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.

Where to Buy?

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.

Features and Specs


  • 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

Closer Look at the Eachine Nano VTX

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:

Power Testing

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 quickly as the VTX getting hotter. I personally would not use 400mW unless there is extremely good cooling – like adding a heatsink or have the VTX fully exposed to airflow. If you are using anything higher than 100mW, make sure you don’t bury the VTX in your canopy or stack to avoid overheat.

11 thoughts on “Review: Eachine Nano VTX (Smallest 400mW VTX?)

  1. Utkarsh Verma

    I got this VTx recently, I connected it to a cheap camera. I dont get any video on the receiver, the red light flashes and stops for 3 seconds (25 mW). I connected the same camera to another VTx and it shows fine video. Does it need the Rx connected always or it can be left out not connected? Is there something I am missing?

  2. Douglas King

    I now have 5 of these and 3 of them DO NOT ACCEPT Tramp commands at all. Just like the commenter above saying “I don’t detect the vtx * —- —– —– and I’m not able to change bands and channels”.

    This is piss poor quality from Eachine, but I guess it’s to be expected.

  3. Jeremy Chotto

    For the tramp protocol to work instead of going to confirm yes or no select the channel and band then go to save exit. That is the only way I can get the tramp protocol to work.

  4. Alvaro Valles Arasanz

    Hello, excellent review, regarding the configuration of the smart audio, I have carefully followed the manual, TX1 of the FC to Rx1 of the VTX, and BF configured in the UART1 as IRC Tramp, once done, it works correctly to activate and deactivate pit mode, but I don’t detect the vtx * —- —– —– and I’m not able to change bands and channels, what could be the problem?


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