Author Topic: NanoVNA V2 aka S-A-A-2 (Read 98450 times)

Noy · « **Reply #50 on:** June 25, 2020, 01:05:23 pm »

My 3D printer is taken apart

... so currently i have to buy the box unfortunally..

Gandalf_Sr · « **Reply #51 on:** June 25, 2020, 02:12:27 pm »

Quote from: Noy on June 25, 2020, 01:05:23 pm

My 3D printer is taken apart ... so currently i have to buy the box unfortunally..

Maybe you can send files to an online company to print them for you?

G0MJW · « **Reply #52 on:** June 29, 2020, 10:26:49 pm »

Quote from: OwO on June 25, 2020, 04:02:54 am

Look forward to a 6GHz design soon. There are 3 competing players all working on their own 6GHz design; one of them even hired edy555/ttrftech. How come they are paying to develop their own design rather than wait for the OwOComm one and just clone it (which is allowed)? That is left as an exercise to the reader

Can you slow the development down a bit, I can't keep up! 0.9 GHz, now 4.4 GHz, next 6 GHz.

Noy · « **Reply #53 on:** July 13, 2020, 10:14:04 am »

Hi,
my KKMOON Store version arrived (green tax sticker).
I took some pictures with the shielding dismounted please find attached.
It's "working" (only switched it on).

Noy · « **Reply #54 on:** July 13, 2020, 10:14:34 am »

Second picture (size limitation per post...)

OwO · « **Reply #55 on:** July 13, 2020, 11:01:57 am »

Thanks for the pictures! This one is a well known clone, but I'm still unsure about who actually manufactures it. Do you remember when your order was shipped? Can you check the firmware build time (in CONFIG > VERSION)?

Noy · « **Reply #56 on:** July 13, 2020, 11:54:42 am »

Of course:
Aliexpress says:
Ordered: 25.5.2020 19:46 (German Time)
Shipped: 01.06.2020 18:01 (Tracking info start)

Version shown in picture.

Kean · « **Reply #57 on:** July 13, 2020, 04:21:21 pm »

Quote from: OwO on July 13, 2020, 11:01:57 am

Thanks for the pictures! This one is a well known clone, but I'm still unsure about who actually manufactures it. Do you remember when your order was shipped? Can you check the firmware build time (in CONFIG > VERSION)?

I am just wondering why you say "This one is a well known clone"? What stands out to you that is different?

I compared the photos with my one that I received last week from the recommended Tindie store. Without taking the shields off, the PCB layout and silkscreen, as well as SMD parts, look identical.
The only differences I see are the electrolytic caps - mine is missing C712 near the buttons, and the other is different brand/value. Oh, and the addition of a battery connector on mine.

Mine has almost identical firmware version display except being git-20200607-7980406 built on May 29.

OwO · « **Reply #58 on:** July 13, 2020, 05:00:34 pm »

This clone is known for its 8 extraneous shield clips and 2 electrolytic caps. There are a lot of other subtle differences in the components used. I can usually tell whether a board is a clone with certainty by looking at the PCB bottom side, but I'm still unsure which clone types are made by whom. Once I can get a look at some clones manufactured in June or later I'll get closer to knowing who is responsible for these clones.

Noy · « **Reply #59 on:** July 13, 2020, 05:11:03 pm »

Performance difference would be interesting.
Only passive components can be different.
Are there critical ones for a good performance which should i check (LCR meter)?

Some of the IC markings are a bit "washed out" maybe they started a second life in this clones. 😉😂

I think it was 53,91€ inkl. shipping.
I ordered there because tindie hasn't got Stock.

Kean · « **Reply #60 on:** July 13, 2020, 05:23:45 pm »

Quote from: OwO on July 13, 2020, 05:00:34 pm

This clone is known for its 8 extraneous shield clips and 2 electrolytic caps. There are a lot of other subtle differences in the components used. I can usually tell whether a board is a clone with certainty by looking at the PCB bottom side, but I'm still unsure which clone types are made by whom. Once I can get a look at some clones manufactured in June or later I'll get closer to knowing who is responsible for these clones.

Thanks. Yeah, I had also noticed what looked like extra shield clips.
I guess if they don't have much attention to detail with things like that, then we also can't know what cheap alternative SMD parts they've picked up at the local markets.

OwO · « **Reply #61 on:** July 13, 2020, 05:44:10 pm »

The clones are fine on average since they use the published board designs, but there is a little known detail which is that the directional coupler does not have perfect yield, it is in the range of 80-90% depending on the baluns used. The rest do not pass the directivity test and have to be repaired. If this QC step is not done you can have 10-20% of devices with worse S11 trace noise. If unsure, do a SOL calibration up to 2.7GHz and keep the 50ohm load standard attached, the S11 noise floor should be around -40dB or less.

The SI5351 markings look faded but that could just be due to the double sided reflow process (board is placed on some "paper" on second reflow).

