开云体育

Any ideas why the web app won't connect?

search for "web" here:
/g/nanovna-users/wiki

On Sun, Jan 12, 2020 at 09:42 AM, Roger Need wrote:

There is a bug that in nanosaver. You have to multiply the delay by 10 and enter that into offest delay (under Calibration). So instead of 1690 you have to enter 16900 ps.
=====================================================

Roger,
Try the version Rune released yesterday. That bug had been reported before and I believe Rune was going to fix it in the next release.

- Herb

I just opened web app on my Windows 10 computer in Chrome browser, but when I click on Connect, it says "No compatible devices found."

The NanoVNA splash screen says "GEN111.TAOBAO.COM" and using PuTTY on the serial COM port connects to it and reports:
ch> info
Kernel: 4.0.0
Compiler: GCC 5.4.1 20160919
Architecture: ARMv6-M
Core Variant: Cortex-M0
Port Info: Preemption through NMI
Platform: STM32F072xB Entry Level Medium Density devices
Board: NanoVNA
Build time: Aug 2 2019 - 16:40:01

Any ideas why the web app won't connect? Thanks!

-Peter

/g/nanovna-users/topic/nanovna_saver_and_windows_xp/69405140?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,40,69405140

--
*73, Lucio I0LYL Rome, Italy*

NanoVna_Saver shows only lenght, not delay.

On Sun, Jan 12, 2020 at 04:45 AM, Leif M wrote:

I forgot the sign, + is surely not good. Is 1690ps good for a 32cm or one foot
of coaxial?

There is a bug that in nanosaver. You have to multiply the delay by 10 and enter that into offest delay (under Calibration). So instead of 1690 you have to enter 16900 ps.

Hi everyone, I want to use my nanovna with Windows XP I launch the nanovna-saver program but it gives me an error what procedures can I do to make it go
Roberto iw5bsf

On Sun, Jan 12, 2020 at 08:37 AM, <nanovnauser@...> wrote:

is there a nanovna app that works with ver 6.0.1?
=========================================

Per previous group messages on the subject, below Android version 7.0 the only working solution has been to use the web based application at: but it requires that you are connected to the internet.

- Herb

is there a nanovna app that works with ver 6.0.1?

Hans, DJ7BA, wrote:

I do hope you have SimSmith. Excuse me for a non-finished answer. It's after midnight in Germany.

I do have SimSmith and your experience and mine coincide, Hans. Ideally, we want the maximum available power transfer to occur at the antenna feedpoint. However, in a very low-loss system, we may have a system-wide *near-conjugate match* such that given a standard S-unit is 6 dB, the difference may be undetectable by the human ear.

From: roncraig1@...
[]
It is possible to tweak the synthesizer frequency setting to account for any TCXO tolerance. I don't think this function is written into the firmware and if it is not it might be something that could be put in future firmware. There would be a calibration register in Flash memory for freq offset and the firmware would calculate the required synthesizer setting offset to the desired freq.
===========================================

Whilst the NanoVNA series are not designed as high stability frequency standards, I do agree that having the ability to set a "ppm" value for the master oscillator would be a very useful enhancement.

Copied the suggestion to the NanoVNA-F group.

David GM8ARV
--
SatSignal Software - Quality software for you
Web:
Email: david-taylor@...
Twitter: @gm8arv

PS. also not sure how accurate you can be with zero beating. There may be a demodulator low freq rolloff issue..

Hi Herb and Rune
The S21 phase delay has been fixed OK and the S21 group delay are still correct, thank you indeed to Rune
Kind regards
Kurt

-----Oprindelig meddelelse-----
Fra: [email protected] <[email protected]> P? vegne af hwalker
Sendt: 12. januar 2020 00:05
Til: [email protected]
Emne: [nanovna-users] NanoVNA-Saver v0.2.2 #nanovna-saver

Rune has released a "Back From Christmas Update" a few hours ago. See details at: . I'll leave it to Rune to go into any particulars.

