开云体育

--

*Dave - W?LEV*
*Just Let Darwin Work*
*Just Think*

On Thu, Jan 2, 2020 at 09:08 PM, David Eckhardt wrote:

Thanks, Dave!
If you remove the filename from that link, e.g., , there's an index of over 300 RF engineering course files there! I collected them all... :-)
--KV5R

Thanks for the tip, Harold. I shall have a look. Based on the quality of
the Smith Chart treatment, they must be excellent. Just hope others take
advantage. Have a read of my QRZ page to find out what I'm all about. I
get a lot of satisfaction working technical and teaching with the HS
students at Berthoud, Co., HS

Dave - W?LEV

--

*Dave - W?LEV*
*Just Let Darwin Work*
*Just Think*

Thanks, Dave!
If you remove the filename from that link, e.g., , there's an index of over 300 RF engineering course files there! I collected them all... :-)
--KV5R
=====================================

Any chance you might put them all into a single Zip file for others to access?

Thanks!

73,
David GM8ARV
--
SatSignal Software - Quality software for you
Web:
Email: david-taylor@...
Twitter: @gm8arv

Folks, if you want these please remember that you may be accessing a system that is supposed to be restricted to University of Kansas students who pay for the courses associated with these files.?
Anyone in the US copying and then sharing the files could be in for a ton of trouble so please be careful.




On Sun, 5 Jan 2020 at 3:24 AM, David J Taylor via Groups.Io<david-taylor@...> wrote: Thanks, Dave!
If you remove the filename from that link, e.g.,
, there's an index of over 300
RF engineering course files there! I collected them all... :-)
--KV5R
=====================================

Any chance you might put them all into a single Zip file for others to
access?

Thanks!

73,
David GM8ARV
--
SatSignal Software - Quality software for you
Web:
Email: david-taylor@...
Twitter: @gm8arv

KV5R,

They are the handout for the courses on antenna and feedlines.
As such they are often read this, evaluate this question.

If your going to suck those files up, then get the books that go with them as many
do reference them for reading. If not you are just wasting disk space.

Allison
-----------------
No direct email, it goes to bit bucket due address harvesting in groups.IO

On Sun, Jan 5, 2020 at 02:24 AM, David J Taylor wrote:

Any chance you might put them all into a single Zip file for others to access?

Umm, I love to, but no... U.Kansas makes them publicly available (not restricted to student accounts), but re-packaging and posting them, without written permission, would not be appropriate or legal.
73, --KV5R

From: KV5R

On Sun, Jan 5, 2020 at 02:24 AM, David J Taylor wrote:

Any chance you might put them all into a single Zip file for others to access?

Umm, I love to, but no... U.Kansas makes them publicly available (not restricted to student accounts), but re-packaging and posting them, without written permission, would not be appropriate or legal.
73, --KV5R
================================

Understood, thanks!

David GM8ARV
--
SatSignal Software - Quality software for you
Web:
Email: david-taylor@...
Twitter: @gm8arv

Hey Allison,

Thanks for the hints. Any idea on the referenced books?

Thanks,
Adrian

Add the Firefox Downloadthemall add-on to your FF browser. Takes < 1 minute to get all the files.

I believe this is the referenced book (attached photo and syllabus for the class below) - pulled from the parent directory of the handout directory.

Randy
NC8U

Hi all,

A bit late in responding, but to all those who are just starting out, and having a learning curve approaching the Smith Chart, I have put together an introductory article.? You can find it here:

73's

Aldo
W2AGC
--
------------------------------------------------------------------------
*Aldo Cugnini*
/908-867-8550/

GREAT Article, Aldo - Thanks!

Aldo you are an extremely gifted educator and writer. Exceptional article! Best intro I’ve ever read on the smith chart. I wish you would write more. In fact, write a book. I would buy it!

Randy
NC8U

As a very seldom poster here I cannot help to make the following comments,
"gained" from experience with few allegedly technical forums.
Some of them amateur radio related, some not.

I will freely admit that I am not the best communicator when explaining my requests.

However, I am always trying to be a simpleton, generally on kindergarten level .
Thus I believe I posted very basic and simple question, I even asked for no sermons...

