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New H4 owner. Does the mini SD card have to be formatted before use?
73 Paul W2ECK

Yes, FAT32.
But most all cards come pre-formatted that way.
And must be 32GB or less - I use some inexpensive Patriot 16GB cards from Amazon.
Some cards may not work, since they need to support the little-used spi mode, so if your card doesn't work, try a different model.

Stan
thanks for the info
73

Another question
With the screen facing up - does the card go in with the card label facing up?
when I tried to insert the card there is a space where the card could slip into the case and not be seated - just want to make sure doing correctly

Paul

On Mon, Aug 19, 2024 at 07:57 PM, w2eck wrote:

Another question
With the screen facing up - does the card go in with the card label facing up?
when I tried to insert the card there is a space where the card could slip
into the case and not be seated - just want to make sure doing correctly

Paul

No it's the other way round. If you look at the slot you will see the circuit board and the SD card contacts face that. If you miss the socket the card will fall inside the case then you have to open it up to retrieve it.

--
Mike

Mike
Thanks for the help, got it in.

73 Paul

I recently bought an H4 v4.3. Was looking forward to being able to save plots from the nanoVNA to a micro SD card. But every attempt resulted in "fail write" message. I read that it cannot handle some big fast modern cards. Tried an 8GB card. No Go. Tried an old 1GB card, formatted FAT32. The nanoVNA managed to save a calibration, but screenshots "fail". Each failed screenshot save resulted (as seen from Windows) in a file written by the chosen name - but with zero size. Tried a brand new 2GB card, no go. Read somewhere advice to format the card using the official SD-formatter program from the SD conglomerate. I have a very old version of that on my Windows XP PC. Tried that. It formatted it FAT (not FAT32). The nanoVNA accepted that and successfully wrote a BMP screenshot file. That's been my experience. YMMV.
- Moshe N1OVN

I am using a 32GB micro SD card in my NanoVNA-H v3.6. I use it mainly to
save calibration (). I did not do any
formatting, just inserted a new card and started saving calibration. So far
I have saved about 7 sets and recalled them multiple times later.

After reading your post, I tried to save a screenshot. It showed as saved.
But when I tried to recall it, the recalled screen is just a grey screen
with only the saved number (8.bmp) at one corner!

Jon, VU2JO

On Thu, Mar 6, 2025 at 4:36?PM moshe.braner via groups.io <moshe.braner=
[email protected]> wrote:

I recently bought an H4 v4.3. Was looking forward to being able to save
plots from the nanoVNA to a micro SD card. But every attempt resulted in
"fail write" message. I read that it cannot handle some big fast modern
cards. Tried an 8GB card. No Go. Tried an old 1GB card, formatted
FAT32. The nanoVNA managed to save a calibration, but screenshots "fail".
Each failed screenshot save resulted (as seen from Windows) in a file
written by the chosen name - but with zero size. Tried a brand new 2GB
card, no go. Read somewhere advice to format the card using the official
SD-formatter program from the SD conglomerate. I have a very old version
of that on my Windows XP PC. Tried that. It formatted it FAT (not
FAT32). The nanoVNA accepted that and successfully wrote a BMP screenshot
file. That's been my experience. YMMV.
- Moshe N1OVN

Addendum: After posting the last message, I reviewed the video link which I
had posted regarding saving of stimulus frequency range. Then I saw that on
recall, I have to press on the number displayed in the corner of the grey
screen, which I had done unknowingly, to get the frequency range displayed.

Went back and did the same thing for the screenshot - Clicked on 8.bmp with
the guitar pick which came along with the NanoVNA. To my pleasant surprise,
the grey screen disappeared and the saved screenshot was displayed!

Jon, VU2JO.

On Thu, Mar 6, 2025 at 5:23?PM Jon via groups.io <vu2jo0@...>
wrote:

I am using a 32GB micro SD card in my NanoVNA-H v3.6. I use it mainly to
save calibration (). I did not do any
formatting, just inserted a new card and started saving calibration. So far
I have saved about 7 sets and recalled them multiple times later.

After reading your post, I tried to save a screenshot. It showed as saved.
But when I tried to recall it, the recalled screen is just a grey screen
with only the saved number (8.bmp) at one corner!

Jon, VU2JO

On Thu, Mar 6, 2025 at 4:36?PM moshe.braner via groups.io <moshe.braner=
[email protected]> wrote:

I recently bought an H4 v4.3. Was looking forward to being able to save
plots from the nanoVNA to a micro SD card. But every attempt resulted in
"fail write" message. I read that it cannot handle some big fast modern
cards. Tried an 8GB card. No Go. Tried an old 1GB card, formatted
FAT32. The nanoVNA managed to save a calibration, but screenshots

"fail".

Each failed screenshot save resulted (as seen from Windows) in a file
written by the chosen name - but with zero size. Tried a brand new 2GB
card, no go. Read somewhere advice to format the card using the official
SD-formatter program from the SD conglomerate. I have a very old version
of that on my Windows XP PC. Tried that. It formatted it FAT (not
FAT32). The nanoVNA accepted that and successfully wrote a BMP

screenshot

file. That's been my experience. YMMV.
- Moshe N1OVN