The MLFP-20520 from Micro Lambda Wireless, Inc. is a Tunable Filter with Tunable Frequency 500 MHz to 2 GHz, Bandwidth 20 MHz, Rejection 45 dB, Insertion Loss 4 dB, Supply Voltage 20 to 30 Vdc(Heater Voltage). Tags: Module with Connectors, YIG Filter. More details for MLFP-20520 can be seen below.