GT R249+ GPS

By attackthedefault on Feb 03, 2019

3  812  7

R9MLite using Super 8 antenna
R9MM using dipole with 74mm elements
RSSI sent back to rx from tx according to:
GT R249+
Mamba F405 mini
Gemfan 2540
TBS Unify HV using LHCP Axxi micro antenna
LDARC 1104 5500Kv
Caddx Turtle v1
Wind 15MPH

diff all and logs


Part List


Diatone 2019 GT R249+ 115mm 2.5 Inch FPV Racing Frame Kit Carbon Fiber & Plastic For RC Drone (7 builds)

Flight Controller

MAMBA F405 Mini Betaflight Flight Controller & F25 20A 3-4S DSHOT600 FPV Racing Brushless ESC (40 builds)


4 x LDARC XT1104 5500KV Brushless Motor for ET115 3S RC Mini Quadcopter (2 builds)


4 Pairs Gemfan Flash 2540 2.5x4 2.5 Inch 3-Blade Propeller with 1.5mm Mounting Hole (171 builds)

FPV Camera

Caddx Turtle V2 Micro FPV Camera / 20x20 1080P 60 FPS HD DVR - Black (54 builds)

FPV Transmitter

Team BlackSheep TBS UNIFY PRO 5G8 HV (SMA) Video Transmitter by Team Blacksheep (596 builds)


Lumenier Micro AXII 5.8GHz U.FL FPV Antenna - Choose Your PolarizationLHCP (59 builds)


FrSky 900Mhz R9MM-FC 16CH Long Range Telemetry Receiver S.Port Enabled for RC Drone (43 builds)


Gaoneng GNB 11.1V 650mAh 80C/160C 3S Lipo Battery XT30 Plug for RC Drone

Misc Parts

003 Silicone O-Ring, 70A Durometer, Red, 1/16" ID, 3/16" OD, 1/16" Width (Pack of 100)

Misc Parts

Makerfire GPS Compass Module, Mini FPV GPS Module,M8Q-5883 Ublox SAM-M8Q GPS QMC5883L Compass Module for RC Drone FPV Racing

Misc Parts

Hilitchi 250-Piece [M2] Stainless Steel Hex Socket Button Head Cap Bolts Screws Nuts Assortment Kit (M2)
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duke_vah   Oct 15, 2019  

I wonder how you connected compass to Mamba F405? It does not have I2c port labeled.

attackthedefault   Oct 15, 2019 

i just solder and flipped till it worked but I don't even use it much anymore...

attackthedefault   Oct 15, 2019 

the i2c pads are on the bottom of the board where the white and green wire are connected

duke_vah   Oct 16, 2019 


irmanhilmi   Aug 31, 2019  

I have a similar setup to yours, how do you connect the GPS, assuming that your Unify uses TX3 and Crossfire uses TX6+RX6? Do you simply connect the GPS using TX3+RX3 and assign them on BF? (with Smartaudio on TX3 as well for your Unify)?

attackthedefault   Oct 14, 2019 

sorry for the late replyI used softserial for smartaudio on the ppm pad

irmanhilmi   Oct 15, 2019 

no worries! I sorta figured the answer out awhile back! thanks.

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