The PE8738 from Pasternack Enterprises Inc is a Tunable Filter with Frequency 1 to 2 GHz, Bandwidth 10 MHz, Rejection 40 dB @ 400 KHz, Input Power 50 W, Operating Temperature -55 to 85 Degree C. Tags: Benchtop, Module with Connectors, Mechanically Controlled. More details for PE8738 can be seen below.