Re: S - Y Parameter conversion with Smith Chart

From: Paul Burridge (pb_at_notthisbit.osiris1.co.uk)
Date: 07/31/04 

Date: Sat, 31 Jul 2004 23:43:00 +0100

On Sat, 31 Jul 2004 22:22:17 +0100, John Woodgate
<jmw@jmwa.demon.contraspam.yuk> wrote:

>I read in sci.electronics.design that Reg Edwards
><g4fgq.regp@ZZZbtinternet.com> wrote (in <cegvp8$gpk$1@hercules.btintern
>et.com>) about 'S - Y Parameter conversion with Smith Chart', on Sat, 31
>Jul 2004:
>
>>It applied ONLY to the HF spectrum, serious calculating errors occurr if
>>applied to the LF spectrum and below although few engineers realised
>>this. And still don't.
>
>Could you please explain that a bit more? The chart is a graphical way
>of doing mathematics. Where does frequency enter the picture?

Perhaps Reg can also tell us in which year since the Chart's inception
the mathematical relationship between a graphical solution to a
computation and a numerical one broke down? 

-- 
"What is now proved was once only imagin'd." - William Blake, 1793.