The 3BT-800/1000-1S from Lorch Microwave is a Tunable Filter with Frequency 800 MHz to 1 GHz, Bandwidth 2 MHz, Input Power 50 W, Insertion Loss 1.25 dB. Tags: Module with Connectors, Mechanically Controlled, Digitally Controlled. More details for 3BT-800/1000-1S can be seen below.