On Thu, 17 Feb 2005 11:13:42 +0000 (UTC),
(E-Mail Removed) wrote:
>Jeff Liebermann <(E-Mail Removed)> wrote:
>> someones computah just to identify them. Get a directional antenna of
>> some form. A 15 or 19 dBi dish antenna:
>> http://www.fab-corp.com/B1.htm
>
>Given the number of cards today that have external antenna connections,
>this isn't a great first suggestion. I'd just drive around without the
>external antenna. Very likely you could tell just from signal strength.
Yeah, I guess you could. It really depends on the neighborhood. If
you're facing a large apartment building with a substantial number of
windows, it's kinda difficult to determine which window with a dish.
It's impossible with just a laptop. However, in a neighborhood full
of single family dwellings, a simple drive-by should work.
Incidentally, one problem with the dish antenna method is that when
you get close, there's often more signal going directly to the exposed
part of the PCMCIA cards internal antenna, than through the dish. I
have to wrap the antenna section of the card in aluminium foil to
prevent this problem.
I was thinking of designing a mobile wi-fi direction finder
contraption that is mounted on the roof of a vehicle. Probably a
mechanically rotating directional antenna coupled to a PPI (plan
position indicator) type of "radar like" display on a laptop. I was
also considering a hand held "homer" type of device, with a
left-zero-right indicator. However, a bit of marketing research
indicated that there was little interest in paying big bux for a
consumer version.
>And that presumes that the original poster has a laptop, which wasn't
>mentioned.
Assumption is the mother of all screwups. Doesn't everyone have a
laptop? I have about 6 laptops. All have dead batteries,
insufficient RAM, slothish CPU's, flakey keyboards, and various
internal defects. It's a fair assumption that if one is involved with
802.11 wireless type of networking, that one would own a portable
wireless device. I realize that it's possible for people to use
wireless for non-portable machines, but laptops were the original and
probably the most common application. Yeah, it's an assumption, but
methinks a fair one.
>Maybe a Kensington K33086 WiFi FINDER PLUS would be in order,
>althought I don't think I would care $24.95 worth about my neighbor's
>unsecured WAP. http://shop2.outpost.com/product/4292894
I borrowed one to see what it would do. The plus version would not
work with an 802.11g only (802.11b compatibility disabled) access
point. It worked just fine driving through a local strip mall that
has a mess of access points running through large glass windows.
However, when faced with the residential maze, it was useless. I had
to be practically on the front doorstep before it would detect
anything. The Proxim 7400 FHSS PCMCIA card "spectrum analyzer" I
purchased is better, but is really insensitive due to lack of SS
processing gain and synchronization. Best of the bunch is my "site
survey" contraption, which is a panel antenna and pre-amp mounted on
top of a 25ft telescopeing fiberglass tree pruning pole, which feeds a
butchered MMDS downconverter and eventually a borrowed spectrum
analyzer. Unfortunately, that attracts far too much attention from
the police. I was using it on top of a 3 story parking garage in
downtown Santa Cruz and got to meet some of the SCZ PD. They seemed
genuinely interested in what I was doing. I don't think that total
stealth in transmitter hunting is required. However, try not to be
too blatant and obvious.
>There's something about that fab-corp site, and the way different IE6
>"favorites" get saved. I go to Jeff's link, and the URL noted above does
>not show up in my address bar, just http://www.fab-corp.com/index.htm. But
>I am showing a page called "The Basement".
Yech, y're right. It didn't screw up like that in the past and would
always go to the correct page. I'll scribble the webmaster a
nasytgram. FireFox and Netscrape 7.2 do the same thing. If you look
at the bottom of the page source code, this note might be a clue:
"Please note that some javascript will not work due to
missing frames"
I'll see if I can find one of those cardboard monitor frames, with all
the keyboard shortcuts and hints. Maybe that will help.
>This site is haunted.
Web server exhorcism is becoming a respectable profession.
--
Jeff Liebermann
(E-Mail Removed)
150 Felker St #D
http://www.LearnByDestroying.com
Santa Cruz CA 95060 AE6KS 831-336-2558