Figured this could use its own thread.
Please provide links where possible. I have had some instances where SD cards that /looked/ like they were what I wanted, turned out not to be compatible.
1.6 SD CARD
SNP files and screen images are saved with names VNA_yymmdd_hhmmss, and extensions of s1p, s2p, or bmp. Although it seems that the SD cards can be hot-swapped, the NanoVNA beta group recommends powering off to install or remove SD cards. The NanoVNA SD card reader is connected to the SPI bus, and only supports microSD cards up to 32GB in SPI mode. Some high-speed SD cards may not support SPI mode. The SPI mode is an alternative operating mode that is defined to use the MMC/SD cards on microcontrollers without a native host interface. The MMC/SD can be used on a microcontroller via a generic SPI interface. See STMicroelectronics AN5595 "SPC58xEx/SPC58xGx multimedia card via SPI interface".
~R~
72/73 de Rich NE1EE
The Dusty Key
On the banks of the Piscataqua
Rich NE1EE