(I've already put this in a different forum, but I'm not getting any replies) Hello! I'm trying to build a robot, and I'm working on the communications. Here's the application: a 60 pound robot being driven around, the farthest it would be away is around 1000 ft. Here's my question. Will WiFi work? I'd be using 802.11g, and I think I'd need extender antennas. If you think it would work, what products would you reccomend, both for the robot and the controlling computer. Thanks in advance! -- robowifi brought to you by http://www.wifi-forum.com/

robowifi <robowifi.1ldf6y@WiFi-Forum_dot_com> wrote:
1000 feet with omnidirectional antennas on a moving platform is going
to be pretty dicey.  If it's all outdoors, always line of sight, and
there's no significant interference it might work, but I wouldn't bet
my paycheck on it.

I'd look for the highest power bridges I could find with diversity
antennas, and maybe program in a "lost signal, back up a bit to
re-aquire signal" routine.  Disable encryption, etc...

You really want something in the VHF range for your data radios.

[Where are you located?]

On Fri, 04 Mar 2005 13:18:44 GMT, robowifi
<robowifi.1ldf6y@WiFi-Forum_dot_com> wrote:

Well, I can see why you didn't get any answers.

1000ft is going to be a problem.  All your robot has to do is go
around a corner and you've lost the signal.  Even if it could be made
to work at 2.4Ghz, you're going to have link problems due to
obstructions.  The robot will probably need an omnidirectional
antenna, but these have a fairly narrow vertical radiation angle.  Can
you insure that the antenna will remain vertical to within perhaps
+/-5 degrees of vertical?  Most robots cannot.  Also, your control
point might need a dish or panel antenna that somewhat tracks the
robot to withing about +/-15 degrees.  Is this practical?

How about some clue as to your bandwidth requirements?  Are you
belching video in which case you need at least 150kbits/sec thruput?
Is your control one way analog, in which case a model airplane radio
control will be sufficient?  If bi-directional, do you really need
802.11 performance, or will a 900MHz unit with perhaps 115Kbits/sec
thruput be sufficient (especially if it penetrates obstructions better
and has much longer range)?  Basically, I need to know what you're
sending, how much, how fast, and over what topography, to offer any
useful suggestions.

Also, are there going to be other robots (i.e. Robot wars style
competition) active at the same time that might use 2.4Ghz for either
802.11g or video?  If so, you might need to deal with an interference
problem.

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