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{{short description|Device used to calibrate radio telescopes}}
{{more citations|date=November 2024}}
A '''radio noise source''' is a device that emits [[radio wave]]s at a certain [[frequency]], used to [[calibrate]] [[radio telescope]]s,<ref>{{Cite book |last=Joardar |first=Shubhendu |url=https://books.google.com/books?id=cjW_DgAAQBAJ&pg=SA1-PA21&dq=%22Radio+noise+source%22+calibration&hl=en&newbks=1&newbks_redir=0&source=gb_mobile_search&sa=X&ved=2ahUKEwi5v4Pn-ryJAxUPJNAFHcjcG-oQ6AF6BAgNEAM#v=onepage&q=%22radio%20noise%20source%20like%20that%20from%20electrical%22&f=false |title=Radio Astronomy: An Introduction |last2=Claycomb |first2=J. R. |date=2015-05-15 |publisher=Mercury Learning and Information |isbn=978-1-937585-62-4 |pages=1-21–1-22 |language=en}}</ref> such that received data may be compared to a known value, as well as to find the [[Focus (optics)|focal point]] of a telescope soon after construction, so that the [[wave guide]] and [[RF front end|front end]] may be properly located.
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