FJ Software

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.

Please search for it at Wikipedia - there you'll find the answer why a specific dB-Range gets in the negative range

FJ hat 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..

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.

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.

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.

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.

My k700:

100% - -51dB! (+46!)
77% - -97dB (-12)
58% - -85dB (-12)
39% - -73dB

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.

Hmm - ok you are right. I have changed it for the next version.

I think i said already enought