F. M. TRANSMITTER EMPLOYING MAGNETICALLY MODULATED FERRIMAGNETIC RESONATOR

摘要

A ferrimagnetic crystal resonator is employed as the frequency determinative element of a radio frequency oscillator. The ferrimagnetic crystal is disposed in the gap of a magnet and the magnetic field is modulated in intensity in accordance with an audio AM signal to be impressed on the carrier. The audio AM modulation of the magnetic field of the magnet is converted into frequency modulation of the carrier frequency of the ferrimagnetic crystal controlled oscillator. An internally generated stable reference radio frequency signal is compared with a sample of the FM output signal to produce an error signal for correcting the average magnetic field intensity for controlling the average or carrier frequency of the FM transmitter.