The 2590-4 from KR Electronics (A Division of NIC) is a Band Pass Filter with Frequency 70 to 87.2 MHz, Bandwidth 17.2 MHz, Center Frequency 78.6 MHz, Insertion Loss 1 dB, Rejection 50 dB. Tags: Module with Connectors, Lumped Component Filter. More details for 2590-4 can be seen below.
