Jan 28, 1997

	COMMUNICATION SYSTEM AND ANTENNA POINTING SYSTEM
  Some hot items in comm and pointing (not in any particular order):
  (Status : 10 = done, 0 = not started)

	COMMUNICATION SYSTEM

2       Relay system procurement and assembly
1       Command truck equipment procurement and assembly
6	Satellite Contract
1	Landline
5       Satellite Equipment (Chile)
4       Satellite Equipment (USA)- Downlink Site
5       Satellite Consultancy
7       Arlans Testing
6       Radios Testing
4       Protocols
5       Transporting data from the relay station to the satellite truck
5       DGPS corrections to rover (via mux, ethernet ?)
6       Testing routers and stuff
7       Pointing Mechanism on rover
3       Pointing mechanism on relay station

Concerns

	- We have identified the protocols, but implementation is not
          clear/defined. 
	- Failures, redundancy (vs lead times/ cost)
        - Lack of experience with the satellite equipment. 
	- Radio operating in non-LOS mode.
	- RF Loss due to cables/connectors/RF rotary joint.

	POINTING MECHANISM

Status

7	Drivers for various sensors and Amplifiers
5	Software of Antenna pointing 
5	control algorithms for antenna pointing
5	Assembly of pointing cabling	
	

Concerns
	- Accuracy of compass in atacama due to magentic intereference
          from surroundings.
	- Redundany of the components (what is harmonic drives fail)?
	- Controller ?