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Re: what does your NanoVNA circuit board look like?

 

Folks:

Regarding batteries, I ordered mine on Banggood, and the description
contained this caveat:



* Batteries are not included because of the safety of international
transportation. But we have reserved a power management IC, you can
weld your own batteries.
Or use other power sources, such as power bank, to supply power to it
through USB interface.
*

Sure enough it doesnt charge, and as they advise above, I run mine off a
USB battery bank. I havent cracked the case to look, but I imagine I will
add a battery sooner or later.

73;
Bob KV4PC

On Sat, Jun 22, 2019 at 1:31 PM Larry Rothman <ac293@...> wrote:

I just received my NanoVNA yesterday and it was shipped without the
battery. I noticed there are unused pads directly below the coil, one of
which connects to VCC batt. There is also a spot for a TF card slot.
I would appreciate if other NanoVNA owners could post photos of their
boards for a comparison to see if there are different versions being sold.
Also, does anyone know if there is a touchscreen calibration routine
available?
Mine is way off.

Thanks
Larry
Markers

 

While playing with NanoVNA Sharp (1.02), I realized there are no marker functions. Do any of the SW people know if markers can be added?
Thanks
Frank
Re: Ordered a VNA, seller no longer listed

 

I wouldn't worry too much about the message "This user is no longer registered on eBay". Often the cause of the message is the seller hasn't paid the fees that are due so ebay suspends the account. Most sellers pay the fees and get the account reinstated; once in a while one fades away, never to be heard from again. Usually the latter happens when sellers having little or no feedback. With an item of this expense the seller most likely will send it with some sort of tracking number attached. If you have a tracking number, go to Postal Ninja and see if the package is enroute. If you don't have a tracking number or the package isn't enroute, submit a refund request and ebay should process it fairly quickly.

Regards,
George
Re: what does your NanoVNA circuit board look like?

 

The firmware I compiled has been optimized for the touch screen of my hardware，Download to to other hardware may require recalibration. You can use the shell connection and calibrate via the "touchcal" command.
Re: what does your NanoVNA circuit board look like?

 

Hugen,
I noticed that the accuracy of the touchscreen is not the best. I was going through the NanoVNA GitHub source and I saw a few calibration and self test routines in control.c .
Do you know how to get to them or do you need to recompile the code with a runtime flag to enable?

Thanks
Re: NanoVNA software on windows 10 x64?

 

On Wed, Jun 26, 2019 at 01:47 AM, <f4htq@...> wrote:


Dear Gen ( i hope Gen is your first name)
Glad to meet you in this forum.
Have you planed to make this C# software open source ?
I have the same question for the 900MHz NanoVNA firmware.
Regards,
David, F4HTQ.
There's no plan for open source nanovnasharp in the short term.
The 900M firmware will comply with the gnu License and open source after fixing some errors.
Re: NanoVNA software on windows 10 x64?

 

Dear Gen ( i hope Gen is your first name)
Glad to meet you in this forum.
Have you planed to make this C# software open source ?
I have the same question for the 900MHz NanoVNA firmware.
Regards,
David, F4HTQ.
Anyone pushed the available firmware versions to their unit yet? Comments?

 

I've pushed both the nanoVNA_900_AA_20190611.dfu and nanoVNA_900_ch_20190505.dfu firmware to my 'Gecko' VNA and have found that they were compiled by gen111.taobao.com as that URL appears on the startup screen under the nanoVNA name.

I would be interested to hear if any others have pushed any of the firmware found in the download archives mentioned previously in this group.

I've noticed that they don't always start up and just hang at the boot screen.

Comments?
Re: what does your NanoVNA circuit board look like?

