RARR Antennas and Tracking
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| [[Image:RARR-VHF.jpg|left|thumb|RARR VHF antenna]] | [[Image:RARR-VHF.jpg|left|thumb|RARR VHF antenna]] | ||
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| The GRARR VHF and S-band antennas were driven by identical hydraulically-powered [[Tracking Antenna Mounts|X-Y mounts]] with digital angle encoders accurate to ±0.1°. | The GRARR VHF and S-band antennas were driven by identical hydraulically-powered [[Tracking Antenna Mounts|X-Y mounts]] with digital angle encoders accurate to ±0.1°. | ||
| The VHF antenna was a 8.4m (28ft) square array of cavity-backed slots operating about 150Mc. The array was later upgraded to backward-scatter dipoles. The antenna had a beamwidth of 16° and was often used as an acquisition aid for the narrower beamwidth S-band antenna. | The VHF antenna was a 8.4m (28ft) square array of cavity-backed slots operating about 150Mc. The array was later upgraded to backward-scatter dipoles. The antenna had a beamwidth of 16° and was often used as an acquisition aid for the narrower beamwidth S-band antenna. | ||
| [[Image:RARR-Sant.jpg|right|thumb|RARR S-Band antenna]] | [[Image:RARR-Sant.jpg|right|thumb|RARR S-Band antenna]] | ||
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| The S-band antenna consisted of twin 4.2m (14ft) parabolic dishes operating around 2500Mc with a beamwidth of 2.5°. One dish transmitted and the other received; the separation of transmit and receive functions decreased noise feedback on the receive dish. Both VHF and S-band antennas had 10Kw transmitters. | The S-band antenna consisted of twin 4.2m (14ft) parabolic dishes operating around 2500Mc with a beamwidth of 2.5°. One dish transmitted and the other received; the separation of transmit and receive functions decreased noise feedback on the receive dish. Both VHF and S-band antennas had 10Kw transmitters. | ||
Revision as of 02:32, 1 January 2007
- Antennas and tracking
- Telemetry and command
- Darwin sub-station
- Location Project
- Support highlights
- Mission Profile
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The GRARR VHF and S-band antennas were driven by identical hydraulically-powered X-Y mounts with digital angle encoders accurate to ±0.1°.
The VHF antenna was a 8.4m (28ft) square array of cavity-backed slots operating about 150Mc. The array was later upgraded to backward-scatter dipoles. The antenna had a beamwidth of 16° and was often used as an acquisition aid for the narrower beamwidth S-band antenna.
The S-band antenna consisted of twin 4.2m (14ft) parabolic dishes operating around 2500Mc with a beamwidth of 2.5°. One dish transmitted and the other received; the separation of transmit and receive functions decreased noise feedback on the receive dish. Both VHF and S-band antennas had 10Kw transmitters.
