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Old 06-22-03, 02:05 AM   #1
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Signal Strength in dBm, whats good/bad

I have been using the trial of WinC to find the networks I need to use through-out the day. This combined with my Socket LP CF card, bring great results. I was wondering what is a good signal strength (dBm) and whats bad.

When I am really near my access point I get about -32dBm or more. When I walk away it gets down to -11dBM and I have seen other networks on my WinC display at -7dB.

My connection with my access point starts to disconect at about -11dBm. How can it only go to -11dBm when other access points in the area are receiving signal at -7dBm?! And with WinC it shows fill green (first square yellow) the whole time until it looses connection completely. I suppose this is not very accurate graphically.

So if you guys could answer some of these questions I would really appreciate it! I also noticed that I can maintain a connection (i.e.: Connect and start walking away) farther away then I can start a connection.

Thanks again guys!!!

-Rotz
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Old 06-22-03, 03:51 AM   #2
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I don't find these numbers to be very reliable ... In fact for me they are ass backwards ...

I'm a Communications Officer and work with satellite communications systems for the DOD ... dB is a measure of power ... For ever 3 dB increase in strength you effectively double your power and every 3 dB decrease you effectively cut your power in half ...

For instance ...
0dB = 1 watt
3dB = 2 watts
6dB = 4 watts
So for every 3dB increase you double your power

Now if your reading negative numbers your less than a watt in power (milliwatts)...
0dB = 1 watt
-3dB = 0.500 milliwatts
-6db = 0.250 milliwatts
-9db = 0.1250 milliwatts
-11dB = 0.0800 milliwatts
-32db = 0.00050 milliwatts
So you see the -11dB is a more powerful reading than the -32dB which is a lot less power ... So in effect you should loose lock at a lower dB number(-32) than you would at a higher dB number (-11) ...


So now the question comes to mind as why your reading more power the farther you get :crooked:
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Old 06-22-03, 04:36 AM   #3
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:)
If you're new to this it's hard to understand, but in fact it's quite easy!


And it's useful to understand, you can use it almost everyday in your life :)
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Old 06-22-03, 05:02 AM   #4
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care for a go, I would like to understand if you can expain it!!

At least explain why my AP can only get -11 why others can go to -7dBm.

If its hard to explain forget it. If anyone knows about WinC though that would be helpful!!

-Rotz
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Old 06-22-03, 05:18 AM   #5
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Quote:
At least explain why my AP can only get -11 why others can go to -7dBm.
Easy ... Their router/access point might be better than yours ... Other things effect the signal also ... Other RF devices in the area ... Do you have any 2.4ghz devices in your area (phones etc) ... Even the angle that the signal penetrates walls can effect its strength ...
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Old 06-22-03, 05:44 AM   #6
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Oh that makes sense then. The reciever I am using is in an awkward place where it never gets a clear shot to transmit. It all makes sense now!!

Thanks,

-Rotz
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