 

I would check ALL the solder joints.
I thought I got ripped paying $75 for mine, but maybe a better manufacturer :-)
It's all Chinese junk

On 6/25/2019 2:24 AM, Dom Baines M1KTA via Groups.Io wrote:
Thanks Frank, I will take a look at the usb socket soldering. Perhaps that is the issue?
72
Dom
M1KTA
Re: Additional information on Nano VNA

 

mdmcpq.inf c:\windows\inf
usbser.sys c:\windows\system32\drivers

If it is a x64 system, try to modify themdmcpq.inf

[FakeModemCopyFileSection]
usbser.sys,,,0x20

to

[FakeModemCopyFileSection]
;usbser.sys,,,0x20

usbser_mdmcpq_X86.zip
usbser_mdmcpq_X86.zip
usbser_mdmcpq_X64.rar
usbser_mdmcpq_X64.rar

Re: what does your NanoVNA circuit board look like?

 

Thanks Frank, I will take a look at the usb socket soldering. Perhaps that is the issue?
72
Dom
M1KTA
Re: what does your NanoVNA circuit board look like?

 

I connected it to a USB cable and turned it on, nothing. Pulled the USB and there it came up. Plugged the USB in again, and was able to get it to connect to Nanovna sharp (v1.20). Running it in auto update, I can see my tunable filter move without having to hit "get data"

On 6/24/2019 3:10 PM, Dom Baines M1KTA via Groups.Io wrote:
[Edited Message Follows]
[Reason: Grammar :-)]

Tried the gecko version with various different USB cables that do work with phones and other electronics and do NOT see the board either under Linux or Windows.
I might try with an ICSP header.
So that is a big fail for me.
The flux HAS to be cleaned off this is basic QC really. It has started to collect dust/fluff anyway even though has not seen much more than the bench.

72

Dom
M1KTA
Re: what does your NanoVNA circuit board look like?

 

I hooked mine (White Gecko) to a tunable filter (63 to 125MHz) and I was impressed with what I saw S21 and S11 looked lit was when I swepted it at work. I was recently?? laid off (retired?) and want to do some duplexer tuning, and needed something to do it with . I have a sweep gen and hybrid coupler (plus detector) but you cant get return loss
I think it is good enough for most ham work. I'll have to look at some of my antennas

On 6/24/2019 3:10 PM, Dom Baines M1KTA via Groups.Io wrote:
Tried the gecko version with various different USB cables that do work with phones and other electronics and do see the board either under Linux or Windows.
I might try with an ICSP header.
So that is a big fail for me.
The flux HAS to be cleaned off this is basic QC really. It has started to collect dust/fluff anyway even though has not seen much more than the bench.

72

Dom
M1KTA
Re: what does your NanoVNA circuit board look like?

 

It will detune hi freq stuff. Having worked in RF from the KHz to GHz, I know it effects sensitive circuits plus it picks up all kinds of crap. Better off cleaning it off with alcohol then blowing it off. If you dont plow it off, the stuff just moves around the board. I always soaked in 99% IPA (industrial), but above 70% is OK. You can get some 91 to 98 or so at some drugs stores

On 6/24/2019 3:05 PM, Larry Rothman wrote:
Yeah, thinking about it, you don't want any type of organic material around high freq circuits.
(I remember in Jr High, we used weak muriatic acid as a flux when soldering sheet metal.....really low frequency stuff ;) )
Re: what does your NanoVNA circuit board look like?

 
Edited

Tried the gecko version with various different USB cables that do work with phones and other electronics and do NOT see the board either under Linux or Windows.
I might try with an ICSP header.
So that is a big fail for me.
The flux HAS to be cleaned off this is basic QC really. It has started to collect dust/fluff anyway even though has not seen much more than the bench.

72

Dom
M1KTA
Re: what does your NanoVNA circuit board look like?

 

Yeah, thinking about it, you don't want any type of organic material around high freq circuits.
(I remember in Jr High, we used weak muriatic acid as a flux when soldering sheet metal.....really low frequency stuff ;) )
Re: what does your NanoVNA circuit board look like?

