开云体育

Welcome to the forum.
What model did you buy?? There are 4 models: original, -H, -H4, or -F?

Have you fully charged it? If you remove the USB cable and power off - then on does it show the boot screen?

Roger

Try loosening the screws that hold it together and apply pressure to the
display, itself. No guarantees, but this problem has previously been
reported with the associated 'fix'.

Dave - W0LEV

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

Hello. I am new to the group, having just received my new nanovna yesterday. At first, it was working great with the nanovna saver program. Then, it only shows a light blue screen. No display at all. Anyway to recover, or do I need to replace the unit?
Thanks,
Andrew

Bruce,

Adding information to the Wiki, Files and Photos sections of the group is generally done by members.

While the moderators will provide help on how to do that if a member needs that help, we generally limit our activities to ensuring that the list postings remain technical, non-personal and generally on-topic for the lists original purpose.

DaveD (co-moderator/owner)

--
This email has been checked for viruses by Avast antivirus software.

On Tue, Mar 31, 2020 at 03:03 AM, Gyula Molnar wrote:

... please ask me to share the -H4 screenV.py that works for you.
Unfortunately, I got stuck on line 71....
============================================================
Gyula,
After updating to DiSlords latest beta firmware, which corrected a problem with the "capture" console command that caused me to receive the same error message that you are receiving, the attached scripted worked.

Please change line 17 to the port the NanoVNA-H4 is attached to on your PC:
port = 'COM5' # Set the correct comport before running script

From Powershell or the Windows command-line, change directory to the location of the script. Enter the following:
python H4_tk-scrnCapture.py

Every so often I still get a "struc:error" message, but cycling power to the NanoVNA-H4 and re-starting the script usually clears it up.

Good luck and thank you for the contribution to the NanoVNA community that your website provides.

- Herb

Bruce,
The NanoVNA Wiki is a group effort and several of us have added a lot of info there.
So...Why not browse the various threads, gather links you think would be of interest and add them to the wiki or to a PDF document saved to the files section?
Anyone can add to the main wiki page.
Regards,Larry

Would whoever admins the Wiki put all these links in a conspicuous space so that all of them can be easily found without having to search all the messages. That way anyone interested can examine them and use the one(s) of particular interest to them.

BruceN / K4TQL

--
*"To invent, you need a good imagination and a pile of junk"* -- Thomas Alva Edison (1847-1931)

Hi Herb,

please ask me to share the -H4 screenV.py that works for you.
Unfortunately, I got stuck on line 71. Thanks

Otherwise, I had something on the screen in the revision and compiler lines, although I used clearconfig 1234 several times with the terminal program. I wanted to test the screen saver first, but I got stuck.

Thank both of you very much! Great people on this list!

Marko Cebokli

On Mon, Mar 30, 2020 at 03:15 PM, DiSlord wrote:

i fogot copy dsp.c file as result Bandwidth option not work :( (It measure many time, but use only last data)

Now all correct, also i speedup SPI bus, display update should be very fast
=====================================================================
DiSlord,
Bandwidth option seems to be working. I have attached a screenshot showing a 1 kHz BW and 100 Hz BW LOGMAG display (10 kHz - 2 GHz). The noise floor for the 100 Hz BW is noticeably lower.

The SPI bus speedup also is noticeable. The NanoVNA-H4 display update rate is faster than both the NanoVNA (v0.7.1) and NanoVNA-F (v0.1.1) when using the normal 1 kHz BW.

Hope your NanoVNA-H4 arrives soon and maybe 201 pts can be added to the firmware.

Regards,

- Herb

Sorry, then i port code for H4 i fogot copy dsp.c file

As result Bandwidth option not work :( (It measure many time, but use only last data)

Now all correct, also i speedup SPI bus, display update should be very fast

From a course in EMC / RFI I once taught (assuming ideal components):

[image: image.png]

[image: image.png]




*RESISTANCE* *REACTANCE*

Frequency independent Frequency dependent
(Sits on the real horizontal axis (Sits anywhere on the
Smith
of the Smith Chart) Chart but the
horiz real axis)

Can sink power (as in a dummy load) Can store power (as in charge in
a dielectric -
a
capacitor - or magnetic energy in a magnetic

material - a filter choke)

Can not radiate RF energy Can radiate RF energy


Resonance is *defined* where X(L) = X(C)


Dave - W?LEV

<>
Virus-free.
www.avast.com
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<#m_6434894888749294306_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>

On Mon, Mar 30, 2020 at 7:20 PM David Eckhardt via Groups.Io <davearea51a=
[email protected]> wrote:

You can learn a whole bunch and pretty much teach yourself by playing with
SimSmith. I use it extensively. It's free and can be accessed at the
following URL. It also offers some excellent tutorials, but one must first
understand and internalize what a complex impedance truly represents.

Tutorials:

Download:

RFCAFE.com also offers a wealth of good information on the subject in
addition to all things RF.

