Robofusion VT5804 5.8GHz 2.5W Long-Range Analog FPV Video Transmitter — 48CH, 6 Bands, 2S–8S (7–36V), TBS SmartAudio, 30.5×30.5mm Stack Mount, MMCX

Overview

The Robofusion VT5804 is a 5.8 GHz analog video transmitter designed for long-range FPV and freestyle quadcopters. It delivers up to 2.5 W (2500 mW) of RF output across four switchable power levels, gives you 48 channels across six bands, and accepts a wide 7–36 V input that runs directly from 2S through 8S LiPo packs — no external BEC required.

The 30.5 × 30.5 mm bolt pattern drops straight onto standard full-size flight controller and ESC stacks used in 5", 7", and larger long-range airframes. Tune band, channel, and power from your Betaflight or INAV OSD over TBS SmartAudio, or use the onboard button for in-field adjustment.

Key Features

• 2500 mW maximum output — four switchable power levels (25 / 600 / 1200 / 2500 mW) span bench testing to extreme long-range
• Wide 7–36 V input voltage — runs directly from 2S to 8S LiPo with no external regulator
• 48 channels across 6 bands — A / B / E / FS-IRC / Raceband / LOW Band, including extended low frequencies for additional channel separation
• TBS SmartAudio protocol — adjust band, channel, and power from your OSD without removing the model
• 5 V BEC output — clean regulated power for your FPV camera
• Aluminum heat-sink chassis — integrated cooling fins help maintain output stability at 1.2 W and 2.5 W
• 30.5 × 30.5 mm mounting holes — direct fit to mainstream full-size FC / ESC stacks
• MMCX antenna connector — MMCX-to-RP-SMA extension pigtail included

Complete Specifications

• Model: VT5804
• Brand: Robofusion
• Frequency Band: 5.8 GHz
• Channels: 48  (6 bands × 8 channels)
• Bands: A / B / E / FS-IRC / Raceband / LOW
• Output Power: 25 / 600 / 1200 / 2500 mW, 4 levels switchable
• Input Voltage: 7–36 V DC  (2S–8S LiPo)
• Max Current: 850 mA @ 12 V
• Output Voltage (BEC): 5 V for FPV camera
• Configuration Protocol: TBS SmartAudio
• Antenna Connector: MMCX
• Video Format: CVBS
• Dimensions: 38 × 36.5 × 7.2 mm
• Mounting Pattern: 30.5 × 30.5 mm
• Net Weight: 11 g (excluding antenna)

Who Is This For?

• Long-range pilots pushing analog video links to multi-kilometer distances where 1 W is no longer enough
• Freestyle builders flying in obstacle-dense environments where RF penetration matters
• 6S and 8S build owners — the 7–36 V input means no extra step-down regulator is needed
• Repair or upgrade swaps — the 30.5 × 30.5 mm 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  (87 mm)
• 2 × Flight controller signal/power cables  (100 mm each)

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

Operating Notes

• Always connect an antenna before powering on. Running a high-power VTX without an antenna can permanently damage the output stage.
• Heat management. At 1.2 W and 2.5 W the chassis will get hot. Mount with airflow exposure and avoid extended ground operation at maximum power.
• First-time setup. Match band and channel to your goggles or ground-station receiver. The blue LED indicates the band; green LEDs C1 / C2 / C3 indicate the channel; the red LED (P) shows the power level by flash count (1–4).
• Default to 25 mW for bench checks before raising to flight power.

Frequently Asked Questions

Q: Does this VTX work with Betaflight OSD power control?
A: Yes. The unit speaks TBS SmartAudio over a single UART TX pad on your flight controller. Once wired and enabled in Betaflight or INAV, you can switch band, channel, and power from the OSD without landing the model.

Q: Can I power it directly from a 6S or 8S battery?
A: Yes. Input range is 7–36 V, so 2S (≈7.4 V) through 8S (≈33.6 V fully charged) packs feed it directly. For 8S HV LiPo where full charge may exceed 36 V, use a standard (non-HV) 8S pack or add a step-down regulator.

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

Q: Is the LOW band legal in my country?
A: The LOW band (5362–5621 MHz) overlaps with 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, F (FS/IRC) band, or specific A / B / E band channels.

Q: Does it have a built-in microphone?
A: No. The VT5804 transmits CVBS video only. For on-aircraft audio, use an FPV camera with an integrated microphone, or add an external microphone module between the camera and VTX.

Q: Does it support IRC Tramp protocol?
A: No — TBS SmartAudio only. SmartAudio is natively supported across all current Betaflight and INAV firmware versions.

Compliance & Legal

5.8 GHz transmitters operating above 25 mW require an amateur radio license or equivalent authorization in many jurisdictions, including the United States (FCC Part 97 / Part 15) and Canada (ISED rules). 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. It is not intended for unauthorized surveillance, signal interference, or any use that violates applicable law.