本音响维修手册为电子版,SHURE 舒尔 LX4分集接收机维修手册 共36页........Squelch comparators U3A and U3C compare a dc level from the user squelch control, R66, to the dc noise level signals coming from each diversitychannel. When the noise level in both channels exceeds a preset level, the audio output of the receiver is squelched. Comparator U4A provides additional signal attenuation in the squelched state by shutting off compander U9B
