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		| Paper: | Measurement in Radio Astronomy |  
		| Volume: | 278, NAIC-NRAO School on Single-dish Radio Astronomy: Techniques and Applications |  
		| Page: | 81 |  
		| Authors: | Campbell, Donald B. |  
		| Abstract: | This lecture covers the fundamentals of observations with a filled aperture antenna, basic receiver systems and sources of noise. A simple derivation is provided for the radiometer equation, which determines a telescope's ability to detect radio sources. The lecture ends with a discussion of antennas as filters on the spatial Fourier components of the sky brightness distribution. |  
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