Date   

Re: Latest version of NanoVNA-Saver locking up for some reason

Ron Webb
 

I upgraded to test 1500Mhz-sweep then went back to August

On Sun, Sep 15, 2019 at 00:18 Rune Broberg <mihtjel@gmail.com> wrote:

Hi Ron,
I pushed a fix to the first bug you mentioned. I think the locking up
problem is due to your NanoVNA not responding to requests by the program to
set a sweep span (or possibly because you are trying to run a 0 span
sweep).

Which firmware are you using?

--
Rune / 5Q5R

On Sun, 15 Sep 2019, 02:30 Ron Webb, <bigron@gmail.com> wrote:

I have had the same exact issues in Ubuntu Linux. One little oddity I've
noticed and don't know how to fix while in Ubuntu is that I have to run
NanoVNA-Saver with elevated privileges to actually connect to device
("sudo
python3 nanovna-saver.py") to start. When it locked up, as it did in
Windows 10, this time I saw a some type of message which I did not see in
Windows:


Traceback (most recent call last):
File "/home/ubuntu/Git/nanovna-saver/NanoVNASaver/NanoVNASaver.py",
line
702, in dataUpdated
if self.dataLock.acquire(blocking=True):
KeyboardInterrupt
The X11 connection broke: I/O error (code 1)
XIO: fatal IO error 0 (Success) on X server ":0"
after 984 requests (731 known processed) with 0 events remaining.


I had to force it to quit, so maybe that is all this is about, but it
brought something up about "dataLock" I thought MIGHT have something to
do
with the lock up, I'm not sure though.





--
Sent from Ron Webb's iPad using Gmail Mobile


Re: nanoVNA Real Resistance Measurement Range

dl4raj
 

Hi Kirby,

the attachments have loaded up with my second posting.
I'm aware that they contain nothing new for you but maybe for some other readers
and they show the intended use i.e. to characterize the impedance of components but not antennas.

73
Clemens
DL4RAJ


Re: NanoVNA firmware extended to 1500MHz with added scan command

tinhead
 

convert to hex, save it, open hex and convert to dfu


Re: NanoVNA does not want to start -solved

tinhead
 

all caps replaced, inductor as well, i found even recommended parts, but still it does not work anymore. By closer look on the design, well, it works exactly as it should - it is power bank IC, it does power on with click on key, and power off with double click on key, while charging key is not working. So i added key button and happy with it.


Screen Protector

Mike Cohen
 

Just applied a screen protector to my NanoVNA.

Tech Armor HD Clear Plastic Film Screen Protector (NOT Glass) for New 2019
Apple iPhone 11 / iPhone Xr - Case-Friendly, Scratch Resistant, Haptic
Touch Accurate [4-Pack]

https://www.amazon.com/Tech-Armor-Protector-Case-Friendly-Resistant/dp/B07GZZXC78/ref=sr_1_14?keywords=tech+armor+screen+protector&qid=1568568369&s=gateway&sr=8-14

Note that this is a plastic screen protector that is easily cut to size
with a scissors. Most new screen protectors are ballistic glass that
cannot be (easily) cut without shattering.

Mike - AD4MC


Re: NanoVNA bricked

QRP RX
 
Edited

Adrian Waiblinger, if it shows that there is bad state in firmware, then it seems that memory is corrupted, so the only way to flash it is to use ST-LINK

Just use instruction above. If something will going wrong during flashing with ST-LINK, then use menu Target => Erase chip. It will clean all memory, so you will be able to flash it like new one with menu Target => Program and verify.


Re: nanoVNA Real Resistance Measurement Range

Dr. David Kirkby from Kirkby Microwave Ltd <drkirkby@...>
 

On Sun, 15 Sep 2019 at 17:21, dl4raj <cpaul@gmx.net> wrote:

Ho George,

To my knowledge there are only a few amateur IV 1 port analyzers. The
EU1KY is one, a well as the AIM4170.

I cannot speak for the EU1KY but the AIM 4170 is definitely no IV analyzer.
Look at the circuit diagram on the W5BIG homepage.
(P.S. I own one myself.)
For more info on the IV method I've attached two HP/Agilent papers.
As you can see the HP impedance analyzers using this method start from
1MHz upwards
and they need quite sophisticated circuitry.

73
Clemens
DL4RAJ

I don’t see any attachments, but I am aware of the technique. I have an HP
4291B which uses the RF-IV method. Mine covers 1 MHz to 1.8 GHz, but later
instruments cover up to at least 3 GHz.





--
Dr. David Kirkby,
Kirkby Microwave Ltd,
drkirkby@kirkbymicrowave.co.uk
https://www.kirkbymicrowave.co.uk/
Telephone 01621-680100./ +44 1621 680100

Registered in England & Wales.
Company number 08914892.
Registered office:
Stokes Hall Lodge,
Burnham Rd,
Althorne,
Chelmsford,
Essex,
CM3 6DT,
United Kingdom


Re: nanoVNA Real Resistance Measurement Range

dl4raj
 

Obviously the attachments did not load up for some reason.
So I give it a new try...

73
Clemens
DL4RAJ


Re: nanoVNA Real Resistance Measurement Range

dl4raj
 

Ho George,

To my knowledge there are only a few amateur IV 1 port analyzers. The EU1KY is one, a well as the AIM4170.
I cannot speak for the EU1KY but the AIM 4170 is definitely no IV analyzer.
Look at the circuit diagram on the W5BIG homepage.
(P.S. I own one myself.)
For more info on the IV method I've attached two HP/Agilent papers.
As you can see the HP impedance analyzers using this method start from 1MHz upwards
and they need quite sophisticated circuitry.

