[kismac] Re: Interpreting signal strength

  • From: Michael Rossberg <mick@xxxxxxxxxxxxxxxx>
  • To: kismac@xxxxxxxxxxxxx
  • Date: Tue, 6 Jul 2004 12:07:57 +0200

On 6. Jul 2004, at 10:32 Uhr, Ben Short wrote:

My understanding of the kismac signal strength is that it actually refers to the Signal to Noise (SNR) of the signal.

Work out what the noise floor is around the area (varies between -96dB and -104dB here), add the SNR to it
(eg kismac signal of 20 would give -76 db on a good day with the above noise floor), and you will have your
signal strength.

I do agree its a bit of a messy way of doing it though. Perhaps future releases could change this? (if there are
future releases ;))

well the problem is that the other programs are messy too ;). honestly we had this discussion: the cards give out a signal and a noise ratio. usually this signals are measured in dbm minus some calibration constant. for an example for some prism2 cards it is said to be 155 - but nobody i asked knew for sure. now kismac supports a wide range of cards and each does this conversion in mystic way. the easiest was to subtract these values and get an SNR in order to get the constants out. there are some cards that only return a SNR. now unless i am REALLY bored or someone else implements it, that is not going to change. sorry.


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