Abstract
The characteristics of the radome-enclosed Haystack antenna have been evaluated as a radio-astronomical instrument. Important advantages of the radome enclosure are the high pointing precision it permits under all wind conditions, the rms pointing errors being 7 in azimuth and elevation, and the antenna surface tolerance (0.027 in rms) made possible by controlled environment. We searched for but failed to find any detectable radome effects as follows: pointing deviations, gain variations, noise granularity, and polarization effects. The principal electromagnetic effect of the radome is a reduction of aperture efficiency by an amount that varies from about 1 dB at long wavelengths to 2.8 dB at 35 GHz. The noise contribution is about 9\deg K at 8 GHz and 21\deg K at 22.2 GHz.
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