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wlserwis
Anmeldedatum: 26.09.2007
Beiträge: 17
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 Verfasst am:
Sa Okt 06, 2007 17:01 |
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Signal quality (in my t630):
19% -61dBm
23 -63
25 -65
32 -69
35 -71
39 -73
ect.
Strange...
Better signal in percent = lower in dBm...?
No, inversely! I'm sure. |
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FJ
Site Admin
Anmeldedatum: 15.02.2006
Beiträge: 31928
Wohnort: Tirol
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So Okt 07, 2007 09:02 |
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Please search for it at Wikipedia - there you'll find the answer why a specific dB-Range gets in the negative range |
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wlserwis
Anmeldedatum: 26.09.2007
Beiträge: 17
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So Okt 07, 2007 12:34 |
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| FJ hat Folgendes geschrieben: | | Please search for it at Wikipedia - there you'll find the answer why a specific dB-Range gets in the negative range |
Correctly is:
Lower signal - lower (more negative!) dBm and lower percent.
Higher signal - higher (less negative!) dBm and higher percent.
But MPE know somthing different, i see, hahaha 
Lower signal - higher (less negative!) dBm and lower percent!
Higher signal - lower (more negative!) dBm and higher percent!
See the difference? In MPE only indication in percent is correct.. |
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FJ
Site Admin
Anmeldedatum: 15.02.2006
Beiträge: 31928
Wohnort: Tirol
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So Okt 07, 2007 12:49 |
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| Zitat: | | Please search for it at Wikipedia |
Is there anything you didn't understand in this phrase ? Look at Wikipedia, there you'll see a list.
http://en.wikipedia.org/wiki/DBm
Also you can take a look at the developerguidelines of SE, there you'll see also some examples what means good signal and bad signal. |
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wlserwis
Anmeldedatum: 26.09.2007
Beiträge: 17
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So Okt 07, 2007 12:57 |
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Wiki says:
"3 dB decrease, the power is reduced by about one half, making −3 dBm equal to about 0.5 milliwatt."
0 dBm 1.0 mW = 1000 µW is better signal then −40 dBm (100 nW)! 10k* better!
If the power is reduced, signal is worse.
And Wiki have a point.
And i repeat: In MPE only indication in percent is correct. |
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FJ
Site Admin
Anmeldedatum: 15.02.2006
Beiträge: 31928
Wohnort: Tirol
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So Okt 07, 2007 14:31 |
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I'm not at home at the moment so i cannot reproduce the output. But i don't think that MyPhoneExplorer showed the last years always the wrong value and you are the first person which tells me about this. |
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FJ
Site Admin
Anmeldedatum: 15.02.2006
Beiträge: 31928
Wohnort: Tirol
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So Okt 07, 2007 20:13 |
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Hmm - ok you are right. I have changed it for the next version.
Still strange that this algo was used from the beginning on (about 3 years) and nobody realized that a wrong value is shown. |
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Gast
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Do Okt 25, 2007 13:11 |
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My k700:
100% - -51dB! (+46!)
77% - -97dB (-12)
58% - -85dB (-12)
39% - -73dB |
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wlserwis
Anmeldedatum: 26.09.2007
Beiträge: 17
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| Verfasst am:
Do Okt 25, 2007 18:22 |
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AT+CSQ
response:
+CSQ: <rssi>,<ber>
<rssi> Description
0 -113 dBm or
1 -111 dBm
2-30 -109 dBm to -53 dBm
31 -51 dBm or greater
99 Not known or not detectable
2-30 -109 dBm to -53 dBm - here must be the bad conversion (bug) in program!
-----------------------------------------------------------------------------------
30-2 = 28; 109 db - 53 dB = 56 dB; 56 dB/28 = 2dB step
rssi =
0 => -113 dBm or less (0% - poor signal)
1 => -111 dBm
------------------------
2 => -109 dB,
3 => -107 dB (= -109 dB +2 dB),
4 => -105 dB (= -107 dB +2 dB),
...... ect
30 =>-53 dB
-----------------------
and finaly:
31=>-51 dB or more (100% - superb signal)
Signal [dB] = rssi*2 -113
Thats all. |
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FJ
Site Admin
Anmeldedatum: 15.02.2006
Beiträge: 31928
Wohnort: Tirol
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| Verfasst am:
Do Okt 25, 2007 19:23 |
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| Zitat: | | Hmm - ok you are right. I have changed it for the next version. |
I think i said already enought |
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