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24. The 400 Mc./s. flux from Cassiopeia A

Published online by Cambridge University Press:  14 August 2015

Ch. L. Seeger
Ch. L. Seeger*
Affiliation:
University Observatory, Leiden, Netherlands

Extract

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The first trial of equipment designed for 400 Mc./s. absolute flux density measurement was completed just prior to this symposium. Using the midday sun, the gain of a 7·5 metre Würzburg (equipped with a TE°11 circular wave-guide feed) was found by comparison with an ‘optimum’ pyramidal horn of 20·2 square wave-lengths aperture. Cable losses and signal powers were measured against the available noise power from two co-axial resistors, one at ambient temperature and the other stabilized at the boiling-point of pure nitrogen.

Type
Part II: Point Sources: Individual Study and Physical Theory
Information
Symposium - International Astronomical Union , Volume 4: Radio Astronomy , 1957 , pp. 154
Copyright
Copyright © Cambridge University Press 1957 

References

1. Jakes, W. C. Jr. Proc. I.R.E. 39, 160, 1951.Google Scholar
2. Seeger, Ch. L. B.A.N. 13, 100, no. 472, 1956.Google Scholar