Radio noise source

{{short description|Device used to calibrate radio telescopes}}

{{more citations|date=November 2024}}

A radio noise source is a device that emits radio waves at a certain frequency, used to calibrate radio telescopes,{{Cite book |last1=Joardar |first1=Shubhendu |url=https://books.google.com/books?id=cjW_DgAAQBAJ&q=%22radio+noise+source+like+that+from+electrical%22&pg=SA1-PA21 |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}} such that received data may be compared to a known value, as well as to find the focal point of a telescope soon after construction, so that the wave guide and front end may be properly located.