Re: New H4 User and PC Software Question
I still have my laminated Smith Chart that you can draw on with grease pencil or erasable marker. I also have a copy of Smith's book, bought from Smith himself.
With that, my Dietzgen slide rule, my grid dip meter, and my copies of "Radio Engineering" and "Radio Engineer's Handbook" by Terman I am ready for The Big One.
73, Don N2VGU
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Zahid,
There have been many messages regarding return loo in the forum.?
You should be able to use the search function and search for "return loss" and you will find a lot of info that has been covered.?
If you go to the forum Wiki (link at the end of each email) refer to the very first item regarding searching.?
Hi,
I'm new to nanovna, I want to use it to get the return loss.
How can I get it? I'm using c# and rs232 communication.
Thanks,
Zahi
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Hi,
I'm new to nanovna, I want to use it to get the return loss.
How can I get it? I'm using c# and rs232 communication.
Thanks,
Zahi
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Re: NanoSaver on ubuntu- mint
Yes, I install libreVNA with is on software and work, I cheek on Mint/Ubuntu? and give me the list of usb ports, I plug the NanoVNA and give me the Cypress USB driver is installed, *I give more detall* : when I plug the USB cable from the NanoVNA the Saver software not open, when I unplug the cable open up, the problem is NanoSaver software don't open the USB port. I tray to put this information on the terminal but not result. One other information I never use software terminal on my life. Thank you for the help the only think I doing is "copy and past on the terminal". Best regards. Francesco. *Sent:* Sunday, February 20, 2022 at 3:39 AM *From:* "Dragan Milivojevic" <d.milivojevic@...> *To:* [email protected]*Subject:* Re: [nanovna-users] NanoSaver on ubuntu- mint AFAIK Saver does not support LibreVNA
On Sat, 19 Feb 2022 at 10:24, Francesco <realfran@...> wrote: Hello, I install LibreVNA and work, I use the USB port for different
device and work, the only problem is NanoVNA-Saver is installed but not
find the the serial/usb device.
*Sent:* Saturday, February 19, 2022 at 4:36 AM
*From:* "Dragan Milivojevic" <d.milivojevic@...>
*To:* [email protected]
*Subject:* Re: [nanovna-users] NanoSaver on ubuntu- mint
On Sat, 19 Feb 2022 at 01:22, Francesco <realfran@...> wrote:
Hello, I set up one laptop with Mint Linux "cinnamon" I install NanoVNA
Saver I don't find the "device port" get a problem with the LiteVNA and the
NanoVNA V2 plus4.
Please some help, I'm computer illiterate and this is the first time I use
Linux (I'm lost) I install a lot of Python libraries and I get confused
with the " CONSOLE "
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Re: NanoSaver on ubuntu- mint
AFAIK Saver does not support LibreVNA
toggle quoted message
Show quoted text
On Sat, 19 Feb 2022 at 10:24, Francesco <realfran@...> wrote: Hello, I install LibreVNA and work, I use the USB port for different
device and work, the only problem is NanoVNA-Saver is installed but not
find the the serial/usb device.
*Sent:* Saturday, February 19, 2022 at 4:36 AM
*From:* "Dragan Milivojevic" <d.milivojevic@...>
*To:* [email protected]
*Subject:* Re: [nanovna-users] NanoSaver on ubuntu- mint
On Sat, 19 Feb 2022 at 01:22, Francesco <realfran@...> wrote:
Hello, I set up one laptop with Mint Linux "cinnamon" I install NanoVNA
Saver I don't find the "device port" get a problem with the LiteVNA and the
NanoVNA V2 plus4.
Please some help, I'm computer illiterate and this is the first time I use
Linux (I'm lost) I install a lot of Python libraries and I get confused
with the " CONSOLE "
|
Re: Unit Won't turn on after charging
Ok, try this...
Put the unit into dfu mode (hold in jog SW and turn on with usb cable connected) and see if the computer sees it's in dfu.?
On the H4, the LCD is dark during dfu mode.?If the PC recognizes it in dfu mode, push in new fw.?
On Sat., 19 Feb. 2022 at 3:41 p.m., Brady Nelson<tbradynelson@...> wrote: My board says v4.2.1. Unfortunately I don't have an oscilloscope right now to check the xtals.
