Review: Eachine Nano VTX (Smallest 400mW VTX?)

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Review: Eachine Nano VTX (Smallest 400mW VTX?)

Looking for a video transmitter for your tiny whoop or toothpick micro quad builds? Check out the Eachine Nano VTX – not only it’s the smallest VTX I’ve tested, but also capable of up to 400mW!

New to FPV? Check out my VTX buyer’s guide.

Buy the Eachine Nano VTX from: (It’s very popular, get it now before it goes out of stock)

In the package there are the Nano VTX, dipole antenna and the instruction manual.


  • Selectable Power: 25mW, 100mW, 200mW and 400mW
  • Input Voltage: 5V Only
  • 6 Bands, 48 Channels (ABEFRL)
  • Dimension: 14x15x4mm
  • Weight: 1.5g (without wires and antenna)

The Eachine Nano VTX’s got a good list of features:

  • Push button for settings
  • Supports VTX control (IRC Tramp)
  • Solder pads – no stupid connector
  • U.FL (IPEX) Antenna Connector
  • Supports Pitmode

Due to the limited space, there is no microphone.

And there are only three LED’s there for showing you what channel, band and power setting the VTX is on. As you can probably imagine, it can be very confusing! Staring at the flashing LED’s, then reading the manual, it’s like learning Morse code!

Seriously, if you are getting this VTX, you must setup VTX control so you can change VTX settings via Betaflight OSD. Otherwise you’d be in so much trouble. It’s quite easy to do, simply connect the RX pin on the VTX to a TX pin on your FC, then select “Tramp” under Peripheral for that UART. Here is a detail tutorial on how to setup and use VTX control if you are not sure.

The Eachine Nano VTX only takes 5V, which means you can only power it from your FC, or a dedicated 5V BEC. You cannot power it from 1S or 2S LiPo directly.

It’s a lot smaller when holding it in your hands than in the photos.

The Nano VTX and the Runcam Racer Nano should make a great combo for ultra-light micro quads like the toothpicks or tiny whoops 🙂

Here is the instruction manual:

VTX tested with the ImmersionRC power meter V2. Results are taken roughly 10 seconds after powered on. VTX is cooled down between each measurement.

Raceband R1 R2 R3 R4 R5 R6 R7 R8
25mW 25 23 22 23 26 26 24 24
100mW 130 150
200mW 205 245
400mW 300 330

I am very impressed with the output power performance given the tiny size. It has very accurate output power on 25mW across all Raceband channels.

However do note that the output power can continue to drop if you leave it powered on without proper cooling, which is to be expected for a tiny VTX. This is because it has a such small surface area to let the heat go, and there is no heatsink. But don’t worry, when you are flying, the airflow should cool the VTX down considerably.

When testing 400mW on the bench, the output power dropped close to 200mW within a minute due to the VTX getting hotter. Unless you have extremely good cooling – like adding a heatsink or have the VTX fully exposed to airflow, I’d recommend running only 200mW or lower. If you are using anything higher than 100mW, make sure you don’t bury the VTX in your canopy or stack to avoid overheat.

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