开云体育

hamrad45,
Instead of the old model, I would purchase hugen's latest NanoVNA-H, such as this one at Amazon, .

For about the same price as the older model you will be reviewing a unit that:
1. Has more recent firmware installed that allows operation to over 1000 MHz.
2. Has the TDR option installed.
3. Allows DFU mode to be accessed in firmware which makes upgrading easier.
4. Has the diode already installed that allows battery level display.
5. Has a more finished appearance with a molded case which provides an extra level of protection.
6. Has the USB-C termination resistors installed for more reliable operation with USB-C to USB-C.
7. Comes with an extra USB-C to USB-C cable and better through standard.

Again, this is pretty much at a cost that is comparable in in some case lower than the older version.

- Herb

On Wed, Nov 20, 2019 at 06:37 PM, Andy wrote:

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

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

Hi Andy

- How did you determine "charged"? LED not flashing?

- What did you measure the current with?

- What was the charge source? USB or something else? Need spec please.

Yes… that’s the one to buy… I got the kit with the attenuators. Sometimes they are necessary when the results are too large to fit on the screen. Jeff ve3ak

On Nov 21, 2019, at 7:32 AM, hamrad45 <hamrad@...> wrote:

I would really like to get one of these units to review on my YouTube channel but their are many to choose from and so many dealers. Here is one I found today. Can any one tell me if this is a good one or not. I prefer getting one on Amazon as they have easy returns.



If the link does not work, it is sold by onebird for $59.99.

Thanks for your time and help,

Tom Stiles, YouTube ID - hamrad88

=================== Jeff - VE3AK =====================

"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"

I would really like to get one of these units to review on my YouTube channel but their are many to choose from and so many dealers. Here is one I found today. Can any one tell me if this is a good one or not. I prefer getting one on Amazon as they have easy returns.



If the link does not work, it is sold by onebird for $59.99.

Thanks for your time and help,

Tom Stiles, YouTube ID - hamrad88

Thank you very much,
That got rid of my port ERROR - Tried to open /dev/ttyACM0 and failed

I still have gibberish being swept up
more work to do,
Nels

--




n_n

Larry, thanks for the translated sheet for the FM9688. This sheet refers to there being 4 programmable charging currents. The two lowest might be appropriate for the NanoVNA with original battery. BUT nowhere does the spec sheet say how it is programmed. The assumption is that one needs to specify this to their factory at the time of purchase. Very little chance of sorting this out when buying one or ten through Ebay!

Brian. 5B4AHW

sudo usermod -a -G dialout $USER

replacing $USER with your user name

I guess Rune is working on it but no details.

Sam

Hi Joe,
The keyboard magic corner is shown in the document and is #16 on the list in that section. I will have a look in the firmware section regarding the jumper.?
Although the document is listed as being 'Opensource', I have tried to keep
It close to cho45's original intent. I have made clarifications and added items that were omitted in his original doc. I'm also adding some additional examples at the end. Cho45 has not updated his version since the beginning of October and I am updating my edit twice a month.?
Please let me know if there is anything you feel should be added. In fact, if you or anyone else wants to create/write-up some 'cookbook' type examples of using the NanoVNA, I will add them to the document. I reference all sources.?
RegardsLarry


On Wed, 20 Nov 2019 at 4:49 PM, Joe St. Clair AF5MH<saintc@...> wrote: 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.

Thanks Larry.

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