The 2586-30 from KR Electronics (A Division of NIC) is a Low Pass RF Filter with Frequency DC to 30 MHz, Stopband Frequency 60 MHz, 3 dB Cutoff Frequency 30 MHz, Lower Rejection 55 dB@60 MHz, Upper Rejection 0.5 dB@60 MHz. Tags: Module with Connector. More details for 2586-30 can be seen below.