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Re: NanoVNA Not Recognized by Laptop over USB After dfu Upgrade

 

Distro is very limited. Doesn't have -w either. I give up on Linux. I can't get the CD drive to load anything else or even to reload the Grml-small I had on there to begin with.

I received my USB-A Male to Male cable. I connected it, with an A-C adapter between the original W10 laptop and the NanoVNA. It gave the same result as the other two cables.

When I said the device was working properly in the analyzer mode I had only looked at boot behavior. I don't remember actually checking it on an antenna. When I connected it to my tuned antenna its readings are different from the SWR meter on my transceiver.

It has also started flashing the white screen momentarily when turning on in the analyzer mode. I don't recall noticing that before.

I think either the device is failing or possibly the hardware was not compatible with the firmware I loaded.

I am officially giving up on trying to figure out what happened. I guess I'll have to take the risk that it won't happen with whatever replacement unit I get.

Going back to vendor tomorrow.

K5TAN

ZZZZ

Out

-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Tim Dawson
Sent: Friday, January 27, 2023 7:40 PM
To: [email protected]
Subject: Re: [nanovna-users] NanoVNA Not Recognized by Laptop over USB After dfu Upgrade

You can still see what is going on without the "-H" option, the output is just a little less clear. Basically, run "dmesg -w", and then plug the USB device in, and you should see the system react to it. (You can also see the same in syslog . . .)

On January 27, 2023 6:33:23 PM CST, Al Waschka <awaschka@...> wrote:
Thanks, I was wondering if that was the cause. I just picked up my ipad to check the syntax but saw your message first.

Greml small was suggested so that is what I loaded. I am running on an old xp box with 1G ram and 1.7 ghz celeron.

I¡¯ll try to find another to load.
On Jan 27, 2023, at 7:27 PM, Tim Dawson <tadawson@...> wrote:

?Looks like a distro with crippled dmesg . . . . the man page clearly states "-H: Human readable output" and "-w: wait" so the options *should* be valid.

On January 27, 2023 6:17:49 PM CST, Al Waschka <awaschka@...> wrote:
Actual response is Invalid parameter, I think
On Jan 27, 2023, at 6:00 PM, Al Waschka <awaschka@...> wrote:
?Hope this isn¡¯t considered off topic. It is about troubleshooting a NanoVNA.

Finally got the greml distro working. When I enter the string you suggested it says -H is unrecognized.
On Jan 27, 2023, at 6:07 AM, Ho-Ro <linuxaudio@...> wrote:

?On Fri, Jan 27, 2023 at 01:59 AM, Al Waschka wrote:


I am trying to get my hands on a Liinux device to see how it
responds in both modes to Linux commands
On Thu, Jan 26, 2023 at 08:50 PM, Al Waschka wrote:

HP Pavilion ZE 4220 Laptop
Old.
Celeron processor over 1 GHz
960MB Ram (1G?)
CD Drive
Ethernet and USB
Al,
You could download a "live" image, no installation required.
For your HW this small "rescue-linux" should be ok:

- Select the "grml-small" "32-bit PC" version, currently this one:

- Burn as ISO to a CD and boot the laptop from this CD.
- Then just type "dmesg -Hw" and connect your NanoVNA.
Look at the responses when switching on / off in various modes (jog pressed / not pressed, BOOT0-VDD shorted / open, etc.).

Martin












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Sent from my Android device with K-9 Mail. Please excuse my brevity.
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