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Hugen's redesign of the original nanoVNA used harmonics to provide a stated response up to 900MHz.

Since the original design, additional testing has proved that depending on who manufactured the device and when, it was capable of 1500MHz and most firmware now allows the user to enter that as a top frequency. The caveat is that the clock chip fundamental is only spec'ed for 260MHz max and pushing it to 300MHz might not work.

Look at QRP's firmware - he has a built-in power-on test that checks the clock to see if it's stable at 300MHz and hugen created a firmware update that tops out the clock at 266MHz to guarantee 50KHz to 800MHz on all devices (as some users had issues with the 900MHz max freq).


However, the DEFAULT frequency range is still up to 900MHz - that is why when you install even the latest firmware (other than hugen's 800 version), it boots up at 50KHz to 900MHz.

You see them advertised as 900MHz devices because almost all Chinese vendors copy each others advertising info written in English and don't change much.


There have been many improvements since then including layout improvements to the circuit board that allows fairly good results up to about 1.3GHz.

All this info is contained in the almost 10,000 forum posts (!) should you want to try browsing the various topic threads.

Clear as mud?

From the link at the Wiki section:


It states that top frequency range is 900MHz:

--------------------------------------------------------------------------------------------------------
nanoVNA-H commercialized by Hugen reduced cost and enhanced usability

working LiPo
refined touch screen
better PCB layout, RF shielding
third harmonic operation 300-900MHz
Touchstone file export
standalone PC software
--------------------------------------------------------------------------------------------------------

According to this it seems the 1.5GHz top frequency for the H version was not implemented since the beginning, but was rather a later improvement? If so I would assume there might still be earlier legitimate H units out there being advertised as 900MHz top frequency, specially by non tech savvy sellers. Or am I wrong?

Hi
Seems to work ok and not crash when on continuous sweep.
Thanks Rune

I agree, they're very difficult to connect and disconnect. Here's an outlandish idea I considered...Amazon has U.FL to panel female SMA connector jumpers in lengths up to 12 inches. IF someone REALLY wanted to have a permanent fixture you could get one for each demo section and build yourself a complete demo box; that way you'd only have to connect them up once and could then tap into whichever of them you wanted to. Guess you'd have to characterize the jumpers as well...but I digress. Yep, it sounds ridiculous I agree and did I say expensive? They're around $12 for four jumpers...you do the math since you could buy a couple more nanoVNAs for the money you'd invest in such a project...but it would work. 73 - Dino KL0S

Hi. Has the Save/Reteive Settings feature ever been implemented? Seems like I have seen a post that said it was but can't find it in the program. Thanks all.

Ken

On Fri, Jan 17, 2020 at 08:07 AM, Rune Broberg wrote:

So 3.7 it is, though it might work with 3.6 - I
just don't test it with that. :-)

Does not work with python3.6 here.

nick@LM19-3:~/nanovna-saver-0.2.2$ python3.6 ./nanovna-saver.py
Traceback (most recent call last):
File "./nanovna-saver.py", line 17, in <module>
from NanoVNASaver.__main__ import main
File "/home/nick/nanovna-saver-0.2.2/NanoVNASaver/__main__.py", line 21, in <module>
from PyQt5 import QtWidgets, QtCore
ImportError: cannot import name 'QtWidgets'

All good with python3.7 of course.

On Thu, Jan 16, 2020 at 04:05 PM, Pierre Martel wrote:

Anyone can report what version and linux distro they are using where
NanoVNA-saver works right away?

Pierre

The instructions at used to work perfectly on Linux Mint 19 before PyQt5 got changed back in December.

What distro are you using?

If it is Debian based please try the suggested edit to ~/nanovna-saver/requirements.txt See post #9737.

Nick

On Thu, Jan 16, 2020 at 10:39 PM, Denis Collins wrote:

den@den-ThinkPad-T520 ~/nanovna-saver $ pip3 -V
pip 19.3.1 from /usr/local/lib/python3.6/dist-packages/pip (python 3.6)

Interesting. That's a much newer version of pip3 than you get from the python3-pip in the LM repos.

How did you install pip3 19.3.1?

Please can you do

$ which pip3

and post the result?

Did you get the PyQt5 error when you tried to install PyQt5==5.14.1 with your version of pip3?

Glad the requirements.txt hack worked for you.

Nick

I also suggest getting the Kindle book by Christoph Schw?rzler. It's very useful.

--
Trystan

Hi all,
I have uploaded a *potential* fix for the 0.2.2 crashes seen when running
continuous sweeps following an in-application calibration. It's available
on GitHub as a .exe:



(Look for 0.2.2-1)

If you are experiencing this problem on Linux or Mac, you can pull from the
Development branch on GitHub for now - if this is confirmed to fix the
problem for users other than me, I will make a proper 0.2.3 release soon :-)

--
Rune / 5Q5R

Hi Nick , many thanks for your suggestion.
After installing the python 3.7 I modified the requirements.txt ( ptyq5==5.13.2) and the command
$ python3.7 -m pip install -r ./requirements.txt
works ok installing all the modules.
Now I'm able to use nanovna-saver on my LINUX distro that is :
Ubuntu 18.04.3 LTS
Best regards
73 de IZ1MDJ Maurizio

Hi Bob,
I develop using Python 3.7 - I'm keeping back from upgrading to 3.8, even
though I probably should, because of all the problems of particularly Linux
distributions not keeping up with stable versions of Python. Python 3.7 is
over 18 months old by now. So 3.7 it is, though it might work with 3.6 - I
just don't test it with that. :-)

In recent releases, Python has added a number of features which makes it
more of a "grown up" language, such as types. For development, I consider
these to be essential features.

