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## [Qucs-help] Transcalc error

 [Qucs-help] Transcalc error From: Howard Hutchins - 2010-01-22 01:54:31 ```Hi, Transcalc is optimistic by a factor of approximately 2 for conductor loss for the coaxial line calculation compared to bench and calculation by other methods. This issue may go back to a misinterpretation of formulas in some early publications where "D" was actually 2*D and "d" was actually 2*d. I propose that the D and d parameters (outer and inner conductor _diameters_) should actually be treated (renamed) as radii: For a line with a 10 mm ID outer conductor and a 3 mm OD inner conductor, giving "D" as 5 mm and "d" as 1.5 mm gives loss and resonator Q values that agree with what I'm seeing on the bench. For example, see/try the program Wcalc ( http://wcalc.sourceforge.net/ ) - Transcalc yields loss values that agree with Wcalc when I use radius values with Transcalc. Best Regards, Howard Hutchins ```

 [Qucs-help] Transcalc error From: Howard Hutchins - 2010-01-22 01:54:31 ```Hi, Transcalc is optimistic by a factor of approximately 2 for conductor loss for the coaxial line calculation compared to bench and calculation by other methods. This issue may go back to a misinterpretation of formulas in some early publications where "D" was actually 2*D and "d" was actually 2*d. I propose that the D and d parameters (outer and inner conductor _diameters_) should actually be treated (renamed) as radii: For a line with a 10 mm ID outer conductor and a 3 mm OD inner conductor, giving "D" as 5 mm and "d" as 1.5 mm gives loss and resonator Q values that agree with what I'm seeing on the bench. For example, see/try the program Wcalc ( http://wcalc.sourceforge.net/ ) - Transcalc yields loss values that agree with Wcalc when I use radius values with Transcalc. Best Regards, Howard Hutchins ```
 Re: [Qucs-help] Transcalc error From: Michael.M - 2010-01-24 18:33:29 ```Hello, indeed you are right! Many thanks for the hint. Unfortunately, I'm not active with Qucs anymore. Can someone else fix it? Regards, Michael > Hi, > > Transcalc is optimistic by a factor of approximately 2 for conductor > loss for the coaxial line calculation compared to bench and calculation > by other methods. This issue may go back to a misinterpretation of > formulas in some early publications where "D" was actually 2*D and "d" > was actually 2*d. > > I propose that the D and d parameters (outer and inner conductor > _diameters_) should actually be treated (renamed) as radii: > > For a line with a 10 mm ID outer conductor and a 3 mm OD inner > conductor, giving "D" as 5 mm and "d" as 1.5 mm gives loss and resonator > Q values that agree with what I'm seeing on the bench. > > For example, see/try the program Wcalc ( http://wcalc.sourceforge.net/ ) > - Transcalc yields loss values that agree with Wcalc when I use radius > values with Transcalc. > > Best Regards, > > Howard Hutchins > > > > > > > > ------------------------------------------------------------------------------ > Throughout its 18-year history, RSA Conference consistently attracts the > world's best and brightest in the field, creating opportunities for > Conference > attendees to learn about information security's most important issues > through > interactions with peers, luminaries and emerging and established > companies. > http://p.sf.net/sfu/rsaconf-dev2dev > _______________________________________________ > Qucs-help mailing list > Qucs-help@... > https://lists.sourceforge.net/lists/listinfo/qucs-help > ```
 Re: [Qucs-help] Transcalc error From: Stefan Jahn - 2010-01-25 08:37:41 ```Hello Mr. Hutchins, i put this item on my TODO list, though I cannot promise when to do it! Right now I am quite busy here... But it will be fixed in the next release definitely. Thank you very much for pointing this out. Best regards, Stefan. > indeed you are right! Many thanks for the hint. > Unfortunately, I'm not active with Qucs anymore. > Can someone else fix it? > >> Transcalc is optimistic by a factor of approximately 2 for conductor >> loss for the coaxial line calculation compared to bench and calculation >> by other methods. This issue may go back to a misinterpretation of >> formulas in some early publications where "D" was actually 2*D and "d" >> was actually 2*d. >> >> I propose that the D and d parameters (outer and inner conductor >> _diameters_) should actually be treated (renamed) as radii: >> >> For a line with a 10 mm ID outer conductor and a 3 mm OD inner >> conductor, giving "D" as 5 mm and "d" as 1.5 mm gives loss and resonator >> Q values that agree with what I'm seeing on the bench. >> >> For example, see/try the program Wcalc ( http://wcalc.sourceforge.net/ ) >> - Transcalc yields loss values that agree with Wcalc when I use radius >> values with Transcalc. >> >> Best Regards, >> >> Howard Hutchins ```
 Re: [Qucs-help] Transcalc error From: Stefan Jahn - 2011-03-02 18:23:16 ```Am So, 24.01.2010, 19:10 schrieb Michael.Margraf@...: > Hello, Hello! > indeed you are right! Many thanks for the hint. > Unfortunately, I'm not active with Qucs anymore. > Can someone else fix it? I fixed it everywhere: documentation, simulator and transcalc. Thanks, Stefan. ```