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Re: backyard antenna ranges

 

"I've also found the same general idea very useful in measuring the relative coupling between my various ham antennas so that I can decide if I need to worry about protecting receivers on a given antenna from transmitters on others...."

That's a very usable idea! Thanks


SAA2N problem

 

I have an SAA2N that has been working fine. Yesterday I was using it to measure a long run of coax, and it was working fine. Then it just started acting like it was not sending a signal out of port 0. I reset the calibration, and noticed on the smith chart with nothing attached to port 0, the dot was near the left side of the smith chart that would normally indicate a short. I put the 50 ohm load on it, and the dot did not move, nor when I put on the short.
I decided to calibrate it, so ran through the calibration procedure, and now I get the spaghetti screen (lines all over the place). If I reset the calibration, it goes back to the trace on the left side of the smith chart.
It is acting like there is a short on port 0. Has anybody had this happen? I tried resetting everything, and results are exactly the same...
Thoughts?
Thanks!
Tom


Re: backyard antenna ranges

 

Last winter I did a lot of UHF antenna debugging for a wireless microphone installation project in my small basement by using the through mode of the VNA and measuring the loss/gain between the antenna under test and a dipole antenna a few wavelengths away.

I built a number of discone variants and log periodic arrays for the 500Mhz range and found it easy to weed out the ones that were a waste of time. I ended up with some nice tiny discones and A4 size log periodics for the final installation...

Of course I did not get absolute measurement quality results and I had to experiment a bit to confirm that I wasn't seeing reflected paths from nearby objects, but the results were useful enough to build several prototypes and pretest the final versions before taking ithem outside.

I've also found the same general idea very useful in measuring the relative coupling between my various ham antennas so that I can decide if I need to worry about protecting receivers on a given antenna from transmitters on others....

M


Re: spreading information far and wide, usefully

Jean-Denis Muys
 

IMHO, the best choice for editable documents is Markdown. Sure it has limitations, eg it¡¯s cumbersome to include images.

Also PDF is more editable than it looks. This requires specialized software though. I use PDF Expert on my Mac.

Jean-Denis

On Feb 3, 2021, at 08:24, Dragan Milivojevic <d.milivojevic@...> wrote:

Docx is not an open standard. OpenDocument is and it is an
international standard.

On Wed, 3 Feb 2021 at 17:03, Jim Lux <jim@...> wrote:

On 2/3/21 7:40 AM, Manfred Mornhinweg wrote:
I was also opening these docx files in OpenOffice, on my good old
Windows XP. But like Jean-Denis comments, the format gets screwed up, the
colums don't align.

Using PDF is much better. Probably pretty much any computer and similar
device in the world has a PDF reader installed, that works well. And most
text processors can write PDF files directly, and for those that cannot,
it's easy enough to print to a PDF conversion utility. So their is no good
reason to distribute text files in the internal formats of specific text
processor programs.

we're sort of getting off nanovna here, so if the moderators want to
kill it, fine.

The problem with pdf is that it's not editable. .docx and LaTeX are both
editable forms, with varying degrees of portability and cross platform
ness.

If you want to create something where others contribute changes (like a
user manual) then pdf isn't great. As others have noted, .docx is "sort
of" supported across a wide variety of readers (LibreOffice, Mac
TextEdit) - The problem I've found is that the stuff you really want to
control (page layout, tables, and image management) is the part that
breaks first. Such is life.

There are long wars about preferences for LaTeX vs MSWord, and a lot
depends on the community you come from. Academia in the physical
sciences or math - probably LaTeX; Academia in other fields - probably
Word; Industry in general - Word; US Government - Word. Cloud apps like
overleaf make working with LaTeX easier, but does require an internet
connection. There are WYSIWYG LaTeX editors out there too.

I've not had great success with various Wiki or Markdown approaches for
tutorial or reference material. Something about it causes it to
gradually degrade in formatting or to become disorganized. Pretty
rapidly, most wikis become a place where the information you need is
"somewhere" but it's hard to figure out where. Same applies to large
document repositories - I guess this is why editors and curators are
necessary, because the search engines tend to find too little or too much.