I hope you enjoy using NanoVNA-Saver in any case!
--
Rune / 5Q5R

Hello Nick,

I went back and re-read your post and sure enough explicitly adding the version number to PyQt5 in the requirements.txt file fixed the issue for me. Many thanks for taking the time to sort this out and I am now a happy 0.2.2 user. My thanks to all the others who posted as collectively I gained a lot of information.

73, Graeme ZL2APV

Hello to all who have replied and all the hints have been really helpful.

I have installed python3.7 using the deadsnakes ppa with no problems there and have loaded pip3 from the Linux Mint repository. I upgraded numpy, scipy and pyserial using the command ...
pip3 install numpy

and the same for the others but when I came to install pyqt5 I get the following message

gvj@GVJ-Lap /opt/nanovna-saver-0.2.2 $ pip3 install pyqt5
Collecting pyqt5
Using cached
Complete output from command python setup.py egg_info:
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/usr/lib/python3.6/tokenize.py", line 452, in open
buffer = _builtin_open(filename, 'rb')
FileNotFoundError: [Errno 2] No such file or directory: '/tmp/pip-build-eq4tkoh9/pyqt5/setup.py'

----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-eq4tkoh9/pyqt5/
gvj@GVJ-Lap /opt/nanovna-saver-0.2.2 $

I have removed the distro installed PyQt5 but it still would not install with pip3 so from here I am lost.

For completeness here are the install messages for the ones that worked.

gvj@GVJ-Lap /opt/nanovna-saver-0.2.2 $ pip3 install scipy
Collecting scipy
Downloading (26.1MB)
100% |████████████████████████████████| 26.1MB 60kB/s
Collecting numpy>=1.13.3 (from scipy)
Downloading (20.1MB)
100% |████████████████████████████████| 20.2MB 79kB/s
Installing collected packages: numpy, scipy
Successfully installed numpy-1.18.1 scipy-1.4.1
gvj@GVJ-Lap /opt/nanovna-saver-0.2.2 $ pip3 install pyserial
Collecting pyserial
Downloading (193kB)
100% |████████████████████████████████| 194kB 4.9MB/s
Installing collected packages: pyserial
Successfully installed pyserial-3.4

73, Graeme ZL2APV

On Thu, Jan 16, 2020 at 01:16 AM, Graeme Jury wrote:

Alberto, are you a member of the dialout group? If not this is likely to be
the reason for needing root access.

Graeme

=============================

Graeme, you are perfectly right ! Adding my user to the dialout group eliminated the need of running under sudo.

TNX

Alberto

Nick

Thanks for posting. Your suggestion to edit requirements.txt worked perfectly for me on LM19.2!

First a quick look at pip3 version....

den@den-ThinkPad-T520 ~/nanovna-saver $ pip3 -V
pip 19.3.1 from /usr/local/lib/python3.6/dist-packages/pip (python 3.6)

Then edited requirements.txt as per Nick's posting and issued the following command.....

den@den-ThinkPad-T520 ~/nanovna-saver $ python3.7 -m pip install -r ./requirements.txt
Collecting scipy (from -r ./requirements.txt (line 1))
Downloading (26.1MB)
100% |████████████████████████████████| 26.1MB 50kB/s
Collecting pyqt5==5.13.2 (from -r ./requirements.txt (line 2))
Downloading (62.2MB)
100% |████████████████████████████████| 62.2MB 23kB/s
Collecting pyserial (from -r ./requirements.txt (line 3))
Downloading (193kB)
100% |████████████████████████████████| 194kB 4.6MB/s
Collecting numpy (from -r ./requirements.txt (line 4))
Downloading (20.1MB)
100% |████████████████████████████████| 20.1MB 43kB/s
Collecting PyQt5_sip<13,>=4.19.19 (from pyqt5==5.13.2->-r ./requirements.txt (line 2))
Downloading (261kB)
100% |████████████████████████████████| 266kB 1.3MB/s
Installing collected packages: numpy, scipy, PyQt5-sip, pyqt5, pyserial
Successfully installed PyQt5-sip-12.7.0 numpy-1.18.1 pyqt5-5.13.2 pyserial-3.4 scipy-1.4.1
den@den-ThinkPad-T520 ~/nanovna-saver $ python3.7 nanovna-saver.py
NanoVNASaver 0.2.2
Copyright (C) 2019 Rune B. Broberg
This program comes with ABSOLUTELY NO WARRANTY
This program is licensed under the GNU General Public License version 3

See for further details
Settings: /home/den/.config/NanoVNASaver/NanoVNASaver.ini

Larry and Oristo have put in a lot of time and effort assembling information in the Files and Wiki sections of this group. For whatever reason the same "What is the correct calibration procedure", "How do I install …", "What is the difference .." questions continue to be asked by new comers. It may be because a lot users are used to having some type of FAQ available when learning a new device or software and get lost without one.

I noticed there are at least a couple of technical writers in our group who might be willing to format a FAQ page that members could contribute to so as not to put the burden of providing content on any one person. We all have different areas of expertise and could provide some pretty diverse content. Some of the FAQ content would probably be no more than links to the appropriate material already in the Files and Wiki section.

- Herb

No - freq range is 50KHz to 1.5GHz on ALL NanoVNA units, except some cheap Chinese copies that were not built well or had shields.
Read the hardware section of the Wiki.
ALL NanoVNAs sold were a redesign by hugen.The original designer, edy555, asked hugen to change the name of his re-design, so he added the -H after the name.hugen also made some minor imporvements.
Use the resources on the forum - you will find A LOT of answers to what you're looking for.
Refer to the links in the Wiki to various User Guides as well for additional model info.
...Larry

ok .only frequency range is different
nano vna 50khz-900mhz
nano vna-h 50khz -1.9ghz