4.2W FPV System 5.8GHz 48CH FPV Transmitter VTX with B19 1/3" CMOS 1500TVL FPV Camera 2.1mm Lens and Dual Cooling Fan for FPV Racing Drones
Description
The Signal No Wall Can Stop Standard VTXs fade when the path gets tough. Low-rise buildings, dense woods, rockyy canyons—these are signal killers. This unit pushes up to a monstrous 4200mW (4.2W) of clean RF power on the 5.8GHz band. That' s not a typoo. It' s raw, FAA-unfriendly, long-range penetration that keeps your video locked when lesser transmitters glitch to static. Selectable four-gear power (200/500/1000/4200mW) lets you dial back to sip power on the bench, or go full-throttle when the flight demands it. Cool Under Pressure Generating 4.2W of RF creates serious heat. Left unchecked, that heat cooks VTXs into thermal shutdown mid-flight. We solved this with a dual-fan active cooling array and a massive dedicated heat sink. But the real genius is the smart temperature detection system: if the core temp ever pushes into dangerous territory, a blue indicator light extinguishes and the VTX automatically downshifts one power level to protect itself. No blackouts. No meltdowns. Just intelligent, aggressive thermal management that keeps your video alive. Wide Voltage, Clean Power Take power straight from your flight pack. The 7-36V (2S-8S) input range supports everything from tiny 3-inch cinewhoops to massive X-Class beasts. A clean 5V/200mA output rail is built in, ready to power your FPV camera directly—no separate BEC, no extra wiring, no added weight. Keep your build tight and your installation simple. Tune It Your Way Forget struggling with a single physical button buried inside a framee. This VTX supports full SmartAudio protocol—wirelessly configure channels, bands, and power levels directly through your Betaflight OSD or FC UART. Prefer the old-school method? The onboard button still gives you direct access to all 48 channels across 6 frequency bands (A/B/C/D/E/R) for manual setup. Features - EXTREME 4.2W PENETRATION: Four selectable power levels—200mW / 500mW / 1000mW / 4200mW. Navigate concrete jungles, dense forests, and deep canyons without breakup. - DUAL-FAN ACTIVE COOLING: Twin integrated cooling fans paired with a large aluminum heat sink rapidly evacuate heat, preventing thermal throttling on the bench and in-flight. - INTELLIGENT OVERHEAT PROTECTION: Built-in temperature sensor with visual LED indicator. Blue light extinguishes and power auto-downshifts one level when temperatures exceed safe limits—no sudden blackouts. - WIDE 7-36V INPUT: Direct connection to 2S-8S lithium packs. No external BEC or voltage regulator required for the VTX itself. - 5V/200MA CAMERA OUTPUT: Integrated clean power rail to directly supply your FPV camera. Eliminates the need for a separate voltage step-down. - SMART AUDIO + BUTTON CONTROL: Fully compatible with SmartAudio for remote channel/power configuration via FC OSD. Physical button backup for direct manual control. - 48 CHANNELS, 6 BANDS: Supports standard A, B, C, D, E, and R bands. Full coverage from 5362MHz to 5945MHz. Find a clear frequency in any environment.
