LGII调频立体声广播发射机由机电部第十研究所研制,该系列发射机被国内许多中小城市及县级广播电台所采用。 LGII发射机的调制器是锁相频率合成式立体声调频器。由于开机后的最初几秒钟内,锁相环在捕捉载波频率的过程中产生的调频射频(此处的调频射频不同于环路锁定后由环外调制信号对压控振荡器调频所产生的调频射频,前者是环路捕捉载频的过程中,鉴相器输出的控制信号力图把压控振荡器的振荡频率牵 LGII FM stereo radio transmitter developed by the tenth Institute of Electrical and Mechanical Services Department, the series transmitters by many small and medium cities and county-level radio stations used. The modulator of the LGII transmitter is a phase-locked frequency synthesizer stereo tuner. Since the first few seconds after power-on, the phase-locked loop generates a frequency modulated radio frequency during the process of capturing the carrier frequency (where the frequency-modulated radio frequency is different from the frequency of the loop-locked modulated frequency-controlled oscillator) FM radio frequency, the former is the process of capturing the carrier frequency loop, the phase detector output control signal trying to control the oscillation frequency of the voltage-controlled oscillator