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]]
		+	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°.
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		+	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.
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	[[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.
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		+	Transmitter power on both VHF and S-band antennas was 10Kw.

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Revision as of 02:19, 1 January 2007

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.

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.