¿ªÔÆÌåÓý

ctrl + shift + ? for shortcuts
© 2025 Groups.io
  1. Nanovna-Users
  2. Messages
Expanded Topics Messages
Date
Re: info update

 

On Fri, Oct 4, 2019 at 02:51 PM, @in3elx wrote:


Thanks. It's all very perfect. I already had these files.
But I asked other questions.

I repeat:
Does DfuSe_Demo_V3.0.6_Setup.exe have 30-day work limitations? Yes or no?
NO


DMR-CLEAR_MEMORY_DFU.dfu is the only file I need to clear the memory?
YES

Shouldn't these other files be used ?:
DMR-color-tweak-sept.29.2019_DFU.dfu
NO
DMR_FILL Flash with FF DFU.dfu
Same as DMR-CLEAR_MEMORY_DFU.dfu
DMR_M_10KHz_sept-13-19.dfu
NO
DMR_nano-white-trace-test.dfu
NO

Thank you again.
Re: info update

 

Really good! Congratulations for your job.
I read it well tomorrow morning.
Thanks
Re: Method of equivalent circuit used on HP 4284A LCR meter

 

Hi David,
thanks for the list! That's a lot of ways to display the same couple of
numbers ;-) But I'm sure all very useful. I'll keep it around for
future reference :-)

--
Rune

On Fri, 4 Oct 2019 at 17:14, Dr. David Kirkby from Kirkby Microwave Ltd <
drkirkby@...> wrote:

There has been some discussion about the best way to represent data
measured as impedance, into an equivalent circuit. The most comprehensive
of these I have seen, which my company owns, is my obsolte HP 4284A
precision LCR meter.




which is *not* a VNA, but measures the impedance of a device using a 4-wire
Kelvin measurement. This means everything shown here could conceivably be
displayed.

Someone *might* want to implement all or a subset of these. *I'm not
suggesting they are all implemented - I am just listing them for possible
discussion. *I suspect my HP 4285A LCR meter (75 kHz to 30 MHz) does the
same, but I have not checked.

*HP 4284A 1 MHz LCR meter. *
Cp-D - a parallel capacitance Cp, with a dissipation fact D
Cp-Q - a parallel capacitance Cp, with a Q of Q
Cp-G - a parallel capacitance Cp, with a conductance G
Cp-B - a parallel capacitance Cp, with a susceptance B
Cp-Rp - a parallel combination of a capacitance Cp, and resistance Rp
Cs-D - a series capacitance Cs, with dissipation factor Q
Cs-Q - a series capacitance Cs, with a Q of Q
Cs-Rs - a series combination of capacitance Cs and resistance Rs
Lp-D - a parallel inductor, with a dissipation factor D
Lp-Q - a parallel inductor, with a Q of Q
Lp-G - a parallel inductor, with a conductance of G measured in siemens
Lp-Rp - a parallel combination of an inductance Lp and resistance Rp.
Ls-Q - a series inductor Ls, with a Q of Q
Ls-Rs - a series inductor Ls with resistance Rs

*R - X - I don't need to explain what that is. *
Z-theta (degrees) - The magnitude and phase of an impedance expressed in
degrees.
Z-theta (rad) - The magnitude and phase of an impedance expressed in
radians.
G-B - G is the conductance measured in siemens (admittance Y = G + j B)
Y-theta (degrees) the magnitude of the admittance Y, and phase angle
expressed in degrees
Y-theta (rad) the magnitude of the admittance Y, and phase angle expressed
in radians

--
Dr David Kirkby Ph.D C.Eng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD,
Essex, CM3 6DT, United Kingdom.
Registered in England and Wales as company number 08914892

Tel 01621-680100 / +44 1621-680100
Re: info update

 

I collected some of this information near the top of Firmware Versions


.. which is at the bottom of Wiki Main Menu page
/g/nanovna-users/wiki
Re: info update

 

Thanks. It's all very perfect. I already had these files.
But I asked other questions.

I repeat:
Does DfuSe_Demo_V3.0.6_Setup.exe have 30-day work limitations? Yes or no?


DMR-CLEAR_MEMORY_DFU.dfu is the only file I need to clear the memory?
Shouldn't these other files be used ?:
DMR-color-tweak-sept.29.2019_DFU.dfu
DMR_FILL Flash with FF DFU.dfu
DMR_M_10KHz_sept-13-19.dfu
DMR_nano-white-trace-test.dfu

Thank you again.
Re: Supply voltage requirement?

