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Line 1: {{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~~last1=Joardar \|~~first~~first1=Shubhendu \|url=https://books.google.com/books?id=cjW_DgAAQBAJ&~~pg=SA1-PA21&dq~~q=%~~22Radio~~22radio+noise+source+like+that+from+electrical%22~~+calibration~~&hlpg=~~en&newbks=1&newbks_redir=0&source=gb_mobile_search&sa=X&ved=2ahUKEwi5v4Pn~~SA1-~~ryJAxUPJNAFHcjcG-oQ6AF6BAgNEAM#v=onepage&q=%22radio%20noise%20source%20like%20that%20from%20electrical%22&f=false~~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}}</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. ==References==