What " we have now.. is failure to communicate " , and this thread has been simply
hijacked to advertise / discuss virtues of Smith chart etc etc.
Nothing wrong with posting educational stuff about Smith chart,
but could you do it in ANOTHER , more appropriate thread ?

As a result, I will no longer monitor or contribute to this thread.
10-4

I guess his DELETE button didn't work...
On Sat, Mar 28, 2020 at 2:37 PM, vaclav_sal via Groups.Io<vaclav_sal@...> wrote: As a very seldom poster here I cannot help to make the following comments,
"gained" from experience with few allegedly? technical forums.
Some of them amateur radio related, some not.

I will freely admit that I am not the best communicator when explaining my requests.

However, I am always trying to be a simpleton, generally on kindergarten level .
Thus I believe I posted very basic and simple question, I even asked for no sermons...

What " we have now.. is failure to communicate " , and this thread has been simply
hijacked to advertise / discuss virtues of Smith chart etc etc.
Nothing wrong with posting educational stuff about Smith chart,
but could you do it in ANOTHER , more appropriate thread ?

As a result, I will no longer monitor or contribute to this thread.
10-4

Aldo, in your tutorial is said:

Reading off the chart, we see the following values:...

Would you please explain where these values are seen?

Thanks!!
--
I_B_Nbridgema

There several tutorials in the files section, I've spent may years in
electronics and I still need a refresher from time to time. Read the
tutorials and it will clarify
Tom Sides KI7FTK
skype: Thomas Sides
4243 e. st Charles ave
Phx AZ 85042



On Sun, Mar 29, 2020 at 11:38 AM Nbridgema via Groups.Io <nbridgema=
[email protected]> wrote:

Aldo, in your tutorial is said:

Reading off the chart, we see the following values:...

Would you please explain where these values are seen?

Thanks!!
--
I_B_Nbridgema

Thanks for trying to help, Tom in AZ, but what good will it do to study hundreds of hours to try to make sense of that one line?
That is, I do not see on the chart any markings that allow scaling frequency relative to the (nearly invisible) green mark.

I used Smith charts to guide fabrication of waveguide filters, more years ago than I care to remember! : > )

--
I_B_Nbridgema

Nbridgema wrote:

Reading off the chart, we see the following values:...
Would you please explain where these values are seen?

The answer is, you cannot directly read frequency off of the Smith chart.
There should be little notes and arrows added as annotation to the chart,
telling where the 14.0mhz, 14.175mhz, and 14.35mhz points of the blue arc are at.

The blue arc goes clockwise from 14.0mhz in the upper left to 14.35mhz in the lower right.
If you zoom in and put on your best reading glasses, you may see a little green pixel in the blue arc
just below the horizontal line identified as "0.2", this point on the blue arc is 14.175mhz.

The first entry of the table after the chart says that the reflection coefficient at 14mhz
is (-0.12, j0.26). That's a complex number, having a real part of -0.12 and an imaginary part of j0.26.
This corresponds to the upper left end of the blue arc.
The real part of -0.12 is slightly to the left of the center vertical axis of the chart, a bit more than halfway to that first -0.2 vertical line.
The imaginary part of j0.26 is up from the center horizontal axis of the chart, a bit above the first horizontal marker at 0.2.


There's all of four sentences in this tutorial describing the central concept of what a Smith Chart is:

Radio operators are inherently familiar with the concept of standing-wave ratio, i.e., a measure of how well a load
is matched to a transmission line. A slightly more obscure concept is that of the reflection coefficient.
Notated using the Greek letter gamma (Γ), the reflection coefficient describes how much of an
electromagnetic wave is reflected by an impedance discontinuity such as a mismatched load. ...
First, let’s plot the real and imaginary components of Γ for this DUT on a rectilinear graph.

So I'd say Aldo's tutorial is not very useful to someone starting out, you pretty much have to already know
what a Smith Chart is. The title should give a hint of this: "Revisiting the Smith Chart".
But if you do understand the basics, there is plenty of good information there.

Here's an old post about a different Smith Chart tutorial: /g/nanovna-users/message/5223
This tutorial does try to explain in simple terms what a Smith Chart is.
That entire thread might still be of interest to those thinking about how to better document these VNA's.

Another good resource for understanding the Smith Chart is at

Jerry, KE7ER