The MCFUM-1BL-45MHz-A from Dynamic Engineers is a Band Pass Filter with Frequency 44.9925 to 45.0075 MHz, Bandwidth 15 KHz, Center Frequency 45 MHz, Insertion Loss 3 dB, Rejection 30 +/- 50 KHz max to 80 dB +/- 300 KHz to +/- 1000 KHz. Tags: Through Hole, Crystal Filter. More details for MCFUM-1BL-45MHz-A can be seen below.