Hardware Revisions

This page documents the hardware revision history for NanoVNA-H and NanoVNA-H4 devices. Different revisions may have component variations that affect firmware behavior.

NanoVNA-H Revisions

Revision 3.7 (Current)

Released to support ZeeTK NE602A mixer compatibility.

Key Changes:

Schematic modifications for ZeeTK NE602A mixer support
Uses SJWCH5351 (formerly SMC5351) as signal source
Operates down to 600 Hz minimum frequency
Improved port isolation below 300 MHz

Firmware Requirements:

Enable __ZEETK__ define in nanovna.h
Harmonic threshold set to 300.000110 MHz

Revision 3.6.1

Key Changes:

Added support for SMC5351 frequency synthesizer
Uses same parameters as MS5351 but with lower power consumption
Better port isolation characteristics

Revision 3.6

Key Changes:

Added ST7789 display controller support (auto-detected)
Maintained ILI9341 compatibility

Revision 3.5

Key Changes:

Improved power management
Enhanced audio codec configuration

Revision 3.4

Key Changes:

Initial widely-available NanoVNA-H hardware
Based on original NanoVNA design with STM32F072

NanoVNA-H4 Revisions

Revision 4.4 (Current)

Released alongside NanoVNA-H rev 3.7 for ZeeTK compatibility.

Key Changes:

Modified schematic for ZeeTK NE602A mixer IC
SJWCH5351 signal source support
Maximum 401 sweep points
4.0” ST7796S display (480x320)

Firmware Requirements:

Build with TARGET=F303
Enable __ZEETK__ define
Uses ARM Cortex-M4 DSP instructions

Revision 4.3

Key Changes:

Initial NanoVNA-H4 hardware release
STM32F303CCT6 MCU
Hardware floating-point support

Component Variants by Revision

Mixer IC

Revision	Mixer IC	Min Frequency
3.4-3.6	NXP SA612A	1.6 kHz
3.7+	ZeeTK NE602A	600 Hz
4.3	NXP SA612A	1.6 kHz
4.4+	ZeeTK NE602A	600 Hz

Frequency Synthesizer

Variant	Revisions	Notes
Si5351A	Early 3.x	Original Silicon Labs part
MS5351M	3.5+	Drop-in compatible
SMC5351	3.6.1+	Lower power, renamed to SJWCH5351
SJWCH5351	3.7+	Current production

Display Controller

Controller	Display Size	Revisions
ILI9341	2.8” 320x240	3.4-3.7 (H)
ST7789	2.8” 320x240	3.6+ (H)
ST7796S	4.0” 480x320	4.3+ (H4)

The firmware auto-detects ILI9341 vs ST7789 at boot.

Identifying Your Revision

From Firmware

Use the info or version shell command:

ch> version
NanoVNA-H
2019-2024 Copyright @DiSlord
Licensed under GPL.
Version: 1.2.44
Build Time: Jan 29 2026
Kernel: 5.1.0
Compiler: GCC 8.3.1
Architecture: ARMv6-M
Port Info: Preemption through NMI
Platform: STM32F072xB
Board: NanoVNA-H

From PCB

Look for revision marking near the edge of the PCB, typically labeled:

NanoVNA-H v3.x
NanoVNA-H4 v4.x

Firmware Compatibility

Firmware Define	3.4-3.6	3.7	4.3	4.4
`__ZEETK__`	No	Yes	No	Yes
`NANOVNA_F303`	No	No	Yes	Yes
`LCD_DRIVER_ST7796S`	No	No	Yes	Yes
`ARM_MATH_CM4`	No	No	Yes	Yes

Migration Notes

Upgrading 3.6 to 3.7 Hardware

If your NanoVNA-H was manufactured with SA612A mixer and you’re having issues:

Verify mixer IC markings
Check FREQUENCY_MIN in info output
If 1600 Hz: SA612A firmware required
If 600 Hz: ZeeTK firmware required

Building for Specific Revisions

For SA612A hardware, comment out __ZEETK__ in nanovna.h:

// #define __ZEETK__  // Comment out for SA612A hardware

This sets:

FREQUENCY_MIN to 1600 Hz
FREQUENCY_THRESHOLD to 290.000110 MHz

Schematic Differences

Rev 3.7 vs 3.6 (Mixer Section)

The harmonic rejection filter component values differ between SA612A and NE602A variants due to different internal mixer characteristics.

Rev 4.4 vs 4.3 (Display Section)

The H4 4.4 revision includes refined DAC-based backlight control with improved linearity.

Source Code Reference

Revision-specific defines are located in:

Mixer selection: nanovna.h lines 24-25
Frequency limits: nanovna.h lines 177-191
Board identification: NANOVNA_STM32_F072/board.h line 24
Board identification: NANOVNA_STM32_F303/board.h line 28