Link Series — Complete Digital System

ZYRO C403 Max

VTX Wireless Transmitter + RBox Ground Receiver System

The ZYRO C403 Max is a complete digital wireless video transmission system comprising a VTX airborne transmitter and an RBox ground receiver. Operating across the wide 3–7 GHz band with 1080p60fps video, OSD Canvas mode support for Betaflight and INAV, and wireless pairing, it delivers a fully integrated digital video link from airborne camera to ground display.

Wide-Band 3–7 GHz

5 MHz communication bandwidth across 3–7 GHz for 36 selectable channels and flexible frequency planning.

1080p60 / 720p60 Video

High-definition digital video output at 1080p60fps or 720p60fps for smooth, professional-quality footage.

Dual Camera Support

VTX supports both visible-light (MIPI 2-lane / 4-lane) and infrared (MIPI 1-lane / DVP) camera inputs.

OSD Canvas Mode

Supports Betaflight and INAV MSP OSD Canvas mode for real-time telemetry overlay on the video feed.

Quick Pairing

Simple one-button pairing process — green LEDs on both VTX and RBox confirm active link establishment.

TF Card Recording

Both VTX and RBox support TF cards up to 1 TB for local video recording alongside wireless transmission.

3–7 GHz 1080p60fps OSD Canvas Betaflight / INAV 36 Channels 22.41g VTX 1TB SD Card

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Technical Data

VTX Specifications

Parameter	Value
Model	C403 Max
Communication frequency	3–7 GHz
Communication bandwidth	5 MHz
Transmit power (EIRP)	MAX: 33 dBm; FCC: <30 dBm; CE: <14 dBm; SRRC: <20 dBm; MIC: <25 dBm
Interfaces	JST1.0 × 4 (power cable), TF card slot
Mounting hole spacing	25.5 mm × 25.5 mm
Dimensions	34 mm × 34 mm × 18 mm
SD card slot	Supports up to 1 TB
Video resolution	1080p60fps / 720p60fps
Weight	22.41 g
Operating temperature	-20 to 60 °C
Number of channels	36
Power input	11.1–40 V
Supported FC systems	Betaflight, INAV
OSD	Canvas Mode (MSP OSD output)
Antenna	4 IPEX connectors; 3–5 GHz and 5–7 GHz coverage

RBox Specifications

Parameter	Value
Communication frequency	3–7 GHz
Communication bandwidth	5 MHz
SD card slot	Supports up to 1 TB
Type-C interfaces	USB-A to Type-C (PC upgrade); USB 3.2 Type-C to Type-C (DP display); UART EXP (TTL 3.3 V serial)
Power input	9–30 V, 2 A
Fan interface	5 V / 200 mA supply capability
Keypad interface	Dedicated keypad board; custom keypad development supported

Camera & Antenna Specifications

Parameter	Value
Image sensor	1/1.8 inch, 2 MP
Resolution	1080p60fps / 720p60fps
Aspect ratio	16:9 / 4:3
FOV	160°
Aperture	F2.2
Shutter	Rolling shutter
Weight	13.47 g
Camera dimensions	19 mm × 19 mm × 24 mm
Minimum illumination	0.0001 Lux
Coaxial cable length	140 mm
VTX antenna	LHCP, 3–5 GHz / 5–7 GHz, avg gain 2 dBi, 50 Ω, VSWR < 1.5, IPEX-1
RBox antenna	LHCP, 3–5 GHz / 5–7 GHz, avg gain 10 dBi, 50 Ω, VSWR ≤ 2.5, SMA-J

Interface Reference

VTX Interface Description

Interface	Description
Power interface ①	VIN: 8–40 V; GND; RX2/TX2 for flight controller serial at 3.3 V level
Visible camera ②	MIPI 2-lane or 4-lane signals
Debug interface ③	Factory debug sub-board only — RX0, TX0, VBUS, GND, DP, DM
Infrared camera ④	MIPI 1-lane or DVP signals
Pairing button ⑤	Press to initiate pairing between VTX and RBox

LED Status Indicators

Status Indicators

Status	LED Indication
Unpaired state	Red LEDs on VTX and RBox remain on
Pairing in progress	Dual-color LEDs on VTX and RBox flash rapidly
Pairing successful	Green LEDs on VTX and RBox remain on (link active)

Applications

Typical Application Scenarios

FPV drone video links with Betaflight or INAV OSD

Dual-camera platforms requiring both visual and infrared video

Long-range digital video transmission for fixed-wing aircraft

Professional UAV operations requiring high-definition video

Ground control station setups with display via DP output

Research platforms needing simultaneous video recording and transmission