GBT Status Update
17 November 2000
Major GBT outfitting milestones achieved since outfitting began on 2 October 2000:
- Receivers installed to date in the Gregorian Receiver Room include
- L-Band (1.15-1.73 GHz)
- S-Band (1.73-2.60 GHz)
- C-Band (3.95-5.85 GHz)
- X-Band (8.00 - 10.1 GHz)
- Ku-Band (12.4 - 15.4 GHz)
- K-Band (18.0 - 26.5 GHz)
- L-Band receiver cold and ready for use.
- Termination of essentially all control and power cables in the Actuator Control Room (27,000 wires). These connections allow the active surface of 2209 panels to be measured and controlled. The software that reads LVDT position sensors on the actuators has been tested.
- Servo equipment for control of the Az / El drives and the Prime Focus and Subreflector drives has been installed.
- All welded cryogenic tubing runs from the compressors on the Alidade structure (near ground level) to the Receiver Room (450 feet upstairs) completed.
- Fiber optic lines that carry control and IF signals to all principal locations (Servo Room, Actuator Control Room, Receiver Room) run and connected.
- Monitor & Control Bus installed in key locations.
Developments during week of 13 November:
- K-Band Gregorian Receiver installed (NRAO)
- Prime Focus 1 Receiver cryo lines "cold-trapped" in preparation for installation of the receiver on 28 November (NRAO)
- Kollmorgen motors for the Prime Focus boom arm and Gregorian Subreflector have been returned from the manufacturer and reinstalled (Lockheed-Martin = LM)
- Alignment of the elevation bullgear finished (LM)
- New elevation encoder mount and protective housing fabricated and installed (LM & NRAO)
- 10 of 20 active surface power supplies installed in the Actuator Control Room (NRAO)
- Resumed simulated pointing observations with Monitor & Control software.
- Installation of Prime Focus 1 Receiver (0.290 - 1.23 GHz) (NRAO)
- Azimuth track work (LM)
- Elevation and Azimuth servo tests (NRAO / LM)
- Continue punchlist work (LM)
- Install 10 remaining active surface power supplies
- Install holography reference horn
- Begin commissioning observations (NRAO) [expected 1 December 2000]
17 Nov 2000