Re: the nano android app issues
1 i thought this was supposed to run without the internet Yes it is, but the web app working would show that communication to the nanovna works. and 2 yes my otg cable can see and read a usb memory stick fine You could also try the Serial USB Terminal app ...sending e.g.: help
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Re: the nano android app issues
well a couple of things,1 i thought this was supposed to run without the internet and 2 yes my otg cable can see and read a usb memory stick fine.
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The only part of the Smith Chart that is purely resistive is the center
horizontal line. Upward is inductive and downward from that line is
capacitive. That's the advantage of the Smith Chart. Since the definition
of resonance is that +j = -j (the two cancel) only the central horizontal
line is purely resistive and shows resonance.
Dave - W?LEV
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On Mon, Jan 20, 2020 at 11:22 PM Glen K4KV <glenk4kv@...> wrote: FYI
Ordered via PayPal on Alibaba on 11th, arrived a little bit ago.
First impressions are very good. Very nice box.
Did a CAL using my own sma standards. Then checked 'known' good antennas.
Did not read the instructions, tried to see if it all was intuitive or not.
Was able to scan whatever I wanted to scan, all readings pretty much
what I expected.
Display crisp and very easy to read (hooray for 4"!)
Scanned some filters up to 310Mhz and saw no noise or other difficulties.
I have stuff to learn, like why the Smith reading is R and either
capacitive values or inductive values, not
R +xj (perhaps I needed polar selected). Have not figured out how to
turn most of it off. I want R + xj plus either
return loss or swr on the screen only for most of my needs.
All in all super bargain!
Thanks to all who have contributed!!!
73
Glen K4KV
--
*Dave - W?LEV*
*Just Let Darwin Work*
*Just Think*
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Re: the nano android app issues
Make sure you are using an OTG Cable that tells the tablet to become a USB host. You can verify its in host mode if you're able to read a usb memory stick.?
On Mon, 20 Jan 2020 at 6:06 PM, nanovnauser@...<nanovnauser@...> wrote: Hi all,ive just upgraded my lenovo tab to android ver 7.1.2,the nano web app installed ok but when i try to open it i just get a blank white screen,any ideas?,thanks in advance.
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Re: We started selling nanoVNA-H4 using STM32F303CCT6 and 4-inch LCD
NanoVNA-H4 updated Firmware to the latest version as follows.
All right!
ChibiOS/RT Shell
ch> version
0.4.5-12-gea578a2
ch> info
Kernel: 4.0.0
Compiler: GCC 8.3.1 20190703 (release) [gcc-8-branch revision 273027]
Architecture: ARMv7E-M
Core Variant: Cortex-M4F
Port Info: Advanced kernel mode
Platform: STM32F303xC Analog & DSP
Board: NanoVNA-H 4
Build time: Jan 18 2020 - 22:54:30
ch>
--
*73, Lucio I0LYL Rome, Italy*
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Re: We started selling nanoVNA-H4 using STM32F303CCT6 and 4-inch LCD
Are either of your other two NanoVNA's able to connect to your Samsung Galaxy 8+? NanoVNA WebApp connects to my worse clone from Galaxy Note8 Android 8.0.0 as does Serial USB Terminal by Kai Morich a SMAYS powered hub connects by type C to Note8, and to NanoVNA by Type A to C cable.
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Re: nanovna-saver cal panel won't fit gnome screen
Really? I have used this method for years on a bunch of different Linux distros. Hold down Alt, left click and drag the window any way you want: up, down, sideways, whatever. Something ain't right here.
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On January 20, 2020 2:47:30 PM PST, Nick Kennedy <kennnick@...> wrote:
The trick of using alt + left mouse only allows moving the window down.
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
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Re: *** FIX FOR NANOVNA-SAVER PYQT5 INSTALLATION PROBLEMS ON LINUX MINT 19.3 ***
#nanovna-saver
Thank you, thank you, thank you. Your instructions worked FB on Ubuntu 18.04 -Ed
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Re: the nano android app issues
Hi all,ive just upgraded my lenovo tab to android ver 7.1.2,the nano web app
installed ok but when i try to open it i just get a blank white screen,
any ideas?,thanks in advance. Did you enable experimental web features? /g/nanovna-users/wiki#NanoVNA-Web-Client
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Re: Improving the performance of a pre-V3.4 original Hugen nanoVNA
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Re: *** FIX FOR NANOVNA-SAVER PYQT5 INSTALLATION PROBLEMS ON LINUX MINT 19.3 ***
#nanovna-saver
I OftenUseCamelCase myself
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When uploading files, please try to NOT use spaces in the filename.
Use dashes, underscores or periods.
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
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No problem here plugging in the usb c cable!
Also, I DO see some graphical 'remnants' on the screen from a previous scan..really not too bad though.
73
Glen K4KV
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FYI
Ordered via PayPal on Alibaba on 11th, arrived a little bit ago.
First impressions are very good.? Very nice box.