OwO · « **Reply #62 on:** July 13, 2020, 05:53:08 pm »

The yield is something like
80% if using YB006T-1023A
90% if using 617DB-1023=P3 from TOKO
>95% if using CX2156NL from PULSE

The device in the last picture has TOKO baluns, which is what everyone including clones used until all stock is depleted (in May). That balun is no longer in production, but one particular clone manufacture bought a large amount of it. If a clone is still using TOKO baluns in June, that is very good indication of who is behind it. Official devices have now moved to CX2156NL but this is much more expensive (3x price increase).

Kean · « **Reply #63 on:** July 13, 2020, 07:39:09 pm »

Quote from: OwO on July 13, 2020, 05:53:08 pm

Official devices have now moved to CX2156NL but this is much more expensive (3x price increase).

And which is end of life...

Popped the shield on mine and the baluns look very similar to the above photo but with golden instead of red enamelled wire.

And I just cracked the LCD

bicycleguy · « **Reply #64 on:** July 13, 2020, 08:14:22 pm »

Sorry, but now you have an excuse to get the larger display.

Kean · « **Reply #65 on:** July 13, 2020, 08:21:33 pm »

Quote from: bicycleguy on July 13, 2020, 08:14:22 pm

Sorry, but now you have an excuse to get the larger display.

Yep! I've just ordered a couple of the 4" ones linked by Gandalf_Sr above.

Gandalf_Sr · « **Reply #66 on:** July 13, 2020, 10:43:58 pm »

Quote from: Kean on July 13, 2020, 08:21:33 pm

Quote from: bicycleguy on July 13, 2020, 08:14:22 pm
Sorry, but now you have an excuse to get the larger display.
Yep! I've just ordered a couple of the 4" ones linked by Gandalf_Sr above.

Sorry guys, I haven't got round to loading the firmware and trying the new 4" LCD. I have plugged it into my NanoVNA V2 and it will physically work if I design a special case for it.

czorgormez · « **Reply #67 on:** July 13, 2020, 11:10:10 pm »

hi gabriel.
i am planning to buy V2 from bang good. which is the only option for me to avoiding tax problems at customs.
are they selling clones ? do you have idea.

Berni · « **Reply #68 on:** July 14, 2020, 05:20:21 am »

I ordered one on banggood but they only shipped it recently so it will still take some time to get here.

Will post some photos of it when it gets here.

Berni · « **Reply #69 on:** July 14, 2020, 06:21:59 pm »

The one i ordered from banggood just arrived:
https://www.banggood.com/NanoVNA-V2-3G-50KHz-3GHz-Vector-Network-Analyzer-Tester-Antenna-Analyzer-Shortwave-S-A-A-2-Nano-Vna-HF-VHF-UHF-Cable-Tracker-p-1690543.html

Attached are the photos with the shields removed and placed above the PCB. The screenshot is a 1Mhz to 3GHz sweep with Open Short Load calibration showing -43dB up to 2.7GHz. It arrived with a resistive touchscreen pen as the only accessory

OwO · « **Reply #70 on:** July 15, 2020, 03:32:39 am »

That one looks good. It doesn't seem to be a clone (although I can't guarantee they don't mix clones with original units like "Shop5371093 Store" did).

Kean · « **Reply #71 on:** July 15, 2020, 04:05:59 am »

Yes, that looks just like the one I got from the Tindie store with the differences highlighted by OwO/Gabriel.

From the earlier photo of the suspected clone, the TOKO baluns seem to have a slightly different base with small protrusions which don't exist on the Pulse balun. That matches photos of the TOKO part on AliExpress and diagrams in the corresponding datasheets. I took a closer look at the baluns on mine, and the enamelled wires are actually red, they just look golden when viewed from directly above. They don't have the protrusions so I'm pretty sure they are the Pulse balun.

edigi · « **Reply #72 on:** July 15, 2020, 12:05:20 pm »

I've also received my NanoVNA v2 (in the menu shown as version 2.2) and after calibrating it with the received cal kit to 2.5, 3.2 and 4.4 GHz (the max) I've made a quick test with my SMA attenuators (40 and 50dB).
Result pictures attached.

Note to previous posts: If you don't see a C<number> in my understanding it's not calibrated.

I think it's pretty OK till 3GHz.

edigi · « **Reply #73 on:** July 15, 2020, 04:14:33 pm »

I've decided to push the attenuation to the limits of the NanoVNA meaning 60 and 65dB.
With this attenuation the noise shows up quite remarkably in almost all frequencies. Maybe averaging could help...
This is where the older (v1) version of the NanoVNA can still compete. It has less noise in case of low frequencies.

OwO · « **Reply #74 on:** July 15, 2020, 05:41:12 pm »

Latest firmware has some noise improvements at lower frequencies using AGC.


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Author Topic: NanoVNA V2 aka S-A-A-2 (Read 98450 times)

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