Deepak Bapna
Field Robotics Center
Carnegie Mellon University
Pittsburgh, PA 15213.

Phone: (412) 268-8158
Fax:   (412) 268-5895


Dear Mr. Hanawalt,

I called you this morning about slip rings for our application. We
need to point a high gain antenna (located on a moving vehicle) towards
a stationary receiver. We can pass the signal 2 ways:

	1. Pass RF signal through a slip ring. 

	   Frequency: 2.4-2.4835 GHz
           datarate: 4 Mbps 
           Power: 100 mW
	
	2. Pass ethernet through slip ring. In this case we locate the
           transmitter on the antenna pointing device. We need to pass
           the ethernet from the computer to the transmitter via slip
           rings.  
	  
           Following options are available on ethernet: 10Base2
           (thin/BNC) or 10Base5 (thick/AUI) or 10BaseT (Twisted
           Pair/RJ-45)

           The data rate is 4 Mbps. 

In addition we need to power the transmitter (18 VDC @1 Amp),  1
motor (approx. 25 W), get the sensory inputs from (encoder and tach
and send the motor control commands.

Following is the other information you need. Since we are still
designing the pointing device our specs are flexible. 
-------------
Bore Size: smaller the better (max. 3-4 inch)

Number of Circuits:

Amps and Voltage rating of each circuit:

RPM: 50 (max- not continuous rotation)

Environment:
	Temperature: -10 C to 50 C
	Humidity: 
	Type of atmosphere: (fairly clean)

Other (specific): We might need to use 2 slip rings, one dedicated to
                  ethernet.  
---------------

Please let me know if you need more information. 

Thanks

Deepak