SmartSmith for Windows is a Smith Chart program designed to provide a
convenient tool for designing transmission line matching sections. It
can also design matching sections for any electrical circuit in which
it is important to be able to visualize the progress being made while
configuring a particular matching section circuit element.

The program provides for data entry in the form of a complex
impedance in "a + jb" (Cartesian) form that is to be matched to a
purely resistive characteristic impedance as would typically be
encountered in transmission lines. The primary limitation of such an
approach for anything other than transmission lines is that the
characteristic impedance of the line to which we desire a match is
assumed to be purely resistive (no imaginary component).

SmartSmith for Windows provides the user with a suite of nine
different impedance transforming elements that can be used in the
program to implement an impedance match. These nine individually
configurable elements a
• Series Resistance (ohms)
• Shunt Conductance (milli-mhos)
• Series Capacitance (ohms of reactance and pF)
• Shunt Capacitive Susceptance (milli-Siemens )
• Series Inductance (ohms of reactance and uH)
• Shunt Inductive Susceptance (milli-Siemens)
• Open Stub (0 – 90 degrees, any Zo)
• Shorted Stub (90 – 0 degrees, any Zo)
• Series Trans. Line (-180 to 0 to +180 degrees, any Zo)

SmartSmith has many advantages over the paper Smith Chart. Plotting
impedance points on a Smith Chart can be very tedious. Each time a new
value of a design element is to be evaluated, the designer must
generate a new value of reactance in ohms for that element and must
then calculate a new value for the net impedance seen looking into the
circuit with this new value of matching section in place. The designer
then takes those new values of the real and imaginary parts,
normalizes those values and locates the correct coordinates on the
Smith Chart and draws a new point on the chart.

With SmartSmith that process is reduced to clicking the mouse on the
spin control to change the value of that design element and see the
new point being plotted instantaneously. SmartSmith also continuously
shows the complex values of normalized admittance and impedance as the
points are plotted.

In order to progress through the design steps, as a design element is
completed, the designer presses the “Keep and Continue” button in
order to take the latest value of impedance and save that as the new
Load impedance, leaving the plotted points on the Smith Chart. He then
picks the next matching section type and begins configuring that
element to continue the design, as necessary. At any point, the
designer can use the “Discard and Start Over” button to reset the
system to the last “Keep and Continue” values and select a different
type matching section.

The most important feature of SmartSmith is its Wizard. Having entered
the Load impedance into the program, the inexperienced designer may
not have any idea where to begin. By pressing the “What Would the
Wizard Advise” button, the user is taken through a set of simple steps
to transform that impedance to 1 + j0, normalized, and those steps
have been automatically chosen based on the region of the Smith Chart
in which the Load impedance is located.

Download your free copy of SmartSmith version 1.1 using the following
link (slightly larger than 2 MB):

http://www.qsl.net/w9dmk/SWDownloads/SmartSmith11.zip

Or, visit my Web site and peruse all of the free software at:

http://www.qsl.net/w9dmk


Bob, W9DMK, Dahlgren, VA
http://www.qsl.net/w9dmk

On Fri, 29 Oct 2004 02:31:10 GMT, (Robert Lay
W9DMK) wrote:

Download your free copy of SmartSmith version 1.1 using the following
link (slightly larger than 2 MB):

http://www.qsl.net/w9dmk/SWDownloads/SmartSmith11.zip

Or, visit my Web site and peruse all of the free software at:

http://www.qsl.net/w9dmk

Hi Bob,

Thanx, I look forward to trying this out.

73's
Richard Clark, KB7QHC

Can't download the file Bob, wonder if anyone else has had a problem. Tried 5
times.
73 Gary N4AST

On 29 Oct 2004 23:20:25 GMT, (JGBOYLES) wrote:

Can't download the file Bob, wonder if anyone else has had a problem. Tried 5
times.
73 Gary N4AST

Dear Gary,

I have only had one person send me a message about the program and he
said nothing about any problem in downloading. Could you tell me
whether you are clicking on the link while at my Web page or are you
using the link that I put in my posting to rraa?

