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Telemetry

Telemetry is a system that trasmits system health and performance data from the RC aircraft to the ground. Telemetric data is for exemple battery voltage, current intensity, altitude, distance from pilot, speed, temperature of motors,... The telemetry is a must in RC Aerial photography and videography, both in line of sight (LOS) or First Person View (FPV) type of flying. This is mailnly for safety reasons and for compliance to local regulations. The same kind of information can be transmitted with the video image transmission through the OSD systems.

 

I have compared 3 telemtry systems provided by 3 different Radio manufacturers, Graupner Hott, Futaba Fasstest and Spektrum.

 

Here are the pros and cons:

 

 

 Spektrum / DX8

Pros

- Gives information on lost frames (indication of signal strenght)                   

Cons

- Telemetry module separated from receiver

- No voice alarms (only beeps and vibration)

- No individual lipo cell monitoring


 

 Graupner / MX20

Pros      

- Gives information on signal strenght

- Telemetry is embedded in the receiver / no need for two modules

- Has voice alarm (important for fpv when eyes need to be focussed on video downlink.

- Many additional probes are available such as baro altimeter, current, GPS,...

Cons

- I had a very poor range only of about 400 meters making this technology totally useless for me. Maybe I got a faulty model but the advertisement claiming up to 4 km range is a lie.

- No individual lipo cell monitoring 


 

 Futaba / T8FG and Robbe telemetry box

Pros

- Receiver provided Voltage atelemetry data

- Many additional probes are available such as baro altimeter, GPS    

- Has voice alarm (important for fpv when eyes need to be focussed on video downlink.       

- Telemetry box has speaker, so headset is not needed

- Alternatively telemtry box can be replaced by receiver for displaying telemetry data on mobile devices such as phones or tablets.

- The RC range is very good. I tested about 1.5 km without reaching the loss of the RC signal.

Cons

- Although advertisment claims for transmission of signal strenght, current telemtry box software does not display it and no alrms can be set

- No individual lipo cell monitoring

 

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