The Diatone GT-R90 is such a fantastic little beast but I wanted to modify some of the original gear for a little better performance.

First I replaced the OEM dipole VTX antenna with a Lumenier AXII. I wanted to utilize the original antenna mounting option but ultimately end up with an upright antenna. In order to accomplish this I used a heat gun to soften the oem antenna mount and curve it upwards into a more vertical orientation. The Lumenier antenna is also quite a lot thicker so I needed to use a piece of heat shrink tubing to secure the antenna inside the mount. Lastly, I used a sort of 'handcuff' ziptie method to attach the end of the antenna to the GT-R90's antenna mount.

Second, I noticed that my video feed was pretty noisy and I think the voltage/power environment is pretty hostile on this quad. I wanted to add a capacitor for this reason, a 35v 470uf ultra low ESR, but also because the ESC is a BLHeli S which has braking enabled. Originally I mounted the capacitor directly to the ESC board where the battery cable connects. I wasn't thrilled about mounting it there because of how exposed it was in a crash. Instead I opted to mount the capacitor to the XT30 connector and heat shrink it all together as one unit.

During the capacitor install I noticed how small the factory battery connector wire was, I think it's only 20 gauge wire. I decided that I'd like to replace the wire with heavier 16 gauge wire. I could have probably reused the current sensor/XT30 combo but decided instead to just replace the whole connector and with one I had built with a capacitor already integrated.

In the end, the capacitor has helped the video feed slightly but hasn't removed the noise completely; I think I'd like to upgrade the camera in the future. The benefits of the thicker power wires and capacitor is tough to objectively measure but I 'feel' the quad has much stronger punchouts and better direction changes, perhaps improved torque in the mid throttle range too.

I have both 3S and 4S batteries for this quad but mainly use 4S lipos. I really like the Lumenier 500mah LiHV batteries but the Tattu 450mah 4S batteries are significantly lighter by 10 grams. I have tried both the Gemfan Hulky 1940 props and the Avan Micro props. They are both really great props and I think the Gemfan 1940s are better for 4S and the Avan Micros are better for 3S. However, the Avan Micros are significantly quieter so it's a little better for flying around people.