Re: [Qucs-help] Transcalc error

[<Mic...@al...>]

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
>
>
>
>
>
>
>
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