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Telemetry Radios can be used to provide a wireless MAVLink connection between a ground control station like QGroundControl and a vehicle running PX4.
This makes it possible to tune parameters while a vehicle is in flight, inspect telemetry in real-time, change a mission on the fly, etc.

How it works:

Connects Mission Planner to an autopilot in order to receive telemetry and control the vehicle.

Through COM ports, CAN ports, UDP or TCP connection,


Reading posts about configuration problems with here link this was a recommendation

go the simple rout of standard tx/rx with Sik radios and a hd video downlink, all as separate hardware and get things working as it should.




Other telemetry methods:

SmartPort (S.Port) telemetry

FrSky telemetry

HoTT telemetry

LightTelemetry (LTM)

Cellular telemetry via text messages

Ibus telemetry






This topic was modified 6 months ago 5 times by admin

Member Admin
Joined: 10 months ago
Posts: 132
Topic starter  

Lets approach this learning objective as a fun experience. Instead of frustration from the receiver not binging or blinking lights of the wrong color or no data transmission

lets first try to get an understanding of all the code words and identifiers. 

Part of the learning experience in this catagory is clouded because of older prorocols and technologies

If we focus on the ones we are using and the process to complete a handshake and data transmission

one of our recievers is FrSky , an XSR   We chose this because it allows for releying additional information to the tx16s.


The FrSky info: FrySky Telemetry can transmit most of the more useful status information from PX4. S-Port and D-Port receivers transmit different sets of messages

s-port (new) 

d-port. (old)


Smart Port (s.port)  (we failed at getting this reciever setup R-SXR)  This might be a good setup but the support sucks and our review of the receiver is it sucks

Smartport is a telemetry system used by newer FrSky transmitters such as the Taranis Q X7, X9D, X9D+, X9E or XJR paired with X-series receivers such as the X4R(SB), X8R, XSR, R-XSR, XSR-M or XSR-E. For older D-series receivers



Our next attempt at setting up a radio control link will be with TBS nano and tx16s, this is for manual control and basic telemetry, our selected telemetry transmission is accomplished with 



Screen Shot 2021 04 24 at 6.07.30 PM


SiK radio (opens new window)is a collection of firmware and tools for telemetry radios.

PX4 is protocol-compatible with radios that use SiK. SiK Radios often come with appropriate connectors/cables allowing them to be directly connected to Pixhawk Series controllers (in some cases you may need to obtain an appropriate cable/connector). Typically you will need a pair of devices - one for the vehicle and one for the ground station.


Here is a good one 



 now look at the KORE plug




This post was modified 6 months ago 7 times by admin

Member Admin
Joined: 10 months ago
Posts: 132
Topic starter  

iNAV is a fork of cleanflight with a heavy focus upon GPS features for both airplanes & multirotor models.

iNav is being actively developed and currently supports RTH (Return To Home) with a predefined climb height, position hold, waypoints, "follow-me" and many more features.

A wide variety of inexpensive flight controller boards are supported. F4 & F7 flight control boards are strongly suggested to gain access to the full features of iNav.

Latest release for F1 boards is INAV 1.7.3

iNav has many settings that are different than cleanflight, so while the configurator may look familiar to you, simply restoring settings from an older version of cleanflight won't work & the calibration process is very, very different.


  • Runs on the most popular F4 and F7 flight controllers
  • Outstanding performance out of the box
  • Position Hold, Altitude Hold, Return To Home and Missions
  • Excellent support for fixed wing UAVs: airplanes, flying wings
  • Fully configurable mixer that allows to run any hardware you want: multirotor, fixed wing, rovers, boats and other experimental devices
  • Multiple sensor support: GPS, Pitot tube, sonar, lidar, temperature, ESC with BlHeli_32 telemetry
  • SmartAudio and IRC Tramp VTX support
  • DSHOT and Multishot ESCs
  • Blackbox flight recorder logging
  • On Screen Display (OSD) - both character and pixel style
  • Telemetry: SmartPort, FPort, MAVlink, LTM
  • Multi-color RGB LED Strip support
  • Advanced gyro filtering: Matrix Filter and RPM filter
  • Logic Conditions, Global Functions and Global Variables: you can program INAV with a GUI
  • And many more!
This post was modified 6 months ago by admin

Member Admin
Joined: 10 months ago
Posts: 132
Topic starter  

Lets review the path that has been followed to this point


Holybro telemtry SUCKS.  This has been a complete failure and total waist of several days to get this junk to show up as a com port in windows. 

Plan B   Winner   what a differance in the learning phase. Getting the RFD 900x was the best decision in months, well maybe days. It's sad that people trying to learn a technology have to be stalled by shit made equipment 

because of trying to be cost conscious when in the end it's just waisted time

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