The MCFUM-1CH-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 35 dB@DC ~ 1609.5MHz to 45dB @ 1635 ~ 3500MHz. Tags: Through Hole, Crystal Filter. More details for MCFUM-1CH-45MHz-A can be seen below.