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The design and operating characteristics of a maser radiometer for use in radio astronomy at 3-cm wavelength are discussed. The operating system which is described has a bandwidth of 5.5 mc and an input noise temperature, including background radiation into the antenna, of about 85?K. An rms fluctuation level of about 0.04?K is attained using an averaging time of 5 seconds. A discussion of the factors...
Radiation from the planets, Venus, Mars, and Jupiter, has been measured at a wavelength of 3.15 cm using the Naval Research Laboratory 50-foot reflector and a narrow-band radiometer. The apparent blackbody temperatures for Mars and Jupiter derived from the radio measurements agree reasonably well with the results of infrared radiometric measurements. For the case of Venus, the apparent blackbody temperature...
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