Probably what is best in the long run is how some papers are being
published - pdf or html for the text, with separate discrete files for
the images and/or tables. You can read it easily with the pdf, but if
you want to pull the full resolution figure, or import the tabular data,
it's available. My own preference is that if you used software to
generate the data plots, can you provide the data and the software code
used for the plot (usually Matlab or Python). That makes it possible to
regenerate the plot, or add data to it, or add markings, which is often
handy.













Re: USING THE NANOVNA AND SAVER TO MEASURE CM ATTENUATION THROUGH CMCs

 

Yes, Flex-Weave, AWG #14, from DavisRF is what I used.

Dave - W?LEV

On Wed, Feb 3, 2021 at 10:49 AM John Button G8JMB via groups.io
<hornpipe112@...> wrote:

Hi Dave

Thank you for your really helpful reply. Puts a lot into perspective.

My comment on wire was not directed to metric/imperial - that's a minor
inconvenience, just means using wire tables- but to proprietry wire types,
eg "'antenna' wire from DavisRF ".
I looked at the Davis RF site - there are several possibilities- did you
use flexweave, pe or pvc insulation?


73
John G8JMB





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


Re: USING THE NANOVNA AND SAVER TO MEASURE CM ATTENUATION THROUGH CMCs

 

On Wednesday 03 February 2021 11:16:01 am Zack Widup wrote:
Both Open Office and Libre Office (free programs) can open docx files.

Zack
Right. But both of these are rather resource-intensive, take a while to load, and make me not want to bother with the document in question.

On Wed, Feb 3, 2021 at 9:52 AM Roy J. Tellason, Sr. <roy@...>
wrote:

On Tuesday 02 February 2021 01:14:53 pm Joe St. Clair AF5MH wrote:
I suggest that you convert the document to PDF format. The .docx format
seems to be problematic on non-Microsoft systems.

Agreed. I _can_ open those docx files, but won't for the most part
bother...

--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin


Re: spreading information far and wide, usefully

 

Docx is not an open standard. OpenDocument is and it is an
international standard.

On Wed, 3 Feb 2021 at 17:03, Jim Lux <jim@...> wrote:

On 2/3/21 7:40 AM, Manfred Mornhinweg wrote:
I was also opening these docx files in OpenOffice, on my good old
Windows XP. But like Jean-Denis comments, the format gets screwed up, the
colums don't align.

Using PDF is much better. Probably pretty much any computer and similar
device in the world has a PDF reader installed, that works well. And most
text processors can write PDF files directly, and for those that cannot,
it's easy enough to print to a PDF conversion utility. So their is no good
reason to distribute text files in the internal formats of specific text
processor programs.

we're sort of getting off nanovna here, so if the moderators want to
kill it, fine.

The problem with pdf is that it's not editable. .docx and LaTeX are both
editable forms, with varying degrees of portability and cross platform
ness.

If you want to create something where others contribute changes (like a
user manual) then pdf isn't great. As others have noted, .docx is "sort
of" supported across a wide variety of readers (LibreOffice, Mac
TextEdit) - The problem I've found is that the stuff you really want to
control (page layout, tables, and image management) is the part that
breaks first. Such is life.

There are long wars about preferences for LaTeX vs MSWord, and a lot
depends on the community you come from. Academia in the physical
sciences or math - probably LaTeX; Academia in other fields - probably
Word; Industry in general - Word; US Government - Word. Cloud apps like
overleaf make working with LaTeX easier, but does require an internet
connection. There are WYSIWYG LaTeX editors out there too.

I've not had great success with various Wiki or Markdown approaches for
tutorial or reference material. Something about it causes it to
gradually degrade in formatting or to become disorganized. Pretty
rapidly, most wikis become a place where the information you need is
"somewhere" but it's hard to figure out where. Same applies to large
document repositories - I guess this is why editors and curators are
necessary, because the search engines tend to find too little or too much.


Probably what is best in the long run is how some papers are being
published - pdf or html for the text, with separate discrete files for
the images and/or tables. You can read it easily with the pdf, but if
you want to pull the full resolution figure, or import the tabular data,
it's available. My own preference is that if you used software to
generate the data plots, can you provide the data and the software code
used for the plot (usually Matlab or Python). That makes it possible to
regenerate the plot, or add data to it, or add markings, which is often
handy.










