Furaxa announces frequency synthesizers with automatic sweep and modulation capabilities. The Synth300S and Synth300D are single- and dual-channel Direct Digital Synthesizers (DDS) PCI cards with one or two independent DDSs. Each is separately programmable for frequencies between 1 and 300 MHz increments of ~0.223 Hz. In addition to single or dual tone generation (500 mV into 50Ω), the series can be used to generate frequency swept signals with user-defined sweep rates. Also, by utilizing the four independent user-defined frequency/phase profiles associated with each synthesizer, frequency, and/or phase modulated waveforms (FSK, PSK) can be generated and controlled by software or external hardware. The series is designed for low jitter operation in communications, industrial, military/aerospace, and scientific applications.