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Hi Anne,

Use some pliers, but be very careful...... Officially you have to use a special tool with controlled torque.

Jos


Op 19-7-2020 om 17:42 schreef Anne Ranch:

Hello,
new user here.
After my new NanoVNA passed? "out of box" check I need to unplug the USB connector.
It won't budge.
Should I get a bigger hammer?
Anne

On Jul 20, 2020, at 4:32 PM, Roger Steyaert <k7rxv@...> wrote:

by this method get the numbers you want.

Reading the original Military Specification for the SMA stated 3 inch
pounds for Brass SMAs. It also limited mates/demates to 500 per pair. So
if you are attaching to a PCB mounted unit, that one also has a limit of
500.

Another source, Wikipedia or Pasternak, perhaps stated 8 inch pounds for
Stainless Steel.

Given my fat fingers that have lost strength and some feeling over the
decades, I thought those were interesting and worth following up. I found
torque wrenches from 200 - 600 USD. I ended up deciding to buy 2 small $4
units. (non-torque). I put one on my finger tight and easily turned it 1/2
turn.

So small wrenches carefully applied to avoid too many mates/demates, and
to avoid stress on the PCB mounted units also.

73

de KEoZUW - John

On Jul 19, 2020, at 7:51 AM, Gyula Molnar <gyula.ha3hz@...> wrote:

Hi Joe Joncas,

You can also use the latest (v0.3.6) version of nanoVNA-Saver on your Windows 32-bit machine if you run it under Python.
To do this, you need to install Python on Windows. Description here: /g/nanovna-users/attachment/10650/0/Installing Python on Windows7-32 for nanoVNA-Saver.pdf
In the group wiki (/g/nanovna-users/wiki) you will find the description under the heading NanoVNASaver, where you can download and read the necessary information by clicking on the blue text.
Once you have installed Python, you will download nanovna-saver 0.3.6 (). You unzip this to the C drive and see what modules need to be installed under Python in "requirements.txt" for nanoVNASaver to work well. The previously referenced Python installation is described in pdf. You will install these step by step and then the nanovna-saver will work on windows 32 bits as well.
It seems Holger can’t or doesn’t want to do this to make the latest nanovna saver work on windows 32-bit machines without Python.
If you want to use it on your MacBook, you can find a "Search" button in the forum where you're right now. Type "macBook" here and the information found there will help you with what you need to do.
I enclose some images, these are screenshots taken on a Windows 32-bit machine and under Python 3.7.4.
I hope I was able to help you get started.

73, Gyula HA3HZ
--
*** If you are not part of the solution, then you are the problem. ( ) ***



<ScreenHunter_07 Jul. 19 16.21.png><ScreenHunter_10 Jul. 19 16.22.png><ScreenHunter_11 Jul. 19 16.23.png>

John,

Thanks. Nice to read that it is possible what I was looking for. Sure.
I discovered that it is possible to position the reference point not only on
the gridlines, but also between them.
However I expected that only integers 0...8 were allowed.
It might be more intuitive when the existing Reference button changes its name
into Reference Position
and a new button in the menu is added with the text Reference Level.
Then the Reference Postion button accepts only integer values between 0 and 8
and the Reference Level button accepts any real value between, for
example,-99.0 and +99.0 (dB).
The chosen Reference value for the (active) channel should then be visible
anywhere along the edge, outside the grid of the display.
In this way you can show the trace how you want it in combination with the
scale setting (scale/div).
If I have it right you now can select any real value for the scale/div as
well.
I think it should then be more intuitive to select from fixed values like
(0.1, 0.2),1, 2, 5, 10, or 20 dB/div.
One of these values are then visible on top of the display.
I have described the LOGMAG but I can imagine that something like written
above can also be made for the other formats.
During a lot of years I have used several type of Scalar- and Vector Network
Analyzers.
With that experience I tried to play with this NanoVna-H4 as the operation of
the buttons is concerned.
May be it is worth to give it a chance for implementation in the NanoVna-H4.

Is it worth to add the limits of what you may use for that selection at the
input field of the num. keyboard?
I have tried to choose a number for the display brightness. Finally I tried
2000,
but is it not more intuitive to select from 1 to 5 as an example?
At the moment I see there always a big integer value with one red digit. Have
these a special meaning?

Hi
I am new to the Nanovna and I apologise if this question has be asked before.
I want to measure soil conductivity and relative permittivity.
Are there standard electrode dimensions and positioning?
I am studying ground wave and NVIS propagation.
Any advice appreciated.
Thank you

Hello group,

I found this 8mm torque wrench on eBay:



It is factory preset for 0.59N-m which is just below the upper limit
for brass SMA connectors. It seems to do the job and the price is
very reasonable for the quality represented.

Might be worth a look. I have no relationship with the seller.

Dave N9ZC