RARR Antennas and Tracking

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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 on 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&deg;. 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 on around 2500Mc with a beamwidth of 2.5&deg;. 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 06:07, 1 January 2007

Goddard Range and Range Rate

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RARR VHF antenna
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RARR VHF antenna



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 on 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.

RARR S-Band antenna
Enlarge
RARR S-Band antenna


The S-band antenna consisted of twin 4.2m (14ft) parabolic dishes operating on 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.

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