Virtual Keyboard

Whenever the NanoVNA-F V3 needs a numeric value — frequency, scale, reference position, velocity factor — the virtual keyboard appears. Understanding its layout and unit keys lets you enter values quickly without counting zeros.

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Keyboard Layout

The keyboard is a 4-by-4 grid with numeric keys, a decimal point, a backspace arrow, and four terminator keys:

	Col 1	Col 2	Col 3	Col 4
Row 1	7	8	9	G
Row 2	4	5	6	M
Row 3	1	2	3	k
Row 4	0	.	Backspace	Ok

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Key Functions

Numeric Keys (0-9) and Decimal Point

Standard digit entry. The decimal point (.) inserts a fractional separator. Only one decimal point is accepted per entry.

Backspace

Deletes the last character from the input field. When the input field is empty, pressing backspace closes the keyboard and cancels the entry.

Unit / Terminator Keys

These keys serve a dual purpose: they multiply the entered value by a unit factor and immediately submit the result. You do not need to press Ok after a unit key.

Key	Multiplier	Typical Use
G	x 1,000,000,000	GHz (gigahertz)
M	x 1,000,000	MHz (megahertz)
k	x 1,000	kHz (kilohertz)
Ok	x 1	Enter value as-is (Hz, dB, %, etc.)

Note

The unit keys are context-aware in label only — mathematically they always apply the same multiplier. When entering a non-frequency value (scale, reference position, velocity factor), Ok is the appropriate terminator since no unit conversion is needed.

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Entry Examples

Frequency Entry

Target Frequency	Keystrokes	What Happens
100 kHz	1 0 0 k	100 x 1,000 = 100,000 Hz
433.92 MHz	4 3 3 . 9 2 M	433.92 x 1,000,000 = 433,920,000 Hz
2.4 GHz	2 . 4 G	2.4 x 1,000,000,000 = 2,400,000,000 Hz
1 MHz	1 M	1 x 1,000,000 = 1,000,000 Hz
50 MHz (long form)	5 0 0 0 0 0 0 0 Ok	50,000,000 Hz entered directly

Non-Frequency Entry

Target Value	Context	Keystrokes
Scale 15 dB/div	DISPLAY > SCALE	1 5 Ok
Ref pos 5	DISPLAY > REF POS	5 Ok
Velocity factor 70%	TDR > VELOCITY FACTOR	7 0 Ok
E-delay -0.1 ns	CONFIG > E-DELAY	- 0 . 1 Ok

Tip

Use the unit keys to save time. Entering 433.92M is much faster and less error-prone than typing out 433920000 followed by Ok.

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Tips

• Leading zeros are optional. Entering .5G is equivalent to 0.5G and sets 500 MHz.
• Cancel entry by pressing backspace until the input field is empty, then pressing backspace once more.
• The keyboard closes automatically after any terminator key (G, M, k, Ok) is pressed.
• Negative values are supported for some parameters (e.g., electrical delay). A minus sign (-) may appear as a separate key when the context requires it.
• No confirmation dialog — the value is applied immediately when you press a terminator key. Double-check the display after entry.