i have dumped out the rssi <-> dBm maps from a few aironet cards.
They seem to be different (slightly) even between the same model of
cards. e.g. i hvae two 350s I bought at the same time, their MAC
addreses are very close, but they have slightly different maps. also,
of course the maps are different across models.
at least the map seems to be the same for the same card even after
inserting it and removing it several times.
perhaps each card is calibrated on the assembly line?
some sample data is at
http://pdos.lcs.mit.edu/~decouto/an-exp/340pci (pci card)
http://pdos.lcs.mit.edu/~decouto/an-exp/350-1 (350 card #1)
http://pdos.lcs.mit.edu/~decouto/an-exp/350-2 (350 card #2)
you have to negate the dm values for them to make sense.
Douglas S. J. De Couto decouto@...