File Browser

The NanoVNA-H includes an SD card file browser for managing saved data, calibrations, and screenshots directly on the device.

Access File Browser

1. Ensure an SD card is inserted
2. Tap the screen to open the menu
3. Navigate to SD CARD
4. Tap BROWSE or FILE LIST

The screen displays files on the SD card.

File Display

The browser shows:

• Filename
• File size
• File type indicator (based on extension)

Files are displayed in directory order, typically alphabetically or by creation time.

Supported File Types

Extension	Type	Purpose
.S1P	S-parameter	One-port Touchstone data
.S2P	S-parameter	Two-port Touchstone data
.BMP	Image	Screenshot bitmap
.TIF	Image	Screenshot (compressed)
.CAL	Calibration	Saved calibration data
.INI	Config	Configuration script

File Operations

View File Info

1. Navigate to a file in the browser
2. Tap the file to select it
3. View file size and type

Delete Files

1. Select the file to delete
2. Use the DELETE option
3. Confirm deletion if prompted

Caution

Deleted files cannot be recovered. Be certain before deleting.

Recall Calibration

1. Navigate to a calibration file
2. Select the file
3. Tap LOAD or RECALL
4. Calibration is applied

Shell Commands for File Management

# List all files
sd_list

# List files matching pattern
sd_list *.S1P
sd_list *.BMP
sd_list DATA*.*

# Read file contents (outputs raw data)
sd_read filename.ext

# Delete a file
sd_delete filename.ext

Practical Examples

Clean Up Screenshots

1. Open file browser
2. Navigate to BMP files
3. Review each screenshot
4. Delete unwanted captures
5. Transfer keepers to computer

Manage Calibrations

1. List calibration files
2. Identify outdated or unused calibrations
3. Delete old calibrations to free space
4. Keep organized by naming convention

Find Specific Data

# Find all S-parameter files
sd_list *.S?P

# Find files from today (if date in name)
sd_list *0129*.*

SD Card Requirements

• Format: FAT32 (recommended) or FAT16
• Card capacity: Up to 32 GB
• Insert card before powering on

Tip

Format new SD cards on a computer before first use. Some cards formatted by cameras or phones may not work properly.

File Organization

All files are stored in the root directory:

/
├── DATA0001.S1P
├── DATA0002.S2P
├── CAPTURE001.BMP
├── CAPTURE002.BMP
├── config.ini
└── ...

Note

The firmware does not support subdirectories. All files must be in the root folder.

Limitations

• Maximum files in root directory depends on SD card
• Very long filenames may be truncated
• No subdirectory support
• No file rename on device
• No file copy on device

Transfer Files to Computer

Method 1: Remove SD Card

1. Power off NanoVNA-H
2. Remove SD card
3. Insert in computer’s card reader
4. Copy files using file manager
5. Return SD card to NanoVNA-H

Method 2: Serial Transfer

# List files
sd_list

# Read file (outputs binary to terminal)
sd_read CAPTURE001.BMP

Caution

Serial file transfer sends raw binary data. Use terminal software that can capture binary output to a file.

Troubleshooting

Card Not Detected

• Ensure card is properly inserted
• Try reinserting the card
• Power cycle the device
• Test card in computer to verify it works
• Try a different SD card

Files Not Showing

• Check file is in root directory
• Verify filename and extension
• Use sd_list to see all files
• Check file isn’t hidden or system file

Write Errors

• Check card isn’t write-protected
• Ensure adequate free space
• Try a different SD card
• Card may be corrupted - format and retry