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 X-Y mounts with digital angle encoders accurate to &plusmn;0.1&deg;.+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 &plusmn;0.1&deg;.
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&deg; 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&deg; and was often used as an acquisition aid for the narrower beamwidth S-band antenna.

Revision as of 02:29, 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 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
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RARR 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.

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