Did a CAL using my own sma standards.? Then checked 'known' good antennas.
Did not read the instructions, tried to see if it all was intuitive or not.
Was able to scan whatever I wanted to scan, all readings pretty much what I expected.
Display crisp and very easy to read (hooray for 4"!)
Scanned some filters up to 310Mhz and saw no noise or other difficulties.
I have stuff to learn, like why the Smith reading is R and either capacitive values or inductive values, not
R +xj (perhaps I needed polar selected).? Have not figured out how to turn most of it off.? I want R + xj plus either
return loss or swr on the screen only for most of my needs.
All in all super bargain!
Thanks to all who have contributed!!!
73
Glen K4KV
|
|
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Re: *** FIX FOR NANOVNA-SAVER PYQT5 INSTALLATION PROBLEMS ON LINUX MINT 19.3 ***
#nanovna-saver
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the nano android app issues
Hi all,ive just upgraded my lenovo tab to android ver 7.1.2,the nano web app installed ok but when i try to open it i just get a blank white screen,any ideas?,thanks in advance.
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Re: Firmware compatibility
Hugen, Hurt,
I received my NanaVNA-H4 today and I can confirm the upper half blocks the USB. I filed away the upper rim. I did not want to force the USB cable into the receptacle fearing the stress may break the solder connections.
Mike N2MS
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On January 20, 2020 at 11:56 AM Kurt Poulsen <kurt@...> wrote:
Hi Hugen
Just got the NanoVNA-H4 delivered to day. I have some issues which I have raised to the manufacturer as the USB C entry is blocked by the upper half of the case (a rim is not milled away).
Then also there is stray lines as residual if previous traces and also single pixels of different colors is glowing. Eventually these disappear again when written sometime later, when a new trace is "passing by" else they are permanent.
Just to let you know if you do not know this or you know a fix.
The mechanical issue may be fixed by taking the unit apart and mill the excess part away if the case is easy to take apart. Anyway it look very fine and looking forward to try it out.
I have pictures if you are interested so mail me directly to kurt@...
Kind regards
Kurt
-----Oprindelig meddelelse-----
Fra: [email protected] <[email protected]> P? vegne af hugen@...
Sendt: 20. januar 2020 04:18
Til: [email protected]
Emne: Re: [nanovna-users] Firmware compatibility
NanoVNA-H rev3.4 is fully compatible with previous versions of NanoVNA firmware.
The NanoVNA-H4 uses a Cortex-M4 MCU and a 4-inch LCD, so it is no longer compatible with previous firmware versions.
hugen
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Re: We started selling nanoVNA-H4 using STM32F303CCT6 and 4-inch LCD
Thanks Herb. None of my units will connect. Will try the on-line and see
what happens. Would be nice for field use though with my phone.
Merle
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On Mon, Jan 20, 2020 at 5:45 PM hwalker <herbwalker2476@...> wrote: Quite a collection Merle,
Are either of your other two NanoVNA's able to connect to your Samsung
Galaxy 8+? If so, then the nanoVNA-H4 should be able to connect by the
same means. If not, then the C-to-C able also will not work. The NanoVNA
android app is finicky regarding versions and android devices. The webapp
mostly works even when the Playstore apk will not, but you have to be
connected on-line.
- Herb
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Re: USB over CAT5 hardware
This is a good tip. Just remember that the feedline is only a multiple of a half wavelength at one frequency. If that's the center frequency of your antenna then the impedance at the end will be the same as at the antenna, ignoring the effects of attenuation. As you get further of the center frequency there will be some error in the result. This effect may not be important if the number of half wavelengths is not too high.
You can tell if your feed line length is right by measuring with a short at the antenna, assuming the short is not too long.
It is also possible to mathematically transform the result of the VNA to the antenna, but you need to know the impedance of the line, it's length, and possibly it's attenuation.
If it's a coax feedline and has a connector at the antenna you could do the VNA calibration at the antenna. For low frequency you can ignore whatever adapters it takes to use your Cal lot.
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Re: nanovna-saver cal panel won't fit gnome screen
Thanks for the responses.
The trick of using alt + left mouse only allows moving the window down.
There's also a mini-menu if you right click the title bar of the panel with
some promising sounding options including "move" and "resize" but they
don't get you to the bottom of the panel either.
However on another web search today I found a good tip on an Ubuntu site.
If you do alt-F7, you can move the panel any direction, including UP. It
allowed me to do the calibration and load & save results.
Kinda clunky though, so a revision that adds a scroll bar or makes the
panel shorter and fatter would be useful for us notebook users.
73-
Nick, WA5BDU
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On Mon, Jan 20, 2020 at 11:23 AM Nick <g3vnc@...> wrote: On Sun, Jan 19, 2020 at 03:09 PM, Nick Kennedy wrote:
Anyone got a suggestion for this? Hold down the Alt key then left click, drag the window.
HTH
Nick
G3VNC
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Oristo
Jim Allyn - N7JA
Merle W
Nick Kennedy