Is it AM or FM?

[minigmh]

Hi Friends,
Does it make any sense to ask which technology, Frequency, or Amplitude Modulation is used at the 27MHz frequency? This is for a cheap radio control toy. Maybe there is no "signal wave" added to the carrier wave for this simple toy, and it simply just uses a burst of noise?

 

[KJ6EAD]

Those are usually CB channel 14, so AM. If you have a scanner or CB radio, maybe you can hear the control signals.

 

[trash]

Yep, they're AM with a simple PWM/TDM channel control.
It might sound like noise, but the signal is structured. You can see the waveform on most CRO's.

This is the datasheet for a lot of the micro bit RC cars etc.
https://www.electro-tech-online.com/custompdfs/2012/04/FWWCD13GV525G0X.pdf

These units aren't restricted to any specific kind of modulation and some 27MHz systems do use FM rather than AM.
Or rather they use FSK vs ASK or OOK.

 

[minigmh]

Thanks guys.