Weide Technology Co,. Ltd

VTX-F9 Video Transmitter
(1.7G~1.9G 8CH 6W)
The VTX-F9 delivers high-output power (6W+) in a compact, lightweight design with low latency and exceptional interference resistance. Its integrated heatsink and active cooling fan ensure stable transmission, while thermal protection safeguards against overheating during extended operation. Supports IRC Tramp protocol for OSD configuration – ideal for FPV drone racing, aerial photography, and outdoor applications.
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1. General Specifications
Parameter Specification Input Voltage DC 7V - 36V (2S - 8S LiPo) Output Voltage 5V ±0.5V (MAX 500mA when input voltage > 7.2V) Channels 8 (Programmable: 1680MHz - 1960MHz; single frequency operation) Transmit Power PIT Mode, 25mW, 800mW, 6000mW (6W) Control Protocol IRC Tramp (OSD configuration supported) Modulation FM Frequency Control PLL Frequency Stability ±100 kHz (Typ.) Frequency Precision ±200 kHz (Typ.) S/N Ratio (Fo ±3) >70 dBc Antenna Impedance 50 Ω Antenna Connector SMA (Inner Pin) Video Standard PAL/NTSC Video Input Level 1V ±0.2Vp-p Video Signal Format CVBS Operating Temperature -10°C to +60°C Dimensions (L×W×H) 37 × 37 × 19 mm (excl. SMA connector) Mounting Pattern 30.5 × 30.5 mm (M3 holes) Weight 21.7 g (excl. antenna) ________________________________________
2. Interfaces & Controls
Physical Layout:
![VTX-F9 Interface Diagram]
Top: Heatsink/Fan Assembly | SMA Antenna Port | 5V Fan Connector
Front: Power Button | Power LED | Channel LED | Channel Button
Side: NC | 5V OUT | Video IN | GND | IRC | GND | DC IN
Interface Functions:
Label Function DC IN Positive power input (7-36V DC) GND Power ground / Video ground / Signal ground IRC Serial control port (IRC protocol) VIDEO IN Composite video input (1Vp-p @75Ω) 5V OUT Regulated 5V±0.5V output (MAX 500mA when input >7.2V) NC No connection SMA Antenna output (inner pin) Button Operations:
Button Action Function Power Button Short press Cycle power: 25mW → 800mW → 6W → Repeat Long press (2s) Enable/disable PIT Mode Channel Button Short press Cycle channels: CH1 → CH2 → ... → CH8 → CH1 LED Indicators:

Power LED (Green):


Solid: PIT Mode active


1 Flash: 25mW


2 Flashes: 800mW


3 Flashes: 6000mW (6W)


Channel LED (Blue):
*Number of flashes = Channel number (1-8)*

Channel Frequencies:
CH LED Blinks Frequency 1 1 1680 MHz 2 2 1720 MHz 3 3 1760 MHz 4 4 1800 MHz 5 5 1840 MHz 6 6 1880 MHz 7 7 1920 MHz 8 8 1960 MHz ________________________________________
3. Thermal Protection
Automatic power reduction activates when temperature exceeds 100°C:

Drops one power level (e.g., 6W → 800mW)


If still >100°C, drops another level (800mW → 25mW)


Maintains minimum power (25mW) until cooled
Full power restores when temperature drops below 95°C.

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4. OSD Configuration via IRC Protocol
Power Control:
OSD options: 25 / 800 / 6000 → Corresponds to 25mW / 800mW / 6W
Hardware Setup:

Connect VTX's IRC pin to flight controller's unused UART TX pin


Ground station configuration:


Ports Tab → Select UART → Set Peripherals to IRC Tramp

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5. Critical Usage Warnings
⚠️ POWER & ANTENNA SAFETY

ALWAYS install antenna BEFORE powering on.


Consequence: Unmatched/unconnected antennas WILL damage the PA.


Input Voltage: Strictly 7-36V DC (2S-8S).


5V OUTPUT LIMITS:


Max 500mA current


DO NOT power cameras exceeding 500mA


SHORT CIRCUIT RISK: Never connect 5V OUT to DC IN or battery.

⚠️ OPERATIONAL PRECAUTIONS

Match TX/RX frequencies exactly (see channel table).


Case becomes extremely hot during operation: Avoid contact.


Case removal for weight reduction:


Allowed but increases thermal throttling risk.