开云体育

Hi Nels,

Try to replace the calibration wire and / or calibration tools with another one that may be causing the problem.
Follow the calibration sequence, always starting with a Reset first.

It's too late for us, that's all I remembered.

73, Gyula HA3HZ

I suppose that in theory tagging NanoVNA-H with a trademark ? superscript might help but I don't know if that would help on eBay.

I have loaded Mate Ubuntu 19.10 on my laptop.
The biggest problem is where the OS saves the Python files and it's
permissions.
I have gotten the nanoVNA-saver to compile and run and I think it is
talking thru a USB port
to the remote VNA. I say that because because the start and stop scan freq
have changed
to the values on the host program.
But

I get this error:

Failed reading data 1 20 times.

Data outside expected valid ranges, or in an unexpected format.


from reading MSG #4930 from


There are two steps to remedy this:
1) Make sure your NanoVNA is calibrated before you even started. It needs
to be calibrated across the entire range you intend to use it over. Do a
2-port calibration, not just the short-open-load.
2) If that doesn't help, update your firmware to a newer version, such as
edy555's 0.2.3, which fixes some of the transmission errors that were
present earlier.


So after a cal from 50khz to 900mhz as per the guide - I still get errors,

see way to the end of this debug clip:


NanoVNASaver 0.2.0
Copyright (C) 2019 Rune B. Broberg
This program comes with ABSOLUTELY NO WARRANTY
This program is licensed under the GNU General Public License version 3

See for further details
Settings: /home/nels/.config/NanoVNASaver/NanoVNASaver.ini
2019-11-20 13:48:29,793 - NanoVNASaver.NanoVNASaver - ERROR - Tried to open
and failed: [Errno 2] could not open port : [Errno 2] No such file or
directory: ''
2019-11-20 13:48:35,557 - NanoVNASaver.NanoVNASaver - ERROR - Tried to open
/dev/ttyACM0 and failed: [Errno 16] could not open port /dev/ttyACM0:
[Errno 16] Device or resource busy: '/dev/ttyACM0'
2019-11-20 13:49:04,817 - NanoVNASaver.SweepWorker - WARNING - Got a
non-float data value: 2147483647.147483647 2147483647.147483647
(2147483647.147483647)


So I am slowly making success but it is slow, any help and or comments are
appreciated.


Thanks to those who have helped me from this list, THANK YOU!

Thank you for the software: Rune B. Broberg. I think it may work after more
work on my part.

This version of Mate-Ubuntu 19.10 is looking for a tablet to run on and I
have a laptop.

Any desktop with XFCE failed to put the Python files in the correct OS
structure and will not work.


I think I still have a port problem? I am not sure what the normal debug
complaints are on start up.


Sincerely,

Nels

--




n_n

About USBDeview
The following tool is called "USBDeview" developed by Nir Sofer (2006- 2013) - all right reserved), a tool that will allow you to see active and inactive USB devices (ghost USB devices) installed in your Windows computer by their driver name and perform a number of operations on them like uninstall, disable, disconnect, disable + enable and others.
It will allow fresh with a device installation, thus, preventing COM port conflicts and driver update issues.

How to uninstall a device driver with USBDeview
- Download the archive that the version of Windows that you have, from the download links above;
- Extract the archive content on your destop or anywhere on your hard- disk;
- Right-click USBDeview.exe file (the one with a green icon) and select Run as administrator;
- A list of USB devices that are active and connected to your PC will be displayed with a "green light";
- The other USB devices for wich drivers were installed but are currently disconnected from your PC will show up with "gray light" meaning there are not in use or inactive. These USB devices will not show on to the Windows Device Manager;
- Many of this USB devices are left-overs or duplicates that will only cause issues with your PC operation and might lead to conflicts with new driver installation attemps;
- To remove such a USB device driver simply right-click on it and select Uninstall Selected Devices.

A very nice update. This now covers most of the areas that were the most puzzling to me.

One thing I notice is that it assumes a newer firmware level that has the DFU command, etc. I didn't notice mention of using the jumper pins that first time. Likewise the data entry bar with the keyboard Easter egg is unmentioned. Passing mention is made of the changing menus through. I'm guessing that most new users will be starting with a unit at the old initial firmware level so that they could use such information.

