The ECRA728F745D30BW from ECHO Microwave is a Band Stop Filter with Stopband Frequency 728 to 745 MHz, Bandwidth 17 MHz, Insertion Loss 3.0 dB ( 747-749MHz), 2.0 dB ( 749-2300MHz), Rejection 30 dB. Tags: Module with Connectors, Ceramic Filter. More details for ECRA728F745D30BW can be seen below.