Re: USING THE NANOVNA AND SAVER TO MEASURE CM ATTENUATION THROUGH CMCs

 

Both Open Office and Libre Office (free programs) can open docx files.

Zack

On Wed, Feb 3, 2021 at 9:52 AM Roy J. Tellason, Sr. <roy@...>
wrote:

On Tuesday 02 February 2021 01:14:53 pm Joe St. Clair AF5MH wrote:
I suggest that you convert the document to PDF format. The .docx format
seems to be problematic on non-Microsoft systems.

Agreed. I _can_ open those docx files, but won't for the most part
bother...


--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies.
--James
M Dakin





<>
Virus-free.
www.avg.com
<>
<#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>


spreading information far and wide, usefully

 

On 2/3/21 7:40 AM, Manfred Mornhinweg wrote:
I was also opening these docx files in OpenOffice, on my good old Windows XP. But like Jean-Denis comments, the format gets screwed up, the colums don't align.

Using PDF is much better. Probably pretty much any computer and similar device in the world has a PDF reader installed, that works well. And most text processors can write PDF files directly, and for those that cannot, it's easy enough to print to a PDF conversion utility. So their is no good reason to distribute text files in the internal formats of specific text processor programs.
we're sort of getting off nanovna here, so if the moderators want to kill it, fine.

The problem with pdf is that it's not editable. .docx and LaTeX are both editable forms, with varying degrees of portability and cross platform ness.

If you want to create something where others contribute changes (like a user manual) then pdf isn't great.? As others have noted, .docx is "sort of" supported across a wide variety of readers (LibreOffice, Mac TextEdit)? - The problem I've found is that the stuff you really want to control (page layout, tables, and image management) is the part that breaks first. Such is life.

There are long wars about preferences for LaTeX vs MSWord, and a lot depends on the community you come from. Academia in the physical sciences or math - probably LaTeX; Academia in other fields - probably Word; Industry in general - Word; US Government - Word. Cloud apps like overleaf make working with LaTeX easier, but does require an internet connection. There are WYSIWYG LaTeX editors out there too.

I've not had great success with various Wiki or Markdown approaches for tutorial or reference material. Something about it causes it to gradually degrade in formatting or to become disorganized.?? Pretty rapidly, most wikis become a place where the information you need is "somewhere" but it's hard to figure out where. Same applies to large document repositories - I guess this is why editors and curators are necessary, because the search engines tend to find too little or too much.


Probably what is best in the long run is how some papers are being published - pdf or html for the text, with separate discrete files for the images and/or tables. You can read it easily with the pdf, but if you want to pull the full resolution figure, or import the tabular data, it's available. My own preference is that if you used software to generate the data plots, can you provide the data and the software code used for the plot (usually Matlab or Python).? That makes it possible to regenerate the plot, or add data to it, or add markings, which is often handy.


Re: USING THE NANOVNA AND SAVER TO MEASURE CM ATTENUATION THROUGH CMCs

 

On Tuesday 02 February 2021 01:17:23 pm David Eckhardt wrote:
oooops. When I send them to the files section, I shall do so. Thanks
for the suggestion. I thought Apple could read .docx files. Are we back
to Apple vs. IBM? Humbug......
I've run nothing but linux here since 1999...

--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin


Re: USING THE NANOVNA AND SAVER TO MEASURE CM ATTENUATION THROUGH CMCs

 

On Tuesday 02 February 2021 01:14:53 pm Joe St. Clair AF5MH wrote:
I suggest that you convert the document to PDF format. The .docx format seems to be problematic on non-Microsoft systems.
Agreed. I _can_ open those docx files, but won't for the most part bother...


--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin


Re: USING THE NANOVNA AND SAVER TO MEASURE CM ATTENUATION THROUGH CMCs

 

Folks, use the online document translate/conversion site that I use:
/g/nanovna-users/message/16761


Works great.

On Wednesday, February 3, 2021, 10:41:04 a.m. EST, Manfred Mornhinweg <manfred@...> wrote:

I was also opening these docx files in OpenOffice, on my good old Windows XP. But like Jean-Denis comments, the format gets screwed up, the colums don't align.

