Title :
A Maser Amplifier for Radio Astronomy at X-Band
Author :
Giordmaine, J.A. ; Alsop, L.E. ; Mayer, C.H. ; Townes, C.H.
Author_Institution :
Dept of Phys., Columbia University
fDate :
6/1/1959 12:00:00 AM
Abstract :
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 determining the sensitivity of such devices is presented.
Keywords :
Bandwidth; Laboratories; Low-frequency noise; Masers; Noise figure; Noise measurement; Preamplifiers; Radio astronomy; Temperature; Voltage;
Journal_Title :
Proceedings of the IRE
DOI :
10.1109/JRPROC.1959.287134