Rune,
For what it's worth, HP put "port extension" in the calibrate menus, but put "electrical delay" in the display scaling menu. I don't remember the details, but I think "port extension" actually added a delay twice the ext/c value to account for the round trip in S11.
--John Gord

Port extension very useful. Many cheap sma bnc adapter lossy. Port extension with loss compensation extreme useful.

WOW!??

Go to your local mobile phone shop/kiosk and just buy a thin/low-profile replacement battery and use that - like I did with my first Gecko Nanovna.
I used a small nut as a spacer under each screw to move the rear panel enough for the 800mAH phone battery to fit.

Only if you fear fire and explosions.

Glenn

--
-----------------------------------------------------------------------
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"

On Mon, 18 Nov 2019 at 13:58, RFy <gpdxdveil@...> wrote:

450mAh is... Not suitable for NanoVNA
1. Stand-by draw
2. Charge circuit pushes over 1A( over 2C rate )

My battery already swelled( PCB/LCD curved slightly )

There are some high specification batteries for sale on eBay, at quite a
reasonable cost.




Dave.
--
Dr. David Kirkby,
Kirkby Microwave Ltd,
drkirkby@...

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

The battery was already swollen when I got the nanoVNA. It is now even more swollen. Only used computer USB2.0 ports to charge, not even USB3.0. Never a separate charger
Will contact hugen as I bought from his shop and the battery is glued to the PCB and I do not want to destroy my nanoVNA
--
NanoVNA Wiki: /g/nanovna-users/wiki/home
NanoVNA Files: /g/nanovna-users/files
Erik, PD0EK

For the forum members that are unsure of the safety when charging their Nanos, try to obtain a low-current PolyFuse and place it in series with the positive lead on the battery.
You can find info on Polyfuses here:?
I was looking up specs and found this part series that 'should' probably be OK to use as protection.

I attached the datasheet.
NOTE - these devices are used in most modern battery-powered electroinc devices so go through your junk box to see if there might be anything similar you can use.
On the other hand, stick a 22 to 27 ohm resistor in series with the battery to limit the current.
Cheers,??
Larry

Erik,
You really do not want to screw around with a swollen LiIon or generally any Lithium type battery that is beginning to swell.
All they are good for is taking them outside in a wide open area, banging a nail through and running up-wind of the smoke and fumes! ;-)


But seriously, working in a two-way radio service shop, I come across all shapes and sizes of batteries and we have to bag each Lithium unit that is recycled in order to prevent shorts to other devices.
Why take a chance on a fire. Lithium reacts to air AND water.

Should I be worried?

Not seen a swollen cell catch fie ...yet, but it is rumoured.
More likely to cause physical damage to the VNA, or leak nasty stuff that yu might not want to get on your skin or inhale.
It should should really be removed asap.

73 de Andy

On Wed, Nov 20, 2019 at 08:11 AM, Larry Rothman wrote:

Please DO NOT USE any LiIon battery that is beginning to swell !!!

Should I be worried?


--
NanoVNA Wiki: /g/nanovna-users/wiki/home
NanoVNA Files: /g/nanovna-users/files
Erik, PD0EK

#78'' : #78' was re-corrected :
-
#78' : #78 was corrected :
19 November 2019 - /g/nanovna-users/message/7185
#78: on the measurement of s-parameters using the [LeastVNA] only
18 November 2019 - /g/nanovna-users/message/7162
-
:78''#

OK I started testing the charging current on my NVNA.

Typically 650ma on an empty 400ma supplied cell, oh dear !!!

I wasn't expecting that to be honest, I really did assume that there would be some controller regulating the current.

I consider that the IP5303 datasheet to be a bit misleading in my opinion.

Before I did the test, I also measure the current on a supposedly charged cell, and it wasn't actually any different.

Guess I'll be modding mine for an 18650 cell shortly.

Has anyone got a fire extinguisher that they can lend me ;)

73 de Andy

Tnx Alan
This morning I made new cables with rg142 and I think the double sheild helped a lot...
once again tnx and I am getting happier more I discover those little wonders!
Richard

Well, no surprise. It was a scammer. Got Ebay refund yesterday.

Please DO NOT USE any LiIon battery that is beginning to swell !!!? Recycle it.Once a LiIon battery is starting to swell, its internal chemistry is unstable.