Review: Oscar’s Backpack VTX (OBVTX)

I am working with AKK on a new VTX – the OBVTX (Oscar’s Backpack VTX). It has some unique features and can be mounted on the back of a micro FPV camera, hence the name “backpack”.

Buyer’s Guide: How to choose VTX?

Update (23 Sep 2018) – Problem with Standoffs

There is an issue with the supplied standoffs – they are too big to fit the Runcam cameras. I brought up the issue with AKK before the official release, but they released it anyway without actually addressing the issue.

I am truly sorry for those who are affected by this problem. I have asked AKK for a solution and how to compensate those who are affected. If you want to buy this VTX and intend to mount it behind the FPV camera, please hold off for now. I will update again when the issue is resolved.

What’s Special about the OBVTX?

I am always searching for the ideal VTX, there are some really good options on the market, but something is missing. I told AKK about my “ideal VTX” and they decided to make a product based on the features and specs I want.

I have been testing and helping AKK to develop the OBVTX for over 4 months, and I cannot wait to share it with you guys.

The OBVTX is not the first VTX that can be mounted on the back of a camera, but there are something unique about it.

TX200U with fragile IPEX connector

Features and Specs

  • VTX Control using SmartAudio
  • Built-in Mic
  • MMCX Connector
  • 5V Input
  • 25mW and 200mW Switchable Power
  • Pitmode
  • Solder pads
  • 19x19mm
  • 2.8g

The unit I have is just a prototype, it doesn’t reflect the the build quality in the final version.

There are two holes for mounting on the back of a micro FPV camera with screws and 3mm standoffs provided. Because of the tiny form factor, you can also mount it anywhere in the mini quad you see fit :)

The mounting holes are perfectly compatible with Runcam’s cameras, but because Foxeer’s have slightly smaller mounting pattern, you might have to push the standoffs inward to get it to fit. (though I need to verify when I get the final version)

Due to the limited space, AKK is using the same LED indicator design as their Nano2, which I personally find quite confusing when changing settings. But if you are only using SmartAudio it’s not a problem at all.

It has a robust MMCX connector, and a built-in microphone for audio. At first AKK told me it was impossible to fit a Mic in there, but they managed it in the end so kudo to them! We also spent a few weeks on audio quality and it has been improved considerably from the first prototype.

I used the OBVTX when I was testing the Rapidfire, take a look at the performance.

Further Testing

I haven’t even got the production version myself (only prototypes). But I will test this VTX like I normally do when it arrives.

Where to Buy?

The Oscar’s Backpack VTX will be available end of August, you can pre-order it now from AKK.


13 thoughts on “Review: Oscar’s Backpack VTX (OBVTX)

  1. Javier Alonso

    good, also happens to me the same I try to mount it in a runcam micro sparrow pro2 and it does not leave me, I have sent mail to akk to see what solution they propose me, with what they tell me I am telling you, greetings to all. and you are a crack hahaha

  2. Tim Ware

    Was there ever a solution to the stand offs? I just bought one from RDQ, and of course the standoff threads are way too big for any micros I have (runcam, caddx, foxeer).

    1. Oscar Post author

      I am really sorry, AKK kept promising but I still don’t see a solution. Being thousands of miles away, there is very little i can do apart from warning people on my blog and keep sending them emails…
      Just to be clear, I am not making any money off this product so far.

  3. E-Bone

    Hi Oscar,
    This VTX is great; however could you try if you get a chance for a second revision to make one with the connector coming out the bottom or an L connector facing back?
    For pods you cant use the backback because of the height once you attach antenna.
    In order to allow this vtx to fit my builds I just wrapped them in heat shrink and stuff them in the pod, it would be great to secure them to the camera as intended.
    Also is it possible to upgrade the firmware so you dont have to use legacy tbs sa?

    1. Oscar Post author

      Thanks for your feedback! It’s not the easiest to work with Chinese manufacturers when it comes to products :) I highly doubt there will be a V2.
      But as for what we have, try to get a right angle adapter/pigtail i think that might fix the problem you have :)
      I don’t get your second point about smartaudio, what’s wrong with it?

  4. Ben B

    I bought several of these when I found out about them. Without smart audio connected, is there a way to have it not boot up into pit mode? Mine always starts up with the green power level LED flashing. If I connect to smart audio, go into the config screen and change from race to free and set it, then it will boot on the respective power level e.g. green lit solid for 25mw. I’m running a matek f411 mini with BF 3.5.1 RDQ AKK fix (or something like that). Not sure if the special firmware is even necessary, it just seemed like the right thing to do at the time.

    1. wade

      I have an answer. The standoffs see to have a larger diameter thread than those on my foxeer micro preditor. So I couldn’t get it to fit

  5. Ched

    Looks good but any chance of it coming with a 90 degree MMCX to sma pigtail. Reason being that the straight one pictured on the sales page will make the pigtail wire stick out of the side of a small quad build.

    1. Oscar Post author

      Yes i might play with different MMCX locations. At the moment I prefer to put the antenna directly on the VTX. If I am using a pigtail, I am mounting it inside the frame, not behind the camera.


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