The 2473-B from KR Electronics (A Division of NIC) is a Band Pass Filter with Frequency 24.9 to 28.8 MHz, Bandwidth 3.95 MHz, Center Frequency 26.9 MHz, Insertion Loss 3 dB, Rejection 60 dB. Tags: Module with Connectors, Lumped Component Filter. More details for 2473-B can be seen below.