If you are not successful, send me a message at ,
and I will send it to you as an attachment.


Bob, W9DMK, Dahlgren, VA
http://www.qsl.net/w9dmk

In article , Robert Lay W9DMK wrote:
On 29 Oct 2004 23:20:25 GMT, (JGBOYLES) wrote:

Can't download the file Bob, wonder if anyone else has had a problem. Tried 5
times.
73 Gary N4AST

Dear Gary,

I have only had one person send me a message about the program and he
said nothing about any problem in downloading. Could you tell me
whether you are clicking on the link while at my Web page or are you
using the link that I put in my posting to rraa?

If you are not successful, send me a message at ,
and I will send it to you as an attachment.


Bob, W9DMK, Dahlgren, VA
http://www.qsl.net/w9dmk

qsl.net is notoriously slow. Anybody with a fat pipe (I got T1 at work) can
see this. I tried today and got nowhere, both with the link in the post and
on the website. Too bad, these look like great programs. I would be
willing to PAY for them on a cd.

On Sat, 30 Oct 2004 01:15:58 -0000, Barnacle Bill
wrote:

qsl.net is notoriously slow. Anybody with a fat pipe (I got T1 at work) can
see this. I tried today and got nowhere, both with the link in the post and
on the website. Too bad, these look like great programs. I would be
willing to PAY for them on a cd.

Dear Bill,

Slow is relative. For someone like me with a V.90 modem, everything
seems slow. I get the same download speeds from QSL as from anywhere
else - about 4 kBytes/sec.

Getting the software on is easier than you might think. I will try to
honor such requests for what is essentially my costs, so long as the
volume of requests isn't too high.

Anyone who sends me a Self Addressed 6" x 9" clasp type manila
envelope with a dollar bill in it gets a CD by return mail.

R. Lay
15517 Delaware Dr.
King George, VA 22485
Bob, W9DMK, Dahlgren, VA
http://www.qsl.net/w9dmk

I successfully (I think) downloaded the file about a day ago, but the
speed was extremely slow. It was about the speed of a dialup connection,
although I have a T1 speed line.

Roy Lewallen, W7EL

Barnacle Bill wrote:

qsl.net is notoriously slow. Anybody with a fat pipe (I got T1 at work) can
see this. I tried today and got nowhere, both with the link in the post and
on the website. Too bad, these look like great programs. I would be
willing to PAY for them on a cd.

Hi Bob -

Thank you very much for making these available!

I just downloaded SmartSmith from your qsl.net links,
and I'm looking forward to trying it.

BTW, qsl.net WAS spectacularly slow, averaging
0.5 kB/s. It's a good thing this was "only" 2MB.

73, Ed, W6LOL

On Sat, 30 Oct 2004 23:52:24 -0000, Barnacle Bill
wrote:


Some of us have gotten spoiled rotten by our wideband connections. I for
one have a T1 at work and do most of my downloading there. Maybe it's time
to step back, take a deep breath, and recall when we had a 1200 baud modem!

Dear BB,

Amen!

My first experience with "dial-up" was in 1965. I was asked to try out
a program in Basic that designed electric motors. You had to dial up
this big main frame in Boston - Dartmouth, I think. We had a teletype
as a terminal and an acoustic modem at 300 baud. The acoustic modem
was a telephone handset with sponge cups for earpiece and mouthpiece
that snugged around the telephone handset. Acoustic coupling means no
electric connection - good for lightning isolation - Hi!

You typed in your Basic program and tried it out. If you wanted to pay
a monthly fee for storage you could save your typed in program on
their disk for a monthly fee. Talk about a text based interface -
primitive doesn't even begin to describe it.

I am tickled to have V.90 at somewhere above 33 kBaud. It makes your
head swim to think about where it will be 5 years from now.
Bob, W9DMK, Dahlgren, VA
http://www.qsl.net/w9dmk

Barnacle Bill wrote:
Maybe it's time
to step back, take a deep breath, and recall when we had a 1200 baud modem!

I remember saving up for a 300 baud modem.
--
73, Cecil http://www.qsl.net/w5dxp


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