This circuit was obtained from an American 1980s documentation. The frequency depends on the crystal and the circuit may be a PNP that reaches the generated frequency.
This is the typical circuit of an FET amplifier stage in the common source configuration. The circuit is...
Pressing and releasing S, the capacitor C1 charges and discharge slowly through the oscillator...
For the 7 to 10 MHz band L1 is formed by 3 turns of 22 to 28 AWG wire in a ferrite core 15 to 20...