Variometer for a model airplane, output signal of the super regenerative detector of the receiver/ground station.
Visible are the amplitude modulated tone pulses of the 200 MHz transmitter which is positioned in the airplane.
The output signal of the detector is further processed by a audio low pass filter and amplifier.
![](https://i.ytimg.com/vi/37lwi7KyKG8/mqdefault.jpg)