Using PDF is much better. Probably pretty much any computer and similar device in the world has a PDF reader installed, that works well. And most text processors can write PDF files directly, and for those that cannot, it's easy enough to print to a PDF conversion utility. So their is no good reason to distribute text files in the internal formats of specific text processor programs.


Re: USING THE NANOVNA AND SAVER TO MEASURE CM ATTENUATION THROUGH CMCs

 

I was also opening these docx files in OpenOffice, on my good old Windows XP. But like Jean-Denis comments, the format gets screwed up, the colums don't align.

Using PDF is much better. Probably pretty much any computer and similar device in the world has a PDF reader installed, that works well. And most text processors can write PDF files directly, and for those that cannot, it's easy enough to print to a PDF conversion utility. So their is no good reason to distribute text files in the internal formats of specific text processor programs.


Re: Differences of H4 and SAA2N #buying #features

 

From what I understand SAA2N has better dynamic range than the 1.5GHz nanoVNA and thus is better for duplexer and cavity filter tuning.


Re: NanoVNA RF Demo Kit connection

 

Regarding the two 3D-printed tools I posted, use 0.15 mm (or 0.2 mm) layer height,
and 100 % infill when slicing for 3D-print.


Re: NanoVNA RF Demo Kit connection

 

I had the same problem with the U.FL connectors .
I modelled a small tool to solve the problem, thinking it should be used to connect, and then removed.
When I had made a test printout, I realized that it could be left on the U.FL connector. It will stick to the
connector and cable.

I have also made a small 8 mm wrench for SMA-connectors, I guess it will break before the connector is
tightened too much.


Re: SAA-2N CAUTION #design #hardware

 

I have posted on this before a month or so ago.

You will need a very thin nut, otherwise the control buttons will disappear. Also those nuts are vey difficult to find and I would probably cut up the sleeve of an old N connector if I were going to do it. I have a lathe which would make the job easier.

If you take the 2N innards out of the metal case, you will see that the top plate actually rests on some lugs inside the case. If the assembly is put together right, the nuts on the N connectors actually tighten the top plate against these lugs, not against the edge of the circuit board, which is in effect, floating.

I have not actually seen a single post about the connectors actually coming loose off the 2N board. I think it may be because people incorrectly occasionally use a ¡°wrench¡± on sma connectors, but only use bare fingers on N connectors as there is only knurling for a gentle finger grip, rather than flats on which a spanner might rest. (I suppose Mr Low-iq Armstrong might try a mole wrench, but is probably too thick to know what a network is).

I always push the N or sma connector home first, before tightening the ring, rather than use the ring to draw the connectors together.

Steve L


Re: USING THE NANOVNA AND SAVER TO MEASURE CM ATTENUATION THROUGH CMCs

 

Hi Jean-Denis
I'm not in thrall to paid for uSoft stuff. docx opens fine with 'open office' on my win7 pc, but I agree, docx is not the best for universal use.
On the group I run we try to upload files as .txt or .doc [office 97] - and for the last, a pdf as well.
73
John


Re: USING THE NANOVNA AND SAVER TO MEASURE CM ATTENUATION THROUGH CMCs

 

Hi Dave

Thank you for your really helpful reply. Puts a lot into perspective.

My comment on wire was not directed to metric/imperial - that's a minor inconvenience, just means using wire tables- but to proprietry wire types, eg "'antenna' wire from DavisRF ".
I looked at the Davis RF site - there are several possibilities- did you use flexweave, pe or pvc insulation?


73
John G8JMB


Re: [Amateur-repairs] USING THE NANOVNA AND SAVER TO MEASURE CM ATTENUATION THROUGH CMCs

 

Hi Dave,

good work, but some pics can't be displayed over here. Do you think you can provide this document as PDF please?

Thank you.

Carsten, DL8AAP


David Eckhardt < davearea51a@... > hat am 01.02.2021 23:00
geschrieben:




I promised this, so here it is. See the attachment for a procedure to
measure the CM attenuation through CMCs and other 4-terminal devices (as
in
s-parameters). Comments and improvements are welcome before I post it to
the files section.


Dave - W?LEV