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Article #6194Re: Where does snow come from?
From: Bill Panter
Date: Wed, 09 Sep 1992 13:42
Date: Wed, 09 Sep 1992 13:42
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In article <bu9im9.778@wang.com> djenkins@wang.com (Dave Jenkins) writes: >smckinty@sunicnc.France.Sun.COM (Steve McKinty - Sun ICNC) writes: > > >>The big radio telescopes operate their circuitry close to 0degrees, because >>they want to see the background noise from the universe. >I thought some small percentage (1%-5% ?) of the snow on your TV was >attributable to the background noise. Sure. It's about 1% for normal conditions. That is, the TV is at room temperature (300 Kelvin) and the universe is at 3 K. Of course it could be less than this if the receiver uses real-world components, increasing the locally produced noise..... -) Bill Panter
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Newsgroups: sci.electronics Path: arc1-ca.pugleaf.net!sparky!uunet!spool.mu.edu!darwin.sura.net!wupost!cs.utexas.edu!torn!cunews!revcan!micor!panter From: panter@micor.ocunix.on.ca (Bill Panter) Subject: Re: Where does snow come from? Organization: M.B. Cormier INC., Orleans (Ont) Date: Wed, 9 Sep 1992 13:42:17 GMT Message-ID: <1992Sep9.134217.3603@micor.ocunix.on.ca> References: <etxansk.715946468@garbod20> <18i088INNj74@grapevine.EBay.Sun.COM> <bu9im9.778@wang.com> Lines: 16