Robofusion VT5804 5.8GHz 2.5W FPV Video Transmitter Module — 48CH Analog VTX, TBS SmartAudio, 25–2500mW, 30.5×30.5 Stack Mount

Overview

The Robofusion VT5804 is a 5.8GHz analog video transmitter (VTX) module for long-range and freestyle FPV. It delivers up to 2.5W (2500mW) across four switchable power levels, covers 48 channels on 6 bands (including Raceband), and accepts a wide 7–36V input that runs directly from 2S–8S packs — no external BEC required. The 30.5×30.5mm bolt pattern drops straight onto standard full-size flight-controller stacks, and band, channel, and power are tunable from your Betaflight/iNav OSD over TBS SmartAudio or with the onboard button.

Features

• 4 power levels — 25 / 600 / 1200 / 2500mW: bench-safe 25mW for setup, 2.5W for extreme long-range
• 48 channels, 6 bands (A / B / E / FS-IRC / RACE / LOW) — compatible with every standard analog 5.8GHz receiver and goggles
• TBS SmartAudio — change band, channel, and power from your flight controller OSD or radio (Betaflight, iNav, ArduPilot)
• Wide 7–36V input — runs directly from 2S–8S; regulated 5V output powers your FPV camera
• Aluminum heatsink chassis — integrated cooling fins maintain output stability at 1.2W and 2.5W
• Low-profile 7.2mm, only 11g — the lightweight option in the series (the fan-cooled 4W VT5805 is the max-range option)
• Standard 30.5×30.5mm mounting, MMCX antenna connector with RP-SMA extension included

Specifications

Getting Started

Wiring takes minutes with the single 6-pin connector: battery or PDB to VIN/GND, camera video to VIDEO, camera power from the regulated 5V VOUT, and (optionally) a flight-controller UART TX to RX_OSD for SmartAudio control. Full pinout and diagram: VT5804 Wiring Guide.

⚠ Never power on without an antenna attached — reflected RF energy can permanently damage the output stage within seconds.

Configuration

Set channel, band, and power with the onboard button and LED indicators — see the button configuration guide and 48-channel frequency table. Or wire SmartAudio and control it from Betaflight, iNav, or ArduPilot: SmartAudio setup.

Documentation & Guides

• VT5804 User Manual — full specifications, wiring, frequency table, LED reference, FAQ
• Transmit power & licensing — operation above 25mW generally requires an amateur (HAM) radio license in the US/Canada
• VT5805 4W User Manual — the higher-power sibling, if you need maximum range

Who Is This For?

• Long-range pilots pushing analog video links to multi-kilometer distances where 1W is no longer enough
• Freestyle builders flying in obstacle-dense environments where RF penetration matters
• 6S and 8S build owners — the 7–36V input means no extra step-down regulator
• Repair or upgrade swaps — the 30.5×30.5mm bolt pattern fits directly onto most full-size FC stacks

Package List

• 1 × Robofusion VT5804 video transmitter module
• 1 × MMCX-to-RP-SMA extension feeder cable (87mm)
• 2 × Flight controller signal/power cables (100mm each)

Note: antenna not included. The VTX must never be powered on without a 5.8GHz antenna connected to the MMCX port — running a high-power VTX without an antenna will permanently damage the output stage. Please source a compatible antenna before first use.

Frequently Asked Questions

Q: Does this VTX work with Betaflight OSD power control?
A: Yes. It speaks TBS SmartAudio over a single UART TX pad. Once enabled in Betaflight or iNav, you can switch band, channel, and power from the OSD without landing.

Q: Can I power it directly from a 6S or 8S battery?
A: Yes — 7–36V covers 2S (≈7.4V) through 8S (≈33.6V fully charged) directly. For 8S HV packs that may exceed 36V at full charge, use a standard 8S pack or add a step-down regulator.

Q: Will it fit a standard FC stack?
A: Yes — the 30.5×30.5mm pattern matches common full-size FC/ESC stacks. It does not natively fit 20×20mm micro stacks.

Q: Is the LOW band legal in my country?
A: The LOW band (5362–5621MHz) overlaps frequencies not authorized for unlicensed operation in many regions, including the US (FCC) and Canada (ISED). Compliance is the operator's responsibility — North American pilots typically operate on Raceband, FS/IRC, or specific A/B/E channels.

Q: Does it have a built-in microphone?
A: No — the VT5804 transmits CVBS video only. For audio, use an FPV camera with an integrated microphone.

Q: Does it support IRC Tramp?
A: No — TBS SmartAudio only, which is natively supported by all current Betaflight and iNav firmware.

Compliance & Legal

5.8GHz transmitters operating above 25mW require an amateur radio license or equivalent authorization in many jurisdictions, including the United States (FCC) and Canada (ISED). Operators are responsible for ensuring frequency, power, and operating conditions comply with all applicable local regulations. This product is sold for radio-controlled hobby, professional drone development, and other lawful applications.

Technical Support

Questions before or after purchase? Email support@robofusion.net — answered by the Robofusion engineering team.