[kismac] Re: What does signal strength mean?

  • From: Rob Frohne <frohro@xxxxxxx>
  • To: kismac@xxxxxxxxxxxxx
  • Date: Sun, 17 Aug 2003 14:09:30 -0700

I would like to see a graph/table for signal in dbm, noise in dbm, and 
signal to noise ratio in db for both directions (to and from access 
point).  This percentage business is misleading.  There is no percent 
in it; it is in decibels relative to a milliwatt after the appropriate 
constant is added.  I haven't looked at Mick's code, but you have a 
good question.  Maybe he can answer it.  The docs for this are 
available from Intersil.

On Sunday, August 17, 2003, at 01:51  PM, Robert B.Peirce wrote:

> 150+.  Wow!  I have a NetGear 814 that produced 77 from its omni
> antenna a couple of inches away.  I replaced that with a panel antenna
> and it jumped to 92.  I thought that was pretty good.  What are you
> doing to get 150?  By the time I get to my office the signal is down to
> about 26 and the difference between the omni and the panel is down to
> about 4!  I got the panel hoping to boost the strength in my office but
> there must be too many walls in the way
> On Sunday, Aug 17, 2003, at 16:21 US/Eastern, Zac White wrote:
>> I think that is a good question. I don't know much about this but I
>> have gathered that the number isn't a percent. It is hard to make a
>> percent out of the signal strength because there is really no
>> limit...you could have 200 of the current scale. It really depends on
>> distance and strength of the AP. I personally have gotten 150+. So
>> basically, it is all relative.
>> On Sunday, August 17, 2003, at 1:09 PM, Robert B.Peirce wrote:
>>> I gather there is some meaning to the numbers and the differences
>>> between numbers, but this is not covered anywhere in the docs that I
>>> could see.  Is it all relative or is there some absolute meaning to
>>> them?
Rob Frohne, Ph.D., P.E.
E.F. Cross School of Engineering
Walla Walla College

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