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Looking for an approved vendor Aliexpress (Zeenko Store) without success.
Where to buy a NanoVNA H4 HW rev 4.3?
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73 de dl1ecd, Erik

On Sat, Dec 4, 2021 at 02:02 PM, Hugen wrote:

You can buy NanoVNA-H4 from the zeenko store. NanoVNA-H4 is now sold by

zeenko

in version rev4.3.

It should be noted that the MCU used in the NanoVNA-H4 rev4.3 is the
STM32F302CBT6. We have tested that the STM32F302CBT6 has the same RAM

and ROM

as the STM32F302CCT6.
Since no additional STM32F303 functions are used on the NanoVNA-H4, the
STM32F302 and STM303 use on the NanoVNA-H4 are identical.

The STM32F302CBT6 has 128KB Flash and 32KB Ram and the STM32F302CCT6 has
256KB Flash and 40Kb Ram.
I was about to buy a Nanovna-H4 as I want another Nanovna with a bigger
screen than my Nanovna-H 3.4, I will keep my Nanovna-H for portable/sota
use.
But it is really confusing which model to buy, especially as there seems
to be different STM32F30* MCU's used in the H4.

On Thu, Dec 30, 2021 at 08:05 PM, Dragan Milivojevic wrote:

Unless you are planning to do a custom firmware what difference does it
make to you?
Anyway, microcontrollers have "paper" specifications and real ones:
STM32F103C8 as
a common example.

It's one thing substituting a 303 with a 302 (Fine if the additional
features of the 303 are never used or will never be used in the future) But
substituting it for the B variant that has half the flash and less ram is
something else!
The H4 architecture does require more than 128KB flash, hence the
additional features over the H2.8 such as 401 points.
Not all B variants will actually have more FLASH/RAM and even if the die
contains it there is no guarantee that they will be fully functional and
why they are binned as B variants.
Not to mention any future development could be possibly questionable for
HW4.3 version of the H-4, it could limit the development of all H-4 devices
to keep absolute compatibility or exclude devices using the lesser MCU's.

On Fri, Dec 31, 2021 at 07:22 PM, Dragan Milivojevic wrote:

the
manufacturer guaraties the specs, what is inside is of no concern to the
end user.

Your name is not familiar to me, who are you in relation to this product?
Of course it is of concern to the end user and could you direct me to
where the manufacturer guarantees these specifications?
Other than one post on here stating the MCU has been downgraded to a
different series and then to a version with less ram/flash.
This is not mentioned on any of the product pages nor any technical
documentation.

On Fri, Dec 31, 2021 at 09:11 PM, Dragan Milivojevic wrote:

User.
Hugen is the manufacturer.
For specs the best place is the firmware change logs,
quite a few things have improved since Dislord started to do firmware.
If you are concerned about parts used outside of specified range, I have
news for you, the clock generator and the mixer are used way out of

specs.

That is not news, everyone is aware that the si5351 LO is a 200MHz part,
this has been known from day 1 and has been documented everywhere.
Running components at a faster speed than designed for is completely
different to substituting a part for with less Flash/Ram. And may I mention
has not been documented anywhere. In fact there was some earlier confusion
on this group in another topic where people were lead to believe they had
received a clone H4 due to it having a STM32F302CBT6! When in fact this
could have well been genuine.

On Sun, Jan 2, 2022 at 03:47 PM, Dragan Milivojevic wrote:

You are right, it is completely different. One is running a part
out of spec, betting on manufacturing tolerances, the other
is relying on the fact that manufacturers relabel chips.
As for clones etc, those that buy at authorised resellers
have no such dilema.

I just received another NanoVNA for the collection, a NanoVNA-H4 Genuine,
V4.3.
And this one came with a STM32F302CBT6, 32Khz clock xtal and also SD Card
slot with cutout.
I'm curious to check this MCU over, I have a genuine ST-Link V2 also Keil
development boards for this series of MCU and some STM discovery boards (I
can easily remove this MCU and solder it there)
I have loaded the latest Hugen/Dislord firmwares and it's working okay, I
hope it stays this way in the future.

On Mon, Jan 10, 2022 at 03:28 PM, Dragan Milivojevic wrote:

I'm sure it will.
If you are able to, please post the images of the board.
Thinking about getting one just to see if the changes around
voltage regulators on the 4.3 version are significant compared
to the previous one.

Yes no problem at all I will get some pictures, this is the V4.3 with SI5351, There is another version which is has a MS5351M which is V4.3-MS, but I do not know if that one has other changes.