Specification:
| Brand | SLONWAKE |
| Name: | 4.2W VTX Transmitter |
| Frequency band: | 5.8G 48CH |
| Output power levels: | 200mW/500mW/1000mW/4200mW adjustable |
| TBS | 2.1 |
| Input voltage: | 7–36V(2–6S) |
| Interface: | SMA Antenna Connector |
| Connectting cable | 1.27*7pin Paired with connecting cables |
| Cooling: | Dual fans plus heat sink with temperature protection |
| Size: | 50x25x23mm |
| Note |
- This device may require a valid amateur radio license to operate legally in your country. Please check local regulations before transmitting at full power. -The reverse connection of input and output will directly cause the transmission to burn out. Please check it before wiring |
| Brand | SLONWAKE |
| Model: | MINI B19 FPV camera |
| Image sensor: | 1/3" CMOS |
| Horizontal resolution: | 1500TVL |
| Lens: | 2.1 mm |
| Signal system: | PAL/NTSC (OSD adjustable) |
| S/N ratio: | ≥60 dB (AGC off) |
| Electronic shutter speed: | PAL 1/50–1/100,000 s; NTSC 1/60–1/100,000 s |
| Auto gain control (AGC): | Low / Middle / High |
| Backlight compensation (BLC): | Yes |
| Minimum illumination: | 0.001 lux (F1.2) |
| WDR: | Digital WDR (D‑WDR) |
| DNR: | 3DNR (3D noise reduction) |
| Day/Night: | Auto / Color / B&W |
| Power: | DC 5–30 V |
| Net weight: | 6.0 g |
| Dimensions: | 19 × 19 × 19 mm |
| Power | Support 2-6S Power(1S=3.7V) |
Frequency Chart
| Band | CH1 | CH2 | CH3 | CH4 | CH5 | CH6 | CH7 | CH8 |
|---|---|---|---|---|---|---|---|---|
| A | 5865M | 5845M | 5825M | 5805M | 5785M | 5765M | 5745M | 5725M |
| B | 5733M | 5752M | 5771M | 5790M | 5809M | 5828M | 5847M | 5866M |
| C | 5705M | 5685M | 5665M | 5645M | 5885M | 5905M | 5925M | 5945M |
| D | 5740M | 5760M | 5780M | 5800M | 5820M | 5840M | 5860M | 5880M |
| E | 5362M | 5399M | 5436M | 5473M | 5510M | 5547M | 5584M | 5621M |
| R | 5658M | 5695M | 5732M | 5769M | 5806M | 5843M | 5880M | 5917M |
Interface description
| Red Linee: | 7-36V In |
| Black Line: | GND In |
| YelloW Line: | Viedo in |
| Green: | OSD(SmartAudio) |
| White Line: | Audio |
| Blue Line: | GND Out |
| Orange Line: | 5V Out |
Simple Setup. Total Control.
Configure channels, bands, and power levels in seconds using the intuitive onboard button and dual LED indicator system. No OSD? No problem.
* Pit Mode (Race-Ready Safety)
Entering Pit Mode limits transmission range to just 1-2 meters, keeping your signal off other pilots' feeds during race events or bench testing.
| How to toggle: | Press the button twice rapidly. |
| Indication: | Both Red and Blue LEDs flash continuously = Pit Mode active. |
| Normal Mode: | Both Red and Blue LEDs solid on = Full transmission power restored. |
| Racers love this: | power up, set your channel, enable Pit Mode, and wait for your heat without blasting everyone else's video. |
* Manual Parameter Configuration (3-Step Process) Follow this simple sequencee to set your Channel, Band, and Power. Each step is confirmed by the Red LED flash count and Blue LED channel/band/power indicator.
| Step | Action | Red LED Signal | What You're Setting | Blue LED Feedback |
| 1 | Long Press until Red LED flashes | 1 Flash | Channel Selection (CH1-CH8) | Press button to cycle. Blue LED flash count = Channel number (1-8) |
| 2 | Long Press again | 2 Flashes | Band Selection (A-R) | Press button to cycle. Blue LED flash count = Band position (1-6 for A-R) |
| 3 | Long Press again | 3 Flashes | Power Level Selection (Pit/200/500/1000/4200mW) | Press button to cycle. Blue LED flash count = Power gear |
Save & Exit: Once all parameters are set, press and hold the button until the Red and Blue LEDs turn solid on. Your configuration is now locked. Pro Tip: If you're using SmartAudio via Betaflight, the button configuration is automatically overridden by your FC. Use the button for standalone bench setups or non-FC builds. Quick Reference LED Status Guide
| LED | Behavior Meaning |
| Red Solid + Blue Solid | Normal Operation (Parameters Saved & Locked) |
| Red Flashing + Blue Flashing | Pit Mode Active (1-2m Range) |
| Red Flash (1x) | Channel Selection Mode |
| Red Flash (2x) | Band Selection Mode |
| Red Flash (3x) | Power Level Selection Mode |
| Blue Light Off | Temperature Protection Active (Power Auto-Downsifted) |
Package included:
1 x 4.2W VTX Transmitter
1 x MINI B19 FPV camera