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Hi Martin

no no, it's a Windows app, although I beleive it could be compiled for nixxies and maccies, maybe even andies but not sure.

Anyway, it's a Windows app and you'll find it here ..



You only need the .exe, the other bon files are the firmware I was working on.

On Tue, Nov 17, 2020 at 04:14 PM, Martin J.K. wrote:

the NanoVNA-App software by One Of Eleven supports display of the
admittance and reactance Smith Charts side by side.
Is that what you are asking?

Hi Martin,

Yes that's the sort of thing, but my understanding is that it is an Android application, but I've not been able to find it.

Do you have a link you could share ?

Regards,

Martin

--
Regards,

Martin - G8JNJ

Hi Arie,
you know that the original creator of NanoVNA-Saver (Rune 5Q5R) will no longer be working on this project from the beginning of this year. Unfortunately, I can also imagine that this was His "swan song." Anyone who has taken it over and will carry it on will probably be able to do it in their spare time as a hobby.
Indeed, there are and are improvements in this topic in other programming teams. Since their developments are ongoing and they are made for their own use, it is up to them to decide when and what to share. Anyone who listens knows what I'm talking about.
Please be patient and you can try this for yourself.

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

LOL

"she" is a spammer bot :D


*73 de Luís, CT2FZI*

*QRV @ 145.300 MHz | **CQ0VMST (VHF REP Monsanto)*
<>



<>


On Wed, 18 Nov 2020 at 04:04, Bob Albert via groups.io <bob91343=
[email protected]> wrote:

What do you want to know about it? It's one of my favorite pieces of
test equipment.
Bob K6DDX
On Tuesday, November 17, 2020, 07:47:50 PM PST, <
barbaradavison935@...> wrote:

Hey everyone!

My name is Barbara and I’m relatively new with Nanovna. Looking forward to
learning more about itso please feel free to message me :)

Thanks!

What do you want to know about it?? It's one of my favorite pieces of test equipment.
Bob K6DDX

Several have alluded to the TRANSFORM button on the NanoVNA, but I couldn't seem to find it on mine. Is this firmware-dependent, or do I need to make it appear by some secret handshake? My NanoVNA is neither a -H nor a -F, but the original.

Again, SimSmith allows for SWR circles (among many additional options). It
can be downloaded at:



An excellent tutorial can be accessed at the following:



Both are freeware.

Dave - W?LEV

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

Martin,

the NanoVNA-App software by One Of Eleven supports display of the
admittance and reactance Smith Charts side by side.
Is that what you are asking?

73
Martin 9A2JK

I had issues with the DfuSe recognizing the Nano VNA, be sure to install
the driver!!!! This step was glossed over in Alan’s video which I followed
as well but it is mentioned in PDF instructions included with DfuSE and is
available on the groups Wiki.

On Mon, Nov 16, 2020 at 6:52 AM Tripp K5TRP <trippsanders99@...>
wrote:

Sometimes when using USB-3 ports it can behave weirdly.

On Mon, Nov 16, 2020 at 9:44 AM Chris Wood via groups.io <g4cws=
[email protected]> wrote:

John

I also updated my H4's firmware recently. I have no expertise in
computers or programming, but since I had an H4 and a Win 10 pc and have

a

high regard for Alan's series of videos - thank you Alan - I followed the
video mentioned here.

Unfortunately in my case, it didn't work. The device went into DFU mode,
but refused steadfastly to appear in the box at the top of the DfuSe

window

- and after a lot of messing about trying to get it to work following the
advice of other contributors here who have had problems, I started again
from scratch re-downloading all the packages to my desktop pc, which runs
Win 8.1. This time it did work.

So I got where I wanted to be but by an unexpected route. You may well

be

absolutely fine, but if you plan to use a Win 10 machine, you might need

to

have something else up your sleeve, just in case.

Good luck

Chris G4CWS













--

73,
Tripp Sanders
K5TRP

I attach the lanyard by removing the screw from at least one standoff (the metal standoffs keep the NanoVNA circuit boards separated) so that there is enough room to slip the lanyard material through the resulting gap between the standoff and the circuit board. Replace the screw(s). No drilling.
73, Doug AA3S

Sometimes when using USB-3 ports it can behave weirdly.

On Mon, Nov 16, 2020 at 9:44 AM Chris Wood via groups.io <g4cws=
[email protected]> wrote:

John

I also updated my H4's firmware recently. I have no expertise in
computers or programming, but since I had an H4 and a Win 10 pc and have a
high regard for Alan's series of videos - thank you Alan - I followed the
video mentioned here.

