PDH Microwave System QPSK Modulation; Low power consumption and high gain; Frequency Agility and easy Tuning on site. Main Feature-Frequency Range: 7/8GHz,13 GHz,15 GHz,18 GHz,23 GHz-Interface: 4E1, 8E1,16E1,E3,DS3,10/100M, ASI at 32Mb/s-Modular Design, high performance and reliability-Convolutional Interleaver, Punctured convolutional encoding-RS encoding, QPSK Modulation-Low power consumption ...