RARR Antennas and Tracking

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{{SideMenuRARR}} {{SideMenuRARR}}
[[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 erected on identical hydraulically-powered X-Y mounts. Each had digital angle encoders accurate to &plusmn;0.1&deg;. The GRARR VHF and S-band antennas were erected on identical hydraulically-powered X-Y mounts. Each had digital angle encoders accurate to &plusmn;0.1&deg;.

Revision as of 02:21, 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 erected on identical hydraulically-powered X-Y mounts. Each had 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.

Transmitter power on both VHF and S-band antennas was 10Kw.

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