开云体育

On Sat, May 9, 2020 at 05:11 AM, Ian wrote:

...The command data 0, data 1 ... data 6 reads back a 2d array of values, of value less than 1. Does anyone know how these relate to the traces? ...
===========================
Ian,
As Kurt responded, the "data 0" and "data 1" commands return a 101 point 2d array of complex real/imag pair values. To convert the complex values to the logmag trace values displayed on the NanoVNA you have to do the equivalent in Labview to the following pseudo code:

serialport.write ("data 1")
s21 = serialport.read # Get 101 pts from CH1 (i.e. 0.365322053 -0.903783857 .....)
s21_logmag = 20*log10(abs(s21_logmag)) # Compute s21 log magnitude (CH1)

Same procedure for converting "data 0" returned values.

- Herb

The same applies to the data 0

Hi Ian
As you describe it look like it is the S parameter the output consist of, as real and imag part. For the real part 0=50 ohm and 1=infinitum ohm. For the image part short = -1 and open=1 anything between +1 and -1 is an imag S parameter value where 0 is no value at all and in the center of the Smith chart. The traces need two value where you have to calculate what you want to print either real og image of phase or swr and so on.
There is no difference between Smithchart and traces as both the real and imag needed for the calculation the trace numeric values.
Study a touchstone file saved as real/imag and you will see
Kind regards
Kurt

-----Oprindelig meddelelse-----
Fra: [email protected] <[email protected]> P? vegne af Ian via groups.io
Sendt: 9. maj 2020 10:57
Til: [email protected]
Emne: [nanovna-users] NanoVNA commands

Dear All,

I am writing a LabVIEW app to read back data from the Nano VNA.

I can command the nano to sweep, no problems, using the sweep command.
Reading back the data is proving harder.

The command data 0, data 1 ... data 6 reads back a 2d array of values, of value less than 1. Does anyone know how these relate to the traces? What scaling factors do I need?

I know that the Smiths needs 2d per point. But the other traces should only need 1, the frequencies being read using the FREQUENCIES. command.

Regards,


Ian

Dear All,

?I am writing a LabVIEW app to read back data from the Nano VNA.

I can command the nano to sweep, no problems, using the sweep command. Reading back the data is proving harder.

The command data 0, data 1 ... data 6 reads back a 2d array of values, of value less than 1. Does anyone know how these relate to the traces?? What scaling factors do I need?

I know that the Smiths needs 2d per point. But the other traces should only need 1, the frequencies being read using the FREQUENCIES. command.

?? Regards,


????? Ian

Thanks for this topic and the graphics, a clear indication for those contemplating the use of ferrite and effectiveness of passthrough in one topic.

The articles were particularly helpful, thanks for the links.
--
It is better to help than hinder and judge.
Garry
M0MGP....GB6WLB (SES).....GB6NT? (SES)
M5C Contest Group

I just bought the "H" from Gigaparts. Bonus: no long wait for shipping from China!

I'm not married to the -f...

My "H" model from Gigaparts seems to be what you are looking for. The
battery is internal, and seems to last at least 2 hrs. PRobably more. It
has the three test caps (buttons?), has a nice case as well as cables and a
box.

On Thu, May 7, 2020 at 9:30 PM Russell C. Nixon <rcnixon@...>
wrote:

I want to purchase a NanoVNA_f with buttons, battery and case. Is there a
recommended vendor to use?
Thanks,
kf4wxd

--
Paul

W8SBH
?? ?? ????
(this too shall pass)

Hi Luis
The message to Markus was stuck in the outbox, thus delayed
The link for firmware is wrong.
It should be

Kind regards
Kurt

-----Oprindelig meddelelse-----
Fra: [email protected] <[email protected]> P? vegne af CT2FZI
Sendt: 8. maj 2020 16:20
Til: [email protected]
Emne: Re: [nanovna-users] S-A-A-2 Firmware & Software Releases

Hello Kurt,

Hi Kurt,

Links can be found in the Group homepage as well:

/g/NanoVNA-V2

Also, there is no pending message...

Luis CT2FZI

Hello Kurt,

Hi Kurt,

Links can be found in the Group homepage as well:

/g/NanoVNA-V2

Also, there is no pending message...

