The 2805 from KR Electronics (A Division of NIC) is a Low Pass RF Filter with Frequency DC to 45 MHz, Stopband Frequency 70 MHz, 3 dB Cutoff Frequency 45 MHz, Lower Rejection 30 dB@70 MHz, Upper Rejection 1 dB@70 MHz. Tags: Module with Connector. More details for 2805 can be seen below.