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