- Herb

The nano's have a TCXO module which is not adjustable. The schematic shows a DAC freq trim control line from the uP but I believe all the nano's, beyond perhaps the first ones made, have a TCXO that is not adjustable and their Vcontrol line on the TCXO does not exist. The pad on the TCXO for VC position is just grounded through a zero ohm resistor. You can replace the TCXO with one that does have a Vcontrol but I would not recommend it. The TCXO temp tracking is 0.5 ppm over temp. The initial build tolerance is 1.0 ppm.

The Si5351 has the ability to warp a crystal resonator but since the nano's feeds a clock from the TCXO the warping function will not work.

If you are in fact getting 110 Hz off freq at 10 MHz freq setting you are 11 ppm off freq. This would only be possible if you had a TCXO that did have Vcontrol and it is grounded. You can remove the zero ohm chip resistor to ground on the TCXO Vcontrol pin and put a 0.6v to 3.3vdc variable supply on the pin and see if the freq moves indicating you do have a TCXO with Vcontrol.

The Si5351 has a lot of spurious frequencies and you might be zero beating one of them by mistake.

The nano's should be less then 1 ppm for frequency tolerance.

It is possible to tweak the synthesizer frequency setting to account for any TCXO tolerance. I don't think this function is written into the firmware and if it is not it might be something that could be put in future firmware. There would be a calibration register in Flash memory for freq offset and the firmware would calculate the required synthesizer setting offset to the desired freq.

Thank you so much for the development of the NANO-Saver software. It has
been a blessing in my antenna system work. I do have one request. I
actually like the metric system but many of those that I show the results
have long been English measurement people. In the next iteration of this
software would it be possible to have a choice of metric or English
measurements (Feet vs Meters)? Again, I really appreciate this software and
its functionality.

*Clyde K. Spencer*

Rune,
I'm using firmware 0.4.3Q and the new screen capture module has worked great with all screens I have thrown at it. Thanks for this addition and hope you enjoyed the holidays.

- Herb

On Sun, Jan 12, 2020 at 04:45 AM, Leif M wrote:

I forgot the sign, + is surely not good. Is 1690ps good for a 32cm or one foot of coaxial?
===================================================
For me the easiest way to determine a starting value for cable compensation is to use the TDR function of the NanoVNA (see attachment). It scales the x-values in units of time. The screenshot was taken using the latest version of Rune's excellent NanoVNA-saver application.

- Herb

Interesting. I do not recall having to sudo the previous version. I'm not a programmer, but I'm wondering what changed? The instructions in README.md are the same.

73

-Jim
NU0C

On Sun, 12 Jan 2020 04:36:45 -0800
"Andrew Harmon" <andrew.harmon@...> wrote:

Oh yeah, forgot the sudo step. I knew there was something else I had to do to make this work!
so:
git clone
cd nanovna-saver
sudo python3.7 -m pip install .

I rather like that "stupid switch". All three actions in one place. Handy.

73

-Jim
NU0C

On Sun, 12 Jan 2020 00:05:10 -0800
"hwalker" <herbwalker2476@...> wrote:

On Sat, Jan 11, 2020 at 09:00 PM, DaveH52 wrote:

Did you get rid of that stupid switch?
======================================
Per developer and see attachment:

" - Jog switch sensitivity has been improved.
- Enter DFU (for firmware upgrade) by pressing down the jog switch at power-on. "

So no, the jog wheel switch is still present but usability is supposedly improved. Hopefully that means the switch is now interrupt driven. Looking for some of the first nanoVNA-H4 buyers to post feedback on this subject. I personally haven't experienced any switch related mechanical problems with the nanoVNA-H's that I purchased directly from hugen's Alibaba store (10 for classroom use). I can't comment on the quality of jog switches sourced by other clone manufacturers.

Gabriel Tenna White has said that her coming 3 GHz version of the nanoVNA will use push buttons instead of a multi-function switch. If the multifunction switch really irks you then that will be your best out of the box option.

- Herb

I forgot the sign, + is surely not good. Is 1690ps good for a 32cm or one foot of coaxial?