January 3, 2006
ALMA Prototype Antenna Evaluation Overview
Evaluation Overview
7
Near-Field Radiometric
Holography System
±
Transmitter:
°
Photonically-generated
signal
°
50m high tower located
310m from antenna
±
Receiver:
°
79/104 GHz dual-receiver
system
±
10
m
m spec; 5
m
m goal
±
Gildas data analysis
(Lucas)
¥
Transmitter and receiver built by engineering group in Tucson.
¥
Transmitter contains a single photodiode directly coupled to a waveguide horn.