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/iframe></center><br><br> <br><br> </center> </td></tr> </table> <center> <table> <tr> <td width="600"> <center><hr width="400"><font size="2"><b>The <a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a> Usenet Archive Feeds Directly<br>From The Open And Publicly Available Newsgroup<br>Sci.Electronics.Design<br><br>This Group And Thousands Of Others Are Available<br>On Most IS NNTP News Servers On Port 119.<br><br><a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a> Is NOT Responsible For Any Topic,<br>Opinions Or Content Posted To This Or Any Other<br>Newsgroup. This Web Archive Of The Newsgroup And<br>Posts Are For Informational Purposes Only.<br><br></b></font><hr width="400"></center> <center><font size="2"><pre><b> From: Ian Walker <Junque@127.0.0.1> Newsgroups: sci.electronics.design,sci.electronics.basics,uk.radio.amateur Subject: Re: How to check for a 50 or 75 ohm connector Date: Tue, 24 Dec 2002 22:30:18 +0000 Organization: none Message-ID: <oVj5BtM6$NC+Ewlx@newbrain.demon.co.uk> References: <thm90vof9eov5lgk2ehk7ml6ofafeli8oh@4ax.com> <Qe9N9.297$ka5.29936@newsread1.prod.itd.earthlink.net> <3E053579.AFE0BFDF@sympatico.ca> <4b8b0vg1dmaj0kpma1ft61kkau01b38tsg@4ax.com> <DsUj$MoocdB+EwaK@newbrain.demon.co.uk> <9j0c0vk06vfcjbbdqv68chaou7brd40sp3@4ax.com> <GVJyhbyc8iB+EwpJ@newbrain.demon.co.uk> <f9gc0volfj5rjbpu8su4il9gjpfv88jdde@4ax.com> <synII00m9kB+Ewvq@newbrain.demon.co.uk> <bjlc0vondv2ir9u2gbn3sleprruf52tqok@4ax.com> <$SRMgh+9L2B+EwOu@newbrain.demon.co.uk> <I6z3I$AdB4B+Ewr8@jmwa.demon.co.uk> <OKPAG6HLsAC+EwRo@newbrain.demon.co.uk> <kJ6MUFB1zLC+EwFb@jmwa.demon.co.uk> Reply-To: Junque <news@newbrain.demon.co.uk> NNTP-Posting-Host: newbrain.demon.co.uk Mime-Version: 1.0 NNTP-Posting-Date: Tue, 24 Dec 2002 23:00:52 +0000 (UTC) User-Agent: Turnpike/6.02-U (<LDnw9h773xp7yLP+dlhqiUFRK+>) In article <kJ6MUFB1zLC+EwFb@jmwa.demon.co.uk>, John Woodgate <jmw@jmwa.demon.contraspam.yuk> writes >I read in sci.electronics.design that Ian Walker <Junque@127.0.0.1> >wrote (in <OKPAG6HLsAC+EwRo@newbrain.demon.co.uk>) about 'How to check >for a 50 or 75 ohm connector', on Tue, 24 Dec 2002: >>In article <I6z3I$AdB4B+Ewr8@jmwa.demon.co.uk>, John Woodgate >><jmw@jmwa.demon.contraspam.yuk> writes >>>I read in sci.electronics.design that Ian Walker <Junque@127.0.0.1> >>>wrote (in <$SRMgh+9L2B+EwOu@newbrain.demon.co.uk>) about 'How to check >>>for a 50 or 75 ohm connector', on Mon, 23 Dec 2002: >>> >>>>In the special case of a >>>>transmission line XL = -XC for all frequencies of use. >>> >>>The mind boggles. >> >> >>Why? Have you done your calculus for this? > >Yes, but I'm not sure that differential calculus is necessary to explain >the boggle. A finite element method seems adequate. > >A uniform transmission line has a fixed inductance L per unit length >(which can be as short a length as you like) and a fixed capacitance C >per the same unit length. XL = wL, XC = 1/(wC) where w is the angular >frequency. So how can XL = -XC for all w? Try a little thought experiment (or a real one if you have a VNA) connect a length of 50 ohm co-axial cable to a co-axial 50 ohm termination and now measure the impedance presented to the open end of the co-axial line; for all frequencies below cut-off you will obtain a value of 50 +j0 ohm (or 50 +o degrees), if you perform the experiment then the readings obtained will depend on the uncertainties in the system. It can only present a non-reactive value if for all values of w if XL = -XC. If it did not then it could only be used a spot frequency with a specific length, if at all. Having demonstrated that finite analysis fails I regret to advise you the you will have to use the mathematics of the infinitely small. -- Ian G8ILZ </b></pre></font><hr width="650"><a href="http://www.cyber-spy.com/electo-index.html"><font size="3">Go Back To The <a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a><br>Usenet Web Archive Index Of<br>The sci.electronics.design Newsgroup</font></a><br><br></center></td><img src="http://cyber-spy.com/cgi-bin/livecntr.pl?0+1+unetsci" width="1" height="1" alt="The Cyber-Spy Toolkit - powerful internet spy software - live police scanners - usenet fbi secrets archive - newsgroup spy electronics archive - search engine spy tools - download TCST today!"> </tr> </table> </center> <center> <br><center><hr size="3"></center> <table width="100%" cellpadding="0" border="0" cellspacing="0"> <tr> <td align="left" valign="top"><small><b><i><a href="http://www.cyber-spy.com/index.html">Cyber-Spy.Com Live Resources</a></i></b></small></td> <td align="right" valign="top"><small> Copyright Alpha Omega Delta,<br> All rights reserved. </small></td> </tr> </table> <center><hr size="3"></center> <br><br> <br><br></center> </body></html>