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Re: New H4 User and PC Software Question
On Sat, Feb 19, 2022 at 04:52 PM, VK2CZ DAVID wrote:
Hello Bob,
The neat Smith Chart analysis & Simulation tool titled "SimSmith"
integrates to my NanoVNA... It runs on multiple OS. Suggest you take a
look at that, as it beats pencils and a calculator on a Smith Chart poster
print.
David VK2CZ
Life Senior Member IEEE
My whole intent was to import S parameter files into SimSmith - I've been using it for years. I have a small collection of both S1P files and CSV files I exported from my one port analyzer (AIM4170) and little things I've done with it. I just downloaded a more recent version of SimSmith, but in my rush to learn the NanoVNA didn't think of that road, just getting back to where I am now. Bob -- ___________ Bob - W4ATM -? 35 miles south of the Kennedy Space Center Retired RF Engineer now playing with all the hobbies I never had the time for.
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Have been using my nanoVNA-H to tune my antennas for the lower bands in ham radio for over a year. It has been a lifesaver! I started to use it recently and it seemed to complete the calibration procedure successfully. I saved the calibration and then connected the antenna to be tested. There was no sweep just one small dot at the lower lefthand point of the screen. Has my unit died or have I inadvertently changed some setting deep in a menu somewhere? I tried pausing and unpausing the sweep but that made no difference. Has anybody experienced anything like this with their unit? Thanks, Stephen KO4CVU
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Re: New H4 User and PC Software Question
Hello Bob,
The neat Smith Chart analysis & Simulation tool titled "SimSmith"
integrates to my NanoVNA... It runs on multiple OS. Suggest you take a
look at that, as it beats pencils and a calculator on a Smith Chart poster
print.
David VK2CZ
Life Senior Member IEEE
toggle quoted message
Show quoted text
On Sun, 20 Feb 2022, 03:47 montanaaardvark, <boblombardi@...> wrote: I've subscribed to this group for a long time but never posted. I only
bought my first NanoVNA last weekend. I bought an H4 for the larger
screen. Everything seems to be working fine. I had an issue updating the
firmware to DisLord's latest version from December, but that was Windows 10
being itself. I got that fixed and updated the firmware. I have a
one-port antenna analyzer that I can compare its measurements to and
everything seems close enough to be confident with it.
My question concerns PC software with it. I downloaded NanoVNA App after
reading the Wiki, but since it doesn't have any documentation, can't find
out ways to do things I'd like to do. I don't think it's possible with
this, so any pointers are appreciated. Including if any other piece of
software does these things better.
Simplest one first, I'd like to save the plots to S-parameter files. Is
that possible?
Is it possible to change the displays from Log Mag to magnitude and angle
or R and jX?
On NanoVNA app, I see how to push the VNA settings onto the app, but I
don't see how to push the app's settings onto the VNA. Is that possible?
Thanks,
Bob
___________
Bob - W4ATM - 35 miles south of the Kennedy Space Center
Retired RF Engineer now playing with all the hobbies I never had the time
for.
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Re: Unit Won't turn on after charging
My board says v4.2.1. Unfortunately I don't have an oscilloscope right now to check the xtals.
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Re: New H4 User and PC Software Question
Bob, move your mouse into the areas with the graphs and hit the right mouse button to bring up the control menu.?
Also search the forum messages for more info on Nanovna-App.?
On Sat., 19 Feb. 2022 at 11:47 a.m., montanaaardvark<boblombardi@...> wrote: I've subscribed to this group for a long time but never posted.? I only bought my first NanoVNA last weekend.? I bought an H4 for the larger screen.? Everything seems to be working fine.? I had an issue updating the firmware to DisLord's latest version from December, but that was Windows 10 being itself.? I got that fixed and updated the firmware.? I have a one-port antenna analyzer that I can compare its measurements to and everything seems close enough to be confident with it.?
My question concerns PC software with it.? I downloaded NanoVNA App after reading the Wiki, but since it doesn't have any documentation, can't find out ways to do things I'd like to do.? I don't think it's possible with this, so any pointers are appreciated.? Including if any other piece of software does these things better.
Simplest one first, I'd like to save the plots to S-parameter files.? Is that possible?
Is it possible to change the displays from Log Mag to magnitude and angle or R and jX?
On NanoVNA app, I see how to push the VNA settings onto the app, but I don't see how to push the app's settings onto the VNA.? Is that possible?
