802.11

[storm]

802.11

Roger, got your email saying you didnt get mine ! But when I replied to it I simply got a bounce back saying that your plusdsl address is not a valid address !

Have emailed you at the address on your profile.

Ed
http://www.teamstorm.comhttp://www.teamstorm.com

[roger_plant]

802.11

I have tried again with a corrected(?) address.

[roger_plant]

802.11

Jim, you dont have to use a robot, just put your system, including the output interface and servos (if you have got that far) into a pram and push it around a simulated arena.
See if the output or servos behave(s) properly or if it goes into failsafe mode too often.

[jim]

802.11

I was thinking that the motors in a robot would significantly affect the radio performance, what do you think?

[anukhet]

802.11

Andrew - these articles may be of great use to you as the goalposts may have now been moved with regard to standards, encryption and hacking etc.
http://www.vnunet.com/News/1153321http://www.vnunet.com/News/1153321
http://www.vnunet.com/News/1124574http://www.vnunet.com/News/1124574

[fluppet]

802.11

Thank you, Karoline - Ill have a read.

George Francis was making noises about experimenting with 802.11; Im hoping hell post a report. I dont really want to spend hundreds on a transceiver when I can get by with a 20 quid CF card... (Im not saying Rogers wrong, since I know hes an expert on these things, but the more experimental evidence the better.)

--
Fluppet

[roger_plant]

802.11

Jim, I dont think there is much chance of any robot drive motor motor affecting 2.4Ghz 802.11 transmissions.

[roger_plant]

802.11

Just to keep you updated, I have changed over to 802.11a at 5Ghz.
The 2.4 Ghz 11.g was interfering badly with my video transmissions on 2.4 Ghz, whatever the channels in use.
On my walkabout test, 11a had the same line-of-sight range as 11g, about 100 mtrs.
11a did not suffer from the link breaking while I was moving as did 11g (see previous post).
This would indicate that 802.11a is a better choice for moving robot control, and essential if you want to also use a video link from the robot.
The 11a link did break when a large bush was in the line-of-sight, 11g did not.
Only simple tests that need to be backed up by others but an indicator as to which system to use.

[fluppet]

802.11

Interesting. Thank you, Roger. I hope Ill be feeling richer at some point, and start my own experiments. (Im not intending to be a permanent vapourboteer.)

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Fluppet