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Old 02-17-2005   #1 (permalink)
epultar
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Signal Rating in NetStumbler
Hello,
I've created a map using NetStumbler data that I exported to text then extracted out the SIGNAL column. My signal values ranged from 54 to 91. Is this a percentage of maximum signal strength ranging from 0-100%? I want to know what units I should say my values of 54-91 are. Any help would be much appreciated, thanks! :-)

-EdwardPultar.com
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Old 02-17-2005   #2 (permalink)
Dutch
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Quote:
Originally Posted by epultar
Hello,
I've created a map using NetStumbler data that I exported to text then extracted out the SIGNAL column. My signal values ranged from 54 to 91. Is this a percentage of maximum signal strength ranging from 0-100%? I want to know what units I should say my values of 54-91 are. Any help would be much appreciated, thanks! :-)

-EdwardPultar.com
It's whatever arbitrary value that your wireless NIC reports its signal strength in.
Do a search on signal strength.

Dutch
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Old 02-17-2005   #3 (permalink)
streaker69
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Quote:
Originally Posted by Dutch
It's whatever arbitrary value that your wireless NIC reports it's signal strength in.
Do a search on signal strength.

Dutch
I think he means what unit he should assign to those values, db or dbm.
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Old 02-17-2005   #4 (permalink)
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Quote:
Originally Posted by streaker69
I think he means what unit he should assign to those values, db or dbm.
Ahh.. AFAIR it's dBm, as it's the received signal strengths.

Dutch
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Old 02-17-2005   #5 (permalink)
epultar
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Ok so it's dBm? I saw an article that said I need to subtract 149 from each value to get dBm. So would that mean my 54 becomes -95dBm and 91 becomes -58dBm? So does that still mean the 91/-58dBm is a higher and better signal rating? Let me know if I'm thinking right here, thanks again! :-)

-Edward.
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Old 02-17-2005   #6 (permalink)
streaker69
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Quote:
Originally Posted by epultar
Ok so it's dBm? I saw an article that said I need to subtract 149 from each value to get dBm. So would that mean my 54 becomes -95dBm and 91 becomes -58dBm? So does that still mean the 91/-58dBm is a higher and better signal rating? Let me know if I'm thinking right here, thanks again! :-)

-Edward.
Any time you're dealing with negative numbers as you approach Zero, the value is greater. Therefore -50 is greather than -90.
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Old 02-17-2005   #7 (permalink)
Dutch
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Quote:
Originally Posted by epultar
Ok so it's dBm? I saw an article that said I need to subtract 149 from each value to get dBm. So would that mean my 54 becomes -95dBm and 91 becomes -58dBm? So does that still mean the 91/-58dBm is a higher and better signal rating? Let me know if I'm thinking right here, thanks again! :-)

-Edward.
Correct on the 149, and read the WiFi General information FAQ in the Faq section, for a much better explanation by Marius on receive sensitivity, than I can provide.

Dutch
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