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New S-A-A-2 variant seen on taobao


OwO 2020/09/12 01:24

There seems to be a new 3.2 inch S-A-A-2 clone with connectors on the
side that just showed up on taobao a day ago. I haven't seen it anywhere
else yet. I am curious how they managed to get the connectors to the
side, it doesn't look like they simply rotated the board because the
dimensions don't check out. The board length is 90mm but the width of
this is listed as 74mm. It would require a lot of layout changes to get
the board length to 70mm. It also doesn't look like they used extension
cables because the screenshot shows a normal S11 electrical length.

C.M. 2020/12/07 19:50

The performance of this unit is good and the cosmetic appearance is also nice. However it has got the USB signals swapped and so it cannot be connected to the PC -- what a shame. It took me quite some time to cut and re-solder the USB lines (thin as hair) on the PCB.

Hector Pascal 2020/12/08 01:26

Banggood has it too.  Price is not too bad.  Specs look like a standard V2.
There is an extra button on the switch side, with a legend that looks like a bit like a stylised "car headlamp".
Can't be backlight I guess, so a display dim/bright maybe?
H-P

C.M. 2020/12/08 04:51

Indeed it is a v2.
That is not a button but just a light-guide for the LED :)

Dragan Milivojevic 2020/12/08 18:12

PCB images?

On Tue, 8 Dec 2020 at 06:15, C.M. <jasoncmcheng@hotmail.com> wrote:

Mike Millen 2020/12/08 17:17

I think I would have made a special USB cable for it, rather than fix
it.  :-)
Just snip, rewire, heatshrink and done.

Mike - M0MLM

------------------------------------------------------------------------
*From:* Dragan Milivojevic [mailto:d.milivojevic@gmail.com]
*Sent:* Tuesday, 8 December 2020, 5:12 pm
*Subject:* [nanovnav2] New S-A-A-2 variant seen on taobao

Siegfried Jackstien 2020/12/08 18:41

hmm i guess its a design fault (maybe with a reason?!?!) ... hopefully
they did not overcome this with a fw that has these two pin changed and
after upgrade to newer fw from group (with normal wired fw) you have to
wire it backwards ... if that is the case its like a kick in the a...

are the pins set in fw?? or in bootloader??

greetz sigi dg9bfc

Am 08.12.2020 um 17:17 schrieb Mike Millen:

C.M. 2020/12/08 17:25

The seller has no feedback at all in the beginning when I reported the USB port not working with the PC. After dismantling the unit and comparing against v2 schematic, I noticed the DP and DM pins connecting to STM32 are reversed.
For me it is easier to rewire the connection (20 minutes with a microscope, sharp blade and fine tip iron) than to check if the port assignment can be swapped by firmware. Anyway it seems the popularity of this device is not high as I did not see much discussion online.

C.M. 2020/12/08 17:25

[Edited Message Follows]

The seller has no feedback at all when I reported the USB port not working with the PC. After dismantling the unit and comparing against v2 schematic, I noticed the DP and DM pins connecting to STM32 are reversed.
For me it is easier to rewire the connection (20 minutes with a microscope, sharp blade and fine tip iron) than to check if the port assignment can be swapped by firmware (modify code, compile and program via SWD port). Anyway it seems the popularity of this device is not high as I did not see much discussion online.

C.M. 2021/01/24 02:13

[Edited Message Follows]

I saw a victim on a Russian forum talking about problems with his device. I cannot help him due to language barrier but probably some other Russian users can relay the message.

This device is based on nanovna v2. It has a different PCB having the buttons on the right hand side. It supports nanovna-qt but you need to swap the usb data pins first. Attached are the internal images. The MCU is GD32 but I stated wrongly as STM32 last time.

C.M. 2021/01/24 02:13

I saw a victim on a Russian forum talking about problems with his device. I cannot help him due to language barrier but probably some other Russian users can relay the message.

This device is based on nanovna v2. It has a different PCB having the buttons on the right hand side. It supports nanovna-qt but you need to swap the usb data pins first. Attached are the internal images.

aleks07111971 2021/01/24 03:45

Russians know everything! :)

Doug Basberg 2021/01/24 14:01

That is what my friend in KGB told me (LOL!)

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