73
Clemens
DL4RAJ


Re: New, disappointed member intro

Larry Rothman
 

John,
Have a look at what I did to my device:
https://groups.io/g/nanovna-users/files/Hardware%20Mods/NanoVNA%20Jog%20Switch%20Modification.pdf

To remove the rocker, start with the two tabs at the very edge of the PCB. The switch can then be lifted slightly to help unsoldering the 3 other tabs.

I was thinking that the button flex PCB could be found on older junk cellphones or tablets or cordless phone.

Larry


Re: NanoVNA bricked

Oristo
 

I am trying to jumper the boot to Vdd with a wire with alligator clip on each end.
So it's still booting normally with regular screen,
so wondering if there are any special tricks to getting the jumper connection,
or a better too like the connectors used for logic probing?
Overkill works for me:
http://ormpoa.altervista.org/nanoDFU.htm


Re: New, disappointed member intro

hwalker
 

John,
You'll have to search through the board, but a couple of posts have provided replacement sources for the multi-purpose switch. In the Wiki section there is a mod (https://groups.io/g/nanovna-users/files/Hardware%20Mods/NanoVNA%20Jog%20Switch%20Modification.pdf) for replacing the switch with a 3-button alternative like you suggested. I find the touch screen to be easier for navigating the device and really only use the switch for marker placement.


Re: New, disappointed member intro

John
 

Thanks for all the replies. I've connected the NanoVNA to my PC (Windows 7)
and it's working OK. I've even had a quick scan through the manual...

I don't have a can of compressed air. I could flush the switch out with a
jet of isopropanol and see what happens. I could replace the switch if I
had one, I have access to a reasonable rework station and a good
stereomicroscope, but I haven't found a source of that particular switch.
Actually I don't like the switch, not because it doesn't work but because
it sticks out and looks fragile. I'd rather have a row of three tiny push
buttons just accessible from the edge of the board. I'll have a look at the
circuit diagram. It should be easy enough.

If the supplier offers to ship another immediately and trust me to send the
faulty one back then I'll wait. If not I might just hang on to this one on
the basis that a VNA in the hand is worth two in the post.

I've tried the touch screen and it works OK.

John

On Sun, 15 Sep 2019 at 13:52, Larry Rothman <ac293@rogers.com> wrote:

Hi John,
Please remember that you can use this device via the touchscreen. However,
make sure to calibrate and save the touchscreen parameters. I created a
wiki entry on how to do that if your device has the default firmware.
73
Larry




Re: NanoVNA bricked

David J Taylor
 

From: Bruce KX4AZ

I am trying to jumper the boot to Vdd with a wire with alligator clip on each end. So it's still booting normally with regular screen, so wondering if there are any special tricks to getting the jumper connection, or a better too like the connectors used for logic probing?
=========================

Bruce,

I just bent 24 swg tinned copper wire into a "U" shape, tweaked the space so that it held itself into position to get the white-screen boot.

Cheers,
David GM8ARV
--
SatSignal Software - Quality software for you
Web: http://www.satsignal.eu
Email: david-taylor@blueyonder.co.uk
Twitter: @gm8arv


Re: List of NanoVNA Console Commands

Oristo
 

How does one enter console commands in a Windows 10 environment...use a terminal program to connect via a USB COMx connection?
PuTTY https://putty.org/
https://store.chipkin.com/articles/using-putty-for-serial-com-connections-hyperterminal-replacement/


Re: NanoVNA bricked

Bruce KX4AZ
 

I am trying to jumper the boot to Vdd with a wire with alligator clip on each end. So it's still booting normally with regular screen, so wondering if there are any special tricks to getting the jumper connection, or a better too like the connectors used for logic probing?


Re: List of NanoVNA Console Commands

Bruce KX4AZ
 

As a newcomer to much of this I have a simple question that gives away my inexperience...

How does one enter console commands in a Windows 10 environment...use a terminal program to connect via a USB COMx connection? I am assuming a command prompt window would not work. Or is entering console commands just a Linux only thing? Thanks in advance for "dumbing it down" for me.


Re: Using Linux CLI dfu-util question.

Andy 'FTD <punkbiscuit@...>
 

Thank you Rudi.
I've archived your post for future reference.
Many thanks.

73 de Andy


Re: List of NanoVNA Console Commands

 

Hello,

From the calibration and measurement results of full one-port measurements
of the reflection coefficient of a constructed experimental one-port black box,
we concluded by trial-and-error that, as it seems, the 1st line from below in p.1
of "NanoVNA Console Commands 8-6-19.pdf", that is this one:

"NOTE: need to determine what the output parameters above represent."

which is referenced to the Console Command "data", is redundant, at least in
this case, because, the values in the two 2 columns are - from left to right -
the Real part and the Imaginary part, respectively, of the reflection coefficient.

Sincerely,

yin&pez@arg


Re: New, disappointed member intro

Larry Rothman
 

Hi John,
Please remember that you can use this device via the touchscreen. However, make sure to calibrate and save the touchscreen parameters. I created a wiki entry on how to do that if your device has the default firmware.
73
Larry

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