The U3510 from Mercury Systems is a Low Pass RF Filter with Frequency 1 to 125 MHz, Stopband Frequency 250 to 2000 MHz / 1227 to 1575 MHz, Insertion Loss 0.5 dB, Rejection 50 to 100 dB, Upper Rejection 50 to 100 dB @250 to 1575 MHz. Tags: Module with Connector. More details for U3510 can be seen below.