ATTEN ATF20B Signal Function Waveform Generator DDS 100MSa/s 20MHZ Direct Digital Synthesis(DDS) technology, 2 independent output channels 3.5-inch TFT LCD display Multiple modulation functions: FM, FSK, ASK, PSK 32 kinds of standard or build-in fixed waveforms Optional configurations: RS232 interface, Frequency Counter, Power Amplifier