Unfortunately in my case, it didn't work. The device went into DFU mode,
but refused steadfastly to appear in the box at the top of the DfuSe window
- and after a lot of messing about trying to get it to work following the
advice of other contributors here who have had problems, I started again
from scratch re-downloading all the packages to my desktop pc, which runs
Win 8.1. This time it did work.

So I got where I wanted to be but by an unexpected route. You may well be
absolutely fine, but if you plan to use a Win 10 machine, you might need to
have something else up your sleeve, just in case.

Good luck

Chris G4CWS













--

73,
Tripp Sanders
K5TRP

John

I also updated my H4's firmware recently. I have no expertise in computers or programming, but since I had an H4 and a Win 10 pc and have a high regard for Alan's series of videos - thank you Alan - I followed the video mentioned here.

Unfortunately in my case, it didn't work. The device went into DFU mode, but refused steadfastly to appear in the box at the top of the DfuSe window - and after a lot of messing about trying to get it to work following the advice of other contributors here who have had problems, I started again from scratch re-downloading all the packages to my desktop pc, which runs Win 8.1. This time it did work.

So I got where I wanted to be but by an unexpected route. You may well be absolutely fine, but if you plan to use a Win 10 machine, you might need to have something else up your sleeve, just in case.

Good luck

Chris G4CWS

What about 4" NanoVNA V2 Plus4? The web site remains unchanged since Oct. 16 (a month...). Any news? The Waitlist is active?

73,
Martin, OK1RR

On 11/16/20 6:22 AM, G8DQX list wrote:

Stephen,
I've always assumed that the filtering out of the fundamental or desired harmonic response was performed using a "classic" tapped delay-line digital filter. Assuming that noise is white noise (aka stochastic), then a reduction of bandwidth by ? reduces noise by 3dB, or if 2 sample are averaged, rather than considering a single sample, noise is again reduced by 3dB. In either case, the sweep speed is halved.
Reducing the bandwidth by half, with the same shape factor, would increase the filter's rejection of unwanted mixer products. It's not quite that simple, though, which is why it takes time and cunning to develop new versions of firmware.
So, yes, the nanoVNA has a "real" bandwidth filter in the firmware's signal processing.
HTH, 73, Stay Safe,
Robin, G8DQX
On 16/11/2020 10:04, Stephen Laurence wrote:

May I ask a possibly stupid question?

I understand high-end professional vnas have a real bandwidth filter.

Our nanovnas have a bandwdth setting (on some firmwares -not V2 though), but is this by fft, or just the equivalent of averaging, which also has its own setting.

What is the effective difference between bandwidth and averaging? Both seem to reduce noise floor by a small amount, and slow down the sweep?

In what situations should you use one setting rather than the other (or both)?

Steve L. G7PSZ

The actual filter code is this (from dsp.c). The table is 48 points with 4 or 5 cycles

static const int16_t sincos_tbl[48][2] = {
{ 10533, 31029 }, { 27246, 18205 }, { 32698, -2143 }, { 24636, -21605 },
{ 6393, -32138 }, {-14493, -29389 }, {-29389, -14493 }, {-32138, 6393 },
{-21605, 24636 }, { -2143, 32698 }, { 18205, 27246 }, { 31029, 10533 },
{ 31029, -10533 }, { 18205, -27246 }, { -2143, -32698 }, {-21605, -24636 },
{-32138, -6393 }, {-29389, 14493 }, {-14493, 29389 }, { 6393, 32138 },
{ 24636, 21605 }, { 32698, 2143 }, { 27246, -18205 }, { 10533, -31029 },
{-10533, -31029 }, {-27246, -18205 }, {-32698, 2143 }, {-24636, 21605 },
{ -6393, 32138 }, { 14493, 29389 }, { 29389, 14493 }, { 32138, -6393 },
{ 21605, -24636 }, { 2143, -32698 }, {-18205, -27246 }, {-31029, -10533 },
{-31029, 10533 }, {-18205, 27246 }, { 2143, 32698 }, { 21605, 24636 },
{ 32138, 6393 }, { 29389, -14493 }, { 14493, -29389 }, { -6393, -32138 },
{-24636, -21605 }, {-32698, -2143 }, {-27246, 18205 }, {-10533, 31029 }
};

static int32_t acc_samp_s;
static int32_t acc_samp_c;
static int32_t acc_ref_s;
static int32_t acc_ref_c;

void dsp_process(int16_t *capture, size_t length)
{
uint32_t *p = (uint32_t*)capture;
uint32_t len = length / 2;
uint32_t i;
int32_t samp_s = 0;
int32_t samp_c = 0;
int32_t ref_s = 0;
int32_t ref_c = 0;

for (i = 0; i < len; i++) {
uint32_t sr = *p++;
int16_t ref = sr & 0xffff;
int16_t smp = (sr>>16) & 0xffff;

int32_t s = sincos_tbl[i][0];
int32_t c = sincos_tbl[i][1];
samp_s += smp * s / 16;
samp_c += smp * c / 16;
ref_s += ref * s / 16;
ref_c += ref * c / 16;