 

If the flux is water soluble it definitely must be cleaned off or it will corrode the board.
I worked for a company that partially built their boards to be finished later and they used water soluble flux cored solder.
All of the boards were scrap after 3 weeks.

If the flux is no clean then the flux does not have to be removed.
It is better if it is removed, but, not absolutely required.

Glenn

On 6/24/2019 1:30 PM, Larry Rothman wrote:
A quick comment on the flux residue - it doesn't have to be cleaned if it's the water-soluble type. It looks bad but it's harmless.

Brass shim should work for the shields, but make sure it's not too thin or you'll see something akin to microphonics if the flat surface is able to vibrate.
When I worked at Motorola, we had to mould stiff ribs along the surface of the synth VCO covers to prevent issues caused by even the smallest vibrations.

If you have a local junk/surplus store see if they have any cellphones/pagers/radios that you can pull some shields off of.
Just heat the board up with a heat gun and the shields fall off.

As for the battery, I think the ones that came with one, have it sandwiched between the back cover and the PCB. Maybe some can confirm?


--
-----------------------------------------------------------------------
Glenn Little ARRL Technical Specialist QCWA LM 28417
Amateur Callsign: WB4UIV wb4uiv@... AMSAT LM 2178
QTH: Goose Creek, SC USA (EM92xx) USSVI LM NRA LM SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"
Re: what does your NanoVNA circuit board look like?

 

Thanks Bart.
I figured the battery was wedged in there - probably why the SD card slot wasn't installed.
Re: what does your NanoVNA circuit board look like?

 

I have worked in this industry for long enough to know it does make a difference. The flux attracts moisture and can change parameters. I always use IPA (not the beer) to clean the board off. Be careful on the display some are not sealed, and alcohol can screw it up

On 6/24/2019 1:30 PM, Larry Rothman wrote:
A quick comment on the flux residue - it doesn't have to be cleaned if it's the water-soluble type. It looks bad but it's harmless.

Brass shim should work for the shields, but make sure it's not too thin or you'll see something akin to microphonics if the flat surface is able to vibrate.
When I worked at Motorola, we had to mould stiff ribs along the surface of the synth VCO covers to prevent issues caused by even the smallest vibrations.

If you have a local junk/surplus store see if they have any cellphones/pagers/radios that you can pull some shields off of.
Just heat the board up with a heat gun and the shields fall off.

As for the battery, I think the ones that came with one, have it sandwiched between the back cover and the PCB. Maybe some can confirm?
Re: what does your NanoVNA circuit board look like?

 

That is the one I have, and it seem to work OK

On 6/24/2019 12:13 PM, Dom Baines M1KTA via Groups.Io wrote:
I found that the white version with a gecko on it was a very bad clone.

I would agree. As I have one and there is lots missing :-)
72
DomM1KTA

On Monday, 24 June 2019, 14:37:06 GMT+1, hugen@... <hugen@...> wrote:
gerrykav Jun 6?? #66
Maybe this answers your question, Dan (taken from project website)
??????????????????????????????????????????????????????????????????

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gerrykav Jun 6?? #64
I am not for a second trying to be the IP police here, but in the absence of an explicit license, the standard 'all rights reserved' applies.
/ Gerry
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Daniel Marks Jun 4?? #48
Do you know what license the original edy555 under which the NanoVNA is provided??? Have you corresponded with the author to get permission to use the design?

Dan
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hugen@... Jun 4?? #47
I remade NanoVNA based on edy555 (), but modified
some circuits, added battery management circuits, and redesigned the PCB.
I developed a PC control software can export Touchstone (snp) files which can be used for
various radio design and simulation software.The improved frequency algorithm
can use the odd harmonic extension of si5351 to support the measurement
frequency up to 900MHz.
I sell at cost price in the online store .
Because it's open source hardware, I also shared my circuit diagram,it was soon cloned.
I found that the white version with a gecko on it was a very bad clone.
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