Thanks,
Bob
___________
Bob - W4ATM -? 35 miles south of the Kennedy Space Center
Retired RF Engineer now playing with all the hobbies I never had the time for.
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Re: Proper way to measure length of _Window_Line_?
Great post Bob, patient, thoughtful, and to the POINT. i.e. people do your homework before jumping into the 'fray'. There are lots of 'us' guys out there willing to help, but it is your responsibility to do your 'own' homework FIRST. That advice being, READ the original question and then go from there.
Mike C.
toggle quoted message
Show quoted text
On 2/19/2022 7:40 AM, Bob Ecclestone VK2ZRE wrote: As happens so often in these threads, we need to go back to the original post and read the question.
Kevin was puzzled as to why his S11 results did not show a distinct "short" when he tested his 300 Ohm ladderline connected directly to his NanoVNA unbalanced 50 Ohm S11 port.
He posted the sweep results in that original post..
Some folks offered possible reasons, others possible work arounds. But no one explained to him why he got the results he did. No one ANSWERED his original question.
I am not going to dispute any of the subsequent comments made regarding direct connections, common mode chokes or anything else posted here.
I offered one possible solution using a broadband impedance matching transformer because it is quite possible that Kevin is actually building an antenna being fed with 300 Ohm ladderline and that by building the transformer, he could verify his stub and then go on to test the completed antenna. As the system is now impedance matched back to 50 Ohms, his S11 results on the complete antenna system would now better reflect (pun intended) the actual system performance.
If folk are not comfortable winding their own transformers, there are bare transformers and packaged units readily available on the web.
If you are comfortable winding your own, it is almost as easy to wind a 300/50 matching transformer as it is a CM choke.
The difference is, you now have a piece of test kit specific to the task at hand.
The task in this case centres around 300 Ohm ladderline.
I do not know why Kevin got the results he did originally, but I am confident that if he uses a matching transformer, the results he gets next time should be closer to what he expects.
And as a final comment, the ladderline stub should be tested and trimmed well clear of any thing as even moisture on a non conducting pole will be enough to add distributed capacitance across the line and affect the apparent Velocity Factor. Metal, including other cables, in close proximity is a definite no no.
Which brings me to offer a possible REASON for Kevin's results.
He states he had 5.175m of "JSC 1320" cable. A quick check of the specs for 1320 ladderline gives a VF of 0.82
Therefore the ELECTRICAL wavelength of the line is 4(5.175/0.82) = 25.24m. This gives a frequency of 300/25.24 = 11.89MHz
Since Kevin only started his sweep at 12MHz, he did not sweep the actual stub frequency of 11.89MHz.
If the ladderline was lying on the ground or close to any metal, the "apparent" VF would be even lower and the electrical length and thus quarterwave frequency would be even lower again.
Looking at the Smith Chart, we can see it is approaching a zero Z but does not quite make it. Why? Because he should have started the sweep at a lower frequency.
That's my theory anyway.
So it pays to go back and read the entire original post.
73...Bob VK2ZRE
|
New H4 User and PC Software Question
I've subscribed to this group for a long time but never posted. I only bought my first NanoVNA last weekend. I bought an H4 for the larger screen. Everything seems to be working fine. I had an issue updating the firmware to DisLord's latest version from December, but that was Windows 10 being itself. I got that fixed and updated the firmware. I have a one-port antenna analyzer that I can compare its measurements to and everything seems close enough to be confident with it.
My question concerns PC software with it. I downloaded NanoVNA App after reading the Wiki, but since it doesn't have any documentation, can't find out ways to do things I'd like to do. I don't think it's possible with this, so any pointers are appreciated. Including if any other piece of software does these things better.
Simplest one first, I'd like to save the plots to S-parameter files. Is that possible?
Is it possible to change the displays from Log Mag to magnitude and angle or R and jX?
On NanoVNA app, I see how to push the VNA settings onto the app, but I don't see how to push the app's settings onto the VNA. Is that possible?
Thanks,
Bob
___________
Bob - W4ATM -? 35 miles south of the Kennedy Space Center
Retired RF Engineer now playing with all the hobbies I never had the time for.
|
Re: Proper way to measure length of _Window_Line_?
As happens so often in these threads, we need to go back to the original post and read the question.