 

Mike - Don't use anything else!

The NanoVNA was designed to use only a 5V supply, via the USB port.
The internal charge IC is both a 3.7V LiIon charger and 5V inverter combo - there are lots of comments about that chip on the forum.
The 5V output from that inverter MUST be well regulated as it supplies the mixer (612) chips.
If you want? longer run time - get a bigger Lithium battery. Do NOT use anything else or you'll damage stuff.
I used one from a cellphone that was 1100mAH - it WILL charge - but will take longer.

On Friday, October 4, 2019, 2:30:19 p.m. GMT-4, mike miniver <wa7ark@...> wrote:

Is there an on-board voltage regulator that converts 5.0V from the USB to whatever is used internally?

If so, what external voltage range could be used in lieu of 5.0V from USB (but through the USB connector) to power the nanoVna?

I'm thinking of 4 rechargeable NiMH cells which would be about 5.2V fully charged, and about 4.4V when they need to be recharged?

WA7ARK
Supply voltage requirement?

 

Is there an on-board voltage regulator that converts 5.0V from the USB to whatever is used internally?

If so, what external voltage range could be used in lieu of 5.0V from USB (but through the USB connector) to power the nanoVna?

I'm thinking of 4 rechargeable NiMH cells which would be about 5.2V fully charged, and about 4.4V when they need to be recharged?

WA7ARK
Re: info update

 

Use Chrome Browser with its built-in language translation capability.
Then -? Go to the NanoVNA group webpage at:??? /g/nanovna-users/topics
Look at WIKI and FILES sections at left side of screen.

Italian translation of user manual is available at:?

On Friday, October 4, 2019, 2:04:32 p.m. GMT-4, in3elx@... <in3elx@...> wrote:

On Fri, Oct? 4, 2019 at 06:44 PM, Larry Rothman wrote:


Si prega di utilizzare la sezione WIKI e FILES su questo forum.
( #quoted-73772044 )
Could you be kinder?
I just joined this system (which I don't know).
I don't speak English very well and this is already difficult for me.
If someone can put some links with useful information ... thanks
Re: info update

 

@in3elx wrote:
Is there a document that explains the update procedure for those who have never done this?

The answer is on page 19 of 29 of the document named 'NanoVNA User Guide-English-reformat-Oct-2-19.pdf' that you can find here:

/g/nanovna-users/files/NanoVNA%20User%20Guide-English-reformat-Oct-2-19.pdf

/g/nanovna-users/message/3735


And of course see the wiki:

/g/nanovna-users/wiki/home


@in3elx wrote:
I found the progam DfuSe_Demo_V3.0.6_Setup.exe, but it's a demo. Are there any limitations?

Rob, DfuSe_Demo_V3.0.6_Setup.exe is simply the tool provided by ST in order to program their STM chip used inside the NanoVNA.
You find it here:



Please take a look at this document named 'NanoVNA DFU Firmware Upgrade Guide.pdf' that you can find here:

/g/nanovna-users/message/381

Have a fun!

N.V.
Determining SOLT kit errors via basis pursuit

 

FYI

I have started a thread on EEVblog under this subject line. This is serious math wonk territory, so I don't want to clutter an already very busy list with it.

Have Fun!
Reg
Re: Bad nanovna?

 

Make sure you're measure correct channel. You should see CH1 (not CH0) near blue LOGMAG text with value at the top of screen.
Re: info update

 

On Fri, Oct 4, 2019 at 06:44 PM, Larry Rothman wrote:


Si prega di utilizzare la sezione WIKI e FILES su questo forum.
( #quoted-73772044 )
Could you be kinder?
I just joined this system (which I don't know).
I don't speak English very well and this is already difficult for me.
If someone can put some links with useful information ... thanks
Re: Return Loss

 

RL = -20 * log10( abs(gamma) )

where gamma is a complex reflection coefficient

In order to get negative RL, we needs abs(gamma) > 1, it means that reflected wave is higher than incident wave.
Re: Bad nanovna?

