The SLSM5-28 from Luff Research, an Ironwave Technologies Company is a Frequency Synthesizer with Frequency 2 to 8 GHz, Step Size 1 kHz, Reference Frequency 10 MHz, Output Power 13 to 15 dBm, Output Power Variation ±3 dB. Tags: Module with Connectors, PLL Frequency Synthesizer. More details for SLSM5-28 can be seen below.