Lrl from Italy

[FrancoItaly]

Originally Posted by Pahom

Good afternoon Franco! Reading about a new project at 20 MHz, you constantly repeat that the waveform at the output of the generator should be DISTORTED as much as possible. Is this so or is it a translation error?

It is not an error, a distorted signal means that it contains harmonics of higher frequency, in our case: fundamental = 20Mhz, second harmonic = 40Mhz, third = 60Mhz, fourth = 80Mhz, fifth = 100 Mhz, always with decreasing amplitude. The L1 / C10 resonant circuit is tuned to one of these harmonics (I think 80 Mhz or 100 Mhz) and this makes the sensor stage more sensitive.