ home
     
  4. BigBeefy

    BigBeefy Well-Known Member
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    I always have a weak signal. I have a tower in my back yard. I should have full signal.
     
  5. lilbballer27

    lilbballer27 Android Enthusiast
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    What is consider a good singal? A higher or lower negative number? Right now I have -73dbm.
     
  6. smacky

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    I read the other day it was the closer to 0, the better. I dunno. I tried searching the internet for answers, but they're stupid. No one makes mention of ideal rates. Maybe it's all relative to carrier, phone, etc.
     
  7. karib

    karib Android Enthusiast
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    I typically get -88 to -90 with only 1 to 2 bars, but I'm able to make calls without issue.
     
  8. lilbballer27

    lilbballer27 Android Enthusiast
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    Ok thanks just wondering!
     
  9. OfTheDamned

    OfTheDamned The Friendly Undead
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    Technically -1 is a higher number than -100, so a "lower" negative number will always be better.

    -105 to -100 = Really bad
    -99 to -90 = Not great
    -89 to -80 = Pretty good
    -79 to -65 = Good
    Over -65 = Excellent
     
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  10. lilbballer27

    lilbballer27 Android Enthusiast
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  11. baarak

    baarak Lurker
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    dBm is a log unit, so yes, a less negative number actually means the signal is stronger, for instance a -50 dBm signal would be stronger than a -60 dBm signal. It's not likely to see higher than around -40 dBm in any real world environment, and you'd only see that very close to a cell phone tower.

    For a more technical explanation, any number in dB is actually just a relative quantity referenced to some established value. In the case of dBm, the reference value is 1 milliwatt. Mathematically, the relationship is 20*log(power in milliwatts) = power in dB; because a log function is involved, any input values less than 1 (typically, the power received by a cell phone is several orders of magnitude lower than a milliwatt) will result in a negative output. For example, if your phone is receiving a -80dBm signal, it's antenna is receiving .0001 mW, or .1 uW. An easier approximation is that for every 3 dB difference, the value in reference units changes by a factor of .707, so where -80dBm is .1 uW, -83 dBm is .0707 uW, and -77 dBm is .141 uW.
     
  12. 3ris

    3ris Member
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    could someone tell me how to find out my phone's dBm levels??
     
  13. pjwren13

    pjwren13 Well-Known Member
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    Menu, settings, about phone, network
     
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  14. BigBeefy

    BigBeefy Well-Known Member
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    Thanks for the responses guys, seems like it is only an issue at home. I am going between -62 and -65 dBm while at work.

    Verizon map must not show my area as a weak spot. The tower behind me must not be a Verizon tower either.

    Anyway, the phone is not defective. Thanks again.
     

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