The PE11S3903 from Pasternack Enterprises Inc is a Frequency Synthesizer with Frequency 10 to 20 GHz, Step Size 1 to 200 MHz, Output Power 18 dBm, Harmonics -60 to -15 dBc, Current 500 mA. Tags: Module with Connectors, PLL Frequency Synthesizer. More details for PE11S3903 can be seen below.