The ECS-38SMF45A30 from ECS Inc. International is a Band Pass Filter with Frequency 44.985 to 45.015 MHz, Bandwidth 15 kHz, Center Frequency 45 MHz, Insertion Loss 2.5 dB, Rejection 60 dB. Tags: Surface Mount, Crystal Filter. More details for ECS-38SMF45A30 can be seen below.