}
acc_samp_s = samp_s;
acc_samp_c = samp_c;
acc_ref_s = ref_s;
acc_ref_c = ref_c;
}

On 11/16/20 2:04 AM, Stephen Laurence wrote:

May I ask a possibly stupid question?
I understand high-end professional vnas have a real bandwidth filter.
Our nanovnas have a bandwdth setting (on some firmwares -not V2 though), but is this by fft, or just the equivalent of averaging, which also has its own setting.

A bunch of samples are acquired and then multiplied by sin/cos at a single frequency, and then summed. Essentially it's the same as a single bin of a Discrete Fourier Transform. Since there's no window, the effective filter shape is that for a rectangular pulse, i.e. sin(x)/x

What is the effective difference between bandwidth and averaging? Both seem to reduce noise floor by a small amount, and slow down the sweep?

Not a huge difference. Bandwidth affects a single measurement, averaging does multiple measurements over time. The latter should reduce noise by sqrt(N)

In what situations should you use one setting rather than the other (or both)?
Steve L. G7PSZ

Stephen,

I've always assumed that the filtering out of the fundamental or desired harmonic response was performed using a "classic" tapped delay-line digital filter. Assuming that noise is white noise (aka stochastic), then a reduction of bandwidth by ? reduces noise by 3dB, or if 2 sample are averaged, rather than considering a single sample, noise is again reduced by 3dB. In either case, the sweep speed is halved.

Reducing the bandwidth by half, with the same shape factor, would increase the filter's rejection of unwanted mixer products. It's not quite that simple, though, which is why it takes time and cunning to develop new versions of firmware.

So, yes, the nanoVNA has a "real" bandwidth filter in the firmware's signal processing.

HTH, 73, Stay Safe,

Robin, G8DQX

John,

I can confirm what Christian wrote. I updated the fw on my -H4 a few days ago.

To enter DFU mode, hold down the jog wheel before switching on; switch on; release jog wheel; the screen remains dark (worryingly dark, if you're expecting something on the screen!) and the nanoVNA-H4 is now in DFU mode.

At this point you can connect it to whatever PC you use, and update the firmware. If you're using Ubuntu Linux, I can offer further assistance, otherwise it's back to the Wiki!

HTH, 73, Stay Safe,

Robin, G8DQX

On Mon, Nov 16, 2020 at 11:20 AM, Arie Kleingeld PA3A wrote:

Other priorities. New developpers never picked this up but gave priority to
other issues. I'm not complaining here.

Hi Arie,

Agreed.

I think I've missed the window of opportunity to ask for stuff like this, as the firmware and software is now relatively stable and any updates and enhancements tend to be 'few and far between', as the developers have moved onto 'newer and shinier' things, as we all have a tendency to do once the initial novelty has worn off..........................

Still it's always worth asking.

Because if you don't ask, you don't get :-)

--
Regards,

Martin - G8JNJ

I've suggested this to the developper of nanoSAVER about one year ago. It became an item on his? to do list, but was never done. Other priorities. New developpers never picked this up but gave priority to other issues. I'm not complaining here.

Sure would like to have the admittance circles in nanoSAVER. Not to calculate from series to parallel but as a help for tuning networks.

It just needs some extra grafics, or am I thinking too simple?

73

Arie PA3A


Op 15-11-2020 om 14:41 schreef Martin via groups.io:

On Mon, Nov 16, 2020 at 04:41 AM, alan victor wrote:

I think what Martin would like is the ability to flip the standard chart off,
turn on its admittance form and then the ability to toggle both views on or
create an immittance view.

Hi Alan,

Yes that was my requirement.

I was working my way though one of Owen Duffy's recent blog posts



I agree with his comment that having the Admittance scale would be handy, as I already have enough problems with maths, and any extra help in this respect is definitely of benefit to me.

It is possible to do the mental (calculator or spreadsheet) maths, but sometimes it just helps if you can do it graphically, which is one of the great advantages of the Smith chart as you can form a good 'visual' image of what's going on, which helps you to understand the manipulations you are trying to perform. Which in turn is very handy as a teaching and self-training aid.

--
Regards,

Martin - G8JNJ