The 2454 from KR Electronics (A Division of NIC) is a Low Pass RF Filter with Frequency DC to 37 MHz, Stopband Frequency 52.2 MHz, 3 dB Cutoff Frequency 37 MHz, Lower Rejection 60 [email protected] MHz, Upper Rejection 0.5 [email protected] MHz. Tags: Module with Connector. More details for 2454 can be seen below.