The FMSN3900 from Fairview Microwave is a Frequency Synthesizer with Frequency 35 MHz to 4.4 GHz, Step Size 2.441 KHz, Reference Frequency 10 to 100 MHz, Output Power 10 dBm, Input Power 15 dBm. Tags: Module with Connectors, PLL Frequency Synthesizer. More details for FMSN3900 can be seen below.