nanoVNA Web

Start

MHz

Stop

MHz

Points

Model maximum (201) Quick, for continuous (101) Custom

Last sweep: —
Device range: —
Device sweep: —

cal: unknown

Calibration lives on the device; the page only sends the commands. Run a sweep from the page first so the device is on the range you'll measure with, then step through the standards. The device keeps sweeping during calibration (it has to).

Slot

F V2 accepts save 0–4; recall 0–6.

Electrical delay (edelay)

Port extension for a cable between the port and the DUT. Passed straight to the device.

While recording, every sweep (single or continuous) and every CW reading is kept with a timestamp. Works in any view.

Sweeps: 0
CW readings: 0
Size: 0 kB

Save

The waterfall CSV matches the plot: timestamps down, frequencies across. The sweep log is the long format for pandas.

CSV has derived columns (dB, phase, SWR, R, X). Touchstone is real/imaginary in Hz with the current Z₀.

Session

Sweep, held trace, overlay, markers and settings as one JSON file.

Compare

No overlay loaded. A loaded file is drawn dotted under the live trace; toggle it in Settings.

Records the raw replies to a fixed set of commands, with timings, into a file to attach to a bug report. Changes nothing on the device.

These run on the device's own screen.

Theme

Dark Light

Trace colours

Instrument (S11 yellow, S21 cyan) Blue / amber

Waterfall palette

Waterfall colour floor

Reference impedance Z₀

Used for SWR, the Smith chart, R + jX, and the Touchstone header.

Beep (device buzzer)

After every sweep When minimum SWR drops below Also play a tone in the browser

The SWR beep fires once each time the threshold is crossed, so you can trim an antenna by ear.

Device screen brightness

Sent as pwm on change and on connect.

Device mirroring

Set device trace 0 to match the page view

Compare

Draw the loaded overlay

Debugging Echo raw received chunks in the console

Markers

Click the plot to place one (up to 6).

#	Frequency	\|S11\| dB	SWR	R Ω	X Ω	\|S21\| dB	Phase °

No markers yet.

Device console

Log