GEPRC Mark4 Analog 4S

By Cap. Zaspan on Nov 04, 2022

5  158  0

This is my budget analog 4S build.
I am FPV begginer and this is my 2nd build (first build was Tyro 119 following Bardwell's build playlist)
but the first one where I chose all the components myself.
Note: The frame, VTX and camera are purchase from a friend so I saved a few bucks compared to total amount in part section below.

The frame is Geprc Mark4. There is enough room to easily build in all the components.

FC+ESC Stack is Tmotor F411 lite. It is a newish product with budget price and it is flashed with BTF 4.3.1 FW.
It is F411 processor and because of that it has 2 UARTS + additional one, soft serial opens after uploading Tmotor file from their webpage into BTF.
But this is a basic build so a few UARTs are enough.

ESC is BLHeli S so I flashed it whit BlueJay FW, set up DSHOT 300, enabled Bidirectional DShot and enabled RPM filtering.
I mentioned that I am begginer so no tuning done yet and all PIDs are left on default, with values for Gyro update 3.20 kHz and 1.6kHz PID loop.
Alt Tag
Alt Tag

I am using 4S 1500mAh battery so for the motors I choose Tmotor Velox 2207 2450kv.

Reciver is FrSky R-XSR and I had a problem with Telemetry I couldn't resolve.
Reciver is bind but couldn't make Telemetry on my QX7 to work. I tried all the combinations of reciver FW and Rx-FC connections.
Fport FW, SBUS FW, SBUS, TX, Soft serial connection to FC but no success so I give up on Telemetry.
Note: In the future will upgrade reciver to ELRS and will flash my Taranis QX7 radio whit EdgeTX.

During maiden flight analog VTX setup test on range and penetration between trees were above my expetations.
The image quality is very good from Baby ratel camera, and Zeus VTX is a little beast.
Set it up on medium power, 200mW, and had very little interfirence flying behind the trees.

Photos

Part List

Frame

Geprc MARK4 225mm 5 Inch / 260mm 6 Inch / 295mm 7 Inch Frame Kit for RC Drone FPV Racing (29 builds)
Banggood.com
$51.90

Flight Controller

T-Motor Velox F411 Lite FC + V45A Lite ESC 30x30 Stack/Combo
Pyrodrone.com
$76.90

Motors

4 x T-Motor VELOX V2 2207 2550Kv Motor (2 builds)
Pyrodrone.com
$55.96

Propellers

Gemfan Hurricane 51477 3 Blade Prop (10 builds)
Pyrodrone.com
$2.99

FPV Camera

Caddx Baby Ratel 2 Nano Low Latency FPV Camera (14 builds)
Pyrodrone.com
$25.90

FPV Transmitter

HGLRC Zeus Nano 350mW 16mm/20mm/25.5mm VTX (32 builds)
Pyrodrone.com
$14.99

Antenna

TRUERC OCP 5.8 SMA ANTENNA RHCP (3 builds)
Pyrodrone.com
$12.99

Receiver

FrSky R-XSR S.Bus/CPPM 8/16 Channel Micro Receiver (28 builds)
Pyrodrone.com
$21.99

Batteries

CNHL Black Series 1500mAh 14.8V 4S 100C Lipo Battery (2 builds)
Pyrodrone.com
$17.49

Radio

FrSky ACCST Taranis Q X7 Transmitter 2.4G 16CH Mode 2 White Black International Version for RC Drone (263 builds)
Banggood.com
$139.99

Goggles

Skyzone SKY03O Oled /SKY03S 5.8GHz 48CH Diversity FPV Goggles Support OSD DVR HDMI With Head Tracker Fan LED For RC Racing Drone (47 builds)
Banggood.com
$399.90

HD Camera

RunCam 5 Orange 12MP 4:3 145°FOV 56g Ultra-light 4K HD FPV Camera for RC Drone (20 builds)
Banggood.com
$102.49

Misc Parts

Pyrodrone 250mm Kevlar Stitch Battery Strap Metal Buckle
Pyrodrone.com
$1.99

Video Receiver

Walksnail Avatar VRX Kit - Choose Version
Pyrodrone.com
$219.00

Radio Module

NAMIMNO ELRS 2.4GHz Flash Micro TX Module (2 builds)
Pyrodrone.com
$49.99

Battery Charger

iSDT 608AC Smart Battery Charger AC 50W DC 200W 8A w/ Detachable Power Supply
Pyrodrone.com
$69.99

Accessories

LANTIAN 24V 16.6A 400W Power Supply Adapter Upgrade Version for ISDT Q6 Nano ToolkitRC M8 Charger
Banggood.com
$33.99

Accessories

XT60 Plug Parallel Charging Board For ISDT Q8 D2 Q6 T6 Lite ToolkitRC M6 M8 Charger (11 builds)
Banggood.com
$18.99
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