The ECRA511R2C40B from ECHO Microwave is a Band Stop Filter with Stopband Frequency 510 to 512 MHz, Bandwidth 2 MHz, Insertion Loss 1.0 dB ( DC-480MHz, 542-1000MHz, 1.5 dB ( 480-490MHz, 532-542MHz), Rejection 40 dB. Tags: Module with Connectors, Ceramic Filter. More details for ECRA511R2C40B can be seen below.