Dave - W?LEV


<

Virus-free.
www.avast.com
<

<#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>

On Mon, Mar 30, 2020 at 6:26 PM Jerry Gaffke via Groups.Io <jgaffke=
[email protected]> wrote:

Paul,

I got it that you had some familiarity with Smith Charts, and were just
stumped on
why the tutorial was incomplete in identifying the frequencies involved.
I wrote the explanation such that others in the forum could also figure

it

out.

I'm in about the same boat as you.
Slept through EE classes on using the Smith Chart some 45 years ago,
made a career in digital design. Now getting back to my ham radio roots.
It took a few weeks of going over material on the web to get comfortable
with Smith Charts.

I don't feel I have touched bottom unless I can perform the computations.
Python is an excellent choice, complex numbers are implemented in the

core

language.
For example, in Jeff's tutorial

his first example using numbers can be summarized as follows:
Gamma = (Zload - Zo) / (Zload + Zo); If Zload = 50 + j200, then
Gamma = 0.8 + j0.4

Here's a complete python session to duplicate that computation:

def Gamma(Zload, Zo):

... return((Zload - Zo)/(Zload + Zo))
...

Gamma(50+200j, 50)

(0.8+0.4j)

The above example will run the same under Python 3.x as it does under 2.x
Both will give an answer of (0.8 + 0.4j)
But I recommend you stick with Python 3.x, as 2.x is now ancient history.

I'm thinking of someday creating a Python exercise to do the math
(including the plots)
of Jeff's tutorial. Start it out with an introduction to exactly what
complex numbers are.

I agree, a good explanation written for somebody starting from scratch
on such a "complex" subject matter as Smith Charts is not easy to cook

up.

But writing it is a good exercise, you soon realize there are nooks and
crannies
of the subject you haven't quite figured out as well as you thought.

Jerry, KE7ER


On Mon, Mar 30, 2020 at 09:42 AM, Nbridgema wrote:

Jerry, thanks; it was enough to point out that I really hadn't missed

some

piece of information. I understand what you pointed out although I

hadn't

followed it through as thoroughly as you. You were hearing my

frustration of

not being able to follow the statement verbatim.

Now retired, I've been re-engaging with RF electronics, which was a

childhood

fantasy. So I've been looking for tutorials on any number of subjects,

like

the Smith chart (as a refresher), and Python (about which I know less

than

zero, and lack any programming knowledge).

I observe a common denominator: the one skilled in a subject forgets

how

much

they already know that will be required of the listener to understand

their

explanation. And I can't throw stones!! I now know I must have done the

same

thing explaining some aspect of propagation in optical fiber, and saw

the

listener's eyes glaze over!

-Paul
I_B_Nbridgema

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

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

<>
Virus-free.
www.avast.com
<>
<#m_6434894888749294306_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>

On Mon, Mar 30, 2020 at 11:34 AM, DiSlord wrote:

Fix screensot (shold be)
Set minimum freq as 10kHz
Remove DFU menu
====================================================================
See attached screenshot:

1. "capture" console command working again. Thanks!
2. Minimum frequency settable to 10 kHz. Thanks!
3. DFU menu removed.

DISlord, thanks for the quick changes and the 0.8 beta firmware. This firmware version makes the NanoVNA-H4 my preferred device for everyday use.

You can learn a whole bunch and pretty much teach yourself by playing with
SimSmith. I use it extensively. It's free and can be accessed at the
following URL. It also offers some excellent tutorials, but one must first
understand and internalize what a complex impedance truly represents.

Tutorials:

Download:

RFCAFE.com also offers a wealth of good information on the subject in
addition to all things RF.

Dave - W?LEV


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

On Mon, Mar 30, 2020 at 6:26 PM Jerry Gaffke via Groups.Io <jgaffke=
[email protected]> wrote:

Paul,

I got it that you had some familiarity with Smith Charts, and were just
stumped on
why the tutorial was incomplete in identifying the frequencies involved.
I wrote the explanation such that others in the forum could also figure it
out.

I'm in about the same boat as you.
Slept through EE classes on using the Smith Chart some 45 years ago,
made a career in digital design. Now getting back to my ham radio roots.
It took a few weeks of going over material on the web to get comfortable
with Smith Charts.

I don't feel I have touched bottom unless I can perform the computations.
Python is an excellent choice, complex numbers are implemented in the core
language.
For example, in Jeff's tutorial

his first example using numbers can be summarized as follows:
Gamma = (Zload - Zo) / (Zload + Zo); If Zload = 50 + j200, then
Gamma = 0.8 + j0.4

Here's a complete python session to duplicate that computation:

def Gamma(Zload, Zo):

... return((Zload - Zo)/(Zload + Zo))
...

Gamma(50+200j, 50)

(0.8+0.4j)

The above example will run the same under Python 3.x as it does under 2.x
Both will give an answer of (0.8 + 0.4j)
But I recommend you stick with Python 3.x, as 2.x is now ancient history.

