ISSN:
1476-4687
Quelle:
Nature Archives 1869 - 2009
Thema:
Biologie
,
Chemie und Pharmazie
,
Medizin
,
Allgemeine Naturwissenschaft
,
Physik
Notizen:
[Auszug] These observations were made in September and October, 1962, with the 250-ft. telescope using a parametric amplifier (AIL Type 1930) and a radio frequency switch incorporating varactor diodes as switching elements which gave an overall system noise temperature of about 200 K. Crystal filters having ...
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1038/196563a0
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