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. (Here is the VTXTable for it)

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.

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

  1. Ruben van Eupen

    For everyone having problems on bf 4.2 –> lower the baud rate, it solved the issue for me… somehow…

  2. Ruben van Eupen

    Come on Oscar, why don’t you mention the flawed tramp protocol on the first line of your review? Same for the rush vtx. I got fucked over on that one too.

  3. Ruben van Eupen

    Eachine nano vtx – irc tramp protocol not working

    – wire is correct from rx on vtx to tx on fc
    – ports tab to irc tramp
    – vtx tables setup according to oscar liang’s file

    I can set it in the menu, but vtx does not respond… .

  4. Andrew Kostiw

    HI just got this VTX and have not been able to get OSD to display in goggles. Using Betaflight I am able to change vtx settings but cannot access setting via OSD in goggles. Has anyone had any success with this? I have F4 Betafpv aio board.

  5. tomstoms

    Everyone who has problems with the eachine nano and the tramp protocol, should try to compile betaflight with some workarounds added to the source files…

  6. Nelson

    does anybody know how to workarround the inability to use this vtx with tramp protocol on a f4 fc? it doesnt work nor via uart tx or any softserial…

  7. Reinhard Plietsch

    I had problems of Tramp protocol NOT being recognized in the very beginning as well.

    Solution for me: Configure VTX table (as per BF instructions), but make sure the bands are configured as “non-factory”. Mostly they are pre-configured as ‘factory’ for Smartaudio which is the more common alternative to Tramp.

    Works like a charm now!

  8. Aaron Sommers

    I cannot get smartaudio working either. I’m in IRC Tramp in softserial tx1 and cannot change a thing. Should I try different baud rates?
    I’m using it through a Matek f411-wse and firmware f411se RC2.3 in iNav.

    Any help would be appreciated.

  9. Raoul

    I bought this vtx to put it on a RC car. So I don’t have any FC settings available in betaflight. When I select the power (long press 6 seconds then short press to select it) I always have the same poor signal, loosing signal after walking only few meters (1, 2, 3 or 4 flashs (25mw, 100mw, 200mw, 400mw).
    That makes me think I’m in pitmode in reality (there is no “zero flash” so I assume I can’t go into or exit pitmode just by pressing the button for 6 seconds then selecting the power).
    Has anyone an idea on how I could exit pitmode only by pressing the button one way ? There’s nothing in the manual and the only thing I found on the net was to set it with betaflight which I can’t do.
    Because I’m quite sad not being able to use this vtx on my car :/
    Have a nice day everybody :)

  10. 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?

  11. 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.

  12. 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.

  13. 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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