The PE8728 from Pasternack Enterprises Inc is a Tunable Filter with Frequency 125 to 250 MHz, Bandwidth 6.25 MHz, Input Power 50 W, Insertion Loss 1.3 dB, Operating Temperature -55 to 85 Degree C. Tags: Benchtop, Module with Connectors, Mechanically Controlled. More details for PE8728 can be seen below.