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Is this a clone that I should not buy?


pthyrrestrup 2021/04/14 07:07

I found this on Banggood.com:

https://www.banggood.com/S-A-A-2-NanoVNA-V2-50kHz-3GHz-3_2-Inch-Large-Screen-3G-Vector-Network-Analyzer-S-A-A-2-NanoVNA-V2-Antenna-Analyzer-Shortwave-HF-VHF-UHF-Measure-Duplexer-Filte-p-1707650.html?cur_warehouse=CN&rmmds=search

Is it advisably thatr I buy this or should I choose anotyer one?
Best regards
Per

Siegfried Jackstien 2021/04/14 14:30

that is the one with small screen (and on longer use you get eye cancer
hi hi)

get one with 4 inch screen... if you want to stay cheap then the saa2n
... if you want the betterunit then take the v2plus4

for around 65 to 70 bucks you will find the saa2n ... (same price as
your bangood unit you found but a bigger screen) and the v2plus4 does
not cost that much more

greetz sigi dg9bfc


Am 14.04.2021 um 14:07 schrieb pthyrrestrup@gmail.com:

VNA2 2021/04/14 08:39

That is the unit I purchased.  Although from ebay for a higher price.  I tested it out very much then updated the firmware.  I am very pleased with it.  It is not the 4 inch screen but was on the recommended clone list ( https://nanorfe.com/nanovna-versions.html ).   I can run it on my old laptop if I want a larger screen.  It worked well with my linux system.  I am a retired technician.  Worked on transmitters since I obtained my commercial FCC license when 19.  Worked all from 30kHz to 8gHz.  Army, Air Force, FAA.  Radio, teletype, microwave, RADAR.

pthyrrestrup 2021/04/14 09:08

Thank you Siegfried,
Where can I buy the v2plus?

David J Taylor 2021/04/14 17:42

On 14/04/2021 17:08, pthyrrestrup@gmail.com wrote:
> Thank you Siegfried,
> Where can I buy the v2plus?

Try:
https://www.tindie.com/products/hcxqsgroup/4-nanovna-v2-plus4/?pt=ac_prod_search

Cheers,
David
--
SatSignal Software - Quality software for you
Web: https://www.satsignal.eu
Email: david-taylor@blueyonder.co.uk
Twitter: @gm8arv

Siegfried Jackstien 2021/04/14 16:46

i modded my saa2n to a "plus"

three steps

a hardware modding (change 3 smd parts to change bandwidth on the if
part of the analyzer)

a new bootloadewr (that is a bit tricky to solve)

and then (AND ONLY THEN) upload a "plus" firmware

only if you make ALL THREE steps it is converted to a plus version

only change fw or change fw and change smd parts is not enough ... YOU
NEED THAT SPECIAL BOOTLOADER ALSO!!

getting a bootloader?? ask here or in "discord" (user discussion group)
for a bl FOR YOUR SERIAL NUMBER

yes all plus versions have its own bootloader with the serial number
inside ;-)

uploading can be done with an st link dongle , stm discovery board ...
or similar

no no it does not work via usb ... bootloader upgrade only works on the
programming port inside the unit

.... all too complicated?!? ... then buy a v2plus4

https://www.tindie.com/products/hcxqsgroup/4-nanovna-v2-plus4/

greetz sigi dg9bfc

Am 14.04.2021 um 16:08 schrieb pthyrrestrup@gmail.com:

OwO 2021/04/15 01:06

There is no serial number in the bootloader (try searching for it in a
hex editor, you won't find it), but there is a factory calibration that
all plus/plus4 versions rely on. If uploading firmware using NanoVNA-QT
you don't need to worry about it as there's no way to overwrite the
bootloader or factory calibration this way, but if using ST-LINK you
should back up the flash memory first, and if you do lose your factory
calibration you can ask me to look up the flash image data given a
serial number.

Siegfried Jackstien 2021/04/14 17:42

ok ... serial number is for the factory settings .. thanks for making it
a bit clear now

aehm ... i did not backup the internal when upgrading from the v2 to
v2plus (saa2nplus) ... how did you get the settings for my unit?? (i
asked for that bl in dicord as you sure remember) ... was i just lucky
that all went right?!?

or is there are base setting that is flashed on all units (cause when
measure you need to calibrate it anyway)??

can one do a calibration and save that as new factory setting?? (to
include parts spreading and in case of the saa2n include the sma to n
adaptor) ??

greetz sigi dg9bfc

Am 14.04.2021 um 17:06 schrieb OwO:

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