Mainly used for detecting frequency
Parameters of transmitter
PC: Transmitter center frequency(8200+-50Hz)
Adjusting R15 Potentiometer can change this parameter.
PS: The main frequency signal of transmitter (150,160,170,180Hz), factory setting is 180Hz.
Not connecting synchronized wires in order to avoid same frequency interference.
Transmitter s scan width (1000+-50Hz)
Factory setting is usually arround 950Hz , when it is the wrong.
Frequency of this parameter can be changed.Aadjusting R14 will change the parameter