... 250V,1A(delay type) Center frequency 8.2±0.05MHz Scan frequency deviation ±500KHz Modulation frequency 150,160,170,180Hz 2. ... connection is difficult, by changing the transmitter’s modulation frequency 150, 160, 170 and 180Hz, to let each ... 2. Adjust the VR4 clockwise can improve the sensitivity of test, now the green LED DS1, DS2, DS3 may twinkle ... JP1 setting on 2&3. Economical TEC-506 EAS system