[no subject]

Joe,

I worked on periscopes which have a similar problem. They use a device 
called a slip ring assembly to pass signals from the stationary part of the 
periscope to the rotating part. The signals consist of analog control 
signals, DC power, and RF signals in the low GHz range. Do a Google search 
on "slip ring assembly" and you'll get a bunch of hits.

You might consider converting the parallel data stream to serial to reduce 
the number of connections needed. Another option would be to convert the 
parallel data stream to serial infrared. Then use a hollow drive shaft and 
send the infrared signals through the shaft. Try a Google search on 
"parallel infrared converter"

You could also use RF to couple the stationary and rotation parts. Put the 
antenna on the rotating part in the center so that it's orientation remains 
constant.

happy hardware hacking,
keith


-------------

Keith R. Watson                        GTRI/ISD
Systems Support Specialist III         Georgia Tech Research Institute
keith.watson at gtri.gatech.edu           Atlanta, GA  30332-0816
404-894-0836


</pre>
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