 

Thanks. I did all that, still no S21. I think it's blown up. There is also
an incompatibility between the firmware files I found and the SGMicro
bootloader pgm. It was listed as "new out of box" and the protective screen
plastic has lots of marks on it, though the unit was sealed. Anyone can
seal those plastic envelopes. Now the seller has nothing to sell and does
not respond.

On Fri, Oct 4, 2019 at 1:52 PM hwalker <herbwalker2476@...> wrote:

Ken,
The 2-trace, unshielded ports, black unit is usually delivered
uncalibrated and is not useable out of the box. The following usually gets
it going:

First select "RESET" under the "CAL" menu and then perform the normal
calibration procedure and save to location "0".

On a Windows PC you need to select a firmware with the .dfu extension for
use with the flash utility when upgrading your device.

Herb
Re: Bad nanovna?

Bob Albert
 

I just went through a calibration and save and it seems to be working correctly this morning.? Time will tell.
I almost ordered another unit.? Apparently the prices have dropped significantly.
Bob

On Friday, October 4, 2019, 10:52:20 AM PDT, hwalker <herbwalker2476@...> wrote:

Ken,
The 2-trace, unshielded ports, black unit is usually delivered uncalibrated and is not useable out of the box.? The following usually gets it going:

First select "RESET" under the "CAL" menu and then perform the normal calibration procedure and save to location "0".

On a Windows PC you need to select a firmware with the .dfu extension for use with the flash utility when upgrading your device.

Herb
Re: Bad nanovna?

 

Bob,
If you are using the original firmware that came on your nanoVNA then the symptoms haven't been reported by other members and you may have a hardware problem. If you have upgraded your firmware then there is the possibility that the process did not take correctly and is causing your problems.

Herb
Re: Is there an Android app for the NanoVNA - WebUSB

 

AFAIK, only the dev tree exists - there is no APK app that I can find.
It would be nice if cho45 could convert his webpage to a standalone html file that anyone could run locally.

On Friday, October 4, 2019, 1:40:08 p.m. GMT-4, Oristo <ormpoa@...> wrote:

> You need to be connected to the Internet in order to use the Web interface
because you need to access cho45's webpage.
NanoVNA-Web-Client includes some Android app source.
It is being actively developed, with automated build tools and even unit tests:


Has anyone tried that Android app?
Re: Bad nanovna?

 

Ken,
The 2-trace, unshielded ports, black unit is usually delivered uncalibrated and is not useable out of the box. The following usually gets it going:

First select "RESET" under the "CAL" menu and then perform the normal calibration procedure and save to location "0".

On a Windows PC you need to select a firmware with the .dfu extension for use with the flash utility when upgrading your device.

Herb
Re: Bad nanovna?

Bob Albert
 

Yes blue trace responds properly.

On Friday, October 4, 2019, 10:40:59 AM PDT, <qrp.ddc@...> wrote:

Probably someone tried to measure amplifier with this nanovna and it's CH1 input is burned out. Another possible root of cause - incorrect channel setting for trace.

In order to check, do the following:

1) Open CAL menu and press RESET
2) Open DISPLAY - TRACE and select blue TRACE1, make sure it is enabled
3) return back to DISPLAY menu and open CHANNEL menu and select CH1 THROUGH
4) return back to DISPLAY menu and open FORMAT menu and select LOGMAG
5) try to connect/disconnect CH0 with CH1 with cable and check if blue trace has significant change

if you performed these steps and blue trace does not respond on cable between CH0 and CH1, then your CH1 input doesn't works.
Re: Bad nanovna?

 

I did what you suggested. Nothing change the CH1 display of noise. Bad
unit, I guess. The seller does not respond. Thanks for your input.

On Fri, Oct 4, 2019 at 1:40 PM <qrp.ddc@...> wrote:

Probably someone tried to measure amplifier with this nanovna and it's CH1
input is burned out. Another possible root of cause - incorrect channel
setting for trace.

In order to check, do the following:

1) Open CAL menu and press RESET
2) Open DISPLAY - TRACE and select blue TRACE1, make sure it is enabled
3) return back to DISPLAY menu and open CHANNEL menu and select CH1 THROUGH
4) return back to DISPLAY menu and open FORMAT menu and select LOGMAG
5) try to connect/disconnect CH0 with CH1 with cable and check if blue
trace has significant change

if you performed these steps and blue trace does not respond on cable
between CH0 and CH1, then your CH1 input doesn't works.
35681 - 35700 of 39687