I'm thinking of someday creating a Python exercise to do the math
(including the plots)
of Jeff's tutorial. Start it out with an introduction to exactly what
complex numbers are.

I agree, a good explanation written for somebody starting from scratch
on such a "complex" subject matter as Smith Charts is not easy to cook up.
But writing it is a good exercise, you soon realize there are nooks and
crannies
of the subject you haven't quite figured out as well as you thought.

Jerry, KE7ER


On Mon, Mar 30, 2020 at 09:42 AM, Nbridgema wrote:

Jerry, thanks; it was enough to point out that I really hadn't missed

some

piece of information. I understand what you pointed out although I hadn't
followed it through as thoroughly as you. You were hearing my

frustration of

not being able to follow the statement verbatim.

Now retired, I've been re-engaging with RF electronics, which was a

childhood

fantasy. So I've been looking for tutorials on any number of subjects,

like

the Smith chart (as a refresher), and Python (about which I know less

than

zero, and lack any programming knowledge).

I observe a common denominator: the one skilled in a subject forgets how

much

they already know that will be required of the listener to understand

their

explanation. And I can't throw stones!! I now know I must have done the

same

thing explaining some aspect of propagation in optical fiber, and saw the
listener's eyes glaze over!

-Paul
I_B_Nbridgema

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

On Mon, Mar 30, 2020 at 11:49 AM, DiSlord wrote:

I try 12kHz offset (in my last commits i add dynamic update dsp sin/cos table
on offset change, work only on 1kHz step) i don`t see diffrences, but possible
i mistake

Also i try speedup audio codec from 48kHz to 60kHz, it allow speedup sweep and
not lost bandwidth

Its option Bandwidth, you can use generator and send AM modulated signal to CH1 port and see signal spectre. Use Bandwidth and see better and better bandwidth filter of signal

See

Paul,

The groups.io website mangled my python session rather badly.
Here it is in a somewhat more readable form:

#######################
def Gamma(Zload, Zo):
return((Zload - Zo)/(Zload + Zo))

Gamma(50+200j, 50)
#######################

In response to that final line, the python interpreter will print this:
(0.8+0.4j)

Jerry

I try 12kHz offset (in my last commits i add dynamic update dsp sin/cos table on offset change, work only on 1kHz step) i don`t see diffrences, but possible i mistake

Also i try speedup audio codec from 48kHz to 60kHz, it allow speedup sweep and not lost bandwidth

Fix screensot (shold be)
Set minimum freq as 10kHz
Remove DFU menu

Paul,

I got it that you had some familiarity with Smith Charts, and were just stumped on
why the tutorial was incomplete in identifying the frequencies involved.
I wrote the explanation such that others in the forum could also figure it out.

I'm in about the same boat as you.
Slept through EE classes on using the Smith Chart some 45 years ago,
made a career in digital design. Now getting back to my ham radio roots.
It took a few weeks of going over material on the web to get comfortable with Smith Charts.

I don't feel I have touched bottom unless I can perform the computations.
Python is an excellent choice, complex numbers are implemented in the core language.
For example, in Jeff's tutorial
his first example using numbers can be summarized as follows:
Gamma = (Zload - Zo) / (Zload + Zo); If Zload = 50 + j200, then Gamma = 0.8 + j0.4

Here's a complete python session to duplicate that computation:

def Gamma(Zload, Zo):

... return((Zload - Zo)/(Zload + Zo))
...

Gamma(50+200j, 50)

(0.8+0.4j)

The above example will run the same under Python 3.x as it does under 2.x
Both will give an answer of (0.8 + 0.4j)
But I recommend you stick with Python 3.x, as 2.x is now ancient history.

I'm thinking of someday creating a Python exercise to do the math (including the plots)
of Jeff's tutorial. Start it out with an introduction to exactly what complex numbers are.

I agree, a good explanation written for somebody starting from scratch
on such a "complex" subject matter as Smith Charts is not easy to cook up.
But writing it is a good exercise, you soon realize there are nooks and crannies
of the subject you haven't quite figured out as well as you thought.

Jerry, KE7ER


On Mon, Mar 30, 2020 at 09:42 AM, Nbridgema wrote:

Jerry, thanks; it was enough to point out that I really hadn't missed some
piece of information. I understand what you pointed out although I hadn't
followed it through as thoroughly as you. You were hearing my frustration of
not being able to follow the statement verbatim.

Now retired, I've been re-engaging with RF electronics, which was a childhood
fantasy. So I've been looking for tutorials on any number of subjects, like
the Smith chart (as a refresher), and Python (about which I know less than
zero, and lack any programming knowledge).

I observe a common denominator: the one skilled in a subject forgets how much
they already know that will be required of the listener to understand their
explanation. And I can't throw stones!! I now know I must have done the same
thing explaining some aspect of propagation in optical fiber, and saw the
listener's eyes glaze over!

-Paul
I_B_Nbridgema