Kevin was puzzled as to why his S11 results did not show a distinct "short" when he tested his 300 Ohm ladderline connected directly to his NanoVNA unbalanced 50 Ohm S11 port.
He posted the sweep results in that original post..
Some folks offered possible reasons, others possible work arounds. But no one explained to him why he got the results he did. No one ANSWERED his original question.
I am not going to dispute any of the subsequent comments made regarding direct connections, common mode chokes or anything else posted here.
I offered one possible solution using a broadband impedance matching transformer because it is quite possible that Kevin is actually building an antenna being fed with 300 Ohm ladderline and that by building the transformer, he could verify his stub and then go on to test the completed antenna. As the system is now impedance matched back to 50 Ohms, his S11 results on the complete antenna system would now better reflect (pun intended) the actual system performance.
If folk are not comfortable winding their own transformers, there are bare transformers and packaged units readily available on the web.
If you are comfortable winding your own, it is almost as easy to wind a 300/50 matching transformer as it is a CM choke.
The difference is, you now have a piece of test kit specific to the task at hand.
The task in this case centres around 300 Ohm ladderline.
I do not know why Kevin got the results he did originally, but I am confident that if he uses a matching transformer, the results he gets next time should be closer to what he expects.
And as a final comment, the ladderline stub should be tested and trimmed well clear of any thing as even moisture on a non conducting pole will be enough to add distributed capacitance across the line and affect the apparent Velocity Factor. Metal, including other cables, in close proximity is a definite no no.
Which brings me to offer a possible REASON for Kevin's results.
He states he had 5.175m of "JSC 1320" cable. A quick check of the specs for 1320 ladderline gives a VF of 0.82
Therefore the ELECTRICAL wavelength of the line is 4(5.175/0.82) = 25.24m. This gives a frequency of 300/25.24 = 11.89MHz
Since Kevin only started his sweep at 12MHz, he did not sweep the actual stub frequency of 11.89MHz.
If the ladderline was lying on the ground or close to any metal, the "apparent" VF would be even lower and the electrical length and thus quarterwave frequency would be even lower again.
Looking at the Smith Chart, we can see it is approaching a zero Z but does not quite make it. Why? Because he should have started the sweep at a lower frequency.
That's my theory anyway.
So it pays to go back and read the entire original post.
73...Bob VK2ZRE
|
Re: NanoSaver on ubuntu- mint
Hello, I install LibreVNA and work, I use the USB port for different device and work, the only problem is NanoVNA-Saver is installed but not find the the serial/usb device. *Sent:* Saturday, February 19, 2022 at 4:36 AM *From:* "Dragan Milivojevic" <d.milivojevic@...> *To:* [email protected]*Subject:* Re: [nanovna-users] NanoSaver on ubuntu- mint
On Sat, 19 Feb 2022 at 01:22, Francesco <realfran@...> wrote: Hello, I set up one laptop with Mint Linux "cinnamon" I install NanoVNA
Saver I don't find the "device port" get a problem with the LiteVNA and the
NanoVNA V2 plus4.
Please some help, I'm computer illiterate and this is the first time I use
Linux (I'm lost) I install a lot of Python libraries and I get confused
with the " CONSOLE "
|
Re: NanoSaver on ubuntu- mint
toggle quoted message
Show quoted text
On Sat, 19 Feb 2022 at 01:22, Francesco <realfran@...> wrote: Hello, I set up one laptop with Mint Linux "cinnamon" I install NanoVNA
Saver I don't find the "device port" get a problem with the LiteVNA and the
NanoVNA V2 plus4.
Please some help, I'm computer illiterate and this is the first time I use
Linux (I'm lost) I install a lot of Python libraries and I get confused
with the " CONSOLE "
|
NanoSaver on ubuntu- mint
Hello, I set up one laptop with Mint Linux "cinnamon" I install NanoVNA Saver I don't find the "device port" get a problem with the LiteVNA and the NanoVNA V2 plus4.
Please some help, I'm computer illiterate and this is the first time I use Linux (I'm lost) I install a lot of Python libraries and I get confused with the " CONSOLE "
|
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Yes I should check R and may give me a clue.
I have a junk unit that screen broke, I was using with computer and did a update and now won¡¯t come on.
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Re: Unit Won't turn on after charging
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Donald S Brant Jr
Francesco
Mike C.
Alan Brown