The HP 8656 A Synthesizer Signal Generator provides frequency coverage from 0,1 to 990 MHz with full HP-IB programmability. Frequency resolution of 100 Hz or 250 Hz. Simultaneous and mixed modulation (AM/AM, FM/FM, and AM/FM) from internal (1kHz and 400 Hz) and external sources. No manual or other accessories. Self-tests OK. Sold AS IS.