Luis CT2FZI

Thank you Marcus, as you see I also finally found it
I have created a message in the SAA-2 forum with my quick test. It is not yet approved
Kind regards
Kurt

-----Oprindelig meddelelse-----
Fra: [email protected] <[email protected]> P? vegne af Marcus Gustafsson
Sendt: 7. maj 2020 23:53
Til: [email protected]
Emne: Re: [nanovna-users] S-A-A-2 Firmware & Software Releases

Kurt,

click release and you will find the bin file. Direct link is

Br
Marcus

Interesting reading thanks for sharing.

A quinta, 7/05/2020, 23:20, Herman De Dauw <on1bes@...> escreveu:

You might have better luck asking on the NanoVNA-f forum:

/g/nanovna-f

Larry,
I understand the limitations of the limited range of the NanoVNA. That's why I am working with one cavity and the notch should be within the range of the Nano (~-35-40dB).

Robert
I thank you for the detailed setup but things got in the way and I really haven't had a chance to work with it. What I am trying to look at is the pass and notch on one trace and the SWR on another. Me and Mr Smith and his squiggly lines are not real conversant. I never needed the Smith chart to repair radios so my knowledge base is very limited (but I'm working on it now).

Once I get the 6 cavities working the same, 3 high pass and 3 low pass, I will start working on the interface cables. Then the antenna t cables. This a a very well made set of cavities made from an article in QST in 1972. Insides are silver plated and made by a very good machinist. I have been told once working correctly the set should have over 100dB of isolation and I believe it. I have 1 cavity working that has a 38dB notch and .5 dB loss.

Once I start tying everything together I will use my service monitor with it's tracking generator for the final bench tune.

Retired and now playing.

I want to purchase a NanoVNA_f with buttons, battery and case. Is there a recommended vendor to use?
Thanks,
kf4wxd

YES! I directly grounded the grids in my L-7 some time back and it worked flawlessly. There is a good engineering discussion on the grid circuit issue here:



Scroll down to A Common "Bad Grid Idea" Super Cathode Drive.

See also here:



73

-Jim
NU0C


On Thu, 07 May 2020 09:07:50 -0700
"Shane Youhouse" <shane.youhouse@...> wrote:

Ditch the chokes!

Your bias will vary by the voltage drop caused by the DC Resistance of the choke (which is admittedly small on the 922.... The Sb220 is quite a bit higher.... But it does matter!).

Not to mention, the amplifier becomes inherently more stable with directly grounded grids.

Also, it becomes easier to drive! Which with most xcvrs means lower IMD.

Elevated chokes are a thing of the past. It's not the 60s, 70s or 80s any longer!

--Shane
KD6VXI

Tried that and there is no option to change the icon.

Did it. Thanks.
Leif

In Windows, you could try right clickinging the icon. Then choose properties, there you can see "change Icon".. This works here in Win7

A friend of mine gave me this link . very clear stuf:

Hi Herb
Found it after I do not how many attempts, then sudden the two links appeared
Kind regards
Kurt

-----Oprindelig meddelelse-----
Fra: [email protected] <[email protected]> P? vegne af hwalker
Sendt: 7. maj 2020 16:37
Til: [email protected]
Emne: [nanovna-users] S-A-A-2 Firmware & Software Releases

Gabriel Tenma White posted the following on the groups.io NanoVNA V2 forum:

Firmware release 20200501 & NanoVNA-QT release 20200507

A few long-standing issues are fixed:

Firmware:
- You can now exit USB mode. After closing NanoVNA-QT, long press the middle button on the device.
- TDR for >101 points is now fixed and you can use TDR up to 201 points.
- The alternate numeric input is now implemented. You can enter it by long pressing the middle button when on the STIMULUS>START/STOP/CENTER/SPAN menu item.
- Display bug when all traces are disabled is fixed.

NanoVNA-QT:
- Thru calibration coefficient is now implemented.
- Fixed a bug with calibration save/S parameter export if system language is set to German or Russian.

I flashed the new firmware using the updated NanoVNA-QT software from a Windows 10 x64 installation without any issues. All the fixes Gabriel mentioned above are working.

- Herb