RadioBanter - Smith chart

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March 6th 07 01:24 PM

Smith chart

Does anyone have any smith chart tutorials that are easy to follow as
i have some technicians who require some study aids, most of the
tutorials around are a bit over burdened with math.

cheers

John Ferrell

March 6th 07 02:44 PM

Smith chart

On 6 Mar 2007 05:24:27 -0800, wrote:

Does anyone have any smith chart tutorials that are easy to follow as
i have some technicians who require some study aids, most of the
tutorials around are a bit over burdened with math.

cheers

Here are my bookmarks on the subject:

http://education.tm.agilent.com/index.cgi?CONTENT_ID=5
http://www.scott-inc.com/html/smith.htm
http://www.maxim-ic.com/appnotes.cfm/appnote_number/742
http://www.rfcafe.com/business/softw..._for_excel.htm
http://en.wikipedia.org/wiki/Smith_chart

John Ferrell W8CCW

Frank's

March 6th 07 04:45 PM

Smith chart

wrote in message
oups.com...
Does anyone have any smith chart tutorials that are easy to follow as
i have some technicians who require some study aids, most of the
tutorials around are a bit over burdened with math.

cheers

RF Circuit Design by Chris Bowick has an excellent
description of the Smith Chart. Available at
www.amazon.com for $26.37.

Frank

Owen Duffy

March 6th 07 05:42 PM

Smith chart

wrote in news:1173187467.306167.194350
@j27g2000cwj.googlegroups.com:

Does anyone have any smith chart tutorials that are easy to follow as
i have some technicians who require some study aids, most of the
tutorials around are a bit over burdened with math.

I think you are asking for a tutorial on how to apply the Smitch chart
without needing to understand transmission line theory.

I am sure that one could teach a person the mechanics of solution of
specific problems, but that is all they will know rather than how to
apply the Smith chart to the solution of problems generally.

Today, when computer power allows precise solution of problems that were
pretty ugly on slide rules, the real benefit of the Smith chard IMHO, is
as a visualisation tool. If you take away the understanding that gives
its value as a visualisation tool, you have a crude graphical solution to
problems that can be more precisely and more conveniently solved with a
computer program (whether or not it displays results on a Smitch chart).

Did I say crude? Yes, graphical solutions on a Smith chart are prone to
gross error in some parts of the chart. That downside is to some extent
masked by the accuracy of the "known" quantities being plotted, but
software that solves the transmission line problems, including applying
line loss, are more accurate on high VSWR problems. People like McAlpine
worked at approximations of high VSWR scenarios to overcome the
shortcomings of that area of the Smitch chart, but that is not really
needed today, just solve the exact equations in a computer program.

That is not to say that there isn't a place for Smith charts, but IMHO
the greatest value is as a visualisation tool, and that requires an
understand of the underlying maths, but not the tedious solution of the
underlying maths.

Owen

Craig Buck

March 11th 07 04:07 AM

Smith chart

Wow - Thanks. Now I need about two weeks to try to digest it all. Good
stuff!
--
k4ia
Buck
Fredericksburg, VA

"John Ferrell" wrote in message
...
On 6 Mar 2007 05:24:27 -0800, wrote:

Does anyone have any smith chart tutorials that are easy to follow as
i have some technicians who require some study aids, most of the
tutorials around are a bit over burdened with math.

cheers

Here are my bookmarks on the subject:

http://education.tm.agilent.com/index.cgi?CONTENT_ID=5
http://www.scott-inc.com/html/smith.htm
http://www.maxim-ic.com/appnotes.cfm/appnote_number/742
http://www.rfcafe.com/business/softw..._for_excel.htm
http://en.wikipedia.org/wiki/Smith_chart

John Ferrell W8CCW

John Ferrell

March 12th 07 01:58 PM

Smith chart

On Sun, 11 Mar 2007 04:07:33 GMT, "Craig Buck"
wrote:

Wow - Thanks. Now I need about two weeks to try to digest it all. Good
stuff!
There are several sample questions available in the question pool for
the Amateur Extra Liscense pool. I am not a big fan of Smith Charts
but I need to keep up with the popular tools!

John Ferrell W8CCW
"Life is easier if you learn to
plow around the stumps"

Phil	March 24th 07 03:14 PM

Smith chart

Frank's wrote:
wrote in message
oups.com...
Does anyone have any smith chart tutorials that are easy to follow as
i have some technicians who require some study aids, most of the
tutorials around are a bit over burdened with math.

cheers

RF Circuit Design by Chris Bowick has an excellent
description of the Smith Chart. Available at
www.amazon.com for $26.37.

Frank

I second Frank's recommendation of Bowick. It also has very good
information on matching networks and transistor biasing.

Erich
KA6AMD

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