Alt-BEAM Archive
Message #07350
To: beam@sgiblab.sgi.com
From: Dorsey2001@aol.com
Date: Wed, 3 Nov 1999 16:22:26 EST
Subject: [alt-beam] Re: PBS - no Mark!
yeah I saw it last night...it was cool but no mark...I love those soccer bots
I didn't think about all the strategy that you could generate from soccer and
robots...WILD!
Matt
7351 Thu, 04 Nov 1999 10:10:16 +1100 [alt-beam] Re: directional antenna? beam@sgiblab.sgi.com Elmo A couple of things to note here.....
1) two dipoles using a Frequency Modulation can be made to "point" in a
particular direction. You will notice the radio stations and airports
tend to have "sets" of antennae. This is becase they want to transmit or
recieve a signal from a given direction. I am a bit rusty on the
workings of the scheme but i _think_ it was something like, you can
adjust the phase differences between the two antennae to get a more
directional signal.....i will have to look it up to be sure. The nice
thing about this scheme is that you can effectivly have a rotating
directional antennae without having to expend lots of power in actually
physically rotating it.
2) If you want to put antennae onto a beam sized robot then you will
need to work close to the centimetre or millimetre wave lengths. As
someone else mentioned before, this will mean that your antennae will
only have to be "cm" or "mm" long, rather than meters.
I am still having doubts about this whole idea though. I dont think that
we can come up with a circuit that switches fast enough to capture any
useful information. Not if the robots